Examples of org.apache.commons.pool.impl.GenericObjectPool.borrowObject()

Class org.apache.commons.pool.impl.GenericObjectPool

Examples of org.apache.commons.pool.impl.GenericObjectPool.borrowObject()

org.apache.commons.pool.impl.GenericObjectPool.borrowObject()

Borrows an object from the pool.

If there is an idle instance available in the pool, then either the most-recently returned (if {@link #getLifo() lifo} == true) or "oldest" (lifo == false) instance sitting idle in the poolwill be activated and returned. If activation fails, or {@link #getTestOnBorrow() testOnBorrow} is setto true and validation fails, the instance is destroyed and the next available instance is examined. This continues until either a valid instance is returned or there are no more idle instances available.

If there are no idle instances available in the pool, behavior depends on the {@link #getMaxActive() maxActive}and (if applicable) {@link #getWhenExhaustedAction() whenExhaustedAction} and {@link #getMaxWait() maxWait}properties. If the number of instances checked out from the pool is less than maxActive, a new instance is created, activated and (if applicable) validated and returned to the caller.

If the pool is exhausted (no available idle instances and no capacity to create new ones), this method will either block ( {@link #WHEN_EXHAUSTED_BLOCK}), throw a NoSuchElementException ( {@link #WHEN_EXHAUSTED_FAIL}), or grow ( {@link #WHEN_EXHAUSTED_GROW} - ignoring maxActive).The length of time that this method will block when whenExhaustedAction == WHEN_EXHAUSTED_BLOCK is determined by the {@link #getMaxWait() maxWait} property.
When the pool is exhausted, multiple calling threads may be simultaneously blocked waiting for instances to become available. As of pool 1.5, a "fairness" algorithm has been implemented to ensure that threads receive available instances in request arrival order.
@return object instance @throws NoSuchElementException if an instance cannot be returned

  {
    ScriptingContainer container = null;
    try 
    {
      GenericObjectPool pool = (GenericObjectPool) message.getSession().getServletContext().getAttribute(Attributes.POOL);
      container = (ScriptingContainer) pool.borrowObject();
            long beginTime = System.currentTimeMillis();
      try 
      {
        Object app = container.runScriptlet("Sipatra::Application::new");

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        CPDSConnectionFactory factory = 
            new CPDSConnectionFactory(cpds, pool, null, "username", "password");
        
        // Checkout a pair of connections
        PooledConnection pcon1 = 
            ((PooledConnectionAndInfo) pool.borrowObject())
                .getPooledConnection();
        Connection con1 = pcon1.getConnection();
        PooledConnection pcon2 = 
            ((PooledConnectionAndInfo) pool.borrowObject())
                .getPooledConnection();

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        PooledConnection pcon1 = 
            ((PooledConnectionAndInfo) pool.borrowObject())
                .getPooledConnection();
        Connection con1 = pcon1.getConnection();
        PooledConnection pcon2 = 
            ((PooledConnectionAndInfo) pool.borrowObject())
                .getPooledConnection();
        assertEquals(2, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());
        
        // Verify listening

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        assertEquals(1, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());
        
        // Ask for another connection 
        PooledConnection pcon3 = 
            ((PooledConnectionAndInfo) pool.borrowObject())
                .getPooledConnection();
        assertTrue(!pcon3.equals(pcon1)); // better not get baddie back
        assertTrue(!pc.getListeners().contains(factory)); // verify cleanup
        assertEquals(2, pool.getNumActive());
        assertEquals(0, pool.getNumIdle());

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      // lazy initialization of pool
      PoolableObjectFactory factory = new SolbaseHTableInterfaceFactory(config, tableName);
      pool = new GenericObjectPool(factory, this.maxActive);
    }
    try {
      HTableInterface table = (HTableInterface) pool.borrowObject();
      return table;
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }

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