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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.indices.analysis;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.Version;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
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
*/
public enum CachingStrategy {
ONE,
LUCENE,
ELASTICSEARCH
}
public interface PreBuiltCache {
T get(Version version);
void put(Version version, T t);
Collection values();
}
private PreBuiltCacheFactory() {}
public 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;
}
@Override
public Collection values() {
return model == null ? Collections.emptySet() : Collections.singleton(model);
}
}
/**
* This cache contains one version for each elasticsearch version object
*/
private static class PreBuiltCacheStrategyElasticsearch implements PreBuiltCache {
Map mapModel = new HashMap<>(2);
@Override
public T get(Version version) {
return mapModel.get(version);
}
@Override
public void put(Version version, T model) {
mapModel.put(version, model);
}
@Override
public Collection values() {
return mapModel.values();
}
}
/**
* This cache uses the lucene version for caching
*/
private static class PreBuiltCacheStrategyLucene implements PreBuiltCache {
private Map mapModel = new HashMap<>(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);
}
@Override
public Collection values() {
return mapModel.values();
}
}
}