no.sesat.search.site
Class AbstractSiteKeyedFactory

java.lang.Object
  no.sesat.search.site.AbstractSiteKeyedFactory

All Implemented Interfaces:

SiteKeyedFactory

public abstract class AbstractSiteKeyedFactory
extends Object
implements SiteKeyedFactory

Abstract implementation of a SiteKeyedFactory to help with the INSTANCES map and locking pattern typically used around it using ReentrantReadWriteLocks.

Version:

$Id: AbstractSiteKeyedFactory.java 7225 2009-04-09 00:32:20Z ssmiweve $

Nested Class Summary

protected static interface

AbstractSiteKeyedFactory.FactoryConstructor<T extends AbstractSiteKeyedFactory> Wraps a constructor so that it may be delegated to from the instanceOf method.

Constructor Summary

protected

AbstractSiteKeyedFactory()

Method Summary

protected static <T extends AbstractSiteKeyedFactory> T

instanceOf(Site site, Map<Site,T> instances, ReentrantReadWriteLock instancesLock, AbstractSiteKeyedFactory.FactoryConstructor<T> constructor) Handles the locking pattern around the INSTANCES map that's done with a ReentrantReadWriteLock.

Methods inherited from class java.lang.Object

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

Methods inherited from interface no.sesat.search.site.SiteKeyedFactory

remove

Constructor Detail

AbstractSiteKeyedFactory

protected AbstractSiteKeyedFactory()

Method Detail

instanceOf

protected static final <T extends AbstractSiteKeyedFactory> T instanceOf(Site site,
                                                                         Map<Site,T> instances,
                                                                         ReentrantReadWriteLock instancesLock,
                                                                         AbstractSiteKeyedFactory.FactoryConstructor<T> constructor)

Handles the locking pattern around the INSTANCES map that's done with a ReentrantReadWriteLock.

Type Parameters:

T - the type of SiteKeyedFactory that can be constructed.

Parameters:

site - the site this factory will answer to.

instances - the map of factories of type T already in existence.

instancesLock - the lock used around the instances map

constructor - the wrapper around the constructor used to create factories of type T.

Returns:

the singleton instance of factory of type T related to the given site.

See Also:

http://permalink.gmane.org/gmane.comp.java.sesat.kernel.devel/228