/**
    * 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.procedure;
  
  import java.io.IOException;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.procedure.flush.RegionServerFlushTableProcedureManager;
  import org.apache.hadoop.hbase.regionserver.RegionServerServices;
  import org.apache.hadoop.hbase.regionserver.snapshot.RegionServerSnapshotManager;
  import org.apache.zookeeper.KeeperException;
  
  /**
   * Provides the globally barriered procedure framework and environment
   * for region server oriented operations. 
   * {@link org.apache.hadoop.hbase.regionserver.HRegionServer} interacts
   * with the loaded procedure manager through this class.
   */
  public class RegionServerProcedureManagerHost extends
      ProcedureManagerHost<RegionServerProcedureManager> {
  
    private static final Log LOG = LogFactory
        .getLog(RegionServerProcedureManagerHost.class);
  
    public void initialize(RegionServerServices rss) throws KeeperException {
      for (RegionServerProcedureManager proc : procedures