/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2007-2009 Sun Microsystems, Inc.
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* Portions Copyright 2013-2016 ForgeRock AS.
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* Portions Copyright 2026 3A Systems, LLC.
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*/
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package org.opends.server.replication.plugin;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import java.util.SortedMap;
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import java.util.SortedSet;
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import java.util.TreeMap;
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import java.util.TreeSet;
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import java.util.concurrent.ConcurrentSkipListSet;
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import java.util.concurrent.locks.ReentrantLock;
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import java.util.concurrent.locks.ReentrantReadWriteLock;
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import net.jcip.annotations.GuardedBy;
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import org.forgerock.opendj.ldap.DN;
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import org.opends.server.core.AddOperation;
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import org.opends.server.core.DeleteOperation;
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import org.opends.server.core.ModifyDNOperationBasis;
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import org.opends.server.core.ModifyOperation;
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import org.opends.server.replication.common.CSN;
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import org.opends.server.replication.common.ServerState;
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import org.opends.server.replication.protocol.AddMsg;
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import org.opends.server.replication.protocol.DeleteMsg;
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import org.opends.server.replication.protocol.LDAPUpdateMsg;
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import org.opends.server.replication.protocol.ModifyDNMsg;
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import org.opends.server.replication.protocol.ModifyMsg;
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import org.opends.server.replication.protocol.OperationContext;
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import org.opends.server.types.Operation;
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/**
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* This class is used to store the list of remote changes received
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* from a replication server and that are either currently being replayed
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* or that are waiting for being replayed.
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*
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* It is used to know when the ServerState must be updated and to compute
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* the dependencies between operations.
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*
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* One of this object is instantiated for each ReplicationDomain.
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*/
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final class RemotePendingChanges
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{
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/** A map used to store the pending changes. */
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@GuardedBy("pendingChangesLock")
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private final SortedMap<CSN, PendingChange> pendingChanges = new TreeMap<>();
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/**
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* A sorted set containing the list of PendingChanges that have
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* not been replayed correctly because they are dependent on
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* another change to be completed.
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*/
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@GuardedBy("dependentChangesLock")
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private final SortedSet<PendingChange> dependentChanges = new TreeSet<>();
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/**
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* {@code activeAndDependentChanges} also contains changes discovered to be dependent
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* on currently in progress changes.
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*/
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private final ConcurrentSkipListSet<PendingChange> activeAndDependentChanges = new ConcurrentSkipListSet<>();
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private final ReentrantReadWriteLock pendingChangesLock = new ReentrantReadWriteLock(true);
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private final ReentrantReadWriteLock.ReadLock pendingChangesReadLock = pendingChangesLock.readLock();
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private final ReentrantReadWriteLock.WriteLock pendingChangesWriteLock = pendingChangesLock.writeLock();
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private final ReentrantLock dependentChangesLock = new ReentrantLock();
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/** The ServerState that will be updated when LDAPUpdateMsg are fully replayed. */
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private final ServerState state;
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/**
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* How many of the changes listed here have a replay failure recorded against them.
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* <p>
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* A change is counted from its first failed replay until it leaves this map, and it is
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* what tells a change which can not be applied from a backend which is serving again:
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* an outage fails everything in flight, while a change which can never be applied here
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* fails alone, among changes which replay perfectly well. The session restart backoff
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* reads it, so that the successful replays which surround a failing change do not keep
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* resetting the wait this domain has reached on it (issue #889).
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*/
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@GuardedBy("pendingChangesLock")
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private int failingChanges;
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/**
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* Creates a new RemotePendingChanges using the provided ServerState.
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*
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* @param state The ServerState that will be updated when LDAPUpdateMsg
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* have been fully replayed.
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*/
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public RemotePendingChanges(ServerState state)
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{
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this.state = state;
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}
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/**
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* Returns the number of changes waiting to be replayed.
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*
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* @return The number of changes waiting to be replayed
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*/
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public int getQueueSize()
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{
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pendingChangesReadLock.lock();
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try
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{
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return pendingChanges.size();
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}
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finally
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{
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pendingChangesReadLock.unlock();
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}
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}
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/**
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* Returns the number of changes actively being replayed.
