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 $

    /**
     * Verifies that validation exceptions always propagate
     */
    public void testExceptionOnValidate() throws Exception {
        SelectiveFactory factory = new SelectiveFactory();
        ObjectPool pool = new StackObjectPool(factory, 2);
        factory.setThrowOnValidate(true);
        
        // addObject
        try {
            pool.addObject();
            fail("Expecting IntegerFactoryException");
        } catch (IntegerFactoryException ex) {
            assertEquals("validateObject", ex.getType());
        }
        assertEquals(0, pool.getNumIdle());
        
        // returnObject 
        factory.setThrowOnValidate(false);
        Object obj = pool.borrowObject();
        factory.setThrowOnValidate(true);
        try {
            pool.returnObject(obj);
            fail("Expecting IntegerFactoryException");
        } catch (IntegerFactoryException ex) {
            assertEquals("validateObject", ex.getType());
        }
        assertEquals(0, pool.getNumIdle());
        
        // borrowObject - throws NoSuchElementException
        try {
            pool.borrowObject();
            fail("Expecting NoSuchElementException");
        } catch (NoSuchElementException ex) {
            // Expected
        }
    }

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     * Verifies that exceptions thrown by makeObject are propagated.
     */
    public void testExceptionOnMake() throws Exception {
        SelectiveFactory factory = new SelectiveFactory();
        factory.setThrowOnMake(true);
        ObjectPool pool = new StackObjectPool(factory);
        try {
            pool.borrowObject();
            fail("Expecting IntegerFactoryException");
        } catch (IntegerFactoryException ex) {
            assertEquals("makeObject", ex.getType());
        }
        try {
            pool.addObject();
            fail("Expecting IntegerFactoryException");
        } catch (IntegerFactoryException ex) {
            assertEquals("makeObject", ex.getType());
        }
    }

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    /**
     * Verifies NoSuchElementException when the factory returns a null object in borrowObject
     */
    public void testMakeNull() throws Exception {
        SelectiveFactory factory = new SelectiveFactory();
        ObjectPool pool = new StackObjectPool(factory);
        factory.setMakeNull(true);
        try {
            pool.borrowObject();
            fail("Expecting NoSuchElementException");
        } catch (NoSuchElementException ex) {
            // Expected
        }
    }

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    /**
     * Verifies that initIdleCapacity is not a hard limit, but maxIdle is.
     */
    public void testInitIdleCapacityExceeded() throws Exception {
        PoolableObjectFactory factory = new SimpleFactory();
        ObjectPool pool = new StackObjectPool(factory, 2, 1);
        pool.addObject();
        pool.addObject();
        assertEquals(2, pool.getNumIdle());
        pool.close();
        pool = new StackObjectPool(factory, 1, 2);
        pool.addObject();
        pool.addObject();
        assertEquals(1, pool.getNumIdle());
    }

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     * Verifies close contract - idle instances are destroyed, returning instances
     * are destroyed, add/borrowObject throw IllegalStateException.
     */
    public void testClose() throws Exception {
        SelectiveFactory factory = new SelectiveFactory();
        ObjectPool pool = new StackObjectPool(factory);
        pool.addObject(); // 0
        pool.addObject(); // 1
        pool.addObject(); // 2
        Integer two = (Integer) pool.borrowObject();
        assertEquals(2, two.intValue());
        pool.close();
        assertEquals(0, pool.getNumIdle());
        assertEquals(1, pool.getNumActive());
        List destroyed = factory.getDestroyed();
        assertEquals(2, destroyed.size());
        assertTrue(destroyed.contains(new Integer(0)));
        assertTrue(destroyed.contains(new Integer(0)));
        pool.returnObject(two);
        assertTrue(destroyed.contains(two));
        try {
            pool.addObject();
            fail("Expecting IllegalStateException");
        } catch (IllegalStateException ex) {
            // Expected
        }
        try {
            pool.borrowObject();
            fail("Expecting IllegalStateException");
        } catch (IllegalStateException ex) {
            // Expected
        }
    }

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    protected Object getNthObject(int n) {
        return String.valueOf(n);
    }


    public void testIdleCap() throws Exception {
        ObjectPool pool = makeEmptyPool(8);
        Object[] active = new Object[100];
        for(int i=0;i<100;i++) {
            active[i] = pool.borrowObject();
        }
        assertEquals(100,pool.getNumActive());
        assertEquals(0,pool.getNumIdle());
        for(int i=0;i<100;i++) {
            pool.returnObject(active[i]);
            assertEquals(99 - i,pool.getNumActive());
            assertEquals((i < 8 ? i+1 : 8),pool.getNumIdle());
        }
    }

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    /**
     * @deprecated - to be removed in pool 2.0
     */
    public void testPoolWithNullFactory() throws Exception {
        ObjectPool pool = new StackObjectPool(10);
        for(int i=0;i<10;i++) {
            pool.returnObject(new Integer(i));
        }
        for(int j=0;j<3;j++) {
            Integer[] borrowed = new Integer[10];
            BitSet found = new BitSet();
            for(int i=0;i<10;i++) {
                borrowed[i] = (Integer)(pool.borrowObject());
                assertNotNull(borrowed);
                assertTrue(!found.get(borrowed[i].intValue()));
                found.set(borrowed[i].intValue());
            }
            for(int i=0;i<10;i++) {
                pool.returnObject(borrowed[i]);
            }
        }
        pool.invalidateObject(pool.borrowObject());
        pool.invalidateObject(pool.borrowObject());
        pool.clear();        
    }

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    /**
     * @deprecated - to be removed in pool 2.0
     */
    public void testBorrowFromEmptyPoolWithNullFactory() throws Exception {
        ObjectPool pool = new StackObjectPool();
        try {
            pool.borrowObject();
            fail("Expected NoSuchElementException");
        } catch(NoSuchElementException e) {
            // expected
        }
    }

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    /**
     * @deprecated - to be removed in pool 2.0
     */
    public void testSetFactory() throws Exception {
        ObjectPool pool = new StackObjectPool();
        try {
            pool.borrowObject();
            fail("Expected NoSuchElementException");
        } catch(NoSuchElementException e) {
            // expected
        }
        pool.setFactory(new SimpleFactory());
        Object obj = pool.borrowObject();
        assertNotNull(obj);
        pool.returnObject(obj);
    }

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    /**
     * @deprecated - to be removed in pool 2.0
     */
    public void testCantResetFactoryWithActiveObjects() throws Exception {
        ObjectPool pool = new StackObjectPool();
        pool.setFactory(new SimpleFactory());
        Object obj = pool.borrowObject();
        assertNotNull(obj);


        try {
            pool.setFactory(new SimpleFactory());
            fail("Expected IllegalStateException");
        } catch(IllegalStateException e) {
            // expected
        }        
    }

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