/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2009 Sun Microsystems, Inc.
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* Portions Copyright 2011 ForgeRock AS
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*/
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package org.opends.server.replication.server;
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import static org.opends.messages.ReplicationMessages.*;
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import static org.opends.server.loggers.ErrorLogger.logError;
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import static org.opends.server.loggers.debug.DebugLogger.getTracer;
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import static org.opends.server.util.StaticUtils.decodeUTF8;
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import static org.opends.server.util.StaticUtils.stackTraceToSingleLineString;
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import java.util.concurrent.locks.ReentrantReadWriteLock;
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import org.opends.messages.MessageBuilder;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.replication.common.ChangeNumber;
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import org.opends.server.types.DebugLogLevel;
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import com.sleepycat.je.*;
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/**
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* This class implements the interface between the underlying database
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* and the dbHandler class.
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* This is the only class that should have code using the BDB interfaces.
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*/
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public class DraftCNDB
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{
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private static final DebugTracer TRACER = getTracer();
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private Database db = null;
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private ReplicationDbEnv dbenv = null;
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private ReplicationServer replicationServer;
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// The lock used to provide exclusive access to the thread that
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// close the db (shutdown or clear).
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private ReentrantReadWriteLock dbCloseLock;
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/**
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* Creates a new database or open existing database that will be used
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* to store and retrieve changes from an LDAP server.
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* @param replicationServer The ReplicationServer that needs to be shutdown.
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* @param dbenv The Db environment to use to create the db.
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* @throws DatabaseException If a database problem happened.
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*/
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public DraftCNDB(
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ReplicationServer replicationServer,
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ReplicationDbEnv dbenv)
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throws DatabaseException
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{
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this.dbenv = dbenv;
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this.replicationServer = replicationServer;
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// Get or create the associated ReplicationServerDomain and Db.
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db = dbenv.getOrCreateDraftCNDb();
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dbCloseLock = new ReentrantReadWriteLock(true);
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}
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/**
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* Add an entry to the database.
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* @param draftCN the provided draftCN.
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*
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* @param value the provided value to be stored associated
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* with this draftCN.
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* @param domainBaseDN the provided domainBaseDn to be stored associated
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* with this draftCN.
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* @param changeNumber the provided replication change number to be
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* stored associated with this draftCN.
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*/
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public void addEntry(int draftCN, String value, String domainBaseDN,
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ChangeNumber changeNumber)
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{
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try
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{
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DatabaseEntry key = new ReplicationDraftCNKey(draftCN);
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DatabaseEntry data = new DraftCNData(draftCN,
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value, domainBaseDN, changeNumber);
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// Use a transaction so that we can override durability.
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Transaction txn = null;
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dbCloseLock.readLock().lock();
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try
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{
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txn = dbenv.beginTransaction();
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db.put(txn, key, data);
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txn.commit(Durability.COMMIT_WRITE_NO_SYNC);
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}
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finally
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{
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if (txn != null)
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{
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// No effect if txn has committed.
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try
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{
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txn.abort();
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}
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catch (Exception e)
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{
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// Ignored.
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}
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}
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dbCloseLock.readLock().unlock();
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}
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}
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catch (DatabaseException e)
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{
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replicationServer.handleUnexpectedDatabaseException(e);
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}
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}
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/**
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* Shutdown the database.
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*/
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public void shutdown()
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{
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try
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{
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dbCloseLock.writeLock().lock();
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try
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{
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db.close();
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}
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finally
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{
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dbCloseLock.writeLock().unlock();
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}
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}
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catch (DatabaseException e)
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{
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MessageBuilder mb = new MessageBuilder();
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mb.append(NOTE_EXCEPTION_CLOSING_DATABASE.get(this.toString()));
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mb.append(stackTraceToSingleLineString(e));
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logError(mb.toMessage());
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}
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}
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/**
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* Create a cursor that can be used to search or iterate on this DB.
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*
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* @param draftCN The draftCN from which the cursor must start.
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* @throws DatabaseException If a database error prevented the cursor
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* creation.
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* @throws Exception if the ReplServerDBCursor creation failed.
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* @return The ReplServerDBCursor.
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*/
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public DraftCNDBCursor openReadCursor(int draftCN)
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throws DatabaseException, Exception
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{
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return new DraftCNDBCursor(draftCN);
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}
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/**
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* Create a cursor that can be used to delete some record from this
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* ReplicationServer database.
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*
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* @throws DatabaseException If a database error prevented the cursor
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* creation.
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* @throws Exception if the ReplServerDBCursor creation failed.
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*
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* @return The ReplServerDBCursor.
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*/
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public DraftCNDBCursor openDeleteCursor()
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throws DatabaseException, Exception
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{
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return new DraftCNDBCursor();
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}
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private void closeLockedCursor(Cursor cursor)
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{
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try
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{
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if (cursor != null)
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{
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try
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{
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cursor.close();
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}
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catch (DatabaseException e)
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{
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// Ignore.
