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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.hadoop.hbase.regionserver;
20  
21  import org.apache.hadoop.classification.InterfaceAudience;
22  
23  /**
24   * Factory to create MetricsRegionServerSource when given a  MetricsRegionServerWrapper
25   */
26  @InterfaceAudience.Private
27  public class MetricsRegionServerSourceFactoryImpl implements MetricsRegionServerSourceFactory {
28    public static enum FactoryStorage {
29      INSTANCE;
30      private Object aggLock = new Object();
31      private MetricsRegionAggregateSourceImpl aggImpl;
32    }
33  
34    private synchronized MetricsRegionAggregateSourceImpl getAggregate() {
35      synchronized (FactoryStorage.INSTANCE.aggLock) {
36        if (FactoryStorage.INSTANCE.aggImpl == null) {
37          FactoryStorage.INSTANCE.aggImpl = new MetricsRegionAggregateSourceImpl();
38        }
39        return FactoryStorage.INSTANCE.aggImpl;
40      }
41    }
42  
43  
44    @Override
45    public synchronized MetricsRegionServerSource createServer(MetricsRegionServerWrapper regionServerWrapper) {
46      return new MetricsRegionServerSourceImpl(regionServerWrapper);
47    }
48  
49    @Override
50    public MetricsRegionSource createRegion(MetricsRegionWrapper wrapper) {
51      return new MetricsRegionSourceImpl(wrapper, getAggregate());
52    }
53  }