org.d_haven.mpool

Class VariableSizePool

java.lang.Object

org.d_haven.mpool.AbstractPool

org.d_haven.mpool.VariableSizePool

All Implemented Interfaces:

ManagablePool, Pool

public final class VariableSizePool
extends AbstractPool
implements ManagablePool

This is an Pool that caches Poolable objects for reuse. Please note that this pool offers no resource limiting whatsoever.

Version:

CVS $Revision: 1.9 $ $Date: 2004/06/21 17:03:46 $

Author:

Berin Loritsch

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.LinkedList	m_buffer
private boolean	m_disposed

Constructor Summary

Constructors

Constructor and Description
VariableSizePool(ObjectFactory factory, int size) Create a VariableSizePool with the supplied factory and initial size.

Method Summary

Modifier and Type	Method and Description
void	dispose() Dispose of this pool so that it is empty an no longer used.
protected java.lang.Object	doAcquire() Perform the actual work of acquiring the object from the pool.
protected boolean	doRelease(java.lang.Object pooledObject) Perform the actual logic to release the pooled object back to the pool.
void	grow(int byNum) Grow by the specified amount.
private java.lang.Object	popLast()
void	shrink(int byNum) Shrink the pool by the specified amount.
int	size() Determine the pool's current size.
java.lang.String	toString()

Methods inherited from class org.d_haven.mpool.AbstractPool

acquire, addPoolListener, disposeInstance, fireAquiredEvent, fireCreatedEvent, fireCreationFailedEvent, fireDisposedEvent, fireDisposeFailedEvent, fireReleasedEvent, getPoolListeners, newInstance, release, removePoolListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.d_haven.mpool.Pool

acquire, addPoolListener, release, removePoolListener

Field Detail

m_disposed

private boolean m_disposed

m_buffer

private final java.util.LinkedList m_buffer

Constructor Detail

VariableSizePool

public VariableSizePool(ObjectFactory factory,
                        int size)
                 throws java.lang.Exception

Create a VariableSizePool with the supplied factory and initial size.

Parameters:

factory - the factory to use to create objects

size - the initial number of elements to create

Throws:

java.lang.Exception - if there is a problem creating the pooled objects

Method Detail

doAcquire

protected java.lang.Object doAcquire()
                              throws java.lang.Exception

Description copied from class: AbstractPool

Perform the actual work of acquiring the object from the pool.

Specified by:

doAcquire in class AbstractPool

Returns:

the acquired object or null if there are none left

Throws:

java.lang.Exception - if there was a problem acquiring the object

popLast

private java.lang.Object popLast()

doRelease

protected boolean doRelease(java.lang.Object pooledObject)

Description copied from class: AbstractPool

Perform the actual logic to release the pooled object back to the pool.

Specified by:

doRelease in class AbstractPool

Parameters:

pooledObject - the object to release

Returns:

true if we also need to dispose of the object

dispose

public void dispose()

Dispose of this pool so that it is empty an no longer used.

shrink

public void shrink(int byNum)

Description copied from interface: ManagablePool

Shrink the pool by the specified amount. The pool should trust the Controller, but be smart enough not to achieve a negative pool size. In other words, you should clip the shrink amount so that the pool does not go below 0.

Specified by:

shrink in interface ManagablePool

Parameters:

byNum - an integer amount to decrease the pool size by.

grow

public void grow(int byNum)

Description copied from interface: ManagablePool

Grow by the specified amount. The pool should trust the Controller for the Grow size.

Specified by:

grow in interface ManagablePool

Parameters:

byNum - an integer amount to increase the pool size by.

size

public int size()

Description copied from interface: ManagablePool

Determine the pool's current size. The size is defined as the number of Poolable objects in reserve.

Specified by:

size in interface ManagablePool

Returns:

size of pool's reserve.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object