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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
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*
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
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* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* language governing permissions and limitations under the License.
*
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* file and include the License file at packager/legal/LICENSE.txt.
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*
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package com.sun.ejb.containers.util.cache;
import com.sun.appserv.util.cache.Cache;
import com.sun.appserv.util.cache.CacheListener;
import com.sun.appserv.util.cache.Constants;
import com.sun.appserv.util.cache.LruCache;
import com.sun.logging.*;
import java.util.ArrayList;
import java.util.Map;
import java.util.Properties;
import java.util.ResourceBundle;
import java.util.logging.*;
import org.glassfish.ejb.LogFacade;
import org.glassfish.logging.annotation.LogMessageInfo;
/**
* LRUCache
* in-memory bounded cache with an LRU list
*/
public class LruEJBCache extends LruCache {
protected static final Logger _logger = LogFacade.getLogger();
@LogMessageInfo(
message = "[{0}]: trimLru(), resetting head and tail",
level = "WARNING")
private static final String TRIM_LRU_RESETTING_HEAD_AND_TAIL = "AS-EJB-00001";
protected String cacheName;
/**
* default constructor
*/
public LruEJBCache() { }
@Override
protected CacheItem trimLru(long currentTime) {
LruCacheItem trimItem = tail;
if (tail != head) {
tail = trimItem.getLPrev();
if (tail == null) {
_logger.log(Level.WARNING, TRIM_LRU_RESETTING_HEAD_AND_TAIL, cacheName);
// do not let the tail go past the head
tail = head = null;
} else {
tail.setLNext(null);
}
} else {
tail = head = null;
}
if (trimItem != null) {
trimItem.setTrimmed(true);
trimItem.setLPrev(null);
trimCount++;
listSize--;
}
return trimItem;
}
@Override
protected CacheItem itemAdded(CacheItem item) {
boolean wasUnbounded = isUnbounded;
CacheItem overflow = null;
// force not to check
isUnbounded = false;
try {
overflow = super.itemAdded(item);
} finally {
//restore
isUnbounded = wasUnbounded;
}
return overflow;
}
public void setCacheName(String name) {
this.cacheName = name;
}
}