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Interfaces to be implemented in order to smooth over hadoop version differences
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/*
 * 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 java.util.Map;
import java.util.Map.Entry;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * This is the interface that will expose information to hadoop1/hadoop2 implementations of the
 * MetricsMasterSource.
 */
@InterfaceAudience.Private
public interface MetricsMasterWrapper {

  /**
   * Returns if the master is currently running and is not attempting to shutdown.
   */
  boolean isRunning();

  /**
   * Get ServerName
   */
  String getServerName();

  /**
   * Get Average Load
   * @return Average Load
   */
  double getAverageLoad();

  /**
   * Get the Cluster ID
   * @return Cluster ID
   */
  String getClusterId();

  /**
   * Get the ZooKeeper Quorum Info
   * @return ZooKeeper Quorum Info
   */
  String getZookeeperQuorum();

  /**
   * Get the co-processors
   * @return Co-processors
   */
  String[] getCoprocessors();

  /**
   * Get hbase master start time
   * @return Start time of master in milliseconds
   */
  long getStartTime();

  /**
   * Get the hbase master active time
   * @return Time in milliseconds when master became active
   */
  long getActiveTime();

  /**
   * Whether this master is the active master
   * @return True if this is the active master
   */
  boolean getIsActiveMaster();

  /**
   * Get the live region servers
   * @return Live region servers
   */
  String getRegionServers();

  /**
   * Get the number of live region servers
   * @return number of Live region servers
   */

  int getNumRegionServers();

  /**
   * Get the dead region servers
   * @return Dead region Servers
   */
  String getDeadRegionServers();

  /**
   * Get the number of dead region servers
   * @return number of Dead region Servers
   */
  int getNumDeadRegionServers();

  /**
   * Get the draining region servers
   * @return Draining region server
   */
  String getDrainingRegionServers();

  /**
   * Get the number of draining region servers
   * @return number of draining region servers
   */
  int getNumDrainingRegionServers();

  /**
   * Get the number of master WAL files.
   */
  long getNumWALFiles();

  /**
   * Get the number of region split plans executed.
   */
  long getSplitPlanCount();

  /**
   * Get the number of region merge plans executed.
   */
  long getMergePlanCount();

  /**
   * Gets the space usage and limit for each table.
   */
  Map> getTableSpaceUtilization();

  /**
   * Gets the space usage and limit for each namespace.
   */
  Map> getNamespaceSpaceUtilization();

  /**
   * Get the time in Millis when the master finished initializing/becoming the active master
   */
  long getMasterInitializationTime();

  /**
   * Get the size of old WALs directory in bytes.
   */
  long getOldWALsDirSize();
}