/*

  * Copyright 2005-2008 The Kuali Foundation

  * 

  * Licensed under the Educational Community License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  * 

  * http://www.opensource.org/licenses/ecl2.php

  * 

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.kuali.rice.kns.util.cache;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.kuali.rice.core.util.cache.CopiedObject;

 import com.opensymphony.oscache.base.CacheEntry;

 import com.opensymphony.oscache.base.events.CacheEntryEvent;

 /**

  * MethodCacheMonitor

  * 

  * 

  */

 @SuppressWarnings("unchecked")

 public class MethodResultsCacheMonitor extends OSCacheMonitor {

     private static final Log LOG = LogFactory.getLog(MethodResultsCacheMonitor.class);

     private int entryCount;

     private int byteSize;

     public MethodResultsCacheMonitor() {

         super("methodResultsCache");

         byteSize = 0;

         entryCount = 0;

     }

     /**

      * @see org.kuali.rice.kns.util.cache.OSCacheMonitor#cacheEntryAdded(com.opensymphony.oscache.base.events.CacheEntryEvent)

      */

         public void cacheEntryAdded(CacheEntryEvent event) {

         super.cacheEntryAdded(event);

         CacheEntry ce = event.getEntry();

         CopiedObject co = (CopiedObject) ce.getContent();

         if ( LOG.isDebugEnabled() ) {

                 LOG.debug("cached entry for key '" + ce.getKey() + "', size " + co.getSize() + " bytes");

         }

         entryCount++;

         byteSize += co.getSize();

         if ( LOG.isDebugEnabled() ) {

                 LOG.debug("cache size now " + entryCount + " entries, " + byteSize + " bytes");

         }

     }

     /**

      * @see org.kuali.rice.kns.util.cache.OSCacheMonitor#cacheEntryFlushed(com.opensymphony.oscache.base.events.CacheEntryEvent)

      */

     public void cacheEntryFlushed(CacheEntryEvent event) {

         super.cacheEntryFlushed(event);

         CacheEntry ce = event.getEntry();

         CopiedObject co = (CopiedObject) ce.getContent();

         if ( LOG.isDebugEnabled() ) {

                 LOG.debug("flushed entry for key '" + ce.getKey() + "', size " + co.getSize() + " bytes");

         }

         entryCount--;

         byteSize -= co.getSize();

         if ( LOG.isDebugEnabled() ) {

                 LOG.debug("cache size now " + entryCount + " entries, " + byteSize + " bytes");

         }

     }

     /**

      * @see org.kuali.rice.kns.util.cache.OSCacheMonitor#cacheEntryRemoved(com.opensymphony.oscache.base.events.CacheEntryEvent)

      */

     public void cacheEntryRemoved(CacheEntryEvent event) {

         super.cacheEntryRemoved(event);

         CacheEntry ce = event.getEntry();

         CopiedObject co = (CopiedObject) ce.getContent();

         if ( LOG.isDebugEnabled() ) {

                 LOG.debug("removed entry for key '" + ce.getKey() + "', size " + co.getSize() + " bytes");

         }

         entryCount--;

         byteSize -= co.getSize();

         if ( LOG.isDebugEnabled() ) {

                 LOG.debug("cache size now " + entryCount + " entries, " + byteSize + " bytes");

         }

     }

     /**

      * @see org.kuali.rice.kns.util.cache.OSCacheMonitor#cacheEntryUpdated(com.opensymphony.oscache.base.events.CacheEntryEvent)

      */

     public void cacheEntryUpdated(CacheEntryEvent event) {

         super.cacheEntryUpdated(event);

         CacheEntry ce = event.getEntry();

         CopiedObject co = (CopiedObject) ce.getContent();

         if ( LOG.isDebugEnabled() ) {

                 LOG.debug("updated entry for key '" + ce.getKey() + "', size " + co.getSize() + " bytes");

         }

         byteSize -= co.getOldSize();

         byteSize += co.getSize();

         if ( LOG.isDebugEnabled() ) {

                 LOG.debug("cache size now " + entryCount + " entries, " + byteSize + " bytes");

         }

     }

 }