View Javadoc

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