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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 .PoolableObjectFactory

All known Subclasses:   org.apache.commons.pool .BasePoolableObjectFactory,  org.apache.commons.pool.performance .SleepingObjectFactory,
PoolableObjectFactory
public interface PoolableObjectFactory (Code)
An interface defining life-cycle methods for instances to be used in an ObjectPool ObjectPool .
By contract, when an ObjectPool ObjectPool delegates to a PoolableObjectFactory,

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

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

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

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

PoolableObjectFactory.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 PoolableObjectFactory.activateObject "activated" instance.

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

Method Summary
void activateObject(Object obj)
     Reinitialize an instance to be returned by the pool.
void destroyObject(Object obj)
     Destroys an instance no longer needed by the pool.
Object makeObject()
     Creates an instance that can be returned by the pool.
void passivateObject(Object obj)
     Uninitialize an instance to be returned to the pool.
boolean validateObject(Object obj)
     Ensures that the instance is safe to be returned by the pool.

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

destroyObject
void destroyObject(Object obj) throws Exception(Code)
Destroys an instance no longer needed by the pool.
Parameters:
  obj - the instance to be destroyed

makeObject
Object makeObject() throws Exception(Code)
Creates an instance that can be returned by the pool. an instance that can be returned by the pool.

passivateObject
void passivateObject(Object obj) throws Exception(Code)
Uninitialize an instance to be returned to the pool.
Parameters:
  obj - the instance to be passivated

validateObject
boolean validateObject(Object obj)(Code)
Ensures that the instance is safe to be returned by the pool. Returns false if this object should be destroyed.
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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