Package org.codehaus.plexus.util

Class SweeperPool

java.lang.Object

org.codehaus.plexus.util.SweeperPool

public class SweeperPool
extends Object

Pools a bunch of objects . Runs a sweeper periodically to keep it down to size. The objects in the pool first get disposed first.

Author:

Bert van Brakel

Constructor Summary

Constructors

Constructor	Description
SweeperPool(int maxSize, int minSize, int intialCapacity, int sweepInterval, int triggerSize)	There are a number of settings to control how the pool operates.

Method Summary

Modifier and Type	Method	Description
void	dispose()	Dispose of this pool.
Object	get()	Return the pooled object
int	getSize()	Return the number of pooled objects.
void	objectAdded(Object obj)	Override this to be notified of object addition.
void	objectDisposed(Object obj)	Override this to be notified of object disposal.
void	objectRetrieved(Object obj)	Override this to be notified of object retrieval.
boolean	put(Object obj)	Add an object to the pool
void	trim()	Trim the pool down to min size

Methods inherited from class java.lang.Object

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

Constructor Details

SweeperPool

public SweeperPool(int maxSize,
 int minSize,
 int intialCapacity,
 int sweepInterval,
 int triggerSize)

There are a number of settings to control how the pool operates.

Parameters:

maxSize - if the pool has reached this size, any objects added are immediately disposed. If the pool is this size when the sweeper runs, then the pool is also trimmed to minSize irrespective of the triggerSize.

minSize - - this is the size the pool is trimmed to

intialCapacity - the intial capacity

Any value less than 0 is automatically converted to 0

sweepInterval - how often the sweeper runs. Is actually the time since the sweeper last finished a pass. 0 if the sweeper should not run.

triggerSize - - this determines if the pool is trimmed when the sweeper runs. If the pool size is greater or equal than this value then the pool is trimmed to minSize.

Method Details

get

public Object get()

Return the pooled object

Returns:

first available object from the pool

put

public boolean put(Object obj)

Add an object to the pool

Parameters:

obj - the object to pool. Can be null.

Returns:

true if the object was added to the pool, false if it was disposed or null

getSize

public int getSize()

Return the number of pooled objects. This is never greater than t maximum size of the pool

Returns:

the number of pooled objects

dispose

public void dispose()

Dispose of this pool. Stops the sweeper and disposes each object in the pool

trim

public void trim()

Trim the pool down to min size

objectDisposed

public void objectDisposed(Object obj)

Override this to be notified of object disposal. Called after the object has been removed. Occurs when the pool is trimmed.

Parameters:

obj - the Object

objectAdded

public void objectAdded(Object obj)

Override this to be notified of object addition. Called before object is to be added.

Parameters:

obj - the Object

objectRetrieved

public void objectRetrieved(Object obj)

Override this to be notified of object retrieval. Called after object removed from the pool, but before returned to the client.

Parameters:

obj - the Object