001    /**
002     * Copyright (c) 2000-2010 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.kernel.cluster;
016    
017    import com.liferay.portal.kernel.exception.SystemException;
018    import com.liferay.portal.kernel.log.Log;
019    import com.liferay.portal.kernel.log.LogFactoryUtil;
020    
021    import java.util.Collections;
022    import java.util.List;
023    
024    /**
025     * @author Tina Tian
026     */
027    public class ClusterExecutorUtil {
028    
029            public static void addClusterEventListener(
030                    ClusterEventListener clusterEventListener) {
031    
032                    if ((_clusterExecutor == null) || !_clusterExecutor.isEnabled()) {
033                            if (_log.isWarnEnabled()) {
034                                    _log.warn("ClusterExecutorUtil has not been initialized");
035                            }
036    
037                            return;
038                    }
039    
040                    _clusterExecutor.addClusterEventListener(clusterEventListener);
041            }
042    
043            public static void destroy() {
044                    if ((_clusterExecutor == null) || !_clusterExecutor.isEnabled()) {
045                            if (_log.isWarnEnabled()) {
046                                    _log.warn("ClusterExecutorUtil has not been initialized");
047                            }
048    
049                            return;
050                    }
051    
052                    _clusterExecutor.destroy();
053            }
054    
055            public static FutureClusterResponses execute(ClusterRequest clusterRequest)
056                    throws SystemException {
057    
058                    if ((_clusterExecutor == null) || !_clusterExecutor.isEnabled()) {
059                            if (_log.isWarnEnabled()) {
060                                    _log.warn("ClusterExecutorUtil has not been initialized");
061                            }
062    
063                            return null;
064                    }
065    
066                    return _clusterExecutor.execute(clusterRequest);
067            }
068    
069            public static List<ClusterNode> getClusterNodes() {
070                    if ((_clusterExecutor == null) || !_clusterExecutor.isEnabled()) {
071                            if (_log.isWarnEnabled()) {
072                                    _log.warn("ClusterExecutorUtil has not been initialized");
073                            }
074    
075                            return Collections.EMPTY_LIST;
076                    }
077    
078                    return _clusterExecutor.getClusterNodes();
079            }
080    
081            public static ClusterNode getLocalClusterNode() throws SystemException {
082                    if ((_clusterExecutor == null) || !_clusterExecutor.isEnabled()) {
083                            if (_log.isWarnEnabled()) {
084                                    _log.warn("ClusterExecutorUtil has not been initialized");
085                            }
086    
087                            return null;
088                    }
089    
090                    return _clusterExecutor.getLocalClusterNode();
091            }
092    
093            public static void initialize() {
094                    if ((_clusterExecutor == null) || !_clusterExecutor.isEnabled()) {
095                            if (_log.isWarnEnabled()) {
096                                    _log.warn("ClusterExecutorUtil has not been initialized");
097                            }
098    
099                            return;
100                    }
101    
102                    _clusterExecutor.initialize();
103            }
104    
105            public static boolean isClusterNodeAlive(String clusterNodeId) {
106                    if ((_clusterExecutor == null) || !_clusterExecutor .isEnabled()) {
107                            if (_log.isWarnEnabled()) {
108                                    _log.warn("ClusterExecutorUtil has not been initialized");
109                            }
110    
111                            return false;
112                    }
113    
114                    return _clusterExecutor.isClusterNodeAlive(clusterNodeId);
115            }
116    
117            public static boolean isEnabled() {
118                    if ((_clusterExecutor == null) || !_clusterExecutor.isEnabled()) {
119                            if (_log.isWarnEnabled()) {
120                                    _log.warn("ClusterExecutorUtil has not been initialized");
121                            }
122    
123                            return false;
124                    }
125    
126                    return true;
127            }
128    
129            public static void removeClusterEventListener(
130                    ClusterEventListener clusterEventListener) {
131    
132                    if ((_clusterExecutor == null) || !_clusterExecutor.isEnabled()) {
133                            if (_log.isWarnEnabled()) {
134                                    _log.warn("ClusterExecutorUtil has not been initialized");
135                            }
136    
137                            return;
138                    }
139    
140                    _clusterExecutor.removeClusterEventListener(clusterEventListener);
141            }
142    
143            public void setClusterExecutor(ClusterExecutor clusterExecutor) {
144                    _clusterExecutor = clusterExecutor;
145            }
146    
147            private static Log _log = LogFactoryUtil.getLog(ClusterExecutorUtil.class);
148    
149            private static ClusterExecutor _clusterExecutor;
150    
151    }