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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  package org.apache.hadoop.hbase.master.metrics;
19  
20  import javax.management.ObjectName;
21  
22  import org.apache.hadoop.hbase.metrics.MetricsMBeanBase;
23  import org.apache.hadoop.metrics.util.MBeanUtil;
24  import org.apache.hadoop.metrics.util.MetricsRegistry;
25  
26  /**
27   * Exports the {@link MasterMetrics} statistics as an MBean
28   * for JMX.
29   */
30  public class MasterStatistics extends MetricsMBeanBase {
31    private final ObjectName mbeanName;
32  
33    public MasterStatistics(MetricsRegistry registry) {
34      super(registry, "MasterStatistics");
35      mbeanName = MBeanUtil.registerMBean("Master", "MasterStatistics", this);
36    }
37  
38    public void shutdown() {
39      if (mbeanName != null)
40        MBeanUtil.unregisterMBean(mbeanName);
41    }
42  }