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
021/**
022 * Queue of invalidations.
023 * <p>
024 * All invalidations added are accumulated (from multiple threads), then returned when asked for.
025 */
026public class InvalidationsQueue {
027
028    public Invalidations queue; // used under synchronization
029
030    /** used for debugging */
031    public final String name;
032
033    public InvalidationsQueue(String name) {
034        queue = new Invalidations();
035        this.name = name;
036    }
037
038    /**
039     * Adds invalidations.
040     * <p>
041     * May be called asynchronously from multiple threads.
042     */
043    public synchronized void addInvalidations(Invalidations invalidations) {
044        queue.add(invalidations);
045    }
046
047    /**
048     * Gets the queued invalidations and resets the queue.
049     */
050    public synchronized Invalidations getInvalidations() {
051        Invalidations invalidations = queue;
052        queue = new Invalidations();
053        return invalidations;
054    }
055
056    @Override
057    public String toString() {
058        return getClass().getSimpleName() + '(' + name + ')';
059    }
060
061}