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/**
* ================================================
* LibLoader : a free Java resource loading library
* ================================================
*
* Project Info: http://reporting.pentaho.org/libloader/
*
* (C) Copyright 2006, by Pentaho Corporation and Contributors.
*
* This library 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 library 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
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
*
* ------------
* $Id: OSResourceDataCache.java 3520 2007-10-16 10:34:47Z tmorgner $
* ------------
* (C) Copyright 2006, by Pentaho Corporation.
*/
package org.jfree.resourceloader.modules.cache.oscache;
import com.opensymphony.oscache.general.GeneralCacheAdministrator;
import com.opensymphony.oscache.base.NeedsRefreshException;
import org.jfree.resourceloader.ResourceData;
import org.jfree.resourceloader.ResourceKey;
import org.jfree.resourceloader.ResourceManager;
import org.jfree.resourceloader.ResourceLoadingException;
import org.jfree.resourceloader.cache.ResourceDataCache;
import org.jfree.resourceloader.cache.ResourceDataCacheEntry;
import org.jfree.resourceloader.cache.CachingResourceData;
import org.jfree.resourceloader.cache.DefaultResourceDataCacheEntry;
import org.jfree.resourceloader.cache.CacheUtility;
/**
* Creation-Date: 13.04.2006, 16:30:34
*
* @author Thomas Morgner
*/
public class OSResourceDataCache implements ResourceDataCache
{
private GeneralCacheAdministrator dataCache;
public OSResourceDataCache(final GeneralCacheAdministrator dataCache)
{
if (dataCache == null)
{
throw new NullPointerException();
}
this.dataCache = dataCache;
}
/**
* Retrieves the given data from the cache.
*
* @param data
*/
public ResourceDataCacheEntry get(final ResourceKey key)
{
final String ext = CacheUtility.externalizeKey(key);
if (ext == null)
{
return null;
}
try
{
return (ResourceDataCacheEntry) dataCache.getFromCache(ext);
}
catch (NeedsRefreshException e)
{
dataCache.cancelUpdate(ext);
dataCache.removeEntry(ext);
return null;
}
}
/**
* Stores the given data on the cache. The data is registered by its primary
* key. The cache has to store the current version of the data.
*
* @param data the data to be stored in the cache
* @return the resource data object, possibly wrapped by a cache-specific
* implementation.
*/
public ResourceData put(final ResourceManager caller, final ResourceData data)
throws ResourceLoadingException
{
final ResourceData cdata = CachingResourceData.createCached(data);
final String ext = CacheUtility.externalizeKey(data.getKey());
if (ext == null)
{
return cdata;
}
dataCache.putInCache(ext, new DefaultResourceDataCacheEntry(cdata, caller));
return cdata;
}
public void remove(final ResourceData data)
{
final String ext = CacheUtility.externalizeKey(data.getKey());
if (ext == null)
{
return;
}
dataCache.removeEntry(ext);
}
/**
* Remove all cached entries. This should be called after the cache has become
* invalid or after it has been removed from a resource manager.
*/
public void clear()
{
dataCache.flushAll();
}
}
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