/**
* Copyright The Apache Software Foundation
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with this
* work for additional information regarding copyright ownership. The ASF
* 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.apache.hadoop.hbase.io.hfile;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
/**
* This class is used to manage the identifiers for
* {@link CacheableDeserializer}
*/
@InterfaceAudience.Private
public class CacheableDeserializerIdManager {
private static final Map<Integer, CacheableDeserializer<Cacheable>> registeredDeserializers =
new HashMap<Integer, CacheableDeserializer<Cacheable>>();
private static final AtomicInteger identifier = new AtomicInteger(0);
/**
* Register the given cacheable deserializer and generate an unique identifier
* id for it
* @param cd
* @return the identifier of given cacheable deserializer
*/
public static int registerDeserializer(CacheableDeserializer<Cacheable> cd) {
int idx = identifier.incrementAndGet();
synchronized (registeredDeserializers) {
registeredDeserializers.put(idx, cd);
}
return idx;
}
/**
* Get the cacheable deserializer as the given identifier Id
* @param id
* @return CacheableDeserializer
*/
public static CacheableDeserializer<Cacheable> getDeserializer(int id) {
return registeredDeserializers.get(id);
}
}