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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  import java.util.Locale;
24
25  import org.apache.hadoop.hbase.classification.InterfaceAudience;
26
27  @InterfaceAudience.Private
28  public class MetricsHBaseServerSourceFactoryImpl extends MetricsHBaseServerSourceFactory {
29    private enum SourceStorage {
30      INSTANCE;
31      HashMap<String, MetricsHBaseServerSource>
32          sources =
33          new HashMap<String, MetricsHBaseServerSource>();
34
35    }
36
37    @Override
38    public MetricsHBaseServerSource create(String serverName, MetricsHBaseServerWrapper wrapper) {
39      return getSource(serverName, wrapper);
40    }
41
42    private static synchronized MetricsHBaseServerSource getSource(String serverName,
43                                                                   MetricsHBaseServerWrapper wrap) {
44      String context = createContextName(serverName);
45      MetricsHBaseServerSource source = SourceStorage.INSTANCE.sources.get(context);
46
47      if (source == null) {
48        //Create the source.
49        source = new MetricsHBaseServerSourceImpl(
50            context,
51            METRICS_DESCRIPTION,
52            context.toLowerCase(Locale.ROOT),
53            context + METRICS_JMX_CONTEXT_SUFFIX, wrap);
54
55        //Store back in storage
56        SourceStorage.INSTANCE.sources.put(context, source);
57      }
58
59      return source;
60
61    }
62
63  }