| package com.dy.common.multiDataSource; | 
|   | 
| import org.apache.ibatis.transaction.Transaction; | 
| import org.springframework.jdbc.CannotGetJdbcConnectionException; | 
| import org.springframework.jdbc.datasource.DataSourceUtils; | 
|   | 
| import javax.sql.DataSource; | 
| import java.sql.Connection; | 
| import java.sql.SQLException; | 
| import java.util.concurrent.ConcurrentHashMap; | 
| import java.util.concurrent.ConcurrentMap; | 
|   | 
| /** | 
|  * 多数据源的事务类,事务对象由事务工厂创建,完成数据库事务操作。 | 
|  * 事务对象包裹着: | 
|  *   数据库连接、事务提交、事务回滚等对象及操作 | 
|  * 在事务对象中具体决定采用的具体数据源 | 
|  */ | 
| public class MultiDataSourceTransaction implements Transaction { | 
|   | 
|     private final DataSource multidataSource; | 
|   | 
|     private final ConcurrentMap<String, Connection> curConMap; | 
|   | 
|     private boolean autoCommit; | 
|   | 
|   | 
|     public MultiDataSourceTransaction(DataSource dataSource, boolean autoCommit) { | 
|         //dataSource是DynamicDataSource类的实例 | 
|         this.multidataSource = dataSource; | 
|         this.autoCommit = autoCommit; | 
|         curConMap = new ConcurrentHashMap<>(); | 
|     } | 
|   | 
|   | 
|     @Override | 
|     public Connection getConnection() throws SQLException { | 
|         String nowDsName = DataSourceContext.get(); | 
|         if (nowDsName == null || "".equals(nowDsName)) {//StringUtils.isEmpty(databaseIdentification) | 
|             //databaseIdentification = DataSourceName.USERDATASOURCE.getName(); | 
|             throw new CannotGetJdbcConnectionException("未得到数据源名称"); | 
|             //nowDsName = "ym" ; | 
|         } | 
|         //获取数据源连接 | 
|         if (!this.curConMap.containsKey(nowDsName)) { | 
|             try { | 
|                 Connection conn = this.multidataSource.getConnection(); | 
|                 this.autoCommit = false; | 
|                 conn.setAutoCommit(false); | 
|                 this.curConMap.put(nowDsName, conn); | 
|             } catch (SQLException ex) { | 
|                 throw new CannotGetJdbcConnectionException("未得到数据源JDBC连接", ex); | 
|             } | 
|         } | 
|         return this.curConMap.get(nowDsName); | 
|     } | 
|   | 
|   | 
|     @Override | 
|     public void commit() throws SQLException { | 
|         for (Connection connection : curConMap.values()) { | 
|             if (!autoCommit) { | 
|                 connection.commit(); | 
|             } | 
|         } | 
|     } | 
|   | 
|     @Override | 
|     public void rollback() throws SQLException { | 
|         for (Connection connection : curConMap.values()) { | 
|             connection.rollback(); | 
|         } | 
|     } | 
|   | 
|     @Override | 
|     public void close() throws SQLException { | 
|         for (Connection connection : curConMap.values()) { | 
|             DataSourceUtils.releaseConnection(connection, this.multidataSource); | 
|         } | 
|     } | 
|   | 
|     @Override | 
|     public Integer getTimeout() throws SQLException { | 
|         return null; | 
|     } | 
| } |