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}
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}
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}
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finally
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{
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dbCloseLock.readLock().unlock();
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}
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}
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/**
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* Read the first Change from the database, 0 when none.
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* @return the first draftCN.
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*/
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public int readFirstDraftCN()
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{
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try
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{
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dbCloseLock.readLock().lock();
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Cursor cursor = null;
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try
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{
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cursor = db.openCursor(null, null);
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DatabaseEntry key = new DatabaseEntry();
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DatabaseEntry entry = new DatabaseEntry();
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OperationStatus status = cursor.getFirst(key, entry, LockMode.DEFAULT);
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if (status != OperationStatus.SUCCESS)
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{
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/* database is empty */
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return 0;
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}
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return new Integer(decodeUTF8(key.getData()));
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}
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finally
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{
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closeLockedCursor(cursor);
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}
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}
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catch (DatabaseException e)
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{
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/* database is faulty */
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replicationServer.handleUnexpectedDatabaseException(e);
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return 0;
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}
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}
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/**
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* Return the record count.
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* @return the record count.
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*/
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public long count()
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{
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try
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{
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return db.count();
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}
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catch(Exception e)
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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return 0L;
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}
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/**
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* Read the last draftCN from the database.
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* @return the last draftCN.
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*/
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public int readLastDraftCN()
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{
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try
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{
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dbCloseLock.readLock().lock();
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Cursor cursor = null;
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try
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{
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cursor = db.openCursor(null, null);
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DatabaseEntry key = new DatabaseEntry();
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DatabaseEntry entry = new DatabaseEntry();
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OperationStatus status = cursor.getLast(key, entry, LockMode.DEFAULT);
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if (status != OperationStatus.SUCCESS)
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{
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/* database is empty */
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return 0;
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}
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return new Integer(decodeUTF8(key.getData()));
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}
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finally
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{
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closeLockedCursor(cursor);
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}
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}
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catch (DatabaseException e)
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{
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replicationServer.handleUnexpectedDatabaseException(e);
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return 0;
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public String toString()
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{
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return "DraftCNDB";
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}
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/**
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* This Class implements a cursor that can be used to browse the database.
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*/
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public class DraftCNDBCursor
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{
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private final Cursor cursor;
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// The transaction that will protect the actions done with the cursor
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// Will be let null for a read cursor
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// Will be set non null for a write cursor
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private final Transaction txn;
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private final DatabaseEntry key;
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private final DatabaseEntry entry;
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private DraftCNData seqnumData = null;
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private boolean isClosed = false;
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/**
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* Creates a cursor that can be used for browsing the db.
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*
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* @param startingDraftCN
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* the draftCN from which the cursor must start.
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* @throws Exception
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* when the startingDraftCN does not exist.
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*/
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private DraftCNDBCursor(int startingDraftCN) throws Exception
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{
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// For consistency with other constructor, we'll use a local here,
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// even though it's always null.
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final Transaction localTxn = null;
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Cursor localCursor = null;
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this.key = new ReplicationDraftCNKey(startingDraftCN);
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this.entry = new DatabaseEntry();
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// Take the lock. From now on, whatever error that happen in the life
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// of this cursor should end by unlocking that lock. We must also
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// unlock it when throwing an exception.
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dbCloseLock.readLock().lock();
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try
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{
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localCursor = db.openCursor(localTxn, null);
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if (startingDraftCN >= 0)
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{
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if (localCursor.getSearchKey(
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key, entry, LockMode.DEFAULT) != OperationStatus.SUCCESS)
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{
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// We could not move the cursor to the expected startingChangeNumber
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if (localCursor.getSearchKeyRange(key, entry,
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LockMode.DEFAULT) != OperationStatus.SUCCESS)
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{
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// We could not even move the cursor closed to it => failure
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throw new Exception("ChangeLog Draft Change Number "
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+ startingDraftCN + " is not available");
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}
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else
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{
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if (localCursor.getPrev(key, entry, LockMode.DEFAULT)
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!= OperationStatus.SUCCESS)
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{
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localCursor.close();
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localCursor = db.openCursor(localTxn, null);
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}
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else
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{
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seqnumData = new DraftCNData(entry.getData());
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}
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}
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}
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else
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{
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seqnumData = new DraftCNData(entry.getData());
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}
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}
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this.txn = localTxn;
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this.cursor = localCursor;
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}
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catch (Exception e)
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{
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// Unlocking is required before throwing any exception
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closeLockedCursor(localCursor);
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throw e;
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}
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}
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private DraftCNDBCursor() throws Exception
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{
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Transaction localTxn = null;
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Cursor localCursor = null;
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this.key = new DatabaseEntry();
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this.entry = new DatabaseEntry();
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// We'll go on only if no close or no clear is running
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dbCloseLock.readLock().lock();
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try
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{
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// Create the transaction that will protect whatever done with this
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// write cursor.
