/**
    *
    * 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.regionserver;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.CoordinatedStateManagerFactory;
  import org.apache.hadoop.hbase.HConstants;
  import org.apache.hadoop.hbase.LocalHBaseCluster;
  import org.apache.hadoop.hbase.CoordinatedStateManager;
  import org.apache.hadoop.hbase.util.ServerCommandLine;
  
  /**
   * Class responsible for parsing the command line and starting the
   * RegionServer.
   */
  @InterfaceAudience.Private
  public class HRegionServerCommandLine extends ServerCommandLine {
    private static final Log LOG = LogFactory.getLog(HRegionServerCommandLine.class);
  
    private final Class<? extends HRegionServer> regionServerClass;
  
    private static final String USAGE =
      "Usage: HRegionServer [-D conf.param=value] start";
  
    public HRegionServerCommandLine(Class<? extends HRegionServer> clazz) {
      this.regionServerClass = clazz;
    }
  
    protected String getUsage() {
      return USAGE;
    }
  
    private int start() throws Exception {
      Configuration conf = getConf();
      CoordinatedStateManager cp = CoordinatedStateManagerFactory.getCoordinatedStateManager(conf);
      try {
        // If 'local', don't start a region server here. Defer to
        // LocalHBaseCluster. It manages 'local' clusters.
        if (LocalHBaseCluster.isLocal(conf)) {
          LOG.warn("Not starting a distinct region server because "
              + HConstants.CLUSTER_DISTRIBUTED + " is false");
        } else {
          logProcessInfo(getConf());
          HRegionServer hrs = HRegionServer.constructRegionServer(regionServerClass, conf, cp);
          hrs.start();
          hrs.join();
          if (hrs.isAborted()) {
            throw new RuntimeException("HRegionServer Aborted");
          }
        }
      } catch (Throwable t) {
        LOG.error("Region server exiting", t);
        return 1;
      }
      return 0;
    }
  
    public int run(String args[]) throws Exception {
      if (args.length != 1) {
        usage(null);
        return 1;
      }
  
      String cmd = args[0];
  
      if ("start".equals(cmd)) {
        return start();
      } else if ("stop".equals(cmd)) {
        System.err.println(
          "To shutdown the regionserver run " +
          "bin/hbase-daemon.sh stop regionserver or send a kill signal to" +
          "the regionserver pid");
        return 1;
      } else {
        usage("Unknown command: " + args[0]);
        return 1;
      }
    }
  }