/*
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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 2008-2009 Sun Microsystems, Inc.
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*/
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package org.opends.server.workflowelement.localbackend;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.TreeMap;
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import java.util.concurrent.CopyOnWriteArrayList;
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import org.opends.messages.Message;
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import org.opends.server.admin.server.ConfigurationChangeListener;
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import org.opends.server.admin.server.ServerManagementContext;
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import org.opends.server.admin.std.server.BackendCfg;
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import org.opends.server.admin.std.server.LocalBackendWorkflowElementCfg;
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import org.opends.server.admin.std.server.RootCfg;
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import org.opends.server.api.Backend;
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import org.opends.server.config.ConfigException;
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import org.opends.server.core.AddOperation;
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import org.opends.server.core.BindOperation;
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import org.opends.server.core.CompareOperation;
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import org.opends.server.core.DeleteOperation;
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import org.opends.server.core.DirectoryServer;
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import org.opends.server.core.ModifyDNOperation;
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import org.opends.server.core.ModifyOperation;
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import org.opends.server.core.PersistentSearch;
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import org.opends.server.core.SearchOperation;
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import org.opends.server.types.*;
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import org.opends.server.workflowelement.LeafWorkflowElement;
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import static org.opends.server.config.ConfigConstants.*;
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/**
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* This class defines a local backend workflow element; e-g an entity that
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* handle the processing of an operation against a local backend.
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*/
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public class LocalBackendWorkflowElement extends
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LeafWorkflowElement<LocalBackendWorkflowElementCfg>
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implements ConfigurationChangeListener<LocalBackendWorkflowElementCfg>
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{
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// the backend associated with the local workflow element
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private Backend backend;
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// the set of local backend workflow elements registered with the server
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private static TreeMap<String, LocalBackendWorkflowElement>
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registeredLocalBackends =
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new TreeMap<String, LocalBackendWorkflowElement>();
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// The set of persistent searches registered with this work flow
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// element.
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private final List<PersistentSearch> persistentSearches =
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new CopyOnWriteArrayList<PersistentSearch>();
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// a lock to guarantee safe concurrent access to the registeredLocalBackends
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// variable
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private static final Object registeredLocalBackendsLock = new Object();
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// A string indicating the type of the workflow element.
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private final String BACKEND_WORKFLOW_ELEMENT = "Backend";
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/**
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* Creates a new instance of the local backend workflow element.
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*/
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public LocalBackendWorkflowElement()
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{
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// There is nothing to do in this constructor.
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}
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/**
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* Initializes a new instance of the local backend workflow element.
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* This method is intended to be called by DirectoryServer when
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* workflow configuration mode is auto as opposed to
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* initializeWorkflowElement which is invoked when workflow
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* configuration mode is manual.
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*
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* @param workflowElementID the workflow element identifier
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* @param backend the backend associated to that workflow element
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*/
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private void initialize(String workflowElementID, Backend backend)
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{
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// Initialize the workflow ID
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super.initialize(workflowElementID, BACKEND_WORKFLOW_ELEMENT);
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this.backend = backend;
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if (this.backend != null)
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{
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setPrivate(this.backend.isPrivateBackend());
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}
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}
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/**
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* Initializes a new instance of the local backend workflow element.
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* This method is intended to be called by DirectoryServer when
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* workflow configuration mode is manual as opposed to
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* initialize(String,Backend) which is invoked when workflow
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* configuration mode is auto.
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*
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* @param configuration The configuration for this local backend
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* workflow element.
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*
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* @throws ConfigException If there is a problem with the provided
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* configuration.
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*
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* @throws InitializationException If an error occurs while trying
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* to initialize this workflow
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* element that is not related to
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* the provided configuration.
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*/
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public void initializeWorkflowElement(
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LocalBackendWorkflowElementCfg configuration
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) throws ConfigException, InitializationException
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{
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configuration.addLocalBackendChangeListener(this);
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// Read configuration and apply changes.
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processWorkflowElementConfig(configuration, true);
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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 void finalizeWorkflowElement()
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{
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// null all fields so that any use of the finalized object will raise
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// an NPE
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super.initialize(null, null);
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backend = null;
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// Cancel all persistent searches.
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for (PersistentSearch psearch : persistentSearches) {
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psearch.cancel();
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}
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persistentSearches.clear();
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isConfigurationChangeAcceptable(
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LocalBackendWorkflowElementCfg configuration,
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List<Message> unacceptableReasons
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)
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{
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boolean isAcceptable =
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processWorkflowElementConfig(configuration, false);
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return isAcceptable;
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}
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/**
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* {@inheritDoc}
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*/
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public ConfigChangeResult applyConfigurationChange(
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LocalBackendWorkflowElementCfg configuration
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)
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{
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// Returned result.
