1 /**
2 * Copyright The Apache Software Foundation
3 *
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with this
6 * work for additional information regarding copyright ownership. The ASF
7 * licenses this file to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
16 * License for the specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.hadoop.hbase.io.hfile;
20
21 import java.util.HashMap;
22 import java.util.Map;
23 import java.util.concurrent.atomic.AtomicInteger;
24
25 import org.apache.hadoop.hbase.classification.InterfaceAudience;
26
27 /**
28 * This class is used to manage the identifiers for
29 * {@link CacheableDeserializer}
30 */
31 @InterfaceAudience.Private
32 public class CacheableDeserializerIdManager {
33 private static final Map<Integer, CacheableDeserializer<Cacheable>> registeredDeserializers =
34 new HashMap<Integer, CacheableDeserializer<Cacheable>>();
35 private static final AtomicInteger identifier = new AtomicInteger(0);
36
37 /**
38 * Register the given cacheable deserializer and generate an unique identifier
39 * id for it
40 * @param cd
41 * @return the identifier of given cacheable deserializer
42 */
43 public static int registerDeserializer(CacheableDeserializer<Cacheable> cd) {
44 int idx = identifier.incrementAndGet();
45 synchronized (registeredDeserializers) {
46 registeredDeserializers.put(idx, cd);
47 }
48 return idx;
49 }
50
51 /**
52 * Get the cacheable deserializer as the given identifier Id
53 * @param id
54 * @return CacheableDeserializer
55 */
56 public static CacheableDeserializer<Cacheable> getDeserializer(int id) {
57 return registeredDeserializers.get(id);
58 }
59 }