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* <p>
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* A change whose replay failed counts here until it is applied or given up on: it stays
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* a dependency of the changes which follow it, since a change which is not in the data
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* is exactly what they must wait for, and the delivery which comes next takes it over.
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*
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* @return the number of changes actively being replayed.
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*/
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public int changesInProgressSize()
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{
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return activeAndDependentChanges.size();
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}
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/**
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* Returns the number of changes depending on other changes.
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*
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* @return the number of changes depending on other changes.
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*/
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public int getDependentChangesSize()
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{
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dependentChangesLock.lock();
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try
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{
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return dependentChanges.size();
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}
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finally
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{
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dependentChangesLock.unlock();
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}
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}
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/**
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* Add a new LDAPUpdateMsg that was received from the replication server
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* to the pendingList.
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* <p>
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* A change which is already listed and which a replay thread owns - it is being
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* replayed, it waits for the change it depends on, or it has been replayed and waits
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* for the changes before it - is left alone: that copy knows what this one does not,
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* and replaying it again is exactly what the duplicate check is there to prevent
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* (OPENDJ-1115).
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* <p>
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* A change which is listed but which no replay thread owns is taken over by this
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* delivery: it is the one to replay, and the copy which may still wait in the replay
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* queue is dropped by {@link #markInProgress(LDAPUpdateMsg)}. That is a change whose
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* replay failed - it is deliberately left out of the ServerState, so the replication
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* server sends it again over the session which was restarted (issue #889) - and it is
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* also, harmlessly, a change which was listed a moment ago by a delivery no replay
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* thread has picked up yet: the two deliveries carry the same change, and the last one
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* listed is the one replayed.
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* <p>
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* The failures the change went through are kept, whichever delivery replays it: they
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* are what has this replica eventually give up on a change it can not apply.
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*
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* @param update The LDAPUpdateMsg that was received from the replication
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* server and that will be added to the pending list.
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* @return {@code false} if the update was already registered in the pending
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* changes and is owned by a replay thread.
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*/
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public boolean putRemoteUpdate(LDAPUpdateMsg update)
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{
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pendingChangesWriteLock.lock();
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try
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{
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final CSN csn = update.getCSN();
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final PendingChange listed = pendingChanges.get(csn);
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if (listed == null)
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{
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pendingChanges.put(csn, new PendingChange(csn, null, update));
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return true;
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}
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if (listed.isCommitted() || listed.isOwned())
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{
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return false;
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}
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listed.setMsg(update);
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return true;
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}
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finally
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{
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pendingChangesWriteLock.unlock();
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}
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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
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* The CSN of the update message that must be set as committed.
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*/
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public void commit(CSN csn)
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{
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pendingChangesWriteLock.lock();
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try
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{
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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.setOwned(false);
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activeAndDependentChanges.remove(curChange);
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final Iterator<PendingChange> it = pendingChanges.values().iterator();
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while (it.hasNext())
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{
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PendingChange pendingChange = it.next();
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if (!pendingChange.isCommitted())
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{
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break;
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}
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if (pendingChange.getMsg().contributesToDomainState())
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{
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state.update(pendingChange.getCSN());
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}
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if (pendingChange.getReplayFailures() > 0)
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{
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// The change is leaving this map, so it is not one of the failing ones anymore.
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failingChanges--;
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}
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it.remove();
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}
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}
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finally
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{
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pendingChangesWriteLock.unlock();
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}
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}
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/**
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* Gives up the ownership a replay thread had on the change with the provided CSN,
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* whose replay failed.
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* <p>
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* The change stays listed here and stays uncommitted: it is the barrier which keeps
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* the ServerState - and every change which follows it - from moving past a change
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* which is not in the data (issue #889), and it is what has the replication server
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* send it again over the restarted session. Only the mark which says a replay thread
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* owns it is dropped, so that {@link #putRemoteUpdate(LDAPUpdateMsg)} takes the next
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* delivery instead of discarding it as a duplicate.
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* <p>
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* It also stays listed among the changes the newer ones are checked against: a change
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* which is not in the data yet is exactly what the changes which follow it must depend
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* on, whether or not a replay thread owns it right now.
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* <p>
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* The changes another replay thread is applying right now are left alone: they are
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* about to commit, and forgetting them would have their {@code commit()} fail, the
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* ServerState stay behind them and the replication server replay them a second time.
