/*
* JBoss, Home of Professional Open Source
* Copyright 2006, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.metadata.plugins.cache;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import org.jboss.logging.Logger;
import org.jboss.util.CachePolicy;
/**
* Cache policy cache factory.
*
* @author <a href="mailto:ales.justin@jboss.com">Ales Justin</a>
*/
public class CachePolicyCacheFactory implements CacheFactory
{
private static final Logger log = Logger.getLogger(CachePolicyCacheFactory.class);
private CachePolicyFactory factory;
private List<CachePolicy> policies;
public CachePolicyCacheFactory(CachePolicyFactory factory)
{
if (factory == null)
throw new IllegalArgumentException("Null factory");
this.factory = factory;
this.policies = new ArrayList<CachePolicy>();
}
public String createFqn(Object owner)
{
return null;
}
/**
* Create cache policy.
*
* @return the cache policy
*/
protected CachePolicy createCachePolicy()
{
try
{
CachePolicy policy = factory.createCachePolicy();
policy.create();
policy.start();
policies.add(policy);
return policy;
}
catch (Exception e)
{
if (e instanceof RuntimeException)
throw (RuntimeException)e;
else
throw new RuntimeException(e);
}
}
public <K, V> Cache<K, V> createCache(Class<K> keyClass, Class<V> valueClass, String rootFqn)
{
return new CachePolicyCache<K,V>(createCachePolicy());
}
public <V> CacheItem<V> createCacheItem(Class<V> valueClass, String rootFqn)
{
return new CachePolicyCacheItem<V>(createCachePolicy());
}
/**
* Stop created policies.
*/
public void stop()
{
ListIterator<CachePolicy> iter = policies.listIterator(policies.size());
while(iter.hasPrevious())
{
CachePolicy policy = iter.previous();
try
{
policy.stop();
}
catch (Throwable t)
{
log.debug("Exception while stopping policy: " + policy + ", problem: " + t);
}
}
}
/**
* Destroy created policies.
*/
public void destroy()
{
ListIterator<CachePolicy> iter = policies.listIterator(policies.size());
while(iter.hasPrevious())
{
CachePolicy policy = iter.previous();
try
{
policy.destroy();
}
catch (Throwable t)
{
log.debug("Exception while destroying policy: " + policy + ", problem: " + t);
}
}
policies.clear();
}
@SuppressWarnings("unchecked")
private static class CachePolicyCache<K, V> implements Cache<K, V>
{
private CachePolicy policy;
private CachePolicyCache(CachePolicy policy)
{
if (policy == null)
throw new IllegalArgumentException("Null policy");
this.policy = policy;
}
public V put(K key, V value)
{
V old = (V)policy.get(key);
policy.insert(key, value);
return old;
}
public V get(K key)
{
return (V)policy.get(key);
}
public V remove(K key)
{
V old = (V)policy.get(key);
policy.remove(key);
return old;
}
public void clear()
{
policy.flush();
}
}
private static class CachePolicyCacheItem<V> extends CachePolicyCache<Object, V> implements CacheItem<V>
{
private static final Object KEY = "<KEY>";
private CachePolicyCacheItem(CachePolicy policy)
{
super(policy);
}
public V put(V value)
{
return put(KEY, value);
}
public V get()
{
return get(KEY);
}
}
}