org.openanzo.server.repository.cache
Class ResourceCache<E extends CachableResource>

java.lang.Object
  org.openanzo.server.repository.cache.ResourceCache<E>

Type Parameters:

E - Cache of Resource objects

public class ResourceCache<E extends CachableResource>
extends java.lang.Object

Provides cached loading and creating and state checking of resources. This is an ever growing cache that is only cleared when clear() is called. For our purposes this is after each request so concurrency issues can be handled exclusively by the database.

Author:

Joe Betz, Matthew Roy ( mroy@cambridgesemantics.com )

Constructor Summary

ResourceCache(java.lang.String cacheName, int cacheSize, CachableResourceFactory<E> cachableFactory, RepositoryConnection repositoryConnection)
Create a new ResourceCache

Method Summary

void	clear() Clear the cache of ids and resources
E	create(java.lang.Long id, boolean forceCreate) Create a server object with the given ID
boolean	isStored(java.lang.Long id) Is the a resource with the given ID stored
E	load(java.lang.Long id) Load a resource

Methods inherited from class java.lang.Object

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

Constructor Detail

ResourceCache

public ResourceCache(java.lang.String cacheName,
                     int cacheSize,
                     CachableResourceFactory<E> cachableFactory,
                     RepositoryConnection repositoryConnection)

Create a new ResourceCache

Parameters:

cacheName - Name of cache

cacheSize - Size of object cache to create

cachableFactory - Factory to create resources

repositoryConnection - RepositoryConnection to query and update database

Method Detail

load

public E load(java.lang.Long id)
                                throws AnzoException

Load a resource

Parameters:

id - Id of resource

Returns:

Resource the given ID

Throws:

AnzoException

create

public E create(java.lang.Long id,
                boolean forceCreate)
                                  throws AnzoException

Create a server object with the given ID

Parameters:

id - ID of server object

forceCreate - Force creation of resource if not created

Returns:

server object for the given ID

Throws:

AnzoException

isStored

public boolean isStored(java.lang.Long id)

Is the a resource with the given ID stored

Parameters:

id - ID of resource

Returns:

true if a resource with the given ID stored

clear

public void clear()

Clear the cache of ids and resources