/*
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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 legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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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 legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* 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 2006-2008 Sun Microsystems, Inc.
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* Portions Copyright 2011-2014 ForgeRock AS
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* Portions Copyright 2013 ForgeRock AS
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*/
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package org.opends.server.plugins;
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import java.util.List;
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import java.util.Set;
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import java.util.TreeSet;
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import java.io.IOException;
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import org.forgerock.i18n.LocalizableMessage;
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import org.opends.server.admin.server.ConfigurationChangeListener;
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import org.opends.server.admin.std.meta.PluginCfgDefn;
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import org.opends.server.admin.std.server.ChangeNumberControlPluginCfg;
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import org.opends.server.admin.std.server.PluginCfg;
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import org.opends.server.api.plugin.DirectoryServerPlugin;
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import org.opends.server.api.plugin.PluginType;
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import org.opends.server.api.plugin.PluginResult;
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import org.opends.server.config.ConfigException;
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import org.forgerock.opendj.io.ASN1Writer;
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import org.opends.server.replication.common.CSN;
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import org.opends.server.replication.protocol.OperationContext;
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import org.opends.server.types.ConfigChangeResult;
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import org.opends.server.types.Control;
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import org.opends.server.types.ResultCode;
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import org.opends.server.types.operation.PostOperationAddOperation;
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import org.opends.server.types.operation.PostOperationDeleteOperation;
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import org.opends.server.types.operation.PostOperationModifyDNOperation;
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import org.opends.server.types.operation.PostOperationModifyOperation;
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import org.opends.server.types.operation.PostOperationOperation;
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import static org.opends.messages.PluginMessages.*;
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import static org.opends.server.util.ServerConstants.*;
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/**
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* This class implements a Directory Server plugin that will add the
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* replication CSN to a response whenever the CSN control is received.
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*/
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public final class ChangeNumberControlPlugin
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extends DirectoryServerPlugin<ChangeNumberControlPluginCfg>
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implements ConfigurationChangeListener<ChangeNumberControlPluginCfg>
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{
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/** The current configuration for this plugin. */
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private ChangeNumberControlPluginCfg currentConfig;
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/** The control used by this plugin. */
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public static class ChangeNumberControl extends Control
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{
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private CSN csn;
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/**
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* Constructs a new change number control.
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*
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* @param isCritical Indicates whether support for this control should be
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* considered a critical part of the server processing.
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* @param csn The CSN.
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*/
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public ChangeNumberControl(boolean isCritical, CSN csn)
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{
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super(OID_CSN_CONTROL, isCritical);
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this.csn = csn;
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}
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/**
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* Writes this control's value to an ASN.1 writer. The value (if any) must
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* be written as an ASN1OctetString.
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*
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* @param writer The ASN.1 writer to use.
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* @throws IOException If a problem occurs while writing to the stream.
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*/
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protected void writeValue(ASN1Writer writer) throws IOException {
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writer.writeOctetString(csn.toString());
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}
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/**
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* Retrieves the CSN.
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*
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* @return The CSN.
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*/
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public CSN getCSN()
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{
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return csn;
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}
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}
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/**
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* Creates a new instance of this Directory Server plugin. Every plugin must
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* implement a default constructor (it is the only one that will be used to
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* create plugins defined in the configuration), and every plugin constructor
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* must call <CODE>super()</CODE> as its first element.
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*/
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public ChangeNumberControlPlugin()
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{
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super();
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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 final void initializePlugin(Set<PluginType> pluginTypes,
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ChangeNumberControlPluginCfg configuration)
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throws ConfigException
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{
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currentConfig = configuration;
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configuration.addChangeNumberControlChangeListener(this);
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Set<PluginType> types = new TreeSet<PluginType>();
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// Make sure that the plugin has been enabled for the appropriate types.
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for (PluginType t : pluginTypes)
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{
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switch (t)
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{
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case POST_OPERATION_ADD:
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case POST_OPERATION_DELETE:
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case POST_OPERATION_MODIFY:
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case POST_OPERATION_MODIFY_DN:
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// These are acceptable.
