/*
* Copyright (C) 1999-2009 Jive Software. All rights reserved.
*
* Licensed under the Apache 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.apache.org/licenses/LICENSE-2.0
*
* 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.jivesoftware.openfire.plugin.util.cache;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import org.jivesoftware.util.cache.Cache;
import org.jivesoftware.util.cache.CacheFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.hazelcast.core.EntryListener;
import com.hazelcast.core.IMap;
import com.hazelcast.monitor.LocalMapStats;
/**
* Clustered implementation of the Cache interface using Hazelcast.
*
*/
public class ClusteredCache implements Cache {
private static Logger logger = LoggerFactory.getLogger(ClusteredCache.class);
private final Map<EntryListener, String> registrations = new HashMap<EntryListener, String>();
/**
* The map is used for distributed operations such as get, put, etc.
*/
protected IMap map;
private String name;
private long numberOfGets = 0;
/**
* Create a new cache using the supplied named cache as the actual cache implementation
*
* @param name a name for the cache, which should be unique per vm.
* @param cache the cache implementation
*/
protected ClusteredCache(String name, IMap cache) {
map = cache;
setName(name);
}
public void addEntryListener(EntryListener listener, boolean includeValue) {
registrations.put(listener, map.addEntryListener(listener, includeValue));
}
public void removeEntryListener(EntryListener listener) {
String registrationId = registrations.get(listener);
if (registrationId != null) {
map.removeEntryListener(registrationId);
}
}
// Cache Interface
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Object put(Object key, Object object) {
if (object == null) { return null; }
return map.put(key, object);
}
public Object get(Object key) {
numberOfGets++;
return map.get(key);
}
public Object remove(Object key) {
return map.remove(key);
}
public void clear() {
map.clear();
}
public int size() {
LocalMapStats stats = map.getLocalMapStats();
return (int) (stats.getOwnedEntryCount() + stats.getBackupEntryCount());
}
public boolean containsKey(Object key) {
return map.containsKey(key);
}
public boolean containsValue(Object value) {
return map.containsValue(value);
}
public Set entrySet() {
return map.entrySet();
}
public boolean isEmpty() {
return map.isEmpty();
}
public Set keySet() {
return map.keySet();
}
public void putAll(Map entries) {
map.putAll(entries);
}
public Collection values() {
return map.values();
}
public long getCacheHits() {
return map.getLocalMapStats().getHits();
}
public long getCacheMisses() {
long hits = map.getLocalMapStats().getHits();
return numberOfGets > hits ? numberOfGets - hits : 0;
}
public int getCacheSize() {
LocalMapStats stats = map.getLocalMapStats();
return (int) (stats.getOwnedEntryMemoryCost() + stats.getBackupEntryMemoryCost());
}
public long getMaxCacheSize() {
return CacheFactory.getMaxCacheSize(getName());
}
public void setMaxCacheSize(int maxSize) {
CacheFactory.setMaxSizeProperty(getName(), maxSize);
}
public long getMaxLifetime() {
return CacheFactory.getMaxCacheLifetime(getName());
}
public void setMaxLifetime(long maxLifetime) {
CacheFactory.setMaxLifetimeProperty(getName(), maxLifetime);
}
public void destroy() {
map.destroy();
}
public boolean lock(Object key, long timeout) {
boolean result = true;
if (timeout < 0) {
map.lock(key);
} else if (timeout == 0) {
result = map.tryLock(key);
} else {
try {
result = map.tryLock(key, timeout, TimeUnit.MILLISECONDS);
} catch (InterruptedException e) {
logger.error("Failed to get cluster lock", e);
result = false;
}
}
return result;
}
public boolean unlock(Object key) {
boolean result = true;
try { map.unlock(key); }
catch (IllegalMonitorStateException e) {
logger.error("Falied to release cluster lock", e);
result = false;
}
return result;
}
}