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Java Source Code / Java Documentation » Database JDBC Connection Pool » Apache commons pool 1.3 » org.apache.commons.pool

Source Cross Reference Class Diagram Java Document (Java Doc)

org.apache.commons.pool .KeyedPoolableObjectFactory

All known Subclasses:   org.apache.commons.pool .BaseKeyedPoolableObjectFactory,
KeyedPoolableObjectFactory
public interface KeyedPoolableObjectFactory (Code)
An interface defining life-cycle methods for instances to be served by a KeyedObjectPool KeyedObjectPool .
By contract, when an KeyedObjectPool KeyedObjectPool delegates to a KeyedPoolableObjectFactory,

KeyedPoolableObjectFactory.makeObject makeObject is called whenever a new instance is needed.

KeyedPoolableObjectFactory.activateObject activateObject is invoked on every instance before it is returned from the pool.

KeyedPoolableObjectFactory.passivateObject passivateObject is invoked on every instance when it is returned to the pool.

KeyedPoolableObjectFactory.destroyObject destroyObject is invoked on every instance when it is being "dropped" from the pool (whether due to the response from KeyedPoolableObjectFactory.validateObject validateObject , or for reasons specific to the pool implementation.)

KeyedPoolableObjectFactory.validateObject validateObject is invoked in an implementation-specific fashion to determine if an instance is still valid to be returned by the pool. It will only be invoked on an KeyedPoolableObjectFactory.activateObject "activated" instance.

See Also:   KeyedObjectPool
author:
   Rodney Waldhoff
version:
   $Revision: 155430 $ $Date: 2005-02-26 08:13:28 -0500 (Sat, 26 Feb 2005) $

Method Summary
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.
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 pool.
boolean validateObject(Object key, Object obj)
     Ensures that the instance is safe to be returned by the pool.

Method Detail
activateObject
void activateObject(Object key, Object obj) throws Exception(Code)
Reinitialize an instance to be returned by the pool.
Parameters:
  key - the key used when selecting the object
Parameters:
  obj - the instance to be activated

destroyObject
void destroyObject(Object key, Object obj) throws Exception(Code)
Destroy an instance no longer needed by the pool.
Parameters:
  key - the key used when selecting the instance
Parameters:
  obj - the instance to be destroyed

makeObject
Object makeObject(Object key) throws Exception(Code)
Create an instance that can be served by the pool.
Parameters:
  key - the key used when constructing the object an instance that can be served by the pool.

passivateObject
void passivateObject(Object key, Object obj) throws Exception(Code)
Uninitialize an instance to be returned to the pool.
Parameters:
  key - the key used when selecting the object
Parameters:
  obj - the instance to be passivated

validateObject
boolean validateObject(Object key, Object obj)(Code)
Ensures that the instance is safe to be returned by the pool. Returns false if this instance should be destroyed.
Parameters:
  key - the key used when selecting the object
Parameters:
  obj - the instance to be validated false if this obj is not valid and shouldbe dropped from the pool, true otherwise.

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