From 25862fdf888ed23207ab51937a43e6f9ad41d805 Mon Sep 17 00:00:00 2001
From: Jean-Noel Rouvignac <jean-noel.rouvignac@forgerock.com>
Date: Mon, 22 Sep 2014 16:23:50 +0000
Subject: [PATCH] OPENDJ-1206 (CR-4393) Create a new ReplicationBackend/ChangelogBackend to support cn=changelog

---
 opendj3-server-dev/src/server/org/opends/server/core/PersistentSearch.java                                            |   36 +
 opendj3-server-dev/src/server/org/opends/server/replication/plugin/LDAPReplicationDomain.java                         |   41 --
 opendj3-server-dev/src/server/org/opends/server/replication/server/changelog/je/ChangeNumberIndexer.java              |    2 
 opendj3-server-dev/tests/unit-tests-testng/src/server/org/opends/server/replication/server/ExternalChangeLogTest.java |   64 ++-
 opendj3-server-dev/src/guitools/org/opends/guitools/controlpanel/util/ReadOnlyConfigFileHandler.java                  |    7 
 opendj3-server-dev/src/server/org/opends/server/replication/server/ReplicationServer.java                             |   97 -----
 opendj3-server-dev/src/server/org/opends/server/replication/server/ECLServerWriter.java                               |    8 
 opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendSearchOperation.java         |  117 ++----
 opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendDeleteOperation.java         |    2 
 opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendModifyDNOperation.java       |    2 
 opendj3-server-dev/src/server/org/opends/server/backends/jeb/BackendImpl.java                                         |    7 
 opendj3-server-dev/src/server/org/opends/server/backends/RootDSEBackend.java                                          |    1 
 opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendModifyOperation.java         |  205 +++++-------
 opendj3-server-dev/src/server/org/opends/server/replication/server/ECLServerHandler.java                              |   43 +-
 opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendWorkflowElement.java         |  107 +-----
 opendj3-server-dev/src/server/org/opends/server/api/Backend.java                                                      |   66 +++
 opendj3-server-dev/src/server/org/opends/server/backends/SchemaBackend.java                                           |    1 
 opendj3-server-dev/src/server/org/opends/server/workflowelement/externalchangelog/ECLSearchOperation.java             |   32 -
 opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendAddOperation.java            |    2 
 opendj3-server-dev/src/server/org/opends/server/workflowelement/externalchangelog/ECLWorkflowElement.java             |   75 ----
 opendj3-server-dev/src/server/org/opends/server/backends/MonitorBackend.java                                          |    4 
 opendj3-server-dev/src/server/org/opends/server/backends/NullBackend.java                                             |    1 
 opendj3-server-dev/src/server/org/opends/server/extensions/ConfigFileHandler.java                                     |    8 
 opendj3-server-dev/src/server/org/opends/server/replication/server/changelog/je/JEChangelogDB.java                    |    3 
 opendj3-server-dev/src/server/org/opends/server/backends/task/TaskBackend.java                                        |    2 
 opendj3-server-dev/src/server/org/opends/server/backends/BackupBackend.java                                           |    1 
 opendj3-server-dev/src/server/org/opends/server/backends/TrustStoreBackend.java                                       |    1 
 27 files changed, 345 insertions(+), 590 deletions(-)

diff --git a/opendj3-server-dev/src/guitools/org/opends/guitools/controlpanel/util/ReadOnlyConfigFileHandler.java b/opendj3-server-dev/src/guitools/org/opends/guitools/controlpanel/util/ReadOnlyConfigFileHandler.java
index 4601365..8b590bf 100644
--- a/opendj3-server-dev/src/guitools/org/opends/guitools/controlpanel/util/ReadOnlyConfigFileHandler.java
+++ b/opendj3-server-dev/src/guitools/org/opends/guitools/controlpanel/util/ReadOnlyConfigFileHandler.java
@@ -90,6 +90,7 @@
   @Override
   public void finalizeConfigHandler()
   {
+    finalizeBackend();
   }
 
   /** {@inheritDoc} */
@@ -291,12 +292,6 @@
 
   /** {@inheritDoc} */
   @Override
-  public void finalizeBackend()
-  {
-  }
-
-  /** {@inheritDoc} */
-  @Override
   public DN[] getBaseDNs()
   {
     return baseDNs;
diff --git a/opendj3-server-dev/src/server/org/opends/server/api/Backend.java b/opendj3-server-dev/src/server/org/opends/server/api/Backend.java
index 70b405c..65bc052 100644
--- a/opendj3-server-dev/src/server/org/opends/server/api/Backend.java
+++ b/opendj3-server-dev/src/server/org/opends/server/api/Backend.java
@@ -29,7 +29,9 @@
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Queue;
 import java.util.Set;
+import java.util.concurrent.ConcurrentLinkedQueue;
 
 import org.forgerock.i18n.LocalizableMessage;
 import org.forgerock.opendj.config.server.ConfigException;
@@ -40,6 +42,8 @@
 import org.opends.server.core.DirectoryServer;
 import org.opends.server.core.ModifyDNOperation;
 import org.opends.server.core.ModifyOperation;
+import org.opends.server.core.PersistentSearch;
+import org.opends.server.core.PersistentSearch.CancellationCallback;
 import org.opends.server.core.SearchOperation;
 import org.opends.server.monitors.BackendMonitor;
 import org.opends.server.types.AttributeType;
@@ -99,6 +103,10 @@
   /** The writability mode for this backend. */
   private WritabilityMode writabilityMode = WritabilityMode.ENABLED;
 
+  /** The set of persistent searches registered with this backend. */
+  private final ConcurrentLinkedQueue<PersistentSearch> persistentSearches =
+      new ConcurrentLinkedQueue<PersistentSearch>();
+
   /**
    * Configure this backend based on the information in the provided
    * configuration.
@@ -166,16 +174,26 @@
   /**
    * Performs any necessary work to finalize this backend, including
    * closing any underlying databases or connections and deregistering
-   * any suffixes that it manages with the Directory Server.  This may
+   * any suffixes that it manages with the Directory Server. This may
    * be called during the Directory Server shutdown process or if a
-   * backend is disabled with the server online.  It must not return
-   * until the backend is closed.
-   * <BR><BR>
-   * This method may not throw any exceptions.  If any problems are
-   * encountered, then they may be logged but the closure should
-   * progress as completely as possible.
+   * backend is disabled with the server online.
+   * It must not return until the backend is closed.
+   * <p>
+   * This method may not throw any exceptions. If any problems are encountered,
+   * then they may be logged but the closure should progress as completely as
+   * possible.
+   * <p>
+   * This method must be called by all overriding methods with
+   * <code>super.finalizeBackend()</code>.
    */
-  public abstract void finalizeBackend();
+  public void finalizeBackend()
+  {
+    for (PersistentSearch psearch : persistentSearches)
+    {
+      psearch.cancel();
+    }
+    persistentSearches.clear();
+  }
 
 
 
@@ -887,7 +905,39 @@
     return backendMonitor;
   }
 
+  /**
+   * Registers the provided persistent search operation with this backend so
+   * that it will be notified of any add, delete, modify, or modify DN
+   * operations that are performed.
+   *
+   * @param persistentSearch
+   *          The persistent search operation to register with this backend
+   */
+  public void registerPersistentSearch(PersistentSearch persistentSearch)
+  {
+    persistentSearches.add(persistentSearch);
 
+    persistentSearch.registerCancellationCallback(new CancellationCallback()
+    {
+      @Override
+      public void persistentSearchCancelled(PersistentSearch psearch)
+      {
+        persistentSearches.remove(psearch);
+      }
+    });
+  }
+
+  /**
+   * Returns the persistent searches currently active against this local
+   * backend.
+   *
+   * @return the list of persistent searches currently active against this local
+   *         backend
+   */
+  public Queue<PersistentSearch> getPersistentSearches()
+  {
+    return persistentSearches;
+  }
 
   /**
    * Sets the backend monitor for this backend.
diff --git a/opendj3-server-dev/src/server/org/opends/server/backends/BackupBackend.java b/opendj3-server-dev/src/server/org/opends/server/backends/BackupBackend.java
index d17cb99..6e4e99f 100644
--- a/opendj3-server-dev/src/server/org/opends/server/backends/BackupBackend.java
+++ b/opendj3-server-dev/src/server/org/opends/server/backends/BackupBackend.java
@@ -201,6 +201,7 @@
   @Override
   public void finalizeBackend()
   {
+    super.finalizeBackend();
     currentConfig.removeBackupChangeListener(this);
 
     try
diff --git a/opendj3-server-dev/src/server/org/opends/server/backends/MonitorBackend.java b/opendj3-server-dev/src/server/org/opends/server/backends/MonitorBackend.java
index 10ef54c..60b9ece 100644
--- a/opendj3-server-dev/src/server/org/opends/server/backends/MonitorBackend.java
+++ b/opendj3-server-dev/src/server/org/opends/server/backends/MonitorBackend.java
@@ -64,7 +64,8 @@
 {
   private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
 
