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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;
19  
20  import org.apache.hadoop.hbase.ServerName;
21  import org.apache.hadoop.hbase.master.HMaster;
22  import org.apache.hadoop.hbase.master.MetricsMasterWrapper;
23  import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
24  
25  /**
26   * Impl for exposing HMaster Information through JMX
27   */
28  public class MetricsMasterWrapperImpl implements MetricsMasterWrapper {
29  
30    private final HMaster master;
31  
32    public MetricsMasterWrapperImpl(final HMaster master) {
33      this.master = master;
34    }
35  
36    @Override
37    public double getAverageLoad() {
38      return master.getAverageLoad();
39    }
40  
41    @Override
42    public String getClusterId() {
43      return master.getClusterId();
44    }
45  
46    @Override
47    public String getZookeeperQuorum() {
48      ZooKeeperWatcher zk = master.getZooKeeperWatcher();
49      if (zk == null) {
50        return "";
51      }
52      return zk.getQuorum();
53    }
54  
55    @Override
56    public String[] getCoprocessors() {
57      return master.getCoprocessors();
58    }
59  
60    @Override
61    public long getStartTime() {
62      return master.getMasterStartTime();
63    }
64  
65    @Override
66    public long getActiveTime() {
67      return master.getMasterActiveTime();
68    }
69  
70    @Override
71    public int getRegionServers() {
72      ServerManager serverManager = this.master.getServerManager();
73      if (serverManager == null) {
74        return 0;
75      }
76      return serverManager.getOnlineServers().size();
77    }
78  
79    @Override
80    public int getDeadRegionServers() {
81      ServerManager serverManager = this.master.getServerManager();
82      if (serverManager == null) {
83        return 0;
84      }
85      return serverManager.getDeadServers().size();
86    }
87  
88    @Override
89    public String getServerName() {
90      ServerName serverName = master.getServerName();
91      if (serverName == null) {
92        return "";
93      }
94      return serverName.getServerName();
95    }
96  
97    @Override
98    public boolean getIsActiveMaster() {
99      return master.isActiveMaster();
100   }
101 }