001/*
002 * (C) Copyright 2006-2011 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Florent Guillaume
018 */
019package org.nuxeo.ecm.core.storage.sql;
020
021import java.util.ArrayList;
022import java.util.Collection;
023
024/**
025 * Propagator of invalidations to a set of {@link InvalidationsQueue}s.
026 */
027public class InvalidationsPropagator {
028
029    public final ArrayList<InvalidationsQueue> queues; // used synchronized
030
031    public InvalidationsPropagator() {
032        queues = new ArrayList<InvalidationsQueue>();
033    }
034
035    public synchronized void addQueue(InvalidationsQueue queue) {
036        if (!queues.contains(queue)) {
037            queues.add(queue);
038        }
039    }
040
041    public synchronized void removeQueue(InvalidationsQueue queue) {
042        queues.remove(queue);
043    }
044
045    @SuppressWarnings("unchecked")
046    public void propagateInvalidations(Invalidations invalidations, InvalidationsQueue skipQueue) {
047        Collection<InvalidationsQueue> qq;
048        synchronized (this) {
049            qq = (Collection<InvalidationsQueue>) queues.clone();
050        }
051        for (InvalidationsQueue q : qq) {
052            if (q != skipQueue) {
053                q.addInvalidations(invalidations);
054            }
055        }
056    }
057
058}