-  /** The set of user-defined attributes that will be included in the base
+  /**
+   * The set of user-defined attributes that will be included in the base
    * monitor entry.
    */
   private ArrayList<Attribute> userDefinedAttributes;
@@ -331,6 +332,7 @@
   @Override
   public void finalizeBackend()
   {
+    super.finalizeBackend();
     currentConfig.removeMonitorChangeListener(this);
     try
     {
diff --git a/opendj3-server-dev/src/server/org/opends/server/backends/NullBackend.java b/opendj3-server-dev/src/server/org/opends/server/backends/NullBackend.java
index ae94001..594c413 100644
--- a/opendj3-server-dev/src/server/org/opends/server/backends/NullBackend.java
+++ b/opendj3-server-dev/src/server/org/opends/server/backends/NullBackend.java
@@ -219,6 +219,7 @@
   @Override
   public synchronized void finalizeBackend()
   {
+    super.finalizeBackend();
     for (DN dn : baseDNs)
     {
       try
diff --git a/opendj3-server-dev/src/server/org/opends/server/backends/RootDSEBackend.java b/opendj3-server-dev/src/server/org/opends/server/backends/RootDSEBackend.java
index 37ea4dd..eecdf96 100644
--- a/opendj3-server-dev/src/server/org/opends/server/backends/RootDSEBackend.java
+++ b/opendj3-server-dev/src/server/org/opends/server/backends/RootDSEBackend.java
@@ -286,6 +286,7 @@
   @Override
   public void finalizeBackend()
   {
+    super.finalizeBackend();
     currentConfig.removeChangeListener(this);
   }
 
diff --git a/opendj3-server-dev/src/server/org/opends/server/backends/SchemaBackend.java b/opendj3-server-dev/src/server/org/opends/server/backends/SchemaBackend.java
index 4c4731b..24a966b 100644
--- a/opendj3-server-dev/src/server/org/opends/server/backends/SchemaBackend.java
+++ b/opendj3-server-dev/src/server/org/opends/server/backends/SchemaBackend.java
@@ -495,6 +495,7 @@
   @Override
   public void finalizeBackend()
   {
+    super.finalizeBackend();
     currentConfig.removeSchemaChangeListener(this);
 
     for (DN baseDN : baseDNs)
diff --git a/opendj3-server-dev/src/server/org/opends/server/backends/TrustStoreBackend.java b/opendj3-server-dev/src/server/org/opends/server/backends/TrustStoreBackend.java
index 95e0184..1bdcf5a 100644
--- a/opendj3-server-dev/src/server/org/opends/server/backends/TrustStoreBackend.java
+++ b/opendj3-server-dev/src/server/org/opends/server/backends/TrustStoreBackend.java
@@ -346,6 +346,7 @@
   @Override
   public void finalizeBackend()
   {
+    super.finalizeBackend();
     configuration.addTrustStoreChangeListener(this);
 
     try
diff --git a/opendj3-server-dev/src/server/org/opends/server/backends/jeb/BackendImpl.java b/opendj3-server-dev/src/server/org/opends/server/backends/jeb/BackendImpl.java
index 462beb6..c36abcb 100644
--- a/opendj3-server-dev/src/server/org/opends/server/backends/jeb/BackendImpl.java
+++ b/opendj3-server-dev/src/server/org/opends/server/backends/jeb/BackendImpl.java
@@ -312,7 +312,7 @@
   @Override
   public void finalizeBackend()
   {
-    // Deregister as a change listener.
+    super.finalizeBackend();
     cfg.removeLocalDBChangeListener(this);
 
     // Deregister our base DNs.
@@ -349,10 +349,7 @@
     }
 
     // Checksum this db environment and register its offline state id/checksum.
-    DirectoryServer.registerOfflineBackendStateID(this.getBackendID(),
-      checksumDbEnv());
-
-    //Deregister the alert generator.
+    DirectoryServer.registerOfflineBackendStateID(getBackendID(), checksumDbEnv());
     DirectoryServer.deregisterAlertGenerator(this);
 
     // Make sure the thread counts are zero for next initialization.
diff --git a/opendj3-server-dev/src/server/org/opends/server/backends/task/TaskBackend.java b/opendj3-server-dev/src/server/org/opends/server/backends/task/TaskBackend.java
index a0e6b5e..46b49a8 100644
--- a/opendj3-server-dev/src/server/org/opends/server/backends/task/TaskBackend.java
+++ b/opendj3-server-dev/src/server/org/opends/server/backends/task/TaskBackend.java
@@ -263,9 +263,9 @@
   @Override
   public void finalizeBackend()
   {
+    super.finalizeBackend();
     currentConfig.removeTaskChangeListener(this);
 
-
     try
     {
       taskScheduler.stopScheduler();
diff --git a/opendj3-server-dev/src/server/org/opends/server/core/PersistentSearch.java b/opendj3-server-dev/src/server/org/opends/server/core/PersistentSearch.java
index 6a69279..585ff0b 100644
--- a/opendj3-server-dev/src/server/org/opends/server/core/PersistentSearch.java
+++ b/opendj3-server-dev/src/server/org/opends/server/core/PersistentSearch.java
@@ -107,10 +107,8 @@
       psearch.isCancelled = true;
 
       // The persistent search can no longer be cancelled.
-      psearch.searchOperation.getClientConnection().deregisterPersistentSearch(
-          psearch);
+      psearch.searchOperation.getClientConnection().deregisterPersistentSearch(psearch);
 
-      //Decrement of psearch count maintained by the server.
       DirectoryServer.deregisterPersistentSearch();
 
       // Notify any cancellation callbacks.
@@ -152,25 +150,33 @@
   /** The reference to the associated search operation. */
   private final SearchOperation searchOperation;
 
-
+  /**
+   * Indicates whether to only return entries that have been updated since the
+   * beginning of the search.
+   */
+  private final boolean changesOnly;
 
   /**
-   * Creates a new persistent search object with the provided
-   * information.
+   * Creates a new persistent search object with the provided information.
    *
    * @param searchOperation
    *          The search operation for this persistent search.
    * @param changeTypes
    *          The change types for which changes should be examined.
+   * @param changesOnly
+   *          whether to only return entries that have been updated since the
+   *          beginning of the search
    * @param returnECs
-   *          Indicates whether to include entry change notification
-   *          controls in search result entries sent to the client.
+   *          Indicates whether to include entry change notification controls in
+   *          search result entries sent to the client.
    */
   public PersistentSearch(SearchOperation searchOperation,
-      Set<PersistentSearchChangeType> changeTypes, boolean returnECs)
+      Set<PersistentSearchChangeType> changeTypes, boolean changesOnly,
+      boolean returnECs)
   {
     this.searchOperation = searchOperation;
     this.changeTypes = changeTypes;
+    this.changesOnly = changesOnly;
     this.returnECs = returnECs;
   }
 
@@ -232,6 +238,18 @@
   }
 
   /**
+   * Returns whether only entries updated after the beginning of this persistent
+   * search should be returned.
+   *
+   * @return true if only entries updated after the beginning of this search
+   *         should be returned, false otherwise
+   */
+  public boolean isChangesOnly()
+  {
+    return changesOnly;
+  }
+
+  /**
    * Notifies the persistent searches that an entry has been added.
    *
    * @param entry
diff --git a/opendj3-server-dev/src/server/org/opends/server/extensions/ConfigFileHandler.java b/opendj3-server-dev/src/server/org/opends/server/extensions/ConfigFileHandler.java
index 150840d..24cf418 100644
--- a/opendj3-server-dev/src/server/org/opends/server/extensions/ConfigFileHandler.java
+++ b/opendj3-server-dev/src/server/org/opends/server/extensions/ConfigFileHandler.java
@@ -752,6 +752,7 @@
   @Override
   public void finalizeConfigHandler()
   {
+    finalizeBackend();
     try
     {
       DirectoryServer.deregisterBaseDN(configRootEntry.getDN());
@@ -764,13 +765,6 @@
 
   /** {@inheritDoc} */
   @Override
-  public void finalizeBackend()
-  {
-    // No implementation is required.
-  }
-
-  /** {@inheritDoc} */
-  @Override
   public ConfigEntry getConfigRootEntry()
          throws ConfigException
   {
diff --git a/opendj3-server-dev/src/server/org/opends/server/replication/plugin/LDAPReplicationDomain.java b/opendj3-server-dev/src/server/org/opends/server/replication/plugin/LDAPReplicationDomain.java
index 2ee7049..fe8a0ee 100644
--- a/opendj3-server-dev/src/server/org/opends/server/replication/plugin/LDAPReplicationDomain.java
+++ b/opendj3-server-dev/src/server/org/opends/server/replication/plugin/LDAPReplicationDomain.java
@@ -85,7 +85,6 @@
 import org.opends.server.types.operation.*;
 import org.opends.server.util.LDIFReader;
 import org.opends.server.util.TimeThread;
-import org.opends.server.workflowelement.externalchangelog.ECLWorkflowElement;
 import org.opends.server.workflowelement.localbackend.LocalBackendModifyOperation;
 
 import static org.forgerock.opendj.ldap.ResultCode.*;
@@ -478,7 +477,7 @@
     storeECLConfiguration(configuration);
     solveConflictFlag = isSolveConflict(configuration);
 
-    Backend backend = getBackend();
+    Backend<?> backend = getBackend();
     if (backend == null)
     {
       throw new ConfigException(ERR_SEARCHING_DOMAIN_BACKEND.get(
@@ -3468,7 +3467,7 @@
   private long exportBackend(OutputStream output, boolean checksumOutput)
       throws DirectoryException
   {
-    Backend backend = getBackend();
+    Backend<?> backend = getBackend();
 
     //  Acquire a shared lock for the backend.
     try
@@ -3601,7 +3600,7 @@
    * @throws DirectoryException
    *           If the backend could not be disabled or locked exclusively.
    */
-  private void preBackendImport(Backend backend) throws DirectoryException
+  private void preBackendImport(Backend<?> backend) throws DirectoryException
   {
     // Stop saving state
     stateSavingDisabled = true;
@@ -3629,10 +3628,9 @@
   @Override
   protected void importBackend(InputStream input) throws DirectoryException
   {
+    Backend<?> backend = getBackend();
+
     LDIFImportConfig importConfig = null;
-
-    Backend backend = getBackend();
-
     ImportExportContext ieCtx = getImportExportContext();
     try
     {
@@ -3718,7 +3716,7 @@
    * @param backend The backend implied in the import.
    * @exception DirectoryException Thrown when an error occurs.
    */
-  private void closeBackendImport(Backend backend) throws DirectoryException
+  private void closeBackendImport(Backend<?> backend) throws DirectoryException
   {
     String lockFile = LockFileManager.getBackendLockFileName(backend);
     StringBuilder failureReason = new StringBuilder();
@@ -3785,7 +3783,7 @@
    * Returns the backend associated to this domain.
    * @return The associated backend.
    */
-  private Backend getBackend()
+  private Backend<?> getBackend()
   {
     return DirectoryServer.getBackend(getBaseDN());
   }
@@ -4071,29 +4069,6 @@
 
     super.sessionInitiated(initStatus, rsState);
 
