001    /**
002     * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.poller;
016    
017    import com.liferay.portal.kernel.json.JSONArray;
018    import com.liferay.portal.kernel.json.JSONFactoryUtil;
019    import com.liferay.portal.kernel.json.JSONObject;
020    import com.liferay.portal.kernel.log.Log;
021    import com.liferay.portal.kernel.log.LogFactoryUtil;
022    import com.liferay.portal.kernel.notifications.ChannelException;
023    import com.liferay.portal.kernel.notifications.ChannelHubManagerUtil;
024    import com.liferay.portal.kernel.notifications.ChannelListener;
025    import com.liferay.portal.kernel.notifications.NotificationEvent;
026    import com.liferay.portal.kernel.notifications.UnknownChannelException;
027    import com.liferay.portal.util.PropsValues;
028    
029    import java.util.List;
030    
031    /**
032     * @author Edward Han
033     */
034    public class SynchronousPollerChannelListener implements ChannelListener {
035    
036            public SynchronousPollerChannelListener(
037                    long companyId, long userId,
038                    JSONObject pollerResponseHeaderJSONObject) {
039    
040                    _companyId = companyId;
041                    _userId = userId;
042                    _pollerResponseHeaderJSONObject = pollerResponseHeaderJSONObject;
043            }
044    
045            public synchronized void channelListenerRemoved(long channelId) {
046                    _complete = true;
047    
048                    this.notify();
049            }
050    
051            public synchronized String getNotificationEvents(long timeout)
052                    throws ChannelException {
053    
054                    try {
055                            if (!_complete) {
056                                    this.wait(timeout);
057                            }
058                    }
059                    catch (InterruptedException ie) {
060                    }
061    
062                    try {
063                            Thread.sleep(PropsValues.POLLER_NOTIFICATIONS_TIMEOUT);
064                    }
065                    catch (InterruptedException ie) {
066                    }
067    
068                    List<NotificationEvent> notificationEvents = null;
069    
070                    try {
071                            notificationEvents = ChannelHubManagerUtil.getNotificationEvents(
072                                    _companyId, _userId, true);
073                    }
074                    catch (UnknownChannelException uce) {
075                            if (_log.isDebugEnabled()) {
076                                    _log.debug(
077                                            "Unable to complete processing because user session ended",
078                                            uce);
079                            }
080    
081                            return null;
082                    }
083    
084                    JSONArray jsonArray = JSONFactoryUtil.createJSONArray();
085    
086                    jsonArray.put(_pollerResponseHeaderJSONObject);
087    
088                    for (NotificationEvent notificationEvent : notificationEvents) {
089                            jsonArray.put(notificationEvent.toJSONObject());
090                    }
091    
092                    return jsonArray.toString();
093            }
094    
095            public synchronized void notificationEventsAvailable(long channelId) {
096                    _complete = true;
097    
098                    this.notify();
099            }
100    
101            private static Log _log = LogFactoryUtil.getLog(
102                    SynchronousPollerChannelListener.class);
103    
104            private long _companyId;
105            private boolean _complete;
106            private JSONObject _pollerResponseHeaderJSONObject;
107            private long _userId;
108    
109    }