/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.field.data.weak;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.collect.MapEvictionListener;
import org.elasticsearch.common.collect.MapMaker;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.cache.field.data.support.AbstractConcurrentMapFieldDataCache;
import org.elasticsearch.index.field.data.FieldData;
import org.elasticsearch.index.settings.IndexSettings;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicLong;
/**
* @author kimchy (shay.banon)
*/
public class WeakFieldDataCache extends AbstractConcurrentMapFieldDataCache implements MapEvictionListener<String, FieldData> {
private final AtomicLong evictions = new AtomicLong();
@Inject public WeakFieldDataCache(Index index, @IndexSettings Settings indexSettings) {
super(index, indexSettings);
}
@Override protected ConcurrentMap<String, FieldData> buildFieldDataMap() {
return new MapMaker().weakValues().evictionListener(this).makeMap();
}
@Override public String type() {
return "weak";
}
@Override public long evictions() {
return evictions.get();
}
@Override public void onEviction(@Nullable String s, @Nullable FieldData fieldData) {
evictions.incrementAndGet();
}
}