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org.apache.cocoon.components.store.impl
Class EHDefaultStore

java.lang.Object
  org.apache.avalon.framework.logger.AbstractLogEnabled
      org.apache.cocoon.components.store.impl.EHDefaultStore

All Implemented Interfaces:

Disposable, Initializable, Component, Contextualizable, LogEnabled, Parameterizable, Serviceable, ThreadSafe, Store

public class EHDefaultStore
extends AbstractLogEnabled
implements Store, Contextualizable, Serviceable, Parameterizable, Initializable, Disposable, ThreadSafe

Store implementation based on EHCache. (http://ehcache.sourceforge.net/)

Version:

$Id: EHDefaultStore.html 1304258 2012-03-23 10:09:27Z ilgrosso $

Field Summary

Fields inherited from interface org.apache.excalibur.store.Store

PERSISTENT_STORE, ROLE, TRANSIENT_STORE

Constructor Summary

EHDefaultStore()

Method Summary

void	clear()
boolean	containsKey(Object key)
void	contextualize(Context context)
void	dispose() Shutdown the CacheManager.
void	free()
Object	get(Object key)
void	initialize() Initialize the CacheManager and created the Cache.
Enumeration	keys()
void	parameterize(Parameters parameters) Configure the store.
void	remove(Object key)
void	service(ServiceManager aManager)
int	size()
void	store(Object key, Object value)

Methods inherited from class org.apache.avalon.framework.logger.AbstractLogEnabled

enableLogging, getLogger, setupLogger, setupLogger, setupLogger

Methods inherited from class java.lang.Object

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

Constructor Detail

EHDefaultStore

public EHDefaultStore()

Method Detail

contextualize

public void contextualize(Context context)
                   throws ContextException

Specified by:

contextualize in interface Contextualizable

Throws:

ContextException

service

public void service(ServiceManager aManager)
             throws ServiceException

Specified by:

service in interface Serviceable

Throws:

ServiceException

parameterize

public void parameterize(Parameters parameters)
                  throws ParameterException

Configure the store. The following options can be used:

• maxobjects (10000) - The maximum number of objects in memory.
• overflow-to-disk (true) - Whether to spool elements to disk after maxobjects has been exceeded.
• eternal (true) - whether or not entries expire. When set to false the timeToLiveSeconds and timeToIdleSeconds parameters are used to determine when an item expires.
• timeToLiveSeconds (0) - how long an entry may live in the cache before it is removed. The entry will be removed no matter how frequently it is retrieved.
• timeToIdleSeconds (0) - the maximum time between retrievals of an entry. If the entry is not retrieved for this period, it is removed from the cache.
• use-cache-directory (false) - If true the cache-directory context entry will be used as the location of the disk store. Within the servlet environment this is set in web.xml.
• use-work-directory (false) - If true the work-directory context entry will be used as the location of the disk store. Within the servlet environment this is set in web.xml.
• directory - Specify an alternative location of the disk store.

Setting eternal to false but not setting timeToLiveSeconds and/or timeToIdleSeconds, has the same effect as setting eternal to true.

Here is an example to clarify the purpose of the timeToLiveSeconds and timeToIdleSeconds parameters:

• timeToLiveSeconds = 86400 (1 day)
• timeToIdleSeconds = 10800 (3 hours)

With these settings the entry will be removed from the cache after 24 hours. If within that 24-hour period the entry is not retrieved within 3 hours after the last retrieval, it will also be removed from the cache.

By setting timeToLiveSeconds to 0, an item can stay in the cache as long as it is retrieved within timeToIdleSeconds after the last retrieval.

By setting timeToIdleSeconds to 0, an item will stay in the cache for exactly timeToLiveSeconds.

disk-persistent Whether the disk store persists between restarts of the Virtual Machine. The default value is true.

Specified by:

parameterize in interface Parameterizable

Throws:

ParameterException

initialize

public void initialize()
                throws Exception

Initialize the CacheManager and created the Cache.

Specified by:

initialize in interface Initializable

Throws:

Exception

dispose

public void dispose()

Shutdown the CacheManager.

Specified by:

dispose in interface Disposable

get

public Object get(Object key)

Specified by:

get in interface Store

store

public void store(Object key,
                  Object value)
           throws IOException

Specified by:

store in interface Store

Throws:

IOException

free

public void free()

Specified by:

free in interface Store

remove

public void remove(Object key)

Specified by:

remove in interface Store

clear

public void clear()

Specified by:

clear in interface Store

containsKey

public boolean containsKey(Object key)

Specified by:

containsKey in interface Store

keys

public Enumeration keys()

Specified by:

keys in interface Store

size

public int size()

Specified by:

size in interface Store