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## 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 898032 2010-01-11 19:51:03Z nbubna $
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
  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)`

### enumerateKeys

    public Iterator 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()`

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