001/**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase.mob;
020
021import org.apache.hadoop.conf.Configuration;
022import org.apache.hadoop.hbase.HColumnDescriptor;
023import org.apache.yetus.audience.InterfaceAudience;
024import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
025import org.apache.hadoop.hbase.io.hfile.CacheConfig;
026
027/**
028 * The cache configuration for the mob.
029 */
030@InterfaceAudience.Private
031public class MobCacheConfig extends CacheConfig {
032
033  private static MobFileCache mobFileCache;
034
035  public MobCacheConfig(Configuration conf, ColumnFamilyDescriptor family) {
036    super(conf, family);
037    instantiateMobFileCache(conf);
038  }
039
040  public MobCacheConfig(Configuration conf) {
041    super(conf);
042    instantiateMobFileCache(conf);
043  }
044
045  /**
046   * Instantiates the MobFileCache.
047   * @param conf The current configuration.
048   * @return The current instance of MobFileCache.
049   */
050  public static synchronized MobFileCache instantiateMobFileCache(Configuration conf) {
051    if (mobFileCache == null) {
052      mobFileCache = new MobFileCache(conf);
053    }
054    return mobFileCache;
055  }
056
057  /**
058   * Gets the MobFileCache.
059   * @return The MobFileCache.
060   */
061  public MobFileCache getMobFileCache() {
062    return mobFileCache;
063  }
064}