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 (identified 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 1780734 2017-01-28 19:21:08Z cbrisson $

Author:

Geir Magnusson Jr., Daniel Rall

Field Summary

Fields

Modifier and Type	Field and Description
protected Map<Object,Resource>	cache Cache storage, assumed to be thread-safe.
protected org.slf4j.Logger	log
protected RuntimeServices	rsvc Runtime services, generally initialized by the initialize() method.

Constructor Summary

Constructors

Constructor and Description
ResourceCacheImpl()

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all of the resources from this cache.
Iterator<Object>	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<Object,Resource> cache

Cache storage, assumed to be thread-safe.

rsvc

protected RuntimeServices rsvc

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

log

protected org.slf4j.Logger log

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

See Also:

ResourceCache.initialize(org.apache.velocity.runtime.RuntimeServices)

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

See Also:

ResourceCache.get(java.lang.Object)

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

See Also:

ResourceCache.put(java.lang.Object, org.apache.velocity.runtime.resource.Resource)

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:

stored under key

See Also:

ResourceCache.remove(java.lang.Object)

clear

public void clear()

Description copied from interface: ResourceCache

Removes all of the resources from this cache. The cache will be empty after this call returns.

Specified by:

clear in interface ResourceCache

Since:

2.0

See Also:

ResourceCache.clear()

enumerateKeys

public Iterator<Object> enumerateKeys()

Description copied from interface: ResourceCache

returns an Iterator of Keys in the cache.

Specified by:

enumerateKeys in interface ResourceCache

Returns:

An Iterator of Keys in the cache.

See Also:

ResourceCache.enumerateKeys()