org.datanucleus.store.rdbms.datasource.dbcp.pool

Class BaseKeyedPoolableObjectFactory

java.lang.Object

org.datanucleus.store.rdbms.datasource.dbcp.pool.BaseKeyedPoolableObjectFactory

All Implemented Interfaces:

KeyedPoolableObjectFactory

public abstract class BaseKeyedPoolableObjectFactory
extends Object
implements KeyedPoolableObjectFactory

A base implementation of KeyedPoolableObjectFactory.

All operations defined here are essentially no-op's.

Since:

Pool 1.0

Version:

$Revision: 791907 $ $Date: 2009-07-07 12:56:33 -0400 (Tue, 07 Jul 2009) $

Author:

Rodney Waldhoff

See Also:

KeyedPoolableObjectFactory

Constructor Summary

Constructors

Constructor and Description
BaseKeyedPoolableObjectFactory()

Method Summary

Methods

Modifier and Type	Method and Description
void	activateObject(Object key, Object obj) Reinitialize an instance to be returned by the pool.
void	destroyObject(Object key, Object obj) Destroy an instance no longer needed by the pool.
abstract Object	makeObject(Object key) Create an instance that can be served by the pool.
void	passivateObject(Object key, Object obj) Uninitialize an instance to be returned to the idle object pool.
boolean	validateObject(Object key, Object obj) Ensures that the instance is safe to be returned by the pool.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BaseKeyedPoolableObjectFactory

public BaseKeyedPoolableObjectFactory()

Method Detail

makeObject

public abstract Object makeObject(Object key)
                           throws Exception

Create an instance that can be served by the pool.

Specified by:

makeObject in interface KeyedPoolableObjectFactory

Parameters:

key - the key used when constructing the object

Returns:

an instance that can be served by the pool

Throws:

Exception - if there is a problem creating a new instance, this will be propagated to the code requesting an object.

destroyObject

public void destroyObject(Object key,
                 Object obj)
                   throws Exception

Destroy an instance no longer needed by the pool.

The default implementation is a no-op.

Specified by:

destroyObject in interface KeyedPoolableObjectFactory

Parameters:

key - the key used when selecting the instance

obj - the instance to be destroyed

Throws:

Exception - should be avoided as it may be swallowed by the pool implementation.

See Also:

KeyedPoolableObjectFactory.validateObject(java.lang.Object, java.lang.Object), KeyedObjectPool.invalidateObject(java.lang.Object, java.lang.Object)

validateObject

public boolean validateObject(Object key,
                     Object obj)

Ensures that the instance is safe to be returned by the pool.

The default implementation always returns true.

Specified by:

validateObject in interface KeyedPoolableObjectFactory

Parameters:

key - the key used when selecting the object

obj - the instance to be validated

Returns:

always true in the default implementation

activateObject

public void activateObject(Object key,
                  Object obj)
                    throws Exception

Reinitialize an instance to be returned by the pool.

The default implementation is a no-op.

Specified by:

activateObject in interface KeyedPoolableObjectFactory

Parameters:

key - the key used when selecting the object

obj - the instance to be activated

Throws:

Exception - if there is a problem activating obj, this exception may be swallowed by the pool.

See Also:

KeyedPoolableObjectFactory.destroyObject(java.lang.Object, java.lang.Object)

passivateObject

public void passivateObject(Object key,
                   Object obj)
                     throws Exception

Uninitialize an instance to be returned to the idle object pool.

The default implementation is a no-op.

Specified by:

passivateObject in interface KeyedPoolableObjectFactory

Parameters:

key - the key used when selecting the object

obj - the instance to be passivated

Throws:

Exception - if there is a problem passivating obj, this exception may be swallowed by the pool.

See Also:

KeyedPoolableObjectFactory.destroyObject(java.lang.Object, java.lang.Object)