com.netflix.astyanax.mapping.MappingCache Maven / Gradle / Ivy
/*******************************************************************************
* Copyright 2011 Netflix
*
* Licensed 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 com.netflix.astyanax.mapping;
import com.google.common.collect.Maps;
import java.util.Map;
/**
* Utility to cache mappers. There's a small performance hit to reflect on a
* bean. This cache, re-uses mappers for a given bean
*/
public class MappingCache {
private final Map, Mapping> cache = Maps.newConcurrentMap();
/**
* Return a new or cached mapper
*
* @param clazz
* class for the mapper
* @return mapper
*/
public Mapping getMapping(Class clazz, boolean includeParentFields) {
return getMapping(clazz, new DefaultAnnotationSet(), includeParentFields);
}
public Mapping getMapping(Class clazz) {
return getMapping(clazz, false);
}
/**
* Return a new or cached mapper
*
* @param clazz
* class for the mapper
* @param annotationSet
* annotation set for the mapper
* @return mapper
*/
@SuppressWarnings({ "unchecked" })
public Mapping getMapping(Class clazz,
AnnotationSet annotationSet, boolean includeParentFields) {
Mapping mapping = (Mapping) cache.get(clazz); // cast is safe as
// this instance is
// the one adding to
// the map
if (mapping == null) {
// multiple threads can get here but that's OK
mapping = new Mapping(clazz, annotationSet, includeParentFields);
cache.put(clazz, mapping);
}
return mapping;
}
public Mapping getMapping(Class clazz, AnnotationSet annotationSet) {
return getMapping(clazz, annotationSet, false);
}
}