dynamic datasource for jdbctemplate with no transaction manager
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08-10-2022 - |
Domanda
I have a scenario, wherein I need to dynamically switch the data source during application run time.
For this I have JDBCManager class which maintains a map of pooled datasources (C3P0), on request of a particular spring jdbctemplate, I looked at key and return appropriate jdbctemplate with data source. as below
public JdbcTemplate getJdbcTemplate(long targetId) throws DataAccessDeniedException {
return new JdbcTemplate(this.map.get(targetId));
}
I have not configured any transaction manager in my config, nor I have attached any transaction manager while I pragmatically creating a Datasourec as below
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;
}
Currently I am facing issue wherein After few minutes of processing my c3p0 connection pool runs out of connections and everything starts failing with following error
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
I suspect something is wrong with transactions or there is connection leak.
My doubt is will jdbctemplate release / manage connections appropriately when there is no transaction manager configured?
Nessuna soluzione corretta