/*
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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 2009 Sun Microsystems, Inc.
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* Portions Copyright 2011-2015 ForgeRock AS
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*/
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package org.opends.server.replication.plugin;
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import java.util.Map.Entry;
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import java.util.NoSuchElementException;
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import java.util.TreeMap;
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import org.opends.server.replication.common.CSN;
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import org.opends.server.replication.common.CSNGenerator;
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import org.opends.server.replication.protocol.LDAPUpdateMsg;
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import org.opends.server.replication.protocol.ReplicaOfflineMsg;
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import org.opends.server.replication.protocol.UpdateMsg;
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import org.opends.server.replication.service.ReplicationDomain;
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import org.opends.server.types.operation.PluginOperation;
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/**
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* This class is used to store the list of local operations currently
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* in progress and not yet committed in the database.
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* <p>
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* It is used to make sure that operations are sent to the Replication Server
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* in the order defined by their CSN. It is also used to update the ServerState
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* at the appropriate time.
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* <p>
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* An object of this class is instantiated for each ReplicationDomain.
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*/
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class PendingChanges
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{
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/** A map used to store the pending changes. */
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private final TreeMap<CSN, PendingChange> pendingChanges = new TreeMap<>();
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/**
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* The {@link CSNGenerator} to use to create new unique CSNs
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* for each operation done on the replication domain.
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*/
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private final CSNGenerator csnGenerator;
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/** The ReplicationDomain that will be used to send UpdateMsg. */
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private final ReplicationDomain domain;
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private boolean recoveringOldChanges;
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/**
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* Creates a new PendingChanges using the provided CSNGenerator.
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*
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* @param csnGenerator The CSNGenerator to use to create new unique CSNs.
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* @param domain The ReplicationDomain that will be used to send UpdateMsg.
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*/
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PendingChanges(CSNGenerator csnGenerator, ReplicationDomain domain)
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{
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this.csnGenerator = csnGenerator;
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this.domain = domain;
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}
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/**
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* Remove and return an update form the pending changes list.
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*
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* @param csn
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* The CSN of the update to remove.
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*/
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synchronized void remove(CSN csn)
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{
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pendingChanges.remove(csn);
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}
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/**
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* Returns the number of update currently in the list.
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*
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* @return The number of update currently in the list.
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*/
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int size()
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{
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return pendingChanges.size();
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}
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/**
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* Mark an update message as committed.
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*
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* @param csn The CSN of the update message that must be set as committed.
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* @param msg The message associated to the update.
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*/
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private synchronized void commit(CSN csn, LDAPUpdateMsg msg)
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{
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final PendingChange curChange = pendingChanges.get(csn);
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if (curChange == null)
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{
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throw new NoSuchElementException();
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}
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curChange.setCommitted(true);
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curChange.setMsg(msg);
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}
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/**
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* Add a new UpdateMsg to the pending list from the provided local operation.
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*
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* @param operation The local operation for which an UpdateMsg must
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* be added in the pending list.
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* @return The CSN now associated to the operation.
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*/
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synchronized CSN putLocalOperation(PluginOperation operation)
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{
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final CSN csn = csnGenerator.newCSN();
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if (!operation.isSynchronizationOperation())
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{
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pendingChanges.put(csn, new PendingChange(csn, operation, null));
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}
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return csn;
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}
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/**
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* Add a replica offline message to the pending list.
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*/
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public synchronized void putReplicaOfflineMsg()
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{
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final CSN offlineCSN = csnGenerator.newCSN();
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final PendingChange pendingChange =
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new PendingChange(offlineCSN, null, new ReplicaOfflineMsg(offlineCSN));
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pendingChange.setCommitted(true);
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pendingChanges.put(offlineCSN, pendingChange);
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pushCommittedChanges();
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}
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/**
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* Push all committed local changes to the replicationServer service.
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*/
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synchronized void pushCommittedChanges()
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{
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// peek the oldest change
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Entry<CSN, PendingChange> firstEntry = pendingChanges.firstEntry();
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if (firstEntry == null)
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{
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return;
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}
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PendingChange firstChange = firstEntry.getValue();
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while (firstChange != null && firstChange.isCommitted())
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{
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final PluginOperation op = firstChange.getOp();
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final UpdateMsg msg = firstChange.getMsg();
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if (msg instanceof LDAPUpdateMsg
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&& op != null
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&& !op.isSynchronizationOperation())
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{
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if (!recoveringOldChanges)
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{
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domain.publish(msg);
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}
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else
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{
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// do not push updates until the RS catches up.
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// @see #setRecovering(boolean)
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domain.getServerState().update(msg.getCSN());
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}
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}
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else if (msg instanceof ReplicaOfflineMsg)
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{
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domain.publish(msg);
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}
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// false warning: firstEntry will not be null if firstChange is not null
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pendingChanges.remove(firstEntry.getKey());
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// peek the oldest change
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firstEntry = pendingChanges.firstEntry();
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firstChange = firstEntry != null ? firstEntry.getValue() : null;
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}
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}
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/**
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* Mark an update message as committed, then
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* push all committed local changes to the replicationServer service
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* in a single atomic operation.
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*
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* @param csn The CSN of the update message that must be set as committed.
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* @param msg The message associated to the update.
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*/
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synchronized void commitAndPushCommittedChanges(CSN csn, LDAPUpdateMsg msg)
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{
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commit(csn, msg);
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pushCommittedChanges();
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}
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/**
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* Set the PendingChangesList structure in a mode where it is waiting for the
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* RS to receive all the previous changes to be sent before starting to
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* process the changes normally. In this mode, The Domain does not publish the
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* changes from the pendingChanges because there are older changes that need
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* to be published before.
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*
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* @param recovering
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* The recovering status that must be set.
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*/
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public void setRecovering(boolean recovering)
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{
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recoveringOldChanges = recovering;
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}
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/**
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* Allows to update the recovery situation by comparing the CSN of the last
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* change that was sent to the ReplicationServer with the CSN of the last
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* operation that was taken out of the PendingChanges list. If the two match
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* then the recovery is completed and normal procedure can restart. Otherwise
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* the RSUpdater thread must continue to look for older changes and no changes
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* can be committed from the pendingChanges list.
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*
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* @param recovered
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* The CSN of the last change that was published to the
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* ReplicationServer.
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* @return A boolean indicating if the recovery is completed (false) or must
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* continue (true).
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*/
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synchronized boolean recoveryUntil(CSN recovered)
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{
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final CSN lastLocalChange = domain.getLastLocalChange();
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if (recovered != null && recovered.isNewerThanOrEqualTo(lastLocalChange))
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{
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recoveringOldChanges = false;
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}
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return recoveringOldChanges;
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}
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}
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