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*
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* @param csn the CSN of the change whose replay failed
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*/
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public void replayFailed(CSN csn)
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{
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pendingChangesWriteLock.lock();
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try
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{
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final PendingChange change = pendingChanges.get(csn);
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if (change != null && !change.isCommitted())
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{
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change.setOwned(false);
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}
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}
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finally
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{
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pendingChangesWriteLock.unlock();
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}
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}
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/** How long, and how many times, the replay of one change has been failing. */
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static final class ReplayFailure
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{
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private final int attempts;
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private final long failingForMs;
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private ReplayFailure(int attempts, long failingForMs)
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{
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this.attempts = attempts;
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this.failingForMs = failingForMs;
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}
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/**
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* Returns how many deliveries of the change failed to replay it in a row. A delivery
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* is attempted several times in place before it is counted here, so this is a count
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* of deliveries rather than of attempts made on the backend.
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*
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* @return the number of failed deliveries, at least 1
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*/
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int getAttempts()
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{
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return attempts;
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}
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/**
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* Returns how long the replay of the change has been failing, that is the time
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* between its first failure and the one which was just recorded.
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*
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* @return the duration in milliseconds, 0 for a first failure
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*/
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long getFailingForMs()
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{
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return failingForMs;
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}
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}
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/**
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* Records that the replay of the change with the provided CSN failed once more.
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* <p>
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* The failures are kept on the change itself, which stays listed for as long as it has
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* not been applied, so a change which keeps failing keeps its give-up budget across the
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* deliveries which take over from one another, and a change which is replayed or given
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* up on takes its failures away with it (issue #889).
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*
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* @param csn
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* the CSN of the change whose replay failed
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* @param nowMs
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* when it failed, on a clock which only moves forward
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* @return the failures of the change, or {@code null} when it is not listed as an
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* uncommitted change anymore, which happens when the domain was disabled while
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* it was being replayed: there is no change left here to give up on
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*/
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public ReplayFailure recordReplayFailure(CSN csn, long nowMs)
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{
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pendingChangesWriteLock.lock();
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try
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{
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final PendingChange change = pendingChanges.get(csn);
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if (change == null || change.isCommitted())
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{
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return null;
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}
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if (change.getReplayFailures() == 0)
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{
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// Its first failure: this change joins the ones which are failing right now.
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failingChanges++;
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}
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change.recordReplayFailure(nowMs);
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return new ReplayFailure(change.getReplayFailures(), change.getReplayFailingForMs(nowMs));
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}
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finally
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{
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pendingChangesWriteLock.unlock();
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}
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}
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/**
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* Returns whether the replay of any change listed here is failing right now.
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* <p>
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* A change is failing from its first failed replay until it leaves this map, whether
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* it leaves it applied or given up on. The session restart backoff reads this: a
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* change which was replayed only says that this backend is serving again when it is
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* the last one which was failing, and the successful replays which surround a change
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* this replica can not apply must not keep resetting the wait it has reached on it.
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*
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* @return {@code true} while at least one listed change has a failed replay recorded
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* against it
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*/
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boolean hasFailingChanges()
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{
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pendingChangesReadLock.lock();
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try
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{
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return failingChanges > 0;
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}
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finally
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{
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pendingChangesReadLock.unlock();
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}
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}
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/**
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* Forgets every change listed here, without updating the ServerState.
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* <p>
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* Called when the domain is disabled: its ServerState is saved and cleared from
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* memory, and it is loaded again from the backend when the domain is enabled back, so
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* the bookkeeping which goes with it must not outlive it. A change which stayed here
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* would be discarded as a duplicate when the replication server sends it again, and
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* nothing would ever replay it or record it in the ServerState.
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*/
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public void clear()
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{
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pendingChangesWriteLock.lock();
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dependentChangesLock.lock();
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try
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{
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pendingChanges.clear();
|
dependentChanges.clear();
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activeAndDependentChanges.clear();
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failingChanges = 0;
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}
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finally
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{
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dependentChangesLock.unlock();
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pendingChangesWriteLock.unlock();
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}
|
}
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/**
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* Marks the change of the provided message as being replayed.