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types.add(t);
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break;
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default:
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throw new ConfigException(ERR_PLUGIN_CHANGE_NUMBER_INVALID_PLUGIN_TYPE.get(t));
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}
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}
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if (types.size() != 4) {
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StringBuilder expected = new StringBuilder();
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expected.append(PluginType.POST_OPERATION_ADD);
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expected.append(", ");
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expected.append(PluginType.POST_OPERATION_DELETE);
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expected.append(", ");
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expected.append(PluginType.POST_OPERATION_MODIFY);
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expected.append(", ");
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expected.append(PluginType.POST_OPERATION_MODIFY_DN);
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StringBuilder found = new StringBuilder();
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boolean first = true;
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for (PluginType t : types) {
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if (first) {
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first = false;
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} else {
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found.append(", ");
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}
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found.append(t);
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}
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throw new ConfigException(ERR_PLUGIN_CHANGE_NUMBER_INVALID_PLUGIN_TYPE_LIST.get(
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found, expected));
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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 final void finalizePlugin()
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{
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currentConfig.removeChangeNumberControlChangeListener(this);
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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 final PluginResult.PostOperation
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doPostOperation(PostOperationAddOperation addOperation)
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{
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processCsnControl(addOperation);
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// We shouldn't ever need to return a non-success result.
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return PluginResult.PostOperation.continueOperationProcessing();
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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 final PluginResult.PostOperation
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doPostOperation(PostOperationDeleteOperation deleteOperation)
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{
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processCsnControl(deleteOperation);
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// We shouldn't ever need to return a non-success result.
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return PluginResult.PostOperation.continueOperationProcessing();
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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 final PluginResult.PostOperation
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doPostOperation(PostOperationModifyOperation modifyOperation)
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{
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processCsnControl(modifyOperation);
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// We shouldn't ever need to return a non-success result.
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return PluginResult.PostOperation.continueOperationProcessing();
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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 final PluginResult.PostOperation
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doPostOperation(PostOperationModifyDNOperation modifyDNOperation)
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{
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processCsnControl(modifyDNOperation);
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// We shouldn't ever need to return a non-success result.
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return PluginResult.PostOperation.continueOperationProcessing();
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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 boolean isConfigurationAcceptable(PluginCfg configuration,
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List<LocalizableMessage> unacceptableReasons)
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{
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ChangeNumberControlPluginCfg cfg =
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(ChangeNumberControlPluginCfg) configuration;
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return isConfigurationChangeAcceptable(cfg, unacceptableReasons);
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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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ChangeNumberControlPluginCfg configuration,
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List<LocalizableMessage> unacceptableReasons)
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{
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boolean configAcceptable = true;
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// Ensure that the set of plugin types contains only pre-operation add,
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// pre-operation modify, and pre-operation modify DN.
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for (PluginCfgDefn.PluginType pluginType : configuration.getPluginType())
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{
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switch (pluginType)
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{
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case POSTOPERATIONADD:
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case POSTOPERATIONDELETE:
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case POSTOPERATIONMODIFY:
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case POSTOPERATIONMODIFYDN:
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// These are acceptable.
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break;
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default:
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unacceptableReasons.add(ERR_PLUGIN_CHANGE_NUMBER_INVALID_PLUGIN_TYPE.get(pluginType));
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configAcceptable = false;
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}
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}
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return configAcceptable;
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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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ChangeNumberControlPluginCfg configuration)
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{
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currentConfig = configuration;
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return new ConfigChangeResult(ResultCode.SUCCESS, false);
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}
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/**
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* Retrieves the CSN from the synchronization context and sets the control
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* response in the operation.
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*
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* @param operation the operation
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*/
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private void processCsnControl(PostOperationOperation operation) {
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List<Control> requestControls = operation.getRequestControls();
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if ((requestControls != null) && (! requestControls.isEmpty())) {
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for (Control c : requestControls) {
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if (c.getOID().equals(OID_CSN_CONTROL)) {
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OperationContext ctx = (OperationContext)
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operation.getAttachment(OperationContext.SYNCHROCONTEXT);
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if (ctx != null) {
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CSN cn = ctx.getCSN();
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if (cn != null) {
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Control responseControl =
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new ChangeNumberControl(c.isCritical(), cn);
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operation.getResponseControls().add(responseControl);
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}
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}
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break;
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}
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}
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}
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}
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}
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