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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  
20  package org.apache.hadoop.hbase.ipc;
21  
22  import java.util.HashMap;
23  
24  import org.apache.hadoop.hbase.classification.InterfaceAudience;
25  
26  @InterfaceAudience.Private
27  public class MetricsHBaseServerSourceFactoryImpl extends MetricsHBaseServerSourceFactory {
28    private static enum SourceStorage {
29      INSTANCE;
30      HashMap<String, MetricsHBaseServerSource>
31          sources =
32          new HashMap<String, MetricsHBaseServerSource>();
33  
34    }
35  
36    @Override
37    public MetricsHBaseServerSource create(String serverName, MetricsHBaseServerWrapper wrapper) {
38      return getSource(serverName, wrapper);
39    }
40  
41    private static synchronized MetricsHBaseServerSource getSource(String serverName,
42                                                                   MetricsHBaseServerWrapper wrapper) {
43      String context = createContextName(serverName);
44      MetricsHBaseServerSource source = SourceStorage.INSTANCE.sources.get(context);
45  
46      if (source == null) {
47        //Create the source.
48        source = new MetricsHBaseServerSourceImpl(
49            context,
50            METRICS_DESCRIPTION,
51            context.toLowerCase(),
52            context + METRICS_JMX_CONTEXT_SUFFIX, wrapper);
53  
54        //Store back in storage
55        SourceStorage.INSTANCE.sources.put(context, source);
56      }
57  
58      return source;
59  
60    }
61  
62  }