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localTxn = dbenv.beginTransaction();
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localCursor = db.openCursor(localTxn, null);
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this.txn = localTxn;
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this.cursor = localCursor;
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}
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catch (Exception e)
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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try
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{
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closeLockedCursor(localCursor);
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}
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catch (DatabaseException ignored)
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{
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// Ignore.
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TRACER.debugCaught(DebugLogLevel.ERROR, ignored);
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}
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if (localTxn != null)
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{
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try
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{
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localTxn.abort();
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}
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catch (DatabaseException ignored)
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{
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// Ignore.
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TRACER.debugCaught(DebugLogLevel.ERROR, ignored);
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}
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}
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throw e;
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}
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}
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/**
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* Close the ReplicationServer Cursor.
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*/
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public void close()
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{
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synchronized (this)
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{
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if (isClosed)
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{
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return;
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}
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isClosed = true;
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}
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closeLockedCursor(cursor);
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if (txn != null)
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{
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try
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{
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txn.commit();
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}
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catch (DatabaseException e)
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{
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replicationServer.handleUnexpectedDatabaseException(e);
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}
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}
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}
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/**
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* Abort the Cursor after a Deadlock Exception.
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* This method catch and ignore the DeadlockException because
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* this must be done when aborting a cursor after a DeadlockException
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* (per the Cursor documentation).
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* This should not be used in any other case.
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*/
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public void abort()
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{
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synchronized (this)
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{
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if (isClosed)
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{
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return;
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}
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isClosed = true;
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}
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closeLockedCursor(cursor);
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if (txn != null)
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{
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try
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{
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txn.abort();
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}
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catch (DatabaseException e)
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{
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replicationServer.handleUnexpectedDatabaseException(e);
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}
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}
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}
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/**
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* Getter for the value field of the current cursor.
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* @return The current value field.
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*/
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public String currentValue()
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{
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try
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{
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if (seqnumData != null)
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{
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return seqnumData.getValue();
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}
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}
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catch(Exception e)
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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return null;
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}
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/**
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* Getter for the serviceID field of the current cursor.
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* @return The current serviceID.
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*/
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public String currentServiceID()
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{
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try
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{
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if (seqnumData != null)
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{
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return seqnumData.getServiceID();
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}
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}
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catch(Exception e)
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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return null;
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}
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/**
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* Getter for the integer value of the current cursor, representing
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* the current DraftChangeNumber being processed.
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*
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* @return the current DraftCN as an integer.
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*/
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public int currentKey()
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{
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try
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{
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String str = decodeUTF8(key.getData());
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int draftCN = new Integer(str);
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return draftCN;
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}
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catch(Exception e)
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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return -1;
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}
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/**
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* Returns the replication changeNumber associated with the current key.
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* @return the replication changeNumber
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*/
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public ChangeNumber currentChangeNumber()
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{
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try
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{
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if (seqnumData != null)
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{
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return seqnumData.getChangeNumber();
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}
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}
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catch(Exception e)
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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return null;
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}
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/**
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* Go to the next record on the cursor.
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* @return the next record on this cursor.
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* @throws DatabaseException a.
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*/
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public boolean next() throws DatabaseException
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{
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OperationStatus status = cursor.getNext(key, entry, LockMode.DEFAULT);
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if (status != OperationStatus.SUCCESS)
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{
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seqnumData = null;
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return false;
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}
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try {
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seqnumData = new DraftCNData(entry.getData());
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}
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catch(Exception e)
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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return true;
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}
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/**
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* Delete the record at the current cursor position.
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*
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* @throws DatabaseException In case of database problem.
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*/
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public void delete() throws DatabaseException
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{
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cursor.delete();
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}
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/**
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* Returns the current key associated with this cursor.
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*
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* @return The current key associated with this cursor.
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*/
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public DatabaseEntry getKey()
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{
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return key;
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}
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}
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/**
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* Clears this change DB from the changes it contains.
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*
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* @throws Exception Throws an exception it occurs.
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* @throws DatabaseException Throws a DatabaseException when it occurs.
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*/
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public void clear() throws Exception, DatabaseException
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{
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// The coming users will be blocked until the clear is done
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dbCloseLock.writeLock().lock();
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try
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{
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String dbName = db.getDatabaseName();
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// Closing is requested by the Berkeley DB before truncate
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db.close();
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// Clears the changes
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dbenv.clearDb(dbName);
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// RE-create the db
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db = dbenv.getOrCreateDraftCNDb();
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}
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catch(Exception e)
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{
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MessageBuilder mb = new MessageBuilder();
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mb.append(ERR_ERROR_CLEARING_DB.get(this.toString(),
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e.getMessage() + " " +
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stackTraceToSingleLineString(e)));
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logError(mb.toMessage());
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}
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finally
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{
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// Relax the waiting users
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dbCloseLock.writeLock().unlock();
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}
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}
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}
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