/**
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.hadoop.hbase.master;
  
  import org.apache.commons.lang.StringUtils;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.ServerName;
  import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
  
  /**
   * Impl for exposing HMaster Information through JMX
   */
  @InterfaceAudience.Private
  public class MetricsMasterWrapperImpl implements MetricsMasterWrapper {
  
    private final HMaster master;
  
    public MetricsMasterWrapperImpl(final HMaster master) {
      this.master = master;
    }
  
    @Override
    public double getAverageLoad() {
      return master.getAverageLoad();
    }
  
    @Override
    public String getClusterId() {
      return master.getClusterId();
    }
  
    @Override
    public String getZookeeperQuorum() {
      ZooKeeperWatcher zk = master.getZooKeeper();
      if (zk == null) {
        return "";
      }
      return zk.getQuorum();
    }
  
    @Override
    public String[] getCoprocessors() {
      return master.getMasterCoprocessors();
    }
  
    @Override
    public long getStartTime() {
      return master.getMasterStartTime();
    }
  
    @Override
    public long getActiveTime() {
      return master.getMasterActiveTime();
    }
  
    @Override
    public String getRegionServers() {
      ServerManager serverManager = this.master.getServerManager();
      if (serverManager == null) {
        return "";
      }
      return StringUtils.join(serverManager.getOnlineServers().keySet(), ";");
    }
    
    @Override
    public int getNumRegionServers() {
      ServerManager serverManager = this.master.getServerManager();
      if (serverManager == null) {
        return 0;
      }
      return serverManager.getOnlineServers().size();
    }
  
    @Override
    public String getDeadRegionServers() {
      ServerManager serverManager = this.master.getServerManager();
      if (serverManager == null) {
        return "";
      }
      return StringUtils.join(serverManager.getDeadServers().copyServerNames(), ";");
    }
  
    
    @Override
   public int getNumDeadRegionServers() {
     ServerManager serverManager = this.master.getServerManager();
     if (serverManager == null) {
       return 0;
     }
     return serverManager.getDeadServers().size();
   }
 
   @Override
   public String getServerName() {
     ServerName serverName = master.getServerName();
     if (serverName == null) {
       return "";
     }
     return serverName.getServerName();
   }
 
   @Override
   public boolean getIsActiveMaster() {
     return master.isActiveMaster();
   }
 }