/*
* Copyright 2015 Ben Manes. 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 com.github.benmanes.caffeine.jcache.event;
import static java.util.Objects.requireNonNull;
import javax.cache.Cache;
import com.github.benmanes.caffeine.cache.CacheWriter;
import com.github.benmanes.caffeine.cache.RemovalCause;
import com.github.benmanes.caffeine.jcache.Expirable;
import com.github.benmanes.caffeine.jcache.management.JCacheStatisticsMXBean;
/**
* A Caffeine {@link CacheWriter} that provides an adapter to publish events in the order of the
* actions being performed on a key.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
public final class JCacheEvictionListener<K, V> implements CacheWriter<K, Expirable<V>> {
private final JCacheStatisticsMXBean statistics;
private final EventDispatcher<K, V> dispatcher;
private Cache<K, V> cache;
public JCacheEvictionListener(EventDispatcher<K, V> dispatcher,
JCacheStatisticsMXBean statistics) {
this.dispatcher = requireNonNull(dispatcher);
this.statistics = requireNonNull(statistics);
}
/**
* Sets the cache instance that was created with this listener.
*
* @param cache the cache that uses this loader
*/
public void setCache(Cache<K, V> cache) {
this.cache = requireNonNull(cache);
}
@Override
public void write(K key, Expirable<V> value) {}
@Override
public void delete(K key, Expirable<V> value, RemovalCause cause) {
if (cause.wasEvicted()) {
if (cause == RemovalCause.EXPIRED) {
dispatcher.publishExpiredQuietly(cache, key, value.get());
} else {
dispatcher.publishRemovedQuietly(cache, key, value.get());
}
statistics.recordEvictions(1L);
}
}
}