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.dao.shard;
016    
017    import com.liferay.portal.kernel.log.Log;
018    import com.liferay.portal.kernel.log.LogFactoryUtil;
019    import com.liferay.portal.util.PropsValues;
020    
021    import java.util.Map;
022    import java.util.Set;
023    
024    import javax.sql.DataSource;
025    
026    import org.springframework.aop.TargetSource;
027    
028    /**
029     * @author Michael Young
030     */
031    public class ShardDataSourceTargetSource implements TargetSource {
032    
033            public String[] getAvailableShardNames() {
034                    return _availableShardNames;
035            }
036    
037            public DataSource getDataSource() {
038                    return _dataSource.get();
039            }
040    
041            public Map<String, DataSource> getDataSources() {
042                    return _dataSources;
043            }
044    
045            public Object getTarget() throws Exception {
046                    return getDataSource();
047            }
048    
049            public Class<DataSource> getTargetClass() {
050                    return DataSource.class;
051            }
052    
053            public boolean isStatic() {
054                    return false;
055            }
056    
057            public void releaseTarget(Object target) throws Exception {
058            }
059    
060            public void resetDataSource() {
061                    DataSource dataSource = _dataSources.get(
062                            PropsValues.SHARD_DEFAULT_NAME);
063    
064                    _dataSource.set(dataSource);
065            }
066    
067            public void setDataSource(String shardName) {
068                    DataSource dataSource = _dataSources.get(shardName);
069    
070                    _dataSource.set(dataSource);
071            }
072    
073            public void setDataSources(Map<String, DataSource> dataSources) {
074                    _dataSources = dataSources;
075    
076                    Set<String> shardNames = _dataSources.keySet();
077    
078                    _availableShardNames = shardNames.toArray(
079                            new String[shardNames.size()]);
080    
081                    if (_log.isInfoEnabled()) {
082                            _log.info(
083                                    "Sharding configured with " + _availableShardNames.length +
084                                            " data sources");
085                    }
086            }
087    
088            private static Log _log = LogFactoryUtil.getLog(
089                    ShardDataSourceTargetSource.class);
090    
091            private static String[] _availableShardNames;
092    
093            private static ThreadLocal<DataSource> _dataSource =
094                    new ThreadLocal<DataSource>() {
095    
096                    @Override
097                    protected DataSource initialValue() {
098                            return _dataSources.get(PropsValues.SHARD_DEFAULT_NAME);
099                    }
100    
101            };
102    
103            private static Map<String, DataSource> _dataSources;
104    
105    }