Package org.apache.wiki.cache

Class EhcacheCachingManager

java.lang.Object

org.apache.wiki.cache.EhcacheCachingManager

All Implemented Interfaces:

Initializable, CachingManager

public class EhcacheCachingManager
extends java.lang.Object
implements CachingManager, Initializable

Ehcache-based CachingManager.

Field Summary

Fields inherited from interface org.apache.wiki.cache.CachingManager

CACHE_ATTACHMENTS, CACHE_ATTACHMENTS_COLLECTION, CACHE_ATTACHMENTS_DYNAMIC, CACHE_DOCUMENTS, CACHE_PAGES, CACHE_PAGES_HISTORY, CACHE_PAGES_TEXT, PROP_CACHE_CONF_FILE, PROP_CACHE_ENABLE, PROP_USECACHE_DEPRECATED

Constructor Summary

Constructors

Constructor	Description
EhcacheCachingManager()

Method Summary

Modifier and Type	Method	Description
boolean	enabled(java.lang.String cacheName)	Checks if the requested cache is enabled or not.
<T,E extends java.lang.Exception> T	get(java.lang.String cacheName, java.io.Serializable key, CheckedSupplier<T,E> supplier)	Returns an item from a cache.
CacheInfo	info(java.lang.String cacheName)	Retrieves cache usage information.
void	initialize(Engine engine, java.util.Properties props)	Initializes this Engine component.
java.util.List<java.lang.String>	keys(java.lang.String cacheName)	Returns the list of keys from elements present in a cache.
void	put(java.lang.String cacheName, java.io.Serializable key, java.lang.Object val)	Puts an item on a cache.
void	remove(java.lang.String cacheName, java.io.Serializable key)	Removes an item from a cache.
void	shutdown()	Shuts down the underlying cache manager

Methods inherited from class java.lang.Object

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

Constructor Detail

EhcacheCachingManager

public EhcacheCachingManager()

Method Detail

shutdown

public void shutdown()

Shuts down the underlying cache manager

Specified by:

shutdown in interface CachingManager

initialize

public void initialize(Engine engine,
                       java.util.Properties props)
                throws WikiException

Initializes this Engine component. Note that the engine is not fully initialized at this point, so don't do anything fancy here - use lazy init, if you have to.

Specified by:

initialize in interface Initializable

Parameters:

engine - Engine performing the initialization.

props - Properties for setup.

Throws:

WikiException - if an exception occurs while initializing the component.

enabled

public boolean enabled(java.lang.String cacheName)

Checks if the requested cache is enabled or not.

Specified by:

enabled in interface CachingManager

Parameters:

cacheName - The cache to be queried.

Returns:

true if the cache is enabled, false otherwise.

info

public CacheInfo info(java.lang.String cacheName)

Retrieves cache usage information.

Specified by:

info in interface CachingManager

Parameters:

cacheName - The cache to be queried.

Returns:

cache usage information, or null if the requested cache is not enabled.

keys

public java.util.List<java.lang.String> keys(java.lang.String cacheName)

Returns the list of keys from elements present in a cache.

Specified by:

keys in interface CachingManager

Parameters:

cacheName - The cache to be queried.

Returns:

list of keys from elements present in a cache.

get

public <T,E extends java.lang.Exception> T get(java.lang.String cacheName,
                                                     java.io.Serializable key,
                                                     CheckedSupplier<T,E> supplier)
                                              throws E extends java.lang.Exception

Returns an item from a cache. If it is not found on the cache, try to retrieve from the provided supplier. If found there, put the value in the cache, and return it. Otherwise, return null.

Specified by:

get in interface CachingManager

Parameters:

cacheName - The cache in which the item lives.

key - item's identifier.

supplier - if the element is not cached, try to retrieve from the cached system.

Returns:

The requested item or null if either the cache is not enabled or the item is not present on the cache / cached service.

Throws:

E - the supplier may throw a checked exception, which is propagated upwards.

E extends java.lang.Exception

put

public void put(java.lang.String cacheName,
                java.io.Serializable key,
                java.lang.Object val)

Puts an item on a cache.

Specified by:

put in interface CachingManager

Parameters:

cacheName - The cache in which the item will live.

key - item's identifier.

val - item to insert in the cache.

remove

public void remove(java.lang.String cacheName,
                   java.io.Serializable key)

Removes an item from a cache.

Specified by:

remove in interface CachingManager

Parameters:

cacheName - The cache in which the item to be removed lives.

key - item's identifier.