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*
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* @param msg
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* the message whose change is being replayed
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* @return {@code false} if this message is not the delivery which is listed as
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* pending, which happens when the session was restarted after a failed replay
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* while this message was still waiting in the replay queue: the replication
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* server delivered the change again and that delivery took over from this one,
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* or the domain was disabled and forgot the change, so this copy must not be
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* replayed.
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*/
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public boolean markInProgress(LDAPUpdateMsg msg)
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{
|
pendingChangesWriteLock.lock();
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try
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{
|
final PendingChange change = pendingChanges.get(msg.getCSN());
|
if (change == null || change.isCommitted() || change.getLDAPUpdateMsg() != msg)
|
{
|
return false;
|
}
|
change.setOwned(true);
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activeAndDependentChanges.add(change);
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return true;
|
}
|
finally
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{
|
pendingChangesWriteLock.unlock();
|
}
|
}
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/**
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* Get the first update in the list that have some dependencies cleared.
|
*
|
* @return The LDAPUpdateMsg to be handled.
|
*/
|
public LDAPUpdateMsg getNextUpdate()
|
{
|
pendingChangesReadLock.lock();
|
dependentChangesLock.lock();
|
try
|
{
|
if (!dependentChanges.isEmpty() && !pendingChanges.isEmpty())
|
{
|
PendingChange firstDependentChange = dependentChanges.first();
|
if (pendingChanges.firstKey().isNewerThanOrEqualTo(firstDependentChange.getCSN()))
|
{
|
dependentChanges.remove(firstDependentChange);
|
return firstDependentChange.getLDAPUpdateMsg();
|
}
|
}
|
return null;
|
}
|
finally
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{
|
dependentChangesLock.unlock();
|
pendingChangesReadLock.unlock();
|
}
|
}
|
|
/**
|
* Mark the first pendingChange as dependent on the second PendingChange.
|
* @param dependentChange The PendingChange that depend on the second
|
* PendingChange.
|
*/
|
private void addDependency(PendingChange dependentChange)
|
{
|
pendingChangesReadLock.lock();
|
dependentChangesLock.lock();
|
try
|
{
|
/*
|
* A change which is not listed as pending anymore - the domain was disabled while
|
* its dependencies were computed - must not be listed as dependent either:
|
* getNextUpdate() reads both and would hand out a change nothing owns. The
|
* replication server sends it again when the domain is enabled back.
|
*/
|
if (pendingChanges.containsKey(dependentChange.getCSN()))
|
{
|
dependentChanges.add(dependentChange);
|
}
|
}
|
finally
|
{
|
dependentChangesLock.unlock();
|
pendingChangesReadLock.unlock();
|
}
|
}
|
|
private PendingChange getPendingChange(CSN csn)
|
{
|
pendingChangesReadLock.lock();
|
try
|
{
|
return pendingChanges.get(csn);
|
}
|
finally
|
{
|
pendingChangesReadLock.unlock();
|
}
|
}
|
|
/**
|
* Check if the given AddOperation has some dependencies on any
|
* currently running previous operation.
|
* Update the dependency list in the associated PendingChange if
|
* there are some dependencies.
|
* AddOperation depends on
|
*
|
* - DeleteOperation done on the same DN
|
* - ModifyDnOperation with the same target DN as the ADD DN
|
* - ModifyDnOperation with new DN equals to the ADD DN parent
|
* - AddOperation done on the parent DN of the ADD DN
|
*
|
* @param op The AddOperation to be checked.
|
*
|
* @return A boolean indicating if this operation has some dependencies.
|
*/
|
public boolean checkDependencies(AddOperation op)
|
{
|
final CSN csn = OperationContext.getCSN(op);
|
final PendingChange change = getPendingChange(csn);
|
if (change == null)
|
{
|
return false;
|
}
|
|
boolean hasDependencies = false;
|
final DN targetDN = op.getEntryDN();
|
for (PendingChange pendingChange : activeAndDependentChanges)
|
{
|
if (pendingChange.getCSN().isNewerThanOrEqualTo(csn))
|
{
|
// From now on, the dependency should be for newer changes to be dependent on this one, so we can stop for now.
