org.apache.geode.modules.session.catalina.callback

Class LocalSessionCacheLoader

java.lang.Object

org.apache.geode.modules.session.catalina.callback.LocalSessionCacheLoader

All Implemented Interfaces:

CacheCallback, CacheLoader<String,javax.servlet.http.HttpSession>, Declarable

public class LocalSessionCacheLoader
extends Object
implements CacheLoader<String,javax.servlet.http.HttpSession>, Declarable

Constructor Summary

Constructors

Constructor and Description
LocalSessionCacheLoader(Region<String,javax.servlet.http.HttpSession> backingRegion)

Method Summary

Modifier and Type	Method and Description
void	close() Called when the region containing this callback is closed or destroyed, when the cache is closed, or when a callback is removed from a region using an AttributesMutator.
javax.servlet.http.HttpSession	load(LoaderHelper<String,javax.servlet.http.HttpSession> helper) Loads a value.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.geode.cache.Declarable

init, initialize

Constructor Detail

LocalSessionCacheLoader

public LocalSessionCacheLoader(Region<String,javax.servlet.http.HttpSession> backingRegion)

Method Detail

load

public javax.servlet.http.HttpSession load(LoaderHelper<String,javax.servlet.http.HttpSession> helper)
                                    throws CacheLoaderException

Description copied from interface: CacheLoader

Loads a value. Application writers should implement this method to customize the loading of a value. This method is called by the caching service when the requested value is not in the cache. Any exception (including an unchecked exception) thrown by this method is propagated back to and thrown by the invocation of Region.get(Object, Object) that triggered this load.

Specified by:

load in interface CacheLoader<String,javax.servlet.http.HttpSession>

Parameters:

helper - a LoaderHelper object that is passed in from cache service and provides access to the key, region, argument, and netSearch.

Returns:

the value supplied for this key, or null if no value can be supplied. A local loader will always be invoked if one exists. Otherwise one remote loader is invoked. Returning null causes Region.get(Object, Object) to return null.

Throws:

CacheLoaderException - if an error occurs. This exception or any other exception thrown by this method will be propagated back to the application from the get method.

See Also:

Region.get

close

public void close()

Description copied from interface: CacheCallback

Called when the region containing this callback is closed or destroyed, when the cache is closed, or when a callback is removed from a region using an AttributesMutator.

Implementations should cleanup any external resources such as database connections. Any runtime exceptions this method throws will be logged.

It is possible for this method to be called multiple times on a single callback instance, so implementations must be tolerant of this.

Specified by:

close in interface CacheCallback

See Also:

RegionService.close(), Region.close(), Region.localDestroyRegion(), Region.destroyRegion(), AttributesMutator