com.sun.enterprise.resource.pool.datastructure

Class RWLockDataStructure

java.lang.Object

com.sun.enterprise.resource.pool.datastructure.RWLockDataStructure

All Implemented Interfaces:

DataStructure

public class RWLockDataStructure
extends Object
implements DataStructure

ReadWriteLock based datastructure for pool

Author:

Jagadish Ramu

Field Summary

Fields

Modifier and Type	Field and Description
protected static Logger	_logger

Fields inherited from interface com.sun.enterprise.resource.pool.datastructure.DataStructure

DS_TYPE_CIRCULAR_LIST, DS_TYPE_DEFAULT, DS_TYPE_PARTITIONED

Constructor Summary

Constructors

Constructor and Description
RWLockDataStructure(String parameters, int maxSize, ResourceHandler handler, String strategyClass)

Method Summary

Modifier and Type	Method and Description
int	addResource(ResourceAllocator allocator, int count) creates a new resource and adds to the datastructure.
ArrayList<ResourceHandle>	getAllResources() Get all resources in the datastructure Note : do not use this for normal usages as it can potentially represent all resources (including the ones in use).
int	getFreeListSize() get the count of free resources in the datastructure
ResourceHandle	getResource() get a resource from the datastructure
int	getResourcesSize() get total number of resources in the datastructure
void	removeAll() remove & destroy all resources from the datastructure.
void	removeResource(ResourceHandle resource) remove the specified resource from the datastructure
void	returnResource(ResourceHandle resource) returns the resource to the datastructure
void	setMaxSize(int maxSize) Set maxSize based on the new max pool size set on the connection pool during a reconfiguration.

Methods inherited from class java.lang.Object

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

Field Detail

_logger

protected static final Logger _logger

Constructor Detail

RWLockDataStructure

public RWLockDataStructure(String parameters,
                           int maxSize,
                           ResourceHandler handler,
                           String strategyClass)

Method Detail

addResource

public int addResource(ResourceAllocator allocator,
                       int count)
                throws PoolingException

creates a new resource and adds to the datastructure.

Specified by:

addResource in interface DataStructure

Parameters:

allocator - ResourceAllocator

count - Number (units) of resources to create

Returns:

int number of resources added.

Throws:

PoolingException - when unable to create a resource

getResource

public ResourceHandle getResource()

get a resource from the datastructure

Specified by:

getResource in interface DataStructure

Returns:

ResourceHandle

removeResource

public void removeResource(ResourceHandle resource)

remove the specified resource from the datastructure

Specified by:

removeResource in interface DataStructure

Parameters:

resource - ResourceHandle

returnResource

public void returnResource(ResourceHandle resource)

returns the resource to the datastructure

Specified by:

returnResource in interface DataStructure

Parameters:

resource - ResourceHandle

getFreeListSize

public int getFreeListSize()

get the count of free resources in the datastructure

Specified by:

getFreeListSize in interface DataStructure

Returns:

int count

removeAll

public void removeAll()

remove & destroy all resources from the datastructure.

Specified by:

removeAll in interface DataStructure

getResourcesSize

public int getResourcesSize()

get total number of resources in the datastructure

Specified by:

getResourcesSize in interface DataStructure

Returns:

int count

setMaxSize

public void setMaxSize(int maxSize)

Set maxSize based on the new max pool size set on the connection pool during a reconfiguration.

Specified by:

setMaxSize in interface DataStructure

Parameters:

maxSize -

getAllResources

public ArrayList<ResourceHandle> getAllResources()

Description copied from interface: DataStructure

Get all resources in the datastructure Note : do not use this for normal usages as it can potentially represent all resources (including the ones in use). This is used under special circumstances where there is a need to process all resources.

Specified by:

getAllResources in interface DataStructure

Returns:

ArrayList