|
break;
|
}
|
final LDAPUpdateMsg pendingMsg = pendingChange.getLDAPUpdateMsg();
|
if (pendingMsg instanceof DeleteMsg)
|
{
|
if (pendingMsg.getDN().equals(targetDN))
|
{
|
// it is a deleteOperation on the same DN
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
else if (pendingMsg instanceof AddMsg)
|
{
|
if (pendingMsg.getDN().isSuperiorOrEqualTo(targetDN))
|
{
|
// it is an addOperation on a parent of the current AddOperation
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
else if (pendingMsg instanceof ModifyDNMsg)
|
{
|
// it is a ModifyDnOperation with the same target DN as the ADD DN
|
// or a ModifyDnOperation with new DN equals to the ADD DN parent?
|
if (pendingMsg.getDN().equals(targetDN))
|
{
|
hasDependencies = true;
|
addDependency(change);
|
}
|
else
|
{
|
final ModifyDNMsg pendingModDn = (ModifyDNMsg) pendingMsg;
|
if (pendingModDn.newDNIsParent(targetDN))
|
{
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
}
|
}
|
return hasDependencies;
|
}
|
|
/**
|
* Check if the given ModifyOperation has some dependencies on any
|
* currently running previous operation.
|
* Update the dependency list in the associated PendingChange if
|
* there are some dependencies.
|
*
|
* ModifyOperation depends on
|
* - AddOperation done on the same DN
|
* - ModifyDNOperation having newDN the same as targetDN
|
*
|
* @param op The ModifyOperation to be checked.
|
*
|
* @return A boolean indicating if this operation has some dependencies.
|
*/
|
public boolean checkDependencies(ModifyOperation op)
|
{
|
final CSN csn = OperationContext.getCSN(op);
|
final PendingChange change = getPendingChange(csn);
|
if (change == null)
|
{
|
return false;
|
}
|
|
boolean hasDependencies = false;
|
final DN targetDN = change.getLDAPUpdateMsg().getDN();
|
for (PendingChange pendingChange : activeAndDependentChanges)
|
{
|
if (pendingChange.getCSN().isNewerThanOrEqualTo(csn))
|
{
|
// From now on, the dependency should be for newer changes to be dependent on this one, so we can stop for now.
|
break;
|
}
|
final LDAPUpdateMsg pendingMsg = pendingChange.getLDAPUpdateMsg();
|
if (pendingMsg instanceof AddMsg)
|
{
|
if (pendingMsg.getDN().equals(targetDN))
|
{
|
// it is an addOperation on a same DN
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
else if (pendingMsg instanceof ModifyDNMsg)
|
{
|
if (((ModifyDNMsg) pendingMsg).newDNIsEqual(targetDN))
|
{
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
else if (pendingMsg instanceof ModifyMsg)
|
{
|
if (pendingMsg.getDN().equals(targetDN))
|
{
|
// it is another modify on the same DN, they depend
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
}
|
return hasDependencies;
|
}
|
|
/**
|
* Check if the given ModifyDNMsg has some dependencies on any
|
* currently running previous operation.
|
* Update the dependency list in the associated PendingChange if
|
* there are some dependencies.
|
*
|
* Modify DN Operation depends on
|
* - AddOperation done on the same DN as the target DN of the MODDN operation
|
* - AddOperation done on the new parent of the MODDN operation
|
* - DeleteOperation done on the new DN of the MODDN operation
|
* - ModifyDNOperation done from the new DN of the MODDN operation
|
*
|
* TODO: Consider cases where there is a rename A -> B then rename B -> C. Second change depends on first
|
*
|
* @param msg The ModifyDNMsg to be checked.
|
*
|
* @return A boolean indicating if this operation has some dependencies.
|
*/
|
public boolean checkDependencies(ModifyDNMsg msg)
|
{
|
final CSN csn = msg.getCSN();
|
final PendingChange change = getPendingChange(csn);
|
if (change == null)
|
{
|
return false;
|
}
|
|
boolean hasDependencies = false;
|
final DN targetDN = change.getLDAPUpdateMsg().getDN();
|
for (PendingChange pendingChange : activeAndDependentChanges)
|
{
|
if (pendingChange.getCSN().isNewerThanOrEqualTo(csn))
|
{
|
// From now on, the dependency should be for newer changes to be dependent on this one, so we can stop for now.
