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// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gerrit.ehcache;
import com.google.gerrit.server.cache.Cache;
import net.sf.ehcache.CacheException;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.Element;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A fast in-memory and/or on-disk based cache.
*
* @type <K> type of key used to lookup entries in the cache.
* @type <V> type of value stored within each cache entry.
*/
final class SimpleCache<K, V> implements Cache<K, V> {
private static final Logger log = LoggerFactory.getLogger(SimpleCache.class);
private final Ehcache self;
SimpleCache(final Ehcache self) {
this.self = self;
}
Ehcache getEhcache() {
return self;
}
@SuppressWarnings("unchecked")
public V get(final K key) {
if (key == null) {
return null;
}
final Element m;
try {
m = self.get(key);
} catch (IllegalStateException err) {
log.error("Cannot lookup " + key + " in \"" + self.getName() + "\"", err);
return null;
} catch (CacheException err) {
log.error("Cannot lookup " + key + " in \"" + self.getName() + "\"", err);
return null;
}
return m != null ? (V) m.getObjectValue() : null;
}
public void put(final K key, final V value) {
self.put(new Element(key, value));
}
public void remove(final K key) {
if (key != null) {
self.remove(key);
}
}
public void removeAll() {
self.removeAll();
}
@Override
public String toString() {
return "Cache[" + self.getName() + "]";
}
}
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