/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package javax.cache;
import java.util.Iterator;
import java.util.ServiceLoader;
import java.util.HashMap;
import java.util.WeakHashMap;
import javax.cache.spi.CachingProvider;
/**
* Provides the capability of dynamically creating a cache.
*
* See the default implementation of this interface in {@link com.caucho.cluster.CacheTemplate}
* for additional methods.
*/
public final class Caching {
public static final String DEFAULT_CACHE_MANAGER_NAME = "__default__";
private Caching()
{
}
public static CacheManager getCacheManager()
{
return getCacheManager(DEFAULT_CACHE_MANAGER_NAME);
}
public static CacheManager getCacheManager(ClassLoader classLoader)
{
return getCacheManager(classLoader, DEFAULT_CACHE_MANAGER_NAME);
}
public static CacheManager getCacheManager(String name)
{
return CachingSingleton.INSTANCE.getCacheManager(name);
}
public static CacheManager getCacheManager(ClassLoader classLoader,
String name)
{
return CachingSingleton.INSTANCE.getCacheManager(classLoader, name);
}
private static final class CachingSingleton {
private static CachingSingleton INSTANCE = new CachingSingleton();
private final CachingProvider _cachingProvider;
private final WeakHashMap<ClassLoader,HashMap<String,CacheManager>> _managerMap
= new WeakHashMap<ClassLoader,HashMap<String,CacheManager>>();
private CachingSingleton()
{
ServiceLoader<CachingProvider> serviceLoader
= ServiceLoader.load(CachingProvider.class);
Iterator<CachingProvider> iter = serviceLoader.iterator();
_cachingProvider = iter.hasNext() ? iter.next() : null;
}
public CacheManager getCacheManager(String name)
{
if (_cachingProvider == null)
throw new IllegalStateException("Cannot find a CachingProvider");
return getCacheManager(_cachingProvider.getDefaultClassLoader(), name);
}
public CacheManager getCacheManager(ClassLoader classLoader,
String name)
{
if (classLoader == null)
throw new NullPointerException();
if (name == null)
throw new NullPointerException();
if (_cachingProvider == null)
throw new IllegalStateException("Cannot find a CachingProvider");
synchronized (_managerMap) {
HashMap<String,CacheManager> map = _managerMap.get(classLoader);
if (map == null) {
map = new HashMap<String,CacheManager>();
_managerMap.put(classLoader, map);
}
CacheManager manager = map.get(name);
if (manager == null) {
manager = _cachingProvider.createCacheManager(classLoader, name);
map.put(name, manager);
}
return manager;
}
}
}
}