|
break;
|
}
|
final LDAPUpdateMsg pendingMsg = pendingChange.getLDAPUpdateMsg();
|
if (pendingMsg instanceof DeleteMsg)
|
{
|
// Check if the target of the Delete is the same
|
// as the new DN of this ModifyDN
|
if (msg.newDNIsEqual(pendingMsg.getDN()))
|
{
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
else if (pendingMsg instanceof AddMsg)
|
{
|
// Check if the Add Operation was done on the new parent of
|
// the MODDN operation
|
if (msg.newParentIsEqual(pendingMsg.getDN()))
|
{
|
hasDependencies = true;
|
addDependency(change);
|
}
|
// Check if the AddOperation was done on the same DN as the
|
// target DN of the MODDN operation
|
if (pendingMsg.getDN().equals(targetDN))
|
{
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
else if (pendingMsg instanceof ModifyDNMsg)
|
{
|
if (msg.newDNIsEqual(pendingMsg.getDN()))
|
{
|
// the ModifyDNOperation was done from the new DN of the MODDN operation
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
}
|
return hasDependencies;
|
}
|
|
/**
|
* Check if the given DeleteOperation has some dependencies on any
|
* currently running previous operation.
|
* Update the dependency list in the associated PendingChange if
|
* there are some dependencies.
|
*
|
* DeleteOperation depends on
|
* - DeleteOperation done on children DN
|
* - ModifyDnOperation with target DN that are children of the DEL DN
|
* - AddOperation done on the same DN
|
*
|
*
|
* @param op The DeleteOperation to be checked.
|
*
|
* @return A boolean indicating if this operation has some dependencies.
|
*/
|
public boolean checkDependencies(DeleteOperation op)
|
{
|
final CSN csn = OperationContext.getCSN(op);
|
final PendingChange change = getPendingChange(csn);
|
if (change == null)
|
{
|
return false;
|
}
|
|
boolean hasDependencies = false;
|
final DN targetDN = op.getEntryDN();
|
for (PendingChange pendingChange : activeAndDependentChanges)
|
{
|
if (pendingChange.getCSN().isNewerThanOrEqualTo(csn))
|
{
|
// From now on, the dependency should be for newer changes to be dependent on this one, so we can stop for now.
|
break;
|
}
|
final LDAPUpdateMsg pendingMsg = pendingChange.getLDAPUpdateMsg();
|
if (pendingMsg instanceof DeleteMsg)
|
{
|
/*
|
* Check if the operation to be run is a deleteOperation on a
|
* children of the current DeleteOperation.
|
*/
|
if (pendingMsg.getDN().isSubordinateOrEqualTo(targetDN))
|
{
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
else if (pendingMsg instanceof AddMsg)
|
{
|
/*
|
* Check if the operation to be run is an addOperation on a
|
* parent of the current DeleteOperation.
|
*/
|
if (pendingMsg.getDN().equals(targetDN))
|
{
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
else if (pendingMsg instanceof ModifyDNMsg)
|
{
|
final ModifyDNMsg pendingModDn = (ModifyDNMsg) pendingMsg;
|
/*
|
* Check if the operation to be run is an ModifyDNOperation
|
* on a children of the current DeleteOperation
|
*/
|
if (pendingMsg.getDN().isSubordinateOrEqualTo(targetDN) || pendingModDn.newDNIsParent(targetDN))
|
{
|
hasDependencies = true;
|
addDependency(change);
|
}
|
}
|
}
|
return hasDependencies;
|
}
|
|
/**
|
* Check the dependencies of a given Operation/UpdateMsg.
|
*
|
* @param op The Operation for which dependencies must be checked.
|
* @param msg The LocalizableMessage for which dependencies must be checked.
|
* @return A boolean indicating if an operation cannot be replayed
|
* because of dependencies.
|
*/
|
public boolean checkDependencies(Operation op, LDAPUpdateMsg msg)
|
{
|
if (op instanceof ModifyOperation)
|
{
|
return checkDependencies((ModifyOperation) op);
|
}
|
else if (op instanceof DeleteOperation)
|
{
|
return checkDependencies((DeleteOperation) op);
|
}
|
else if (op instanceof AddOperation)
|
{
|
return checkDependencies((AddOperation) op);
|
}
|
else if (op instanceof ModifyDNOperationBasis)
|
{
|
return checkDependencies((ModifyDNMsg) msg);
|
}
|
else
|
{
|
return true; // unknown type of operation ?!
|
}
|
}
|
}
|