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ConfigChangeResult changeResult = new ConfigChangeResult(
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ResultCode.SUCCESS, false, new ArrayList<Message>()
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);
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processWorkflowElementConfig(configuration, true);
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return changeResult;
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}
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/**
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* Parses the provided configuration and configure the workflow element.
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*
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* @param configuration The new configuration containing the changes.
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* @param applyChanges If true then take into account the new configuration.
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*
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* @return <code>true</code> if the configuration is acceptable.
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*/
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private boolean processWorkflowElementConfig(
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LocalBackendWorkflowElementCfg configuration,
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boolean applyChanges
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)
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{
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// returned status
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boolean isAcceptable = true;
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// If the workflow element is disabled then do nothing. Note that the
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// configuration manager could have finalized the object right before.
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if (configuration.isEnabled())
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{
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// Read configuration.
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String newBackendID = configuration.getBackend();
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Backend newBackend = DirectoryServer.getBackend(newBackendID);
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// If the backend is null (i.e. not found in the list of
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// registered backends, this is probably because we are looking
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// for the config backend
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if (newBackend == null) {
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ServerManagementContext context = ServerManagementContext.getInstance();
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RootCfg root = context.getRootConfiguration();
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try {
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BackendCfg backendCfg = root.getBackend(newBackendID);
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if (backendCfg.getBaseDN().contains(DN.decode(DN_CONFIG_ROOT))) {
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newBackend = DirectoryServer.getConfigHandler();
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}
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} catch (Exception ex) {
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// Unable to find the backend
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newBackend = null;
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}
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}
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// Get the new configuration
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if (applyChanges)
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{
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super.initialize(
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configuration.getWorkflowElementId(), BACKEND_WORKFLOW_ELEMENT);
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backend = newBackend;
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if (backend != null)
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{
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setPrivate(backend.isPrivateBackend());
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}
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}
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}
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return isAcceptable;
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}
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/**
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* Creates and registers a local backend with the server.
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*
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* @param workflowElementID the identifier of the workflow element to create
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* @param backend the backend to associate with the local backend
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* workflow element
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*
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* @return the existing local backend workflow element if it was
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* already created or a newly created local backend workflow
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* element.
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*/
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public static LocalBackendWorkflowElement createAndRegister(
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String workflowElementID,
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Backend backend)
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{
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LocalBackendWorkflowElement localBackend = null;
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// If the requested workflow element does not exist then create one.
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localBackend = registeredLocalBackends.get(workflowElementID);
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if (localBackend == null)
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{
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localBackend = new LocalBackendWorkflowElement();
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localBackend.initialize(workflowElementID, backend);
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// store the new local backend in the list of registered backends
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registerLocalBackend(localBackend);
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}
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return localBackend;
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}
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/**
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* Removes a local backend that was registered with the server.
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*
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* @param workflowElementID the identifier of the workflow element to remove
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*/
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public static void remove(String workflowElementID)
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{
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deregisterLocalBackend(workflowElementID);
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}
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/**
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* Removes all the local backends that were registered with the server.
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* This function is intended to be called when the server is shutting down.
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*/
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public static void removeAll()
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{
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synchronized (registeredLocalBackendsLock)
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{
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for (LocalBackendWorkflowElement localBackend:
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registeredLocalBackends.values())
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{
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deregisterLocalBackend(localBackend.getWorkflowElementID());
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}
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}
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}
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/**
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* Registers a local backend with the server.
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*
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* @param localBackend the local backend to register with the server
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*/
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private static void registerLocalBackend(
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LocalBackendWorkflowElement localBackend)
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{
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synchronized (registeredLocalBackendsLock)
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{
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String localBackendID = localBackend.getWorkflowElementID();
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LocalBackendWorkflowElement existingLocalBackend =
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registeredLocalBackends.get(localBackendID);
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if (existingLocalBackend == null)
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{
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TreeMap<String, LocalBackendWorkflowElement> newLocalBackends =
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new TreeMap
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<String, LocalBackendWorkflowElement>(registeredLocalBackends);
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newLocalBackends.put(localBackendID, localBackend);
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registeredLocalBackends = newLocalBackends;
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}
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}
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}
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/**
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* Deregisters a local backend with the server.
