View Javadoc

1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  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,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  package org.apache.hadoop.hbase.mob;
20  
21  import org.apache.hadoop.hbase.classification.InterfaceAudience;
22  import org.apache.hadoop.conf.Configuration;
23  import org.apache.hadoop.hbase.HColumnDescriptor;
24  import org.apache.hadoop.hbase.io.hfile.CacheConfig;
25  
26  /**
27   * The cache configuration for the mob.
28   */
29  @InterfaceAudience.Private
30  public class MobCacheConfig extends CacheConfig {
31  
32    private static MobFileCache mobFileCache;
33  
34    public MobCacheConfig(Configuration conf, HColumnDescriptor family) {
35      super(conf, family);
36      instantiateMobFileCache(conf);
37    }
38  
39    public MobCacheConfig(Configuration conf) {
40      super(conf);
41      instantiateMobFileCache(conf);
42    }
43  
44    /**
45     * Instantiates the MobFileCache.
46     * @param conf The current configuration.
47     * @return The current instance of MobFileCache.
48     */
49    public static synchronized MobFileCache instantiateMobFileCache(Configuration conf) {
50      if (mobFileCache == null) {
51        mobFileCache = new MobFileCache(conf);
52      }
53      return mobFileCache;
54    }
55  
56    /**
57     * Gets the MobFileCache.
58     * @return The MobFileCache.
59     */
60    public MobFileCache getMobFileCache() {
61      return mobFileCache;
62    }
63  }