Example usage for org.apache.commons.dbcp2.managed ManagedDataSource getConnection

Introduction

In this page you can find the example usage for org.apache.commons.dbcp2.managed ManagedDataSource getConnection.

Prototype

@Override
    public Connection getConnection() throws SQLException 

Source Link

Usage

From source file:org.noerp.entity.connection.DBCPConnectionFactory.java

public Connection getConnection(GenericHelperInfo helperInfo, JdbcElement abstractJdbc)
        throws SQLException, GenericEntityException {
    String cacheKey = helperInfo.getHelperFullName();
    ManagedDataSource mds = dsCache.get(cacheKey);
    if (mds != null) {
        return TransactionUtil.getCursorConnection(helperInfo, mds.getConnection());
    }/* w w  w. j a  v a  2s.c om*/
    if (!(abstractJdbc instanceof InlineJdbc)) {
        throw new GenericEntityConfException(
                "DBCP requires an <inline-jdbc> child element in the <datasource> element");
    }
    InlineJdbc jdbcElement = (InlineJdbc) abstractJdbc;
    // connection properties
    TransactionManager txMgr = TransactionFactoryLoader.getInstance().getTransactionManager();
    String driverName = jdbcElement.getJdbcDriver();

    String jdbcUri = helperInfo.getOverrideJdbcUri(jdbcElement.getJdbcUri());
    String jdbcUsername = helperInfo.getOverrideUsername(jdbcElement.getJdbcUsername());
    String jdbcPassword = helperInfo.getOverridePassword(EntityConfig.getJdbcPassword(jdbcElement));

    // pool settings
    int maxSize = jdbcElement.getPoolMaxsize();
    int minSize = jdbcElement.getPoolMinsize();
    int maxIdle = jdbcElement.getIdleMaxsize();
    // maxIdle must be greater than pool-minsize
    maxIdle = maxIdle > minSize ? maxIdle : minSize;
    // load the driver
    Driver jdbcDriver;
    synchronized (DBCPConnectionFactory.class) {
        // Sync needed for MS SQL JDBC driver. See OFBIZ-5216.
        try {
            jdbcDriver = (Driver) Class
                    .forName(driverName, true, Thread.currentThread().getContextClassLoader()).newInstance();
        } catch (Exception e) {
            Debug.logError(e, module);
            throw new GenericEntityException(e.getMessage(), e);
        }
    }

    // connection factory properties
    Properties cfProps = new Properties();
    cfProps.put("user", jdbcUsername);
    cfProps.put("password", jdbcPassword);

    // create the connection factory
    org.apache.commons.dbcp2.ConnectionFactory cf = new DriverConnectionFactory(jdbcDriver, jdbcUri, cfProps);

    // wrap it with a LocalXAConnectionFactory
    XAConnectionFactory xacf = new LocalXAConnectionFactory(txMgr, cf);

    // create the pool object factory
    PoolableConnectionFactory factory = new PoolableManagedConnectionFactory(xacf, null);
    factory.setValidationQuery(jdbcElement.getPoolJdbcTestStmt());
    factory.setDefaultReadOnly(false);
    String transIso = jdbcElement.getIsolationLevel();
    if (!transIso.isEmpty()) {
        if ("Serializable".equals(transIso)) {
            factory.setDefaultTransactionIsolation(Connection.TRANSACTION_SERIALIZABLE);
        } else if ("RepeatableRead".equals(transIso)) {
            factory.setDefaultTransactionIsolation(Connection.TRANSACTION_REPEATABLE_READ);
        } else if ("ReadUncommitted".equals(transIso)) {
            factory.setDefaultTransactionIsolation(Connection.TRANSACTION_READ_UNCOMMITTED);
        } else if ("ReadCommitted".equals(transIso)) {
            factory.setDefaultTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);
        } else if ("None".equals(transIso)) {
            factory.setDefaultTransactionIsolation(Connection.TRANSACTION_NONE);
        }
    }

    // configure the pool settings
    GenericObjectPoolConfig poolConfig = new GenericObjectPoolConfig();
    poolConfig.setMaxTotal(maxSize);
    // settings for idle connections
    poolConfig.setMaxIdle(maxIdle);
    poolConfig.setMinIdle(minSize);
    poolConfig.setTimeBetweenEvictionRunsMillis(jdbcElement.getTimeBetweenEvictionRunsMillis());
    poolConfig.setMinEvictableIdleTimeMillis(-1); // disabled in favour of setSoftMinEvictableIdleTimeMillis(...)
    poolConfig.setSoftMinEvictableIdleTimeMillis(jdbcElement.getSoftMinEvictableIdleTimeMillis());
    poolConfig.setNumTestsPerEvictionRun(maxSize); // test all the idle connections
    // settings for when the pool is exhausted
    poolConfig.setBlockWhenExhausted(true); // the thread requesting the connection waits if no connection is available
    poolConfig.setMaxWaitMillis(jdbcElement.getPoolSleeptime()); // throw an exception if, after getPoolSleeptime() ms, no connection is available for the requesting thread
    // settings for the execution of the validation query
    poolConfig.setTestOnCreate(jdbcElement.getTestOnCreate());
    poolConfig.setTestOnBorrow(jdbcElement.getTestOnBorrow());
    poolConfig.setTestOnReturn(jdbcElement.getTestOnReturn());
    poolConfig.setTestWhileIdle(jdbcElement.getTestWhileIdle());

    GenericObjectPool pool = new GenericObjectPool(factory, poolConfig);
    factory.setPool(pool);

    mds = new ManagedDataSource(pool, xacf.getTransactionRegistry());
    //mds = new DebugManagedDataSource(pool, xacf.getTransactionRegistry()); // Useful to debug the usage of connections in the pool
    mds.setAccessToUnderlyingConnectionAllowed(true);

    // cache the pool
    dsCache.putIfAbsent(cacheKey, mds);
    mds = dsCache.get(cacheKey);

    return TransactionUtil.getCursorConnection(helperInfo, mds.getConnection());
}

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