| org.apache.cocoon.components.store.MRUMemoryStore
| MRUMemoryStore | | final public class MRUMemoryStore extends AbstractLogEnabled implements Store,Parameterizable,Composable,Disposable,ThreadSafe(Code) | | This class provides a cache algorithm for the requested documents.
It combines a HashMap and a LinkedList to create a so called MRU
(Most Recently Used) cache.
This implementation is based on MRUBucketMap - map with efficient
O(1) implementation of MRU removal policy.
TODO: Port improvments to the Excalibur implementation
author:
Gerhard Froehlich
author:
Davanum Srinivas
author:
Vadim Gritsenko
version:
CVS $Id: MRUMemoryStore.java 433543 2006-08-22 06:22:54Z crossley $ |
| Method Summary | |
| public void | compose(ComponentManager manager)
| | public boolean | containsKey(Object key)
Indicates if the given key is associated to a contained object. | | public void | dispose()
| | public void | free()
Frees some of the fast memory used by this store. | | public Object | get(Object key)
Get the object associated to the given unique key. | | public void | hold(Object key, Object value)
This method holds the requested object in a HashMap combined
with a LinkedList to create the MRU. | | public Enumeration | keys()
Returns the list of used keys as an Enumeration. | | public void | parameterize(Parameters params)
Initialize the MRUMemoryStore. | | public void | remove(Object key)
Remove the object associated to the given key. | | public int | size()
Returns count of the objects in the store, or -1 if could not be
obtained. | | public void | store(Object key, Object value)
Store the given object in a persistent state. |
| compose | | public void compose(ComponentManager manager) throws ComponentException(Code) | | Get components of the ComponentManager
Parameters:
manager - The ComponentManager |
| containsKey | | public boolean containsKey(Object key)(Code) | | Indicates if the given key is associated to a contained object.
Parameters:
key - The key of the object true if the key exists |
| dispose | | public void dispose()(Code) | | Dispose the component
|
| free | | public void free()(Code) | | Frees some of the fast memory used by this store.
It removes the last element in the store.
|
| get | | public Object get(Object key)(Code) | | Get the object associated to the given unique key.
Parameters:
key - The key of the requested object the requested object |
| hold | | public void hold(Object key, Object value)(Code) | | This method holds the requested object in a HashMap combined
with a LinkedList to create the MRU.
It also stores objects onto the filesystem if configured.
Parameters:
key - The key of the object to be stored
Parameters:
value - The object to be stored |
| keys | | public Enumeration keys()(Code) | | Returns the list of used keys as an Enumeration.
the enumeration of the cache |
| parameterize | | public void parameterize(Parameters params) throws ParameterException(Code) | | Initialize the MRUMemoryStore.
A few options can be used:
- maxobjects: Maximum number of objects stored in memory (Default: 100 objects)
- use-persistent-cache: Use persistent cache to keep objects persisted after
container shutdown or not (Default: false)
Parameters:
params - Store parameters
exception:
ParameterException - |
| remove | | public void remove(Object key)(Code) | | Remove the object associated to the given key.
Parameters:
key - The key of to be removed object |
| size | | public int size()(Code) | | Returns count of the objects in the store, or -1 if could not be
obtained.
|
| store | | public void store(Object key, Object value)(Code) | | Store the given object in a persistent state. It is up to the
caller to ensure that the key has a persistent state across
different JVM executions.
Parameters:
key - The key for the object to store
Parameters:
value - The object to store |
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