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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.hbase.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      private MetricsTableAggregateSourceImpl tblAggImpl;
33    }
34  
35    private synchronized MetricsRegionAggregateSourceImpl getAggregate() {
36      synchronized (FactoryStorage.INSTANCE.aggLock) {
37        if (FactoryStorage.INSTANCE.aggImpl == null) {
38          FactoryStorage.INSTANCE.aggImpl = new MetricsRegionAggregateSourceImpl();
39        }
40        return FactoryStorage.INSTANCE.aggImpl;
41      }
42    }
43  
44    @Override
45    public synchronized MetricsTableAggregateSourceImpl getTableAggregate() {
46      synchronized (FactoryStorage.INSTANCE.aggLock) {
47        if (FactoryStorage.INSTANCE.tblAggImpl == null) {
48          FactoryStorage.INSTANCE.tblAggImpl = new MetricsTableAggregateSourceImpl();
49        }
50        return FactoryStorage.INSTANCE.tblAggImpl;
51      }
52    }
53  
54    @Override
55    public synchronized MetricsRegionServerSource createServer(MetricsRegionServerWrapper regionServerWrapper) {
56      return new MetricsRegionServerSourceImpl(regionServerWrapper);
57    }
58  
59    @Override
60    public MetricsRegionSource createRegion(MetricsRegionWrapper wrapper) {
61      return new MetricsRegionSourceImpl(wrapper, getAggregate());
62    }
63  
64    @Override
65    public MetricsTableSource createTable(String table, MetricsTableWrapperAggregate wrapper) {
66      return new MetricsTableSourceImpl(table, getTableAggregate(), wrapper);
67    }
68  }