org.elasticsearch.index.cache.request.ShardRequestCache Maven / Gradle / Ivy
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Elasticsearch subproject :server
/*
* Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
* or more contributor license agreements. Licensed under the Elastic License
* 2.0 and the Server Side Public License, v 1; you may not use this file except
* in compliance with, at your election, the Elastic License 2.0 or the Server
* Side Public License, v 1.
*/
package org.elasticsearch.index.cache.request;
import org.apache.lucene.util.Accountable;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.metrics.CounterMetric;
/**
* Tracks the portion of the request cache in use for a particular shard.
*/
public final class ShardRequestCache {
final CounterMetric evictionsMetric = new CounterMetric();
final CounterMetric totalMetric = new CounterMetric();
final CounterMetric hitCount = new CounterMetric();
final CounterMetric missCount = new CounterMetric();
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(Accountable key, BytesReference value) {
totalMetric.inc(key.ramBytesUsed() + value.ramBytesUsed());
}
public void onRemoval(Accountable key, BytesReference value, boolean evicted) {
if (evicted) {
evictionsMetric.inc();
}
long dec = 0;
if (key != null) {
dec += key.ramBytesUsed();
}
if (value != null) {
dec += value.ramBytesUsed();
}
totalMetric.dec(dec);
}
}