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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.indices.analysis;
import com.google.common.collect.Maps;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.Version;
import java.util.Map;
/**
*
*/
public class PreBuiltCacheFactory {
/**
* The strategy of caching the analyzer
*
* ONE Exactly one version is stored. Useful for analyzers which do not store version information
* LUCENE Exactly one version for each lucene version is stored. Useful to prevent different analyzers with the same version
* ELASTICSEARCH Exactly one version per elasticsearch version is stored. Useful if you change an analyzer between elasticsearch releases, when the lucene version does not change
*/
static enum CachingStrategy { ONE, LUCENE, ELASTICSEARCH };
public interface PreBuiltCache {
T get(Version version);
void put(Version version, T t);
}
private PreBuiltCacheFactory() {}
static PreBuiltCache getCache(CachingStrategy cachingStrategy) {
switch (cachingStrategy) {
case ONE:
return new PreBuiltCacheStrategyOne<>();
case LUCENE:
return new PreBuiltCacheStrategyLucene<>();
case ELASTICSEARCH:
return new PreBuiltCacheStrategyElasticsearch<>();
default:
throw new ElasticsearchException("No action configured for caching strategy[" + cachingStrategy + "]");
}
}
/**
* This is a pretty simple cache, it only contains one version
*/
private static class PreBuiltCacheStrategyOne implements PreBuiltCache {
private T model = null;
@Override
public T get(Version version) {
return model;
}
@Override
public void put(Version version, T model) {
this.model = model;
}
}
/**
* This cache contains one version for each elasticsearch version object
*/
private static class PreBuiltCacheStrategyElasticsearch implements PreBuiltCache {
Map mapModel = Maps.newHashMapWithExpectedSize(2);
@Override
public T get(Version version) {
return mapModel.get(version);
}
@Override
public void put(Version version, T model) {
mapModel.put(version, model);
}
}
/**
* This cache uses the lucene version for caching
*/
private static class PreBuiltCacheStrategyLucene implements PreBuiltCache {
private Map mapModel = Maps.newHashMapWithExpectedSize(2);
@Override
public T get(Version version) {
return mapModel.get(version.luceneVersion);
}
@Override
public void put(org.elasticsearch.Version version, T model) {
mapModel.put(version.luceneVersion, model);
}
}
}