Examples of org.apache.commons.pool.ObjectPool

org.apache.commons.pool.ObjectPool
e the object... } catch(Exception e) { //...handle any exceptions... } finally { // make sure the object is returned to the pool if(null != obj) { pool.returnObject(obj); } } See {@link org.apache.commons.pool.BaseObjectPool BaseObjectPool} for a simple base implementation. @author Rodney Waldhoff @version $Revision: 1.10 $ $Date: 2003/10/09 21:45:56 $

     */
    private synchronized ObjectPool getPool(
        Object key,
        ConnectionFactory connectionFactory)
    {
        ObjectPool connectionPool = mapConnectKeyToPool.get(key);
        if (connectionPool == null) {
            // use GenericObjectPool, which provides for resource limits
            connectionPool = new GenericObjectPool(
                null, // PoolableObjectFactory, can be null
                50, // max active

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            throw new DbcpException(e);
        }
    }
    
    synchronized protected ObjectPool getConnectionPool(String name) throws SQLException {
        ObjectPool pool = (ObjectPool)(_pools.get(name));
        if(null == pool) {
            InputStream in = this.getClass().getResourceAsStream(String.valueOf(name) + ".jocl");
            if(null != in) {
                JOCLContentHandler jocl = null;
                try {

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        }
    }


    public Connection connect(String url, Properties info) throws SQLException {
        if(acceptsURL(url)) {
            ObjectPool pool = getConnectionPool(url.substring(URL_PREFIX_LEN));
            if(null == pool) {
                throw new SQLException("No pool found for " + url + ".");
            } else {
                try {
                    return (Connection)(pool.borrowObject());
                } catch(SQLException e) {
                    throw e;
                } catch(Throwable e) {
                    throw new SQLNestedException("Connect failed", e);
                }

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        } catch(IllegalArgumentException e) {
            // expected
        }


        try {
            ObjectPool pool = new GenericObjectPool(
                new SimpleFactory(),
                GenericObjectPool.DEFAULT_MAX_ACTIVE, 
                Byte.MAX_VALUE,
                GenericObjectPool.DEFAULT_MAX_WAIT, 
                GenericObjectPool.DEFAULT_MAX_IDLE,

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        assertEquals("should be one active", 1, pool.getNumActive());
        pool.returnObject(obj);
        assertEquals("should be one idle", 1, pool.getNumIdle());
        assertEquals("should be zero active", 0, pool.getNumActive());


        ObjectPool op = new GenericObjectPool();
        try {
            op.addObject();
            fail("Expected IllegalStateException when there is no factory.");
        } catch (IllegalStateException ise) {
            //expected
        }
        op.close();
    }

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     * Verifies that validation and passivation failures returning objects are handled
     * properly - instances destroyed and not returned to the pool, but no exceptions propagated.
     */
    public void testBorrowReturnWithSometimesInvalidObjects() throws Exception {
        SelectiveFactory factory = new SelectiveFactory();
        ObjectPool pool = new StackObjectPool(factory, 20);


        Object[] obj = new Object[10];
        for(int i=0;i<10;i++) {
            obj[i] = pool.borrowObject();
            assertEquals("Each time we borrow, get one more active.", i+1, pool.getNumActive());
            
        }
        
        factory.setValidateSelectively(true);  // Even numbers fail validation
        factory.setPassivateSelectively(true); // Multiples of 3 fail passivation


        for(int i=0;i<10;i++) {
            pool.returnObject(obj[i]);
            assertEquals("Each time we return, get one less active.", 9-i, pool.getNumActive());
        }
        // 0,2,4,6,8 fail validation, 3, 9 fail passivation - 3 left.
        assertEquals(3,pool.getNumIdle());
    }

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     * Verifies that when returning objects cause maxSleeping exceeded, oldest instances
     * are destroyed to make room for returning objects.
     */
    public void testReturnObjectDiscardOrder() throws Exception {
        SelectiveFactory factory = new SelectiveFactory();
        ObjectPool pool = new StackObjectPool(factory, 3);


        // borrow more objects than the pool can hold
        Integer i0 = (Integer)pool.borrowObject();
        Integer i1 = (Integer)pool.borrowObject();
        Integer i2 = (Integer)pool.borrowObject();
        Integer i3 = (Integer)pool.borrowObject();


        // tests
        // return as many as the pool will hold.
        pool.returnObject(i0);
        pool.returnObject(i1);
        pool.returnObject(i2);


        // the pool should now be full.
        assertEquals("No returned objects should have been destroyed yet.", 0,  factory.getDestroyed().size());


        // cause the pool to discard a stale object.
        pool.returnObject(i3);
        assertEquals("One object should have been destroyed.", 1, factory.getDestroyed().size());


        // check to see what object was destroyed
        Integer d = (Integer)factory.getDestroyed().get(0);
        assertEquals("Destoryed object should be the stalest object.", i0, d);

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     * the caller.  Objects that throw on activate are destroyed and if none succeed,
     * the caller gets NoSuchElementException.
     */
    public void testExceptionOnActivate() throws Exception {
        SelectiveFactory factory = new SelectiveFactory();
        ObjectPool pool = new StackObjectPool(factory);
        pool.addObject();
        pool.addObject();
        factory.setThrowOnActivate(true);
        try {
            pool.borrowObject();
            fail("Expecting NoSuchElementException");
        } catch (NoSuchElementException ex) {
            // expected
        }
        assertEquals(0, pool.getNumIdle());
        assertEquals(0, pool.getNumActive());
    }

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     * Verifies that exceptions thrown by factory destroy are swallowed
     * by both addObject and returnObject.
     */
    public void testExceptionOnDestroy() throws Exception {
        SelectiveFactory factory = new SelectiveFactory();
        ObjectPool pool = new StackObjectPool(factory, 2);
        factory.setThrowOnDestroy(true);
        for (int i = 0; i < 3; i++) {
            pool.addObject(); // Third one will destroy, exception should be swallowed
        }
        assertEquals(2, pool.getNumIdle());
        
        Object[] objects = new Object[3];
        for (int i = 0; i < 3; i++) {
            objects[i] = pool.borrowObject();
        }
        for (int i = 0; i < 3; i++) {
            pool.returnObject(objects[i]); // Third triggers destroy
        } 
        assertEquals(2, pool.getNumIdle());
    }

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     * Verifies that addObject propagates exceptions thrown by
     * factory passivate, but returnObject swallows these.
     */
    public void testExceptionOnPassivate() throws Exception {
        SelectiveFactory factory = new SelectiveFactory();
        ObjectPool pool = new StackObjectPool(factory, 2);
        factory.setThrowOnPassivate(true);
        
        // addObject propagates
        try {
            pool.addObject();
            fail("Expecting IntegerFactoryException");
        } catch (IntegerFactoryException ex) {
            assertEquals("passivateObject", ex.getType());
            assertEquals(0, ex.getValue());
        }
        assertEquals(0, pool.getNumIdle());
        
        // returnObject swallows 
        Object obj = pool.borrowObject();
        pool.returnObject(obj);
        assertEquals(0, pool.getNumIdle());
    }

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