Question

我有一个场景，其中我需要在应用程序运行期间动态切换数据源时间。

为此我有一个JDBCManager类，它维护一个池数据源（C3P0）的映射，根据特定的spring jdbctemplate的请求，我查看了key并返回了与数据源相应的jdbctemplate。如下

public JdbcTemplate getJdbcTemplate(long targetId) throws DataAccessDeniedException {
    return new JdbcTemplate(this.map.get(targetId));

}

我没有在配置中配置任何事务管理器，也没有附加任何事务管理器，而我在实际创建Datasourec如下所示

DriverManagerDataSource dataSource = null;
    dataSource = new DriverManagerDataSource();
    // DataSource dataSource = DataSources.unpooledDataSource();
    dataSource.setDriverClassName(driverClassName);
    dataSource.setUrl(url);
    dataSource.setUsername(userId);
    dataSource.setPassword(userPassword);

    DataSource pooledDataSource;
    try {
        Map<String, Object> overrides = new HashMap<String, Object>();

        overrides.put("minPoolSize", minPoolSize);
        overrides.put("maxPoolSize", maxPoolSize);
        overrides.put("acquireIncrement", acquireIncrement);
        overrides.put("maxIdleTime", maxIdleTime);
        overrides.put("idleConnectionTestPeriod", idleConnectionTestPeriod);
        overrides.put("maxIdleTimeExcessConnections", maxIdleTimeExcessConnections);
        overrides.put("numHelperThreads", numHelperThreads);
        overrides.put("unreturnedConnectionTimeout", unreturnedConnectionTimeout);
        overrides.put("checkoutTimeout", checkoutTimeout);

        // create the PooledDataSource with overrides
        pooledDataSource = DataSources.pooledDataSource(dataSource, overrides);
    } catch (SQLException e) {
        logger.error("Could not create pooled datasource for target: " + targetId);
        throw new RuntimeException(e);
    }        
    // cache the pooledDataSource
    this.map.put(targetId, pooledDataSource);

    return pooledDataSource;
}

目前我面临的问题是，经过几分钟的处理，我的c3p0连接池用尽连接，一切都开始失败并出现以下错误

Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@65d43d1e -- timeout at awaitAvailable()
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1416)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:606)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:526)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutAndMarkConnectionInUse(C3P0PooledConnectionPool.java:756)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:683)
... 61 more

我怀疑交易出现问题或连接泄漏。

我怀疑在没有配置事务管理器的情况下，jdbctemplate会正确地释放/管理连接吗？

没有事务管理器的jdbctemplate的动态数据源

0 个答案: