Examples of org.apache.commons.pool.KeyedObjectPool

org.apache.commons.pool.KeyedObjectPool
e the object... } catch(Exception e) { //...handle any exceptions... } finally { // make sure the object is returned to the pool if(null != obj) { pool.returnObject(key,obj); } }
{@link KeyedObjectPool} implementations may choose to store at mostone instance per key value, or may choose to maintain a pool of instances for each key (essentially creating a {@link java.util.Map Map} of{@link ObjectPool pools}).
@author Rodney Waldhoff @version $Revision: 1.12 $ $Date: 2003/10/09 21:45:56 $ @see KeyedPoolableObjectFactory @see KeyedObjectPoolFactory @see ObjectPool

        assertNotNull(obj);
        pool.returnObject("x",obj);
    }


    public void testCantResetFactoryWithActiveObjects() throws Exception {
        KeyedObjectPool pool = new StackKeyedObjectPool();
        pool.setFactory(new SimpleFactory());
        Object obj = pool.borrowObject("x");
        assertNotNull(obj);


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

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            // expected
        }        
    }
    
    public void testCanResetFactoryWithoutActiveObjects() throws Exception {
        KeyedObjectPool pool = new StackKeyedObjectPool();
        {
            pool.setFactory(new SimpleFactory());
            Object obj = pool.borrowObject("x");        
            assertNotNull(obj);
            pool.returnObject("x",obj);
        }
        {
            pool.setFactory(new SimpleFactory());
            Object obj = pool.borrowObject("x");        
            assertNotNull(obj);
            pool.returnObject("x",obj);
        }
    }

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            pool.returnObject("x",obj);
        }
    }


    public void testBorrowReturnWithSometimesInvalidObjects() throws Exception {
        KeyedObjectPool pool = new StackKeyedObjectPool();
        pool.setFactory(
            new KeyedPoolableObjectFactory() {
                int counter = 0;
                public Object makeObject(Object key) { return new Integer(counter++); }
                public void destroyObject(Object key, Object obj) { }
                public boolean validateObject(Object key, Object obj) {
                    if(obj instanceof Integer) {
                        return ((((Integer)obj).intValue() % 2) == 1);
                    } else {
                        return false;
                    }
                }
                public void activateObject(Object key, Object obj) { }
                public void passivateObject(Object key, Object obj) { 
                    if(obj instanceof Integer) {
                        if((((Integer)obj).intValue() % 3) == 0) {
                            throw new RuntimeException("Couldn't passivate");
                        }
                    } else {
                        throw new RuntimeException("Couldn't passivate");
                    }
                }
            }
        );


        Object[] obj = new Object[10];
        for(int i=0;i<10;i++) {
            obj[i] = pool.borrowObject("key");
        }
        for(int i=0;i<10;i++) {
            pool.returnObject("key",obj[i]);
        }
        assertEquals(3,pool.getNumIdle("key"));
    }

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   }


   @Override
   public void releaseTransport(Transport transport) {
      // The invalidateObject()/returnObject() calls could take a long time, so we hold the lock only until we get the connection pool reference
      KeyedObjectPool pool = getConnectionPool();
      TcpTransport tcpTransport = (TcpTransport) transport;
      if (!tcpTransport.isValid()) {
         try {
            if (log.isTraceEnabled()) {
               log.tracef("Dropping connection as it is no longer valid: %s", tcpTransport);
            }
            pool.invalidateObject(tcpTransport.getServerAddress(), tcpTransport);
         } catch (Exception e) {
            log.couldNoInvalidateConnection(tcpTransport, e);
         }
      } else {
         try {
            pool.returnObject(tcpTransport.getServerAddress(), tcpTransport);
         } catch (Exception e) {
            log.couldNotReleaseConnection(tcpTransport, e);
         } finally {
            logConnectionInfo(tcpTransport.getServerAddress());
         }

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         return servers;
      }
   }


   private void logConnectionInfo(InetSocketAddress server) {
      KeyedObjectPool pool = getConnectionPool();
      if (log.isTraceEnabled()) {
         log.tracef("For server %s: active = %d; idle = %d", server, pool.getNumActive(server), pool.getNumIdle(server));
      }
   }

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      }
   }


   private Transport borrowTransportFromPool(InetSocketAddress server) {
      // The borrowObject() call could take a long time, so we hold the lock only until we get the connection pool reference
      KeyedObjectPool pool = getConnectionPool();
      try {
         return (Transport) pool.borrowObject(server);
      } catch (Exception e) {
         String message = "Could not fetch transport";
         log.couldNotFetchTransport(e);
         throw new TransportException(message, e);
      } finally {

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            pool.returnObject("x",obj);
        }
    }


    public void testBorrowReturnWithSometimesInvalidObjects() throws Exception {
        KeyedObjectPool pool = new StackKeyedObjectPool();
        pool.setFactory(
            new KeyedPoolableObjectFactory() {
                int counter = 0;
                public Object makeObject(Object key) { return new Integer(counter++); }
                public void destroyObject(Object key, Object obj) { }
                public boolean validateObject(Object key, Object obj) {
                    if(obj instanceof Integer) {
                        return ((((Integer)obj).intValue() % 2) == 1);
                    } else {
                        return false;
                    }
                }
                public void activateObject(Object key, Object obj) { }
                public void passivateObject(Object key, Object obj) { 
                    if(obj instanceof Integer) {
                        if((((Integer)obj).intValue() % 3) == 0) {
                            throw new RuntimeException("Couldn't passivate");
                        }
                    } else {
                        throw new RuntimeException("Couldn't passivate");
                    }
                }
            }
        );


        Object[] obj = new Object[10];
        for(int i=0;i<10;i++) {
            obj[i] = pool.borrowObject("key");
        }
        for(int i=0;i<10;i++) {
            pool.returnObject("key",obj[i]);
        }
        assertEquals(3,pool.getNumIdle("key"));
    }

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            assertEquals((i < 8 ? i+1 : 8),pool.getNumIdle(""));
        }
    }
    
    public void testPoolWithNullFactory() throws Exception {
        KeyedObjectPool pool = new StackKeyedObjectPool(10);
        for(int i=0;i<10;i++) {
            pool.returnObject("X",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("X"));
                assertNotNull(borrowed);
                assertTrue(!found.get(borrowed[i].intValue()));
                found.set(borrowed[i].intValue());
            }
            for(int i=0;i<10;i++) {
                pool.returnObject("X",borrowed[i]);
            }
        }
        pool.invalidateObject("X",pool.borrowObject("X"));
        pool.invalidateObject("X",pool.borrowObject("X"));
        pool.clear("X");        
        pool.clear();        
    }

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        pool.returnObject("key",obj);
        assertNotNull(pool.toString());
    }
        
    public void testBorrowFromEmptyPoolWithNullFactory() throws Exception {
        KeyedObjectPool pool = new StackKeyedObjectPool();
        try {
            pool.borrowObject("x");
            fail("Expected NoSuchElementException");
        } catch(NoSuchElementException e) {
            // expected
        }
    }

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            // expected
        }
    }
    
    public void testSetFactory() throws Exception {
        KeyedObjectPool pool = new StackKeyedObjectPool();
        try {
            pool.borrowObject("x");
            fail("Expected NoSuchElementException");
        } catch(NoSuchElementException e) {
            // expected
        }
        pool.setFactory(new SimpleFactory());
        Object obj = pool.borrowObject("x");
        assertNotNull(obj);
        pool.returnObject("x",obj);
    }

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