/*
* 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.cache.simulator.policy.product;
import java.util.Set;
import com.github.benmanes.caffeine.cache.simulator.BasicSettings;
import com.github.benmanes.caffeine.cache.simulator.policy.Policy;
import com.github.benmanes.caffeine.cache.simulator.policy.PolicyStats;
import com.google.common.collect.ImmutableSet;
import com.typesafe.config.Config;
import net.sf.ehcache.Cache;
import net.sf.ehcache.CacheManager;
import net.sf.ehcache.Ehcache;
import net.sf.ehcache.Element;
import net.sf.ehcache.config.CacheConfiguration;
import net.sf.ehcache.store.MemoryStoreEvictionPolicy;
/**
* Ehcache 2 implementation.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
public final class Ehcache2Policy implements Policy {
private static final CacheManager cacheManager = new CacheManager();
private final PolicyStats policyStats;
private final int maximumSize;
private final Ehcache cache;
public Ehcache2Policy(Config config) {
Ehcache2Settings settings = new Ehcache2Settings(config);
maximumSize = settings.maximumSize();
policyStats = new PolicyStats("product.Ehcache2");
CacheConfiguration configuration = new CacheConfiguration("ehcache2", maximumSize);
configuration.setMemoryStoreEvictionPolicyFromObject(settings.policy());
cache = new Cache(configuration);
cacheManager.addCache(cache);
}
/** Returns all variations of this policy based on the configuration parameters. */
public static Set<Policy> policies(Config config) {
return ImmutableSet.of(new Ehcache2Policy(config));
}
@Override
public void record(long key) {
Object value = cache.get(key);
if (value == null) {
policyStats.recordMiss();
if (cache.getSize() == maximumSize) {
policyStats.recordEviction();
}
cache.put(new Element(key, key));
} else {
policyStats.recordHit();
}
}
@Override
public PolicyStats stats() {
return policyStats;
}
static final class Ehcache2Settings extends BasicSettings {
public Ehcache2Settings(Config config) {
super(config);
}
public MemoryStoreEvictionPolicy policy() {
return MemoryStoreEvictionPolicy.fromString(config().getString("ehcache2.policy"));
}
}
}