com.j_spaces.kernel.pool

Class ResourcePool<R extends IResource>

java.lang.Object

com.j_spaces.kernel.pool.ResourcePool<R>

All Implemented Interfaces:

IResourcePool<R>

Direct Known Subclasses:

BlockingResourcePool, MemoryBoundedResourcePool

public class ResourcePool<R extends IResource>
extends Object
implements IResourcePool<R>

A Bound Pool of Resource objects. At construction, the pool consumes as many as minResources resources. When a resource requests is submitted, and less than maxResources are being used, a free resource will be returned from the pool. When all resources are in use, a new Resource will be allocated by the resourceFactory. There can be no more than maxResources in the pool, and excessive resources are discarded.

Field Summary

Fields

Modifier and Type	Field and Description
protected R[]	_resourcesPool pool of resources

Constructor Summary

Constructors

Modifier	Constructor and Description
	ResourcePool(IResourceFactory<R> resourceFactory, int minResources, int maxResources) Creates a new Resources Pool with the specified resourceFactory, and max Resources.
protected	ResourcePool(IResourceFactory<R> resourceFactory, int minResources, int maxResources, R[] initialResources) Creates a new Resources Pool with the specified resourceFactory, and max Resources.

Method Summary

Modifier and Type	Method and Description
int	availableResources()
protected R	findFreeResource()
void	forAllResources(IResourceProcedure<R> procedure)
void	freeResource(R resourceToFree) Free the specified resource.
R	getResource() Returns a Resource from the pool.
protected R	handleFullPool()
int	size()
protected R	tryAllocateNewPooledResource()

Methods inherited from class java.lang.Object

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

Field Detail

_resourcesPool

protected final R extends IResource[] _resourcesPool

pool of resources

Constructor Detail

ResourcePool

public ResourcePool(IResourceFactory<R> resourceFactory,
                    int minResources,
                    int maxResources)

Creates a new Resources Pool with the specified resourceFactory, and max Resources.

Parameters:

resourceFactory - resource factory instance for new resources

minResources - resources to pre-allocate; can be zero

maxResources - upper bound on the number of resources

ResourcePool

protected ResourcePool(IResourceFactory<R> resourceFactory,
                       int minResources,
                       int maxResources,
                       R[] initialResources)

Creates a new Resources Pool with the specified resourceFactory, and max Resources.

Parameters:

resourceFactory - resource factory instance for new resources

minResources - resources to pre-allocate; can be zero

maxResources - upper bound on the number of resources

initialResources - initial array of resources to init the pool with

Method Detail

getResource

public R getResource()

Returns a Resource from the pool. If there is an un-used Resource in the pool, it is returned; otherwise, a new Resource is created and added to the pool.

Specified by:

getResource in interface IResourcePool<R extends IResource>

Returns:

free Resource allocated to this request

tryAllocateNewPooledResource

protected R tryAllocateNewPooledResource()

findFreeResource

protected R findFreeResource()

handleFullPool

protected R handleFullPool()

freeResource

public void freeResource(R resourceToFree)

Free the specified resource. Same as calling IResource.release()

Specified by:

freeResource in interface IResourcePool<R extends IResource>

availableResources

public int availableResources()

Specified by:

availableResources in interface IResourcePool<R extends IResource>

size

public int size()

Specified by:

size in interface IResourcePool<R extends IResource>

forAllResources

public void forAllResources(IResourceProcedure<R> procedure)

Specified by:

forAllResources in interface IResourcePool<R extends IResource>