org.apache.velocity.runtime.resource
Class ResourceCacheImpl

java.lang.Object
  org.apache.velocity.runtime.resource.ResourceCacheImpl

All Implemented Interfaces:

ResourceCache

public class ResourceCacheImpl
extends Object
implements ResourceCache

Default implementation of the resource cache for the default ResourceManager. The cache uses a least recently used (LRU) algorithm, with a maximum size specified via the resource.manager.cache.size property (idenfied by the RuntimeConstants.RESOURCE_MANAGER_DEFAULTCACHE_SIZE constant). This property get be set to 0 or less for a greedy, unbounded cache (the behavior from pre-v1.5).

Version:

$Id: ResourceCacheImpl.java 191743 2005-06-21 23:22:20Z dlr $

Author:

Geir Magnusson Jr., Daniel Rall

Field Summary

protected Map	cache Cache storage, assumed to be thread-safe.
protected RuntimeServices	rsvc Runtime services, generally initialized by the initialize() method.

Constructor Summary

ResourceCacheImpl()

Method Summary

Iterator	enumerateKeys() returns an Iterator of Keys in the cache
Resource	get(Object key) retrieves a Resource from the cache
void	initialize(RuntimeServices rs) initializes the ResourceCache.
Resource	put(Object key, Resource value) stores a Resource in the cache
Resource	remove(Object key) removes a Resource from the cache

Methods inherited from class java.lang.Object

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

Field Detail

cache

protected Map cache

Cache storage, assumed to be thread-safe.

rsvc

protected RuntimeServices rsvc

Runtime services, generally initialized by the initialize() method.

Constructor Detail

ResourceCacheImpl

public ResourceCacheImpl()

Method Detail

initialize

public void initialize(RuntimeServices rs)

Description copied from interface: ResourceCache

initializes the ResourceCache. Will be called before any utilization

Specified by:

initialize in interface ResourceCache

Parameters:

rs - RuntimeServices to use for logging, etc

get

public Resource get(Object key)

Description copied from interface: ResourceCache

retrieves a Resource from the cache

Specified by:

get in interface ResourceCache

Parameters:

key - key for Resource to be retrieved

Returns:

Resource specified or null if not found

put

public Resource put(Object key,
                    Resource value)

Description copied from interface: ResourceCache

stores a Resource in the cache

Specified by:

put in interface ResourceCache

Parameters:

key - key to associate with the Resource

value - Resource to be stored

Returns:

existing Resource stored under this key, or null if none

remove

public Resource remove(Object key)

Description copied from interface: ResourceCache

removes a Resource from the cache

Specified by:

remove in interface ResourceCache

Parameters:

key - resource to be removed

Returns:

Resource stored under key

enumerateKeys

public Iterator enumerateKeys()

Description copied from interface: ResourceCache

returns an Iterator of Keys in the cache

Specified by:

enumerateKeys in interface ResourceCache