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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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.elasticsearch.index.cache.request;
import com.google.common.cache.RemovalListener;
import com.google.common.cache.RemovalNotification;
import org.elasticsearch.common.metrics.CounterMetric;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.shard.AbstractIndexShardComponent;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.indices.cache.request.IndicesRequestCache;
public class ShardRequestCache extends AbstractIndexShardComponent implements RemovalListener {
final CounterMetric evictionsMetric = new CounterMetric();
final CounterMetric totalMetric = new CounterMetric();
final CounterMetric hitCount = new CounterMetric();
final CounterMetric missCount = new CounterMetric();
public ShardRequestCache(ShardId shardId, Settings indexSettings) {
super(shardId, indexSettings);
}
public RequestCacheStats stats() {
return new RequestCacheStats(totalMetric.count(), evictionsMetric.count(), hitCount.count(), missCount.count());
}
public void onHit() {
hitCount.inc();
}
public void onMiss() {
missCount.inc();
}
public void onCached(IndicesRequestCache.Key key, IndicesRequestCache.Value value) {
totalMetric.inc(key.ramBytesUsed() + value.ramBytesUsed());
}
@Override
public void onRemoval(RemovalNotification removalNotification) {
if (removalNotification.wasEvicted()) {
evictionsMetric.inc();
}
long dec = 0;
if (removalNotification.getKey() != null) {
dec += removalNotification.getKey().ramBytesUsed();
}
if (removalNotification.getValue() != null) {
dec += removalNotification.getValue().ramBytesUsed();
}
totalMetric.dec(dec);
}
}