org.d_haven.mpool

Class FixedSizePool

java.lang.Object

org.d_haven.mpool.AbstractPool

org.d_haven.mpool.FixedSizePool

All Implemented Interfaces:

Pool

public final class FixedSizePool
extends AbstractPool

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

Version:

CVS $Revision: 1.11 $ $Date: 2004/06/21 17:03:46 $

Author:

Berin Loritsch

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.List	m_buffer
private boolean	m_disposed
private long	m_stepTime
private long	m_timeout

Constructor Summary

Constructors

Constructor and Description
FixedSizePool(ObjectFactory factory, int size) Create a fixed size pool using the object factory and size supplied.
FixedSizePool(ObjectFactory factory, int size, long timeout) Create a fixed size pool using the object factory, size, and timeout supplied.

Method Summary

Modifier and Type	Method and Description
void	dispose() Dispose this pool and remove all elements.
protected java.lang.Object	doAcquire() Perform the actual work of acquiring the object from the pool.
protected boolean	doRelease(java.lang.Object object) Perform the actual logic to release the pooled object back to the pool.
long	getTimeout() Get the timeout in milliseconds for this pool.
private java.lang.Object	popLast()
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

Field Detail

m_disposed

private boolean m_disposed

m_buffer

private final java.util.List m_buffer

m_timeout

private final long m_timeout

m_stepTime

private final long m_stepTime

Constructor Detail

FixedSizePool

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

Create a fixed size pool using the object factory and size supplied. The pool will use the defuault timeout of -1 (don't block at all) so it will fail early.

Parameters:

factory - the factory to use for the pool

size - the number of items in the pool (hard limit)

Throws:

java.lang.Exception - if there is a problem creating any of the items in the pool

FixedSizePool

public FixedSizePool(ObjectFactory factory,
                     int size,
                     long timeout)
              throws java.lang.Exception

Create a fixed size pool using the object factory, size, and timeout supplied. A timeout of -1 will not block at all. A timeout of 0 will block indefinitely. A timeout of 1 or more will block for that number of milliseconds.

Parameters:

factory - the factory to use for the pool

size - the number of items in the pool (hard limit)

timeout - the timeout in milliseconds to use.

Throws:

java.lang.Exception - if there is a problem creating any of the items in the pool

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 object)

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:

object - the object to release

Returns:

true if we also need to dispose of the object

dispose

public void dispose()

Dispose this pool and remove all elements.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getTimeout

public long getTimeout()

Get the timeout in milliseconds for this pool.

Returns:

the timeout in milliseconds