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*
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* @param workflowElementID the identifier of the workflow element to remove
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*/
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private static void deregisterLocalBackend(String workflowElementID)
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{
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synchronized (registeredLocalBackendsLock)
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{
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LocalBackendWorkflowElement existingLocalBackend =
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registeredLocalBackends.get(workflowElementID);
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if (existingLocalBackend != null)
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{
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TreeMap<String, LocalBackendWorkflowElement> newLocalBackends =
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new TreeMap<String, LocalBackendWorkflowElement>(
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registeredLocalBackends);
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newLocalBackends.remove(workflowElementID);
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registeredLocalBackends = newLocalBackends;
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}
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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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public void execute(Operation operation) throws CanceledOperationException {
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switch (operation.getOperationType())
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{
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case BIND:
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LocalBackendBindOperation bindOperation =
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new LocalBackendBindOperation((BindOperation) operation);
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bindOperation.processLocalBind(this);
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break;
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case SEARCH:
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LocalBackendSearchOperation searchOperation =
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new LocalBackendSearchOperation((SearchOperation) operation);
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searchOperation.processLocalSearch(this);
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break;
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case ADD:
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LocalBackendAddOperation addOperation =
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new LocalBackendAddOperation((AddOperation) operation);
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addOperation.processLocalAdd(this);
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break;
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case DELETE:
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LocalBackendDeleteOperation deleteOperation =
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new LocalBackendDeleteOperation((DeleteOperation) operation);
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deleteOperation.processLocalDelete(this);
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break;
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case MODIFY:
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LocalBackendModifyOperation modifyOperation =
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new LocalBackendModifyOperation((ModifyOperation) operation);
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modifyOperation.processLocalModify(this);
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break;
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case MODIFY_DN:
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LocalBackendModifyDNOperation modifyDNOperation =
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new LocalBackendModifyDNOperation((ModifyDNOperation) operation);
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modifyDNOperation.processLocalModifyDN(this);
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break;
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case COMPARE:
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LocalBackendCompareOperation compareOperation =
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new LocalBackendCompareOperation((CompareOperation) operation);
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compareOperation.processLocalCompare(this);
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break;
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case ABANDON:
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// There is no processing for an abandon operation.
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break;
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default:
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throw new AssertionError("Attempted to execute an invalid operation " +
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"type: " + operation.getOperationType() +
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" (" + operation + ")");
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}
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}
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/**
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* Attaches the current local operation to the global operation so that
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* operation runner can execute local operation post response later on.
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*
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* @param <O> subtype of Operation
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* @param <L> subtype of LocalBackendOperation
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* @param globalOperation the global operation to which local operation
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* should be attached to
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* @param currentLocalOperation the local operation to attach to the global
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* operation
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*/
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@SuppressWarnings("unchecked")
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public static final <O extends Operation,L> void
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attachLocalOperation (O globalOperation, L currentLocalOperation)
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{
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List<?> existingAttachment =
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(List<?>) globalOperation.getAttachment(Operation.LOCALBACKENDOPERATIONS);
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List<L> newAttachment = new ArrayList<L>();
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if (existingAttachment != null)
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{
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// This line raises an unchecked conversion warning.
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// There is nothing we can do to prevent this warning
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// so let's get rid of it since we know the cast is safe.
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newAttachment.addAll ((List<L>) existingAttachment);
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}
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newAttachment.add (currentLocalOperation);
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globalOperation.setAttachment(Operation.LOCALBACKENDOPERATIONS,
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newAttachment);
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}
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/**
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* Gets the backend associated with this local backend workflow
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* element.
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*
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* @return The backend associated with this local backend workflow
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* element.
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*/
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public Backend getBackend()
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{
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return backend;
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}
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/**
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* Registers the provided persistent search operation with this
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* local backend workflow element so that it will be notified of any
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* add, delete, modify, or modify DN operations that are performed.
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*
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* @param persistentSearch
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* The persistent search operation to register with this
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* local backend workflow element.
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*/
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void registerPersistentSearch(PersistentSearch persistentSearch)
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{
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PersistentSearch.CancellationCallback callback =
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new PersistentSearch.CancellationCallback()
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{
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public void persistentSearchCancelled(PersistentSearch psearch)
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{
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persistentSearches.remove(psearch);
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}
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};
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persistentSearches.add(persistentSearch);
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persistentSearch.registerCancellationCallback(callback);
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}
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/**
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* Gets the list of persistent searches currently active against
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* this local backend workflow element.
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*
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* @return The list of persistent searches currently active against
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* this local backend workflow element.
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*/
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List<PersistentSearch> getPersistentSearches()
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{
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return persistentSearches;
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}
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}
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