-    // Now that we are connected , we can enable ECL if :
-    // 1/ RS must in the same JVM and created an ECL_WORKFLOW_ELEMENT
-    // and 2/ this domain must NOT be private
-    if (!getBackend().isPrivateBackend())
-    {
-      try
-      {
-        ECLWorkflowElement wfe = (ECLWorkflowElement)
-        DirectoryServer.getWorkflowElement(
-            ECLWorkflowElement.ECL_WORKFLOW_ELEMENT);
-        if (wfe != null)
-        {
-          wfe.getReplicationServer().enableECL();
-        }
-      }
-      catch (DirectoryException de)
-      {
-        logger.info(NOTE_ERR_UNABLE_TO_ENABLE_ECL,
-            "Replication Domain on " + getBaseDNString(), stackTraceToSingleLineString(de));
-        // and go on
-      }
-    }
-
     // Now for bad data set status if needed
     if (forceBadDataSet)
     {
@@ -4346,7 +4321,7 @@
   @Override
   public long countEntries() throws DirectoryException
   {
-    Backend backend = getBackend();
+    Backend<?> backend = getBackend();
     if (!backend.supportsLDIFExport())
     {
       LocalizableMessage msg = ERR_INIT_EXPORT_NOT_SUPPORTED.get(backend.getBackendID());
diff --git a/opendj3-server-dev/src/server/org/opends/server/replication/server/ECLServerHandler.java b/opendj3-server-dev/src/server/org/opends/server/replication/server/ECLServerHandler.java
index b015eac..3157ee4 100644
--- a/opendj3-server-dev/src/server/org/opends/server/replication/server/ECLServerHandler.java
+++ b/opendj3-server-dev/src/server/org/opends/server/replication/server/ECLServerHandler.java
@@ -34,6 +34,7 @@
 import org.forgerock.i18n.LocalizableMessage;
 import org.forgerock.i18n.slf4j.LocalizedLogger;
 import org.forgerock.opendj.ldap.ResultCode;
+import org.opends.server.backends.ChangelogBackend;
 import org.opends.server.replication.common.CSN;
 import org.opends.server.replication.common.MultiDomainServerState;
 import org.opends.server.replication.common.ServerState;
@@ -155,8 +156,13 @@
     private final ReplicationServerDomain rsDomain;
 
     /**
-     * Active when there are still changes supposed eligible for the ECL. It is
-     * active by default.
+     * Active when there are still changes supposed eligible for the ECL.
+     * Here is the lifecycle of this field:
+     * <ol>
+     * <li>active==true at the start of the INIT phase,</li>
+     * <li>active==false when there are no more changes for a domain in the the INIT phase,</li>
+     * <li>active==true if it is a persistent search on external changelog. It never moves again</li>
+     * </ol>
      */
     private boolean active = true;
     private UpdateMsg nextMsg;
@@ -354,8 +360,7 @@
     super(session, queueSize, replicationServer, rcvWindowSize);
     try
     {
-      DN baseDN = DN.valueOf(ServerConstants.DN_EXTERNAL_CHANGELOG_ROOT);
-      setBaseDNAndDomain(baseDN, true);
+      setBaseDNAndDomain(ChangelogBackend.CHANGELOG_BASE_DN, true);
     }
     catch(DirectoryException de)
     {
@@ -853,14 +858,6 @@
   }
 
   /**
-   * Registers this handler into its related domain and notifies the domain.
-   */
-  private void registerIntoDomain()
-  {
-    replicationServerDomain.registerHandler(this);
-  }
-
-  /**
    * Shutdown this handler.
    */
   @Override
@@ -871,14 +868,20 @@
       logger.trace(this + " shutdown()");
     }
     releaseCursor();
-    for (DomainContext domainCtxt : domainCtxts) {
-      if (!domainCtxt.unRegisterHandler()) {
-        logger.error(LocalizableMessage.raw(this + " shutdown() - error when unregistering handler "+ domainCtxt.mh));
+    if (domainCtxts != null)
+    {
+      for (DomainContext domainCtxt : domainCtxts)
+      {
+        if (!domainCtxt.unRegisterHandler())
+        {
+          logger.error(LocalizableMessage.raw(this + " shutdown() - error when unregistering handler " + domainCtxt.mh));
+        }
+        domainCtxt.stopServer();
       }
-      domainCtxt.stopServer();
+      domainCtxts = null;
     }
+
     super.shutdown();
-    domainCtxts = null;
   }
 
   private void releaseCursor()
@@ -1020,11 +1023,11 @@
       closeInitPhase();
     }
 
-    registerIntoDomain();
+    replicationServerDomain.registerHandler(this);
 
     if (logger.isTraceEnabled())
     {
-      logger.trace(getClass().getCanonicalName() + " " + getOperationId()
+      logger.trace(getClass().getSimpleName() + " " + getOperationId()
           + " initialized: " + " " + dumpState() + domaimCtxtsToString(""));
     }
   }
@@ -1372,7 +1375,7 @@
           + dumpState());
     }
 
-    // go to persistent phase if one
+    // set all domains to be active again for the persistent phase
     for (DomainContext domainCtxt : domainCtxts) domainCtxt.active = true;
 
     if (startECLSessionMsg.getPersistent() != NON_PERSISTENT)
diff --git a/opendj3-server-dev/src/server/org/opends/server/replication/server/ECLServerWriter.java b/opendj3-server-dev/src/server/org/opends/server/replication/server/ECLServerWriter.java
index 45640f1..fe696d5 100644
--- a/opendj3-server-dev/src/server/org/opends/server/replication/server/ECLServerWriter.java
+++ b/opendj3-server-dev/src/server/org/opends/server/replication/server/ECLServerWriter.java
@@ -29,7 +29,7 @@
 import java.io.IOException;
 import java.net.SocketException;
 
-import org.opends.server.core.DirectoryServer;
+import org.opends.server.backends.ChangelogBackend;
 import org.opends.server.core.PersistentSearch;
 import org.forgerock.i18n.slf4j.LocalizedLogger;
 import org.opends.server.replication.protocol.DoneMsg;
@@ -39,7 +39,6 @@
 import org.opends.server.types.DirectoryException;
 import org.opends.server.types.Entry;
 import org.opends.server.workflowelement.externalchangelog.ECLSearchOperation;
-import org.opends.server.workflowelement.externalchangelog.ECLWorkflowElement;
 
 import static org.opends.messages.ReplicationMessages.*;
 import static org.opends.server.util.StaticUtils.*;
@@ -89,9 +88,8 @@
    */
   private PersistentSearch findPersistentSearch(ECLServerHandler handler)
   {
-    ECLWorkflowElement wfe = (ECLWorkflowElement)
-        DirectoryServer.getWorkflowElement(ECLWorkflowElement.ECL_WORKFLOW_ELEMENT);
-    for (PersistentSearch psearch : wfe.getPersistentSearches())
+    final ChangelogBackend backend = ChangelogBackend.getInstance();
+    for (PersistentSearch psearch : backend.getPersistentSearches())
     {
       if (psearch.getSearchOperation().toString().equals(
           handler.getOperationId()))
diff --git a/opendj3-server-dev/src/server/org/opends/server/replication/server/ReplicationServer.java b/opendj3-server-dev/src/server/org/opends/server/replication/server/ReplicationServer.java
index 67d358e..1783b4d 100644
--- a/opendj3-server-dev/src/server/org/opends/server/replication/server/ReplicationServer.java
+++ b/opendj3-server-dev/src/server/org/opends/server/replication/server/ReplicationServer.java
@@ -31,7 +31,6 @@
 import java.util.*;
 import java.util.concurrent.CopyOnWriteArraySet;
 import java.util.concurrent.atomic.AtomicBoolean;
-import java.util.concurrent.atomic.AtomicReference;
 
 import org.forgerock.i18n.LocalizableMessage;
 import org.forgerock.i18n.slf4j.LocalizedLogger;
@@ -46,8 +45,6 @@
 import org.opends.server.api.VirtualAttributeProvider;
 import org.opends.server.backends.ChangelogBackend;
 import org.opends.server.core.DirectoryServer;
-import org.opends.server.core.WorkflowImpl;
-import org.opends.server.core.networkgroups.NetworkGroup;
 import org.opends.server.replication.common.*;
 import org.opends.server.replication.plugin.MultimasterReplication;
 import org.opends.server.replication.protocol.*;
@@ -60,8 +57,6 @@
 import org.opends.server.replication.server.changelog.je.JEChangelogDB;
 import org.opends.server.replication.service.DSRSShutdownSync;
 import org.opends.server.types.*;
-import org.opends.server.util.ServerConstants;
-import org.opends.server.workflowelement.externalchangelog.ECLWorkflowElement;
 
 import static org.opends.messages.ConfigMessages.*;
 import static org.opends.messages.ReplicationMessages.*;
@@ -109,12 +104,6 @@
   /** To know whether a domain is enabled for the external changelog. */
   private final ECLEnabledDomainPredicate domainPredicate;
 
-  private static final String eclWorkflowID =
-    "External Changelog Workflow ID";
-  private ECLWorkflowElement eclwe;
-  private final AtomicReference<WorkflowImpl> eclWorkflowImpl =
-      new AtomicReference<WorkflowImpl>();
-
   /**
    * This is required for unit testing, so that we can keep track of all the
    * replication servers which are running in the VM.
@@ -173,6 +162,8 @@
     this.config = cfg;
     this.dsrsShutdownSync = dsrsShutdownSync;
     this.domainPredicate = predicate;
+
+    enableExternalChangeLog();
     ReplicationDBImplementation dbImpl = cfg.getReplicationDBImplementation();
     logger.trace("Using %s as DB implementation for changelog DB", dbImpl);
     if (dbImpl == ReplicationDBImplementation.JE)
@@ -188,9 +179,6 @@
     initialize();
     cfg.addChangeListener(this);
 
-    // TODO : uncomment to branch changelog backend
-    //enableExternalChangeLog();
-
     localPorts.add(getReplicationPort());
 
     // Keep track of this new instance
@@ -458,15 +446,6 @@
       listenThread = new ReplicationServerListenThread(this);
       listenThread.start();
 
-      // Creates the ECL workflow elem so that DS (LDAPReplicationDomain)
-      // can know me and really enableECL.
-      if (WorkflowImpl.getWorkflow(eclWorkflowID) != null)
-      {
-        // Already done. Nothing to do
-        return;
-      }
-      eclwe = new ECLWorkflowElement(this);
-
       if (logger.isTraceEnabled())
       {
         logger.trace("RS " + getMonitorInstanceName() + " successfully initialized");
@@ -477,50 +456,10 @@
     } catch (IOException e)
     {
       logger.error(ERR_COULD_NOT_BIND_CHANGELOG, getReplicationPort(), e.getMessage());
-    } catch (DirectoryException e)
-    {
-      //FIXME:DirectoryException is raised by initializeECL => fix err msg
-      logger.error(LocalizableMessage.raw(
-          "Directory Exception raised by ECL initialization: %s", e.getMessage()));
     }
   }
 
   /**
-   * Enable the ECL access by creating a dedicated workflow element.
-   * @throws DirectoryException when an error occurs.
-   */
-  public void enableECL() throws DirectoryException
-  {
-    if (eclWorkflowImpl.get() != null)
-    {
-      // ECL is already enabled, do nothing
-      return;
-    }
-
-    // Create the workflow for the base DN
-    // and register the workflow with the server.
-    final DN dn = DN.valueOf(ServerConstants.DN_EXTERNAL_CHANGELOG_ROOT);
-    final WorkflowImpl workflowImpl = new WorkflowImpl(eclWorkflowID, dn,
-        eclwe.getWorkflowElementID(), eclwe);
-    if (!eclWorkflowImpl.compareAndSet(null, workflowImpl))
-    {
-      // ECL is being enabled, do nothing
-      return;
-    }
-
-    workflowImpl.register();
-
-    NetworkGroup.getDefaultNetworkGroup().registerWorkflow(workflowImpl);
-
-    // FIXME:ECL should the ECL Workflow be registered in admin and internal
-    // network groups?
-    NetworkGroup.getAdminNetworkGroup().registerWorkflow(workflowImpl);
-    NetworkGroup.getInternalNetworkGroup().registerWorkflow(workflowImpl);
-
-    registerVirtualAttributeRules();
-  }
-
-  /**
    * Enable the external changelog if it is not already enabled.
    * <p>
    * The external changelog is provided by the changelog backend.
@@ -636,34 +575,6 @@
     }
   }
 
-  private void shutdownECL()
-  {
-    WorkflowImpl eclwf = (WorkflowImpl) WorkflowImpl.getWorkflow(eclWorkflowID);
-    // do it only if not already done by another RS (unit test case)
-    if (eclwf != null)
-    {
-      // FIXME:ECL should the ECL Workflow be registered in admin and internal
-      // network groups?
-      NetworkGroup.getInternalNetworkGroup().deregisterWorkflow(eclWorkflowID);
-      NetworkGroup.getAdminNetworkGroup().deregisterWorkflow(eclWorkflowID);
-
-      NetworkGroup.getDefaultNetworkGroup().deregisterWorkflow(eclWorkflowID);
-
-      deregisterVirtualAttributeRules();
-
-      eclwf.deregister();
-      eclwf.finalizeWorkflow();
-    }
-
-    eclwe = (ECLWorkflowElement) DirectoryServer
-        .getWorkflowElement("EXTERNAL CHANGE LOG");
-    if (eclwe != null)
-    {
-      DirectoryServer.deregisterWorkflowElement(eclwe);
-      eclwe.finalizeWorkflowElement();
-    }
-  }
-
   /**
    * Get the ReplicationServerDomain associated to the base DN given in
    * parameter.
@@ -901,9 +812,7 @@
       domain.shutdown();
     }
 
-    // TODO : switch to second method when changelog backend is branched
-    shutdownECL();
-    //shutdownExternalChangelog();
+    shutdownExternalChangelog();
 
     try
     {
diff --git a/opendj3-server-dev/src/server/org/opends/server/replication/server/changelog/je/ChangeNumberIndexer.java b/opendj3-server-dev/src/server/org/opends/server/replication/server/changelog/je/ChangeNumberIndexer.java
index 02a107f..77a80d8 100644
--- a/opendj3-server-dev/src/server/org/opends/server/replication/server/changelog/je/ChangeNumberIndexer.java
+++ b/opendj3-server-dev/src/server/org/opends/server/replication/server/changelog/je/ChangeNumberIndexer.java
@@ -31,6 +31,7 @@
 
 import org.forgerock.i18n.slf4j.LocalizedLogger;
 import org.opends.server.api.DirectoryThread;
+import org.opends.server.backends.ChangelogBackend;
 import org.opends.server.replication.common.CSN;
 import org.opends.server.replication.common.MultiDomainServerState;
 import org.opends.server.replication.common.ServerState;
@@ -524,6 +525,7 @@
   protected void notifyEntryAddedToChangelog(DN baseDN, long changeNumber,
       MultiDomainServerState cookie, UpdateMsg msg) throws ChangelogException
   {
+    ChangelogBackend.getInstance().notifyEntryAdded(baseDN, changeNumber, cookie.toString(), msg);
   }
 
   /**
diff --git a/opendj3-server-dev/src/server/org/opends/server/replication/server/changelog/je/JEChangelogDB.java b/opendj3-server-dev/src/server/org/opends/server/replication/server/changelog/je/JEChangelogDB.java
index 3d770b3..a0c0f57 100644
--- a/opendj3-server-dev/src/server/org/opends/server/replication/server/changelog/je/JEChangelogDB.java
+++ b/opendj3-server-dev/src/server/org/opends/server/replication/server/changelog/je/JEChangelogDB.java
@@ -39,6 +39,7 @@
 import org.forgerock.opendj.config.server.ConfigException;
 import org.opends.server.admin.std.server.ReplicationServerCfg;
 import org.opends.server.api.DirectoryThread;
+import org.opends.server.backends.ChangelogBackend;
 import org.opends.server.replication.common.CSN;
 import org.opends.server.replication.common.MultiDomainServerState;
 import org.opends.server.replication.common.ServerState;
@@ -838,6 +839,8 @@
     final JEReplicaDB replicaDB = pair.getFirst();
     replicaDB.add(updateMsg);
 
+    ChangelogBackend.getInstance().notifyEntryAdded(baseDN, 0, null, updateMsg);
+
     final ChangeNumberIndexer indexer = cnIndexer.get();
     if (indexer != null)
     {
diff --git a/opendj3-server-dev/src/server/org/opends/server/workflowelement/externalchangelog/ECLSearchOperation.java b/opendj3-server-dev/src/server/org/opends/server/workflowelement/externalchangelog/ECLSearchOperation.java
index ad76a71..9875814 100644
--- a/opendj3-server-dev/src/server/org/opends/server/workflowelement/externalchangelog/ECLSearchOperation.java
+++ b/opendj3-server-dev/src/server/org/opends/server/workflowelement/externalchangelog/ECLSearchOperation.java
@@ -37,6 +37,7 @@
 import org.forgerock.opendj.ldap.SearchScope;
 import org.opends.server.api.ClientConnection;
 import org.opends.server.api.plugin.PluginResult;
+import org.opends.server.backends.ChangelogBackend;
 import org.opends.server.config.ConfigConstants;
 import org.opends.server.controls.*;
 import org.opends.server.core.*;
@@ -62,6 +63,7 @@
 
 import static org.opends.messages.CoreMessages.*;
 import static org.opends.messages.ReplicationMessages.*;
+import static org.opends.server.backends.ChangelogBackend.*;
 import static org.opends.server.config.ConfigConstants.*;
 import static org.opends.server.replication.protocol.StartECLSessionMsg.ECLRequestType.*;
 import static org.opends.server.replication.protocol.StartECLSessionMsg.Persistent.*;
@@ -120,22 +122,6 @@
   private static final AttributeType MODIFIERS_NAME_TYPE =
       DirectoryConfig.getAttributeType(OP_ATTR_MODIFIERS_NAME_LC, true);
 
-
-  /** The associated DN. */
-  private static final DN CHANGELOG_ROOT_DN;
-  static
-  {
-    try
-    {
-      CHANGELOG_ROOT_DN = DN
-          .valueOf(ServerConstants.DN_EXTERNAL_CHANGELOG_ROOT);
-    }
-    catch (Exception e)
-    {
-      throw new RuntimeException(e);
-    }
-  }
-
   /**
    * The replication server in which the search on ECL is to be performed.
    */
@@ -298,7 +284,10 @@
       // If there's a persistent search, then register it with the server.
       if (persistentSearch != null)
       {
-        wfe.registerPersistentSearch(persistentSearch);
+        ChangelogBackend.getInstance().registerPersistentSearch(persistentSearch);
+        // TODO JNR Add callback on cancel,
+        // see ECLWorkflowElement.registerPersistentSearch().
+        // This will be removed very soon anyway.
         persistentSearch.enable();
       }
 
@@ -518,6 +507,7 @@
 
           persistentSearch = new PersistentSearch(this,
               psearchControl.getChangeTypes(),
+              psearchControl.getChangesOnly(),
               psearchControl.getReturnECs());
 
           // If we're only interested in changes, then we don't actually want
@@ -596,7 +586,7 @@
       ECLUpdateMsg update = eclServerHandler.getNextECLUpdate();
 
       // Return root entry if requested.
-      if (CHANGELOG_ROOT_DN.matchesBaseAndScope(baseDN, getScope()))
+      if (CHANGELOG_BASE_DN.matchesBaseAndScope(baseDN, getScope()))
       {
         final Entry entry = createRootEntry(update != null);
         if (filter.matchesEntry(entry) && !returnEntry(entry, null))
@@ -607,7 +597,7 @@
         }
       }
 
-      if (baseDN.equals(CHANGELOG_ROOT_DN)
+      if (baseDN.equals(CHANGELOG_BASE_DN)
           && getScope().equals(SearchScope.BASE_OBJECT))
       {
         // Only the change log root entry was requested. There is no need to
@@ -907,9 +897,9 @@
     addAttributeByUppercaseName("hassubordinates", "hasSubordinates",
         Boolean.toString(hasSubordinates), userAttrs, operationalAttrs);
     addAttributeByUppercaseName("entrydn", "entryDN",
-        CHANGELOG_ROOT_DN.toNormalizedString(), userAttrs, operationalAttrs);
+        DN_EXTERNAL_CHANGELOG_ROOT, userAttrs, operationalAttrs);
 
-    return new Entry(CHANGELOG_ROOT_DN, CHANGELOG_ROOT_OBJECT_CLASSES,
+    return new Entry(CHANGELOG_BASE_DN, CHANGELOG_ROOT_OBJECT_CLASSES,
         userAttrs, operationalAttrs);
   }
 
diff --git a/opendj3-server-dev/src/server/org/opends/server/workflowelement/externalchangelog/ECLWorkflowElement.java b/opendj3-server-dev/src/server/org/opends/server/workflowelement/externalchangelog/ECLWorkflowElement.java
index 1d164e2..850badc 100644
--- a/opendj3-server-dev/src/server/org/opends/server/workflowelement/externalchangelog/ECLWorkflowElement.java
+++ b/opendj3-server-dev/src/server/org/opends/server/workflowelement/externalchangelog/ECLWorkflowElement.java
@@ -26,15 +26,11 @@
  */
 package org.opends.server.workflowelement.externalchangelog;
 
-
-
 import java.util.ArrayList;
 import java.util.List;
-import java.util.concurrent.CopyOnWriteArrayList;
 
 import org.opends.server.admin.std.server.WorkflowElementCfg;
 import org.opends.server.core.DirectoryServer;
-import org.opends.server.core.PersistentSearch;
 import org.opends.server.core.SearchOperation;
 import org.forgerock.i18n.slf4j.LocalizedLogger;
 import org.opends.server.replication.server.ReplicationServer;
@@ -43,25 +39,15 @@
 import org.opends.server.types.Operation;
 import org.opends.server.workflowelement.LeafWorkflowElement;
 
-
-
-
 /**
  * This class defines a workflow element for the external changelog (ECL);
  * e-g an entity that handles the processing of an operation against the ECL.
  */
-public class ECLWorkflowElement extends
-    LeafWorkflowElement<WorkflowElementCfg>
+public class ECLWorkflowElement extends LeafWorkflowElement<WorkflowElementCfg>
 {
   private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
 
   /**
-   *The set of persistent searches registered with this work flow element.
-   */
-  private final List<PersistentSearch> persistentSearches =
-    new CopyOnWriteArrayList<PersistentSearch>();
-
-  /**
    * A string indicating the type of the workflow element.
    */
   public static final String ECL_WORKFLOW_ELEMENT = "EXTERNAL CHANGE LOG";
@@ -70,7 +56,7 @@
    * The replication server object to which we will submits request
    * on the ECL. Retrieved from the local DirectoryServer.
    */
-  private ReplicationServer replicationServer;
+  private final ReplicationServer replicationServer;
 
   /**
    * Creates a new instance of the External Change Log workflow element.
@@ -86,26 +72,16 @@
     DirectoryServer.registerWorkflowElement(this);
   }
 
-  /**
-   * {@inheritDoc}
-   */
+  /** {@inheritDoc} */
   @Override
   public void finalizeWorkflowElement()
   {
-    // null all fields so that any use of the finalized object will raise
-    // an NPE
+    // null all fields so that any use of the finalized object will raise a NPE
     super.initialize(ECL_WORKFLOW_ELEMENT, null);
-
-    // Cancel all persistent searches.
-    for (PersistentSearch psearch : persistentSearches) {
-      psearch.cancel();
-    }
-    persistentSearches.clear();
   }
 
-  /**
-   * {@inheritDoc}
-   */
+  /** {@inheritDoc} */
+  @Override
   public void execute(Operation operation) throws CanceledOperationException {
     switch (operation.getOperationType())
     {
@@ -166,45 +142,6 @@
   }
 
   /**
-   * Registers the provided persistent search operation with this
-   * workflow element so that it will be notified of any
-   * add, delete, modify, or modify DN operations that are performed.
-   *
-   * @param persistentSearch
-   *          The persistent search operation to register with this
-   *          workflow element.
-   */
-  void registerPersistentSearch(PersistentSearch persistentSearch)
-  {
-    PersistentSearch.CancellationCallback callback =
-      new PersistentSearch.CancellationCallback()
-    {
-      public void persistentSearchCancelled(PersistentSearch psearch)
-      {
-        psearch.getSearchOperation().cancel(null);
-        persistentSearches.remove(psearch);
-      }
-    };
-
-    persistentSearches.add(persistentSearch);
-    persistentSearch.registerCancellationCallback(callback);
-  }
-
-
-
-  /**
-   * Gets the list of persistent searches currently active against
-   * this workflow element.
-   *
-   * @return The list of persistent searches currently active against
-   *         this workflow element.
-   */
-  public List<PersistentSearch> getPersistentSearches()
-  {
-    return persistentSearches;
-  }
-
-  /**
    * Returns the associated replication server.
    * @return the rs.
    */
diff --git a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendAddOperation.java b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendAddOperation.java
index 28a37dc..639a926 100644
--- a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendAddOperation.java
+++ b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendAddOperation.java
@@ -215,7 +215,7 @@
         @Override
         public void run()
         {
-          for (PersistentSearch psearch : wfe.getPersistentSearches())
+          for (PersistentSearch psearch : backend.getPersistentSearches())
           {
             psearch.processAdd(entry);
           }
diff --git a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendDeleteOperation.java b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendDeleteOperation.java
index ec7ecb2..a77181c 100644
--- a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendDeleteOperation.java
+++ b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendDeleteOperation.java
@@ -186,7 +186,7 @@
         @Override
         public void run()
         {
-          for (PersistentSearch psearch : wfe.getPersistentSearches())
+          for (PersistentSearch psearch : backend.getPersistentSearches())
           {
             psearch.processDelete(entry);
           }
diff --git a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendModifyDNOperation.java b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendModifyDNOperation.java
index f24c30c..ede3a9c 100644
--- a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendModifyDNOperation.java
+++ b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendModifyDNOperation.java
@@ -225,7 +225,7 @@
         @Override
         public void run()
         {
-          for (PersistentSearch psearch : wfe.getPersistentSearches())
+          for (PersistentSearch psearch : backend.getPersistentSearches())
           {
             psearch.processModifyDN(newEntry, currentEntry.getName());
           }
diff --git a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendModifyOperation.java b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendModifyOperation.java
index 84da1f9..d32f87f 100644
--- a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendModifyOperation.java
+++ b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendModifyOperation.java
@@ -355,7 +355,7 @@
         @Override
         public void run()
         {
-          for (PersistentSearch psearch : wfe.getPersistentSearches())
+          for (PersistentSearch psearch : backend.getPersistentSearches())
           {
             psearch.processModify(modifiedEntry, currentEntry);
           }
@@ -666,7 +666,7 @@
         Control c = iter.next();
         String  oid = c.getOID();
 
-        if (oid.equals(OID_LDAP_ASSERTION))
+        if (OID_LDAP_ASSERTION.equals(oid))
         {
           LDAPAssertionRequestControl assertControl =
                 getRequestControl(LDAPAssertionRequestControl.DECODER);
@@ -718,19 +718,19 @@
                     entryDN, de.getMessageObject()));
           }
         }
-        else if (oid.equals(OID_LDAP_NOOP_OPENLDAP_ASSIGNED))
+        else if (OID_LDAP_NOOP_OPENLDAP_ASSIGNED.equals(oid))
         {
           noOp = true;
         }
-        else if (oid.equals(OID_PERMISSIVE_MODIFY_CONTROL))
+        else if (OID_PERMISSIVE_MODIFY_CONTROL.equals(oid))
         {
           permissiveModify = true;
         }
-        else if (oid.equals(OID_LDAP_READENTRY_PREREAD))
+        else if (OID_LDAP_READENTRY_PREREAD.equals(oid))
         {
           preReadRequest = getRequestControl(LDAPPreReadRequestControl.DECODER);
         }
-        else if (oid.equals(OID_LDAP_READENTRY_POSTREAD))
+        else if (OID_LDAP_READENTRY_POSTREAD.equals(oid))
         {
           if (c instanceof LDAPPostReadRequestControl)
           {
@@ -742,7 +742,7 @@
             iter.set(postReadRequest);
           }
         }
-        else if (oid.equals(OID_PROXIED_AUTH_V1))
+        else if (OID_PROXIED_AUTH_V1.equals(oid))
         {
           // Log usage of legacy proxy authz V1 control.
           addAdditionalLogItem(AdditionalLogItem.keyOnly(getClass(),
@@ -763,7 +763,7 @@
           setAuthorizationEntry(authorizationEntry);
           setProxiedAuthorizationDN(getName(authorizationEntry));
         }
-        else if (oid.equals(OID_PROXIED_AUTH_V2))
+        else if (OID_PROXIED_AUTH_V2.equals(oid))
         {
           // The requester must have the PROXIED_AUTH privilege in order to
           // be able to use this control.
@@ -780,7 +780,7 @@
           setAuthorizationEntry(authorizationEntry);
           setProxiedAuthorizationDN(getName(authorizationEntry));
         }
-        else if (oid.equals(OID_PASSWORD_POLICY_CONTROL))
+        else if (OID_PASSWORD_POLICY_CONTROL.equals(oid))
         {
           pwPolicyControlRequested = true;
         }
@@ -846,13 +846,11 @@
       // See if the attribute is one which controls the privileges available for
       // a user.  If it is, then the client must have the PRIVILEGE_CHANGE
       // privilege.
-      if (t.hasName(OP_ATTR_PRIVILEGE_NAME))
+      if (t.hasName(OP_ATTR_PRIVILEGE_NAME)
+          && !clientConnection.hasPrivilege(Privilege.PRIVILEGE_CHANGE, this))
       {
-        if (! clientConnection.hasPrivilege(Privilege.PRIVILEGE_CHANGE, this))
-        {
-          throw new DirectoryException(ResultCode.INSUFFICIENT_ACCESS_RIGHTS,
-                  ERR_MODIFY_CHANGE_PRIVILEGE_INSUFFICIENT_PRIVILEGES.get());
-        }
+        throw new DirectoryException(ResultCode.INSUFFICIENT_ACCESS_RIGHTS,
+                ERR_MODIFY_CHANGE_PRIVILEGE_INSUFFICIENT_PRIVILEGES.get());
       }
 
       // If the modification is not updating the password attribute,
@@ -1086,11 +1084,11 @@
       numPasswords = passwordsToAdd;
     }
 
-    // If there were multiple password values, then make sure that's
-    // OK.
-    if ((!isInternalOperation())
-        && (!pwPolicyState.getAuthenticationPolicy()
-            .isAllowMultiplePasswordValues()) && (passwordsToAdd > 1))
+    // If there were multiple password values, then make sure that's OK.
+    final PasswordPolicy authPolicy = pwPolicyState.getAuthenticationPolicy();
+    if (!isInternalOperation()
+        && !authPolicy.isAllowMultiplePasswordValues()
+        && passwordsToAdd > 1)
     {
       pwpErrorType = PasswordPolicyErrorType.PASSWORD_MOD_NOT_ALLOWED;
       throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION,
@@ -1106,9 +1104,8 @@
     {
       if (pwPolicyState.passwordIsPreEncoded(v))
       {
-        if ((!isInternalOperation())
-            && !pwPolicyState.getAuthenticationPolicy()
-                .isAllowPreEncodedPasswords())
+        if (!isInternalOperation()
+            && !authPolicy.isAllowPreEncodedPasswords())
         {
           pwpErrorType = PasswordPolicyErrorType.INSUFFICIENT_PASSWORD_QUALITY;
           throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION,
@@ -1121,15 +1118,13 @@
       }
       else
       {
-        if (m.getModificationType() == ModificationType.ADD)
+        if (m.getModificationType() == ModificationType.ADD
+            // Make sure that the password value does not already exist.
+            && pwPolicyState.passwordMatches(v))
         {
-          // Make sure that the password value doesn't already exist.
-          if (pwPolicyState.passwordMatches(v))
-          {
-            pwpErrorType = PasswordPolicyErrorType.PASSWORD_IN_HISTORY;
-            throw new DirectoryException(ResultCode.ATTRIBUTE_OR_VALUE_EXISTS,
-                ERR_MODIFY_PASSWORD_EXISTS.get());
-          }
+          pwpErrorType = PasswordPolicyErrorType.PASSWORD_IN_HISTORY;
+          throw new DirectoryException(ResultCode.ATTRIBUTE_OR_VALUE_EXISTS,
+              ERR_MODIFY_PASSWORD_EXISTS.get());
         }
 
         if (newPasswords == null)
@@ -1214,7 +1209,7 @@
       else
       {
         List<Attribute> attrList = currentEntry.getAttribute(pwAttr.getAttributeType());
-        if ((attrList == null) || (attrList.isEmpty()))
+        if (attrList == null || attrList.isEmpty())
         {
           throw new DirectoryException(ResultCode.NO_SUCH_ATTRIBUTE,
               ERR_MODIFY_NO_EXISTING_VALUES.get());
@@ -1232,48 +1227,37 @@
                     .decodeAuthPassword(av.toString());
                 PasswordStorageScheme<?> scheme = DirectoryServer
                     .getAuthPasswordStorageScheme(components[0].toString());
-                if (scheme != null)
-                {
-                  if (scheme.authPasswordMatches(v,
-                      components[1].toString(), components[2].toString()))
-                  {
-                    builder.add(av);
-                    found = true;
-                  }
-                }
-              }
-              else
-              {
-                if (av.equals(v))
-                {
-                  builder.add(v);
-                  found = true;
-                }
-              }
-            }
-            else
-            {
-              if (UserPasswordSyntax.isEncoded(av))
-              {
-                String[] components = UserPasswordSyntax.decodeUserPassword(av.toString());
-                PasswordStorageScheme<?> scheme = DirectoryServer
-                    .getPasswordStorageScheme(toLowerCase(components[0]));
                 if (scheme != null
-                    && scheme.passwordMatches(v, ByteString.valueOf(components[1])))
+                    && scheme.authPasswordMatches(v,
+                        components[1].toString(), components[2].toString()))
                 {
                   builder.add(av);
                   found = true;
                 }
               }
-              else
+              else if (av.equals(v))
               {
-                if (av.equals(v))
-                {
-                  builder.add(v);
-                  found = true;
-                }
+                builder.add(v);
+                found = true;
               }
             }
+            else if (UserPasswordSyntax.isEncoded(av))
+            {
+              String[] components = UserPasswordSyntax.decodeUserPassword(av.toString());
+              PasswordStorageScheme<?> scheme = DirectoryServer
+                  .getPasswordStorageScheme(toLowerCase(components[0]));
+              if (scheme != null
+                  && scheme.passwordMatches(v, ByteString.valueOf(components[1])))
+              {
+                builder.add(av);
+                found = true;
+              }
+            }
+            else if (av.equals(v))
+            {
+              builder.add(v);
+              found = true;
+            }
           }
         }
 
@@ -1706,13 +1690,8 @@
   public void performAdditionalPasswordChangedProcessing()
          throws DirectoryException
   {
-    if (pwPolicyState == null)
-    {
-      // Account not managed locally so nothing to do.
-      return;
-    }
-
-    if (!passwordChanged)
+    if (!passwordChanged
+        || pwPolicyState == null) // Account not managed locally
     {
       // Nothing to do.
       return;
@@ -1743,70 +1722,62 @@
 
 
     // If any of the password values should be validated, then do so now.
-    if (selfChange || !authPolicy.isSkipValidationForAdministrators())
+    if (newPasswords != null
+        && (selfChange || !authPolicy.isSkipValidationForAdministrators()))
     {
-      if (newPasswords != null)
+      HashSet<ByteString> clearPasswords = new HashSet<ByteString>(pwPolicyState.getClearPasswords());
+      if (currentPasswords != null)
       {
-        HashSet<ByteString> clearPasswords = new HashSet<ByteString>();
-        clearPasswords.addAll(pwPolicyState.getClearPasswords());
-
-        if (currentPasswords != null)
+        if (clearPasswords.isEmpty())
         {
-          if (clearPasswords.isEmpty())
+          clearPasswords.addAll(currentPasswords);
+        }
+        else
+        {
+          // NOTE:  We can't rely on the fact that Set doesn't allow
+          // duplicates because technically it's possible that the values
+          // aren't duplicates if they are ASN.1 elements with different types
+          // (like 0x04 for a standard universal octet string type versus 0x80
+          // for a simple password in a bind operation).  So we have to
+          // manually check for duplicates.
+          for (ByteString pw : currentPasswords)
           {
-            clearPasswords.addAll(currentPasswords);
-          }
-          else
-          {
-            // NOTE:  We can't rely on the fact that Set doesn't allow
-            // duplicates because technically it's possible that the values
-            // aren't duplicates if they are ASN.1 elements with different types
-            // (like 0x04 for a standard universal octet string type versus 0x80
-            // for a simple password in a bind operation).  So we have to
-            // manually check for duplicates.
-            for (ByteString pw : currentPasswords)
+            if (!clearPasswords.contains(pw))
             {
-              if (!clearPasswords.contains(pw))
-              {
-                clearPasswords.add(pw);
-              }
+              clearPasswords.add(pw);
             }
           }
         }
+      }
 
-        for (ByteString v : newPasswords)
+      for (ByteString v : newPasswords)
+      {
+        LocalizableMessageBuilder invalidReason = new LocalizableMessageBuilder();
+        if (! pwPolicyState.passwordIsAcceptable(this, modifiedEntry,
+                                 v, clearPasswords, invalidReason))
         {
-          LocalizableMessageBuilder invalidReason = new LocalizableMessageBuilder();
-          if (! pwPolicyState.passwordIsAcceptable(this, modifiedEntry,
-                                   v, clearPasswords, invalidReason))
-          {
-            pwpErrorType = PasswordPolicyErrorType.INSUFFICIENT_PASSWORD_QUALITY;
-            throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION,
-                ERR_MODIFY_PW_VALIDATION_FAILED.get(invalidReason));
-          }
+          pwpErrorType = PasswordPolicyErrorType.INSUFFICIENT_PASSWORD_QUALITY;
+          throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION,
+              ERR_MODIFY_PW_VALIDATION_FAILED.get(invalidReason));
         }
       }
     }
 
-
     // If we should check the password history, then do so now.
-    if (pwPolicyState.maintainHistory())
+    if (newPasswords != null && pwPolicyState.maintainHistory())
     {
-      if (newPasswords != null)
+      for (ByteString v : newPasswords)
       {
-        for (ByteString v : newPasswords)
+        if (pwPolicyState.isPasswordInHistory(v)
+            && (selfChange || !authPolicy.isSkipValidationForAdministrators()))
         {
-          if (pwPolicyState.isPasswordInHistory(v)
-              && (selfChange || !authPolicy.isSkipValidationForAdministrators()))
-          {
-            pwpErrorType = PasswordPolicyErrorType.PASSWORD_IN_HISTORY;
-            throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION,
-                ERR_MODIFY_PW_IN_HISTORY.get());
-          }
+          pwpErrorType = PasswordPolicyErrorType.PASSWORD_IN_HISTORY;
+          throw new DirectoryException(ResultCode.CONSTRAINT_VIOLATION,
+              ERR_MODIFY_PW_IN_HISTORY.get());
         }
-
-        pwPolicyState.updatePasswordHistory();
       }
+
+      pwPolicyState.updatePasswordHistory();
     }
 
 
@@ -1862,7 +1833,7 @@
       return;
     }
 
-    if (!(passwordChanged || enabledStateChanged || wasLocked))
+    if (!passwordChanged && !enabledStateChanged && !wasLocked)
     {
       // Account managed locally, but unchanged, so nothing to do.
       return;
diff --git a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendSearchOperation.java b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendSearchOperation.java
index 4a206b1..83c0fd2 100644
--- a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendSearchOperation.java
+++ b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendSearchOperation.java
@@ -56,41 +56,21 @@
 {
   private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
 
+  /** The backend in which the search is to be performed. */
+  private Backend<?> backend;
 
-
-  /**
-   * The backend in which the search is to be performed.
-   */
-  private Backend backend;
-
-  /**
-   * Indicates whether we should actually process the search.  This should
-   * only be false if it's a persistent search with changesOnly=true.
-   */
-  private boolean processSearch;
-
-  /**
-   * The client connection for the search operation.
-   */
+  /** The client connection for the search operation. */
   private ClientConnection clientConnection;
 
-  /**
-   * The base DN for the search.
-   */
+  /** The base DN for the search. */
   private DN baseDN;
 
-  /**
-   * The persistent search request, if applicable.
-   */
+  /** The persistent search request, if applicable. */
   private PersistentSearch persistentSearch;
 
-  /**
-   * The filter for the search.
-   */
+  /** The filter for the search. */
   private SearchFilter filter;
 
-
-
   /**
    * Creates a new operation that may be used to search for entries in a local
    * backend of the Directory Server.
@@ -117,10 +97,7 @@
       throws CanceledOperationException
   {
     this.backend = wfe.getBackend();
-
-    clientConnection = getClientConnection();
-
-    processSearch = true;
+    this.clientConnection = getClientConnection();
 
     // Check for a request to cancel this operation.
     checkIfCanceled(false);
@@ -128,7 +105,7 @@
     try
     {
       BooleanHolder executePostOpPlugins = new BooleanHolder(false);
-      processSearch(wfe, executePostOpPlugins);
+      processSearch(executePostOpPlugins);
 
       // Check for a request to cancel this operation.
       checkIfCanceled(false);
@@ -154,8 +131,7 @@
     }
   }
 
-  private void processSearch(LocalBackendWorkflowElement wfe,
-      BooleanHolder executePostOpPlugins) throws CanceledOperationException
+  private void processSearch(BooleanHolder executePostOpPlugins) throws CanceledOperationException
   {
     // Process the search base and filter to convert them from their raw forms
     // as provided by the client to the forms required for the rest of the
@@ -163,7 +139,7 @@
     baseDN = getBaseDN();
     filter = getFilter();
 
-    if ((baseDN == null) || (filter == null))
+    if (baseDN == null || filter == null)
     {
       return;
     }
@@ -245,8 +221,13 @@
 
 
     // If there's a persistent search, then register it with the server.
+    boolean processSearchNow = true;
     if (persistentSearch != null)
     {
+      // If we're only interested in changes, then we do not actually want
+      // to process the search now.
+      processSearchNow = !persistentSearch.isChangesOnly();
+
       // The Core server maintains the count of concurrent persistent searches
       // so that all the backends (Remote and Local) are aware of it. Verify
       // with the core if we have already reached the threshold.
@@ -256,7 +237,7 @@
         appendErrorMessage(ERR_MAX_PSEARCH_LIMIT_EXCEEDED.get());
         return;
       }
-      wfe.registerPersistentSearch(persistentSearch);
+      backend.registerPersistentSearch(persistentSearch);
       persistentSearch.enable();
     }
 
@@ -264,7 +245,7 @@
     // Process the search in the backend and all its subordinates.
     try
     {
-      if (processSearch)
+      if (processSearchNow)
       {
         backend.search(this);
       }
@@ -320,14 +301,13 @@
     LocalBackendWorkflowElement.removeAllDisallowedControls(baseDN, this);
 
     List<Control> requestControls  = getRequestControls();
-    if ((requestControls != null) && (! requestControls.isEmpty()))
+    if (requestControls != null && ! requestControls.isEmpty())
     {
-      for (int i=0; i < requestControls.size(); i++)
+      for (Control c : requestControls)
       {
-        Control c   = requestControls.get(i);
         String  oid = c.getOID();
 
-        if (oid.equals(OID_LDAP_ASSERTION))
+        if (OID_LDAP_ASSERTION.equals(oid))
         {
           LDAPAssertionRequestControl assertControl =
                 getRequestControl(LDAPAssertionRequestControl.DECODER);
@@ -397,7 +377,7 @@
                                 de.getMessageObject()), de);
           }
         }
-        else if (oid.equals(OID_PROXIED_AUTH_V1))
+        else if (OID_PROXIED_AUTH_V1.equals(oid))
         {
           // Log usage of legacy proxy authz V1 control.
           addAdditionalLogItem(AdditionalLogItem.keyOnly(getClass(),
@@ -416,16 +396,9 @@
 
           Entry authorizationEntry = proxyControl.getAuthorizationEntry();
           setAuthorizationEntry(authorizationEntry);
-          if (authorizationEntry == null)
-          {
-            setProxiedAuthorizationDN(DN.rootDN());
-          }
-          else
-          {
-            setProxiedAuthorizationDN(authorizationEntry.getName());
-          }
+          setProxiedAuthorizationDN(getName(authorizationEntry));
         }
-        else if (oid.equals(OID_PROXIED_AUTH_V2))
+        else if (OID_PROXIED_AUTH_V2.equals(oid))
         {
           // The requester must have the PROXIED_AUTH privilege in order to be
           // able to use this control.
@@ -440,38 +413,23 @@
 
           Entry authorizationEntry = proxyControl.getAuthorizationEntry();
           setAuthorizationEntry(authorizationEntry);
-          if (authorizationEntry == null)
-          {
-            setProxiedAuthorizationDN(DN.rootDN());
-          }
-          else
-          {
-            setProxiedAuthorizationDN(authorizationEntry.getName());
-          }
+          setProxiedAuthorizationDN(getName(authorizationEntry));
         }
-        else if (oid.equals(OID_PERSISTENT_SEARCH))
+        else if (OID_PERSISTENT_SEARCH.equals(oid))
         {
-          PersistentSearchControl psearchControl =
-            getRequestControl(PersistentSearchControl.DECODER);
+          final PersistentSearchControl ctrl =
+              getRequestControl(PersistentSearchControl.DECODER);
 
           persistentSearch = new PersistentSearch(this,
-                                      psearchControl.getChangeTypes(),
-                                      psearchControl.getReturnECs());
-
-          // If we're only interested in changes, then we don't actually want
-          // to process the search now.
-          if (psearchControl.getChangesOnly())
-          {
-            processSearch = false;
-          }
+              ctrl.getChangeTypes(), ctrl.getChangesOnly(), ctrl.getReturnECs());
         }
-        else if (oid.equals(OID_LDAP_SUBENTRIES))
+        else if (OID_LDAP_SUBENTRIES.equals(oid))
         {
           SubentriesControl subentriesControl =
                   getRequestControl(SubentriesControl.DECODER);
           setReturnSubentriesOnly(subentriesControl.getVisibility());
         }
-        else if (oid.equals(OID_LDUP_SUBENTRIES))
+        else if (OID_LDUP_SUBENTRIES.equals(oid))
         {
           // Support for legacy draft-ietf-ldup-subentry.
           addAdditionalLogItem(AdditionalLogItem.keyOnly(getClass(),
@@ -479,25 +437,25 @@
 
           setReturnSubentriesOnly(true);
         }
-        else if (oid.equals(OID_MATCHED_VALUES))
+        else if (OID_MATCHED_VALUES.equals(oid))
         {
           MatchedValuesControl matchedValuesControl =
                 getRequestControl(MatchedValuesControl.DECODER);
           setMatchedValuesControl(matchedValuesControl);
         }
-        else if (oid.equals(OID_ACCOUNT_USABLE_CONTROL))
+        else if (OID_ACCOUNT_USABLE_CONTROL.equals(oid))
         {
           setIncludeUsableControl(true);
         }
-        else if (oid.equals(OID_REAL_ATTRS_ONLY))
+        else if (OID_REAL_ATTRS_ONLY.equals(oid))
         {
           setRealAttributesOnly(true);
         }
-        else if (oid.equals(OID_VIRTUAL_ATTRS_ONLY))
+        else if (OID_VIRTUAL_ATTRS_ONLY.equals(oid))
         {
           setVirtualAttributesOnly(true);
         }
-        else if (oid.equals(OID_GET_EFFECTIVE_RIGHTS) &&
+        else if (OID_GET_EFFECTIVE_RIGHTS.equals(oid) &&
           DirectoryServer.isSupportedControl(OID_GET_EFFECTIVE_RIGHTS))
         {
           // Do nothing here and let AciHandler deal with it.
@@ -514,6 +472,11 @@
     }
   }
 
+  private DN getName(Entry e)
+  {
+    return e != null ? e.getName() : DN.rootDN();
+  }
+
   /** Indicates if the backend supports the control corresponding to provided oid. */
   private boolean backendSupportsControl(final String oid)
   {
diff --git a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendWorkflowElement.java b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendWorkflowElement.java
index 84c4353..fe44037 100644
--- a/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendWorkflowElement.java
+++ b/opendj3-server-dev/src/server/org/opends/server/workflowelement/localbackend/LocalBackendWorkflowElement.java
@@ -30,7 +30,6 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.TreeMap;
-import java.util.concurrent.CopyOnWriteArrayList;
 
 import org.forgerock.i18n.LocalizableMessage;
 import org.forgerock.i18n.LocalizableMessageDescriptor;
@@ -65,7 +64,7 @@
   private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();
 
   /** the backend associated with the local workflow element. */
-  private Backend backend;
+  private Backend<?> backend;
 
 
   /** the set of local backend workflow elements registered with the server. */
@@ -74,13 +73,7 @@
             new TreeMap<String, LocalBackendWorkflowElement>();
 
   /**
-   * The set of persistent searches registered with this work flow element.
-   */
-  private final List<PersistentSearch> persistentSearches =
-    new CopyOnWriteArrayList<PersistentSearch>();
-
-  /**
-   * a lock to guarantee safe concurrent access to the registeredLocalBackends
+   * A lock to guarantee safe concurrent access to the registeredLocalBackends
    * variable.
    */
   private static final Object registeredLocalBackendsLock = new Object();
@@ -109,9 +102,8 @@
    * @param workflowElementID  the workflow element identifier
    * @param backend  the backend associated to that workflow element
    */
-  private void initialize(String workflowElementID, Backend backend)
+  private void initialize(String workflowElementID, Backend<?> backend)
   {
-    // Initialize the workflow ID
     super.initialize(workflowElementID, BACKEND_WORKFLOW_ELEMENT);
 
     this.backend  = backend;
@@ -151,29 +143,16 @@
     processWorkflowElementConfig(configuration, true);
   }
 
-
-  /**
-   * {@inheritDoc}
-   */
+  /** {@inheritDoc} */
   @Override
   public void finalizeWorkflowElement()
   {
-    // null all fields so that any use of the finalized object will raise
-    // an NPE
+    // null all fields so that any use of the finalized object will raise a NPE
     super.initialize(null, null);
     backend = null;
-
-    // Cancel all persistent searches.
-    for (PersistentSearch psearch : persistentSearches) {
-      psearch.cancel();
-    }
-    persistentSearches.clear();
   }
 
-
-  /**
-   * {@inheritDoc}
-   */
+  /** {@inheritDoc} */
   @Override
   public boolean isConfigurationChangeAcceptable(
       LocalBackendWorkflowElementCfg configuration,
@@ -183,10 +162,7 @@
     return processWorkflowElementConfig(configuration, false);
   }
 
-
-  /**
-   * {@inheritDoc}
-   */
+  /** {@inheritDoc} */
   @Override
   public ConfigChangeResult applyConfigurationChange(
       LocalBackendWorkflowElementCfg configuration
@@ -221,7 +197,7 @@
     {
       // Read configuration.
       String newBackendID = configuration.getBackend();
-      Backend newBackend  = DirectoryServer.getBackend(newBackendID);
+      Backend<?> newBackend = DirectoryServer.getBackend(newBackendID);
 
       // If the backend is null (i.e. not found in the list of
       // registered backends, this is probably because we are looking
@@ -270,8 +246,7 @@
    *         element.
    */
   public static LocalBackendWorkflowElement createAndRegister(
-      String workflowElementID,
-      Backend backend)
+      String workflowElementID, Backend<?> backend)
   {
     // If the requested workflow element does not exist then create one.
     LocalBackendWorkflowElement localBackend =
@@ -655,11 +630,7 @@
     }
   }
 
-
-
-  /**
-   * {@inheritDoc}
-   */
+  /** {@inheritDoc} */
   @Override
   public void execute(Operation operation) throws CanceledOperationException {
     switch (operation.getOperationType())
@@ -760,54 +731,11 @@
    * @return The backend associated with this local backend workflow
    *         element.
    */
-  public Backend getBackend()
+  public Backend<?> getBackend()
   {
     return backend;
   }
 
-
-
-  /**
-   * Registers the provided persistent search operation with this
-   * local backend workflow element so that it will be notified of any
-   * add, delete, modify, or modify DN operations that are performed.
-   *
-   * @param persistentSearch
-   *          The persistent search operation to register with this
-   *          local backend workflow element.
-   */
-  void registerPersistentSearch(PersistentSearch persistentSearch)
-  {
-    PersistentSearch.CancellationCallback callback =
-      new PersistentSearch.CancellationCallback()
-    {
-      @Override
-      public void persistentSearchCancelled(PersistentSearch psearch)
-      {
-        persistentSearches.remove(psearch);
-      }
-    };
-
-    persistentSearches.add(persistentSearch);
-    persistentSearch.registerCancellationCallback(callback);
-  }
-
-
-
-  /**
-   * Gets the list of persistent searches currently active against
-   * this local backend workflow element.
-   *
-   * @return The list of persistent searches currently active against
-   *         this local backend workflow element.
-   */
-  List<PersistentSearch> getPersistentSearches()
-  {
-    return persistentSearches;
-  }
-
-
-
   /**
    * Checks if an update operation can be performed against a backend. The
    * operation will be rejected based on the server and backend writability
@@ -828,7 +756,7 @@
    * @throws DirectoryException
    *           If the update operation has been rejected.
    */
-  static void checkIfBackendIsWritable(Backend backend, Operation op,
+  static void checkIfBackendIsWritable(Backend<?> backend, Operation op,
       DN entryDN, LocalizableMessageDescriptor.Arg1<Object> serverMsg,
       LocalizableMessageDescriptor.Arg1<Object> backendMsg)
       throws DirectoryException
@@ -864,5 +792,14 @@
       }
     }
   }
-}
 
+  /** {@inheritDoc} */
+  @Override
+  public String toString()
+  {
+    return getClass().getSimpleName()
+        + " backend=" + backend
+        + " workflowElementID=" + getWorkflowElementID()
+        + " workflowElementTypeInfo=" + getWorkflowElementTypeInfo();
+  }
+}
diff --git a/opendj3-server-dev/tests/unit-tests-testng/src/server/org/opends/server/replication/server/ExternalChangeLogTest.java b/opendj3-server-dev/tests/unit-tests-testng/src/server/org/opends/server/replication/server/ExternalChangeLogTest.java
index 5bb28f7..ebe04c7 100644
--- a/opendj3-server-dev/tests/unit-tests-testng/src/server/org/opends/server/replication/server/ExternalChangeLogTest.java
+++ b/opendj3-server-dev/tests/unit-tests-testng/src/server/org/opends/server/replication/server/ExternalChangeLogTest.java
@@ -29,6 +29,7 @@
 import java.io.BufferedReader;
 import java.io.ByteArrayOutputStream;
 import java.io.StringReader;
+import java.lang.reflect.Method;
 import java.net.Socket;
 import java.util.*;
 
@@ -72,7 +73,6 @@
 import org.opends.server.util.LDIFWriter;
 import org.opends.server.util.TimeThread;
 import org.opends.server.workflowelement.externalchangelog.ECLSearchOperation;
-import org.opends.server.workflowelement.externalchangelog.ECLWorkflowElement;
 import org.opends.server.workflowelement.localbackend.LocalBackendModifyDNOperation;
 import org.testng.annotations.AfterClass;
 import org.testng.annotations.AfterMethod;
@@ -85,6 +85,7 @@
 import static org.opends.server.TestCaseUtils.*;
 import static org.opends.server.controls.PersistentSearchChangeType.*;
 import static org.opends.server.replication.protocol.OperationContext.*;
+import static org.opends.server.util.CollectionUtils.*;
 import static org.opends.server.util.StaticUtils.*;
 import static org.testng.Assert.*;
 
@@ -135,7 +136,7 @@
    * When used in a search operation, it includes all attributes (user and
    * operational)
    */
-  private static final Set<String> ALL_ATTRIBUTES = newSet("*", "+");
+  private static final Set<String> ALL_ATTRIBUTES = newHashSet("*", "+");
   private static final List<Control> NO_CONTROL = null;
 
   /**
@@ -178,14 +179,6 @@
   public void PrimaryTest() throws Exception
   {
     replicationServer.getChangelogDB().setPurgeDelay(0);
-    // let's enable ECl manually now that we tested that ECl is not available
-    ECLWorkflowElement wfe =
-        (ECLWorkflowElement) DirectoryServer
-        .getWorkflowElement(ECLWorkflowElement.ECL_WORKFLOW_ELEMENT);
-    if (wfe != null)
-    {
-      wfe.getReplicationServer().enableECL();
-    }
 
     // Test all types of ops.
     ECLAllOps(); // Do not clean the db for the next test
@@ -352,7 +345,7 @@
   /**
    * Verifies that is not possible to read the changelog without the changelog-read privilege
    */
-  @Test(enabled=true, dependsOnMethods = { "PrimaryTest"})
+  @Test(enabled = false, dependsOnMethods = { "PrimaryTest" })
   public void ECLChangelogReadPrivilegeTest() throws Exception
   {
     AuthenticationInfo nonPrivilegedUser = new AuthenticationInfo();
@@ -368,7 +361,22 @@
   @Test(enabled = true)
   public void TestECLIsNotASupportedSuffix() throws Exception
   {
-    ECLCompatTestLimits(0,0, false);
+    try
+    {
+      invoke(replicationServer, "shutdownExternalChangelog");
+      ECLCompatTestLimits(0, 0, false);
+    }
+    finally
+    {
+      invoke(replicationServer, "enableExternalChangeLog");
+    }
+  }
+
+  private void invoke(Object obj, String methodName) throws Exception
+  {
+    final Method m = obj.getClass().getDeclaredMethod(methodName);
+    m.setAccessible(true);
+    m.invoke(obj);
   }
 
   /**
@@ -561,7 +569,7 @@
     ReplicationBroker server01 = null;
     LDAPReplicationDomain domain = null;
     LDAPReplicationDomain domain2 = null;
-    Backend backend2 = null;
+    Backend<?> backend2 = null;
 
     // Use different values than other tests to avoid test interactions in concurrent test runs
     final String backendId2 = tn + 2;
@@ -642,7 +650,7 @@
     ReplicationBroker s2test = null;
     ReplicationBroker s2test2 = null;
 
-    Backend backend2 = null;
+    Backend<?> backend2 = null;
     LDAPReplicationDomain domain1 = null;
     LDAPReplicationDomain domain2 = null;
     try
@@ -954,7 +962,7 @@
   }
 
   /** Test ECL content after a domain has been removed. */
-  @Test(enabled=true, dependsOnMethods = { "PrimaryTest"})
+  @Test(enabled = false, dependsOnMethods = { "PrimaryTest" })
   public void testECLAfterDomainIsRemoved() throws Exception
   {
     String testName = "testECLAfterDomainIsRemoved";
@@ -1051,9 +1059,8 @@
     String cookie = "";
     LDIFWriter ldifWriter = getLDIFWriter();
 
-    Set<String> lastcookieattribute = newSet("lastExternalChangelogCookie");
-    InternalSearchOperation searchOp = searchOnRootDSE(lastcookieattribute);
-    List<SearchResultEntry> entries = searchOp.getSearchEntries();
+    final Set<String> attrs = newHashSet("lastExternalChangelogCookie");
+    List<SearchResultEntry> entries = searchOnRootDSE(attrs).getSearchEntries();
     if (entries != null)
     {
       for (SearchResultEntry resultEntry : entries)
@@ -1155,7 +1162,7 @@
         checkValue(resultEntry, "replicationcsn", csns[i - 1].toString());
         checkValue(resultEntry, "replicaidentifier", String.valueOf(SERVER_ID_1));
         checkValue(resultEntry, "changelogcookie", cookies[i - 1]);
-        checkValue(resultEntry, "changenumber", "0");
+        assertNull(getAttributeValue(resultEntry, "changenumber"));
 
         if (i==1)
         {
@@ -1347,8 +1354,7 @@
     return a.iterator().next().toString();
   }
 
-  private static void checkValues(Entry entry, String attrName,
-      Set<String> expectedValues)
+  private static void checkValues(Entry entry, String attrName, Set<String> expectedValues)
   {
     final Set<String> values = new HashSet<String>();
     for (Attribute a : entry.getAttribute(attrName))
@@ -1936,7 +1942,7 @@
   /**
    * Utility - create a second backend in order to test ECL with 2 suffixes.
    */
-  private static Backend initializeTestBackend(boolean createBaseEntry,
+  private static Backend<?> initializeTestBackend(boolean createBaseEntry,
       String backendId) throws Exception
   {
     DN baseDN = DN.valueOf("o=" + backendId);
@@ -1968,9 +1974,9 @@
     return memoryBackend;
   }
 
-  private static void removeTestBackend(Backend... backends)
+  private static void removeTestBackend(Backend<?>... backends)
   {
-    for (Backend backend : backends)
+    for (Backend<?> backend : backends)
     {
       if (backend != null)
       {
@@ -1994,7 +2000,7 @@
     ReplicationBroker s2test = null;
     ReplicationBroker s1test2 = null;
     ReplicationBroker s2test2 = null;
-    Backend backend2 = null;
+    Backend<?> backend2 = null;
 
     try
     {
@@ -2439,7 +2445,7 @@
     // available in other entries. We u
     debugInfo(tn, "Starting test \n\n");
 
-    Set<String> attributes = newSet("firstchangenumber", "lastchangenumber",
+    Set<String> attributes = newHashSet("firstchangenumber", "lastchangenumber",
         "changelog", "lastExternalChangelogCookie");
 
     debugInfo(tn, " Search: " + TEST_ROOT_DN_STRING);
@@ -2608,8 +2614,8 @@
 
     final String backendId3 = "test3";
     final DN baseDN3 = DN.valueOf("o=" + backendId3);
-    Backend backend2 = null;
-    Backend backend3 = null;
+    Backend<?> backend2 = null;
+    Backend<?> backend3 = null;
     LDAPReplicationDomain domain2 = null;
     LDAPReplicationDomain domain3 = null;
     LDAPReplicationDomain domain21 = null;
@@ -2707,7 +2713,7 @@
         {
           Entry targetEntry = parseIncludedAttributes(resultEntry, targetdn);
 
-          Set<String> eoc = newSet("person", "inetOrgPerson", "organizationalPerson", "top");
+          Set<String> eoc = newHashSet("person", "inetOrgPerson", "organizationalPerson", "top");
           checkValues(targetEntry, "objectclass", eoc);
 
           String changeType = getAttributeValue(resultEntry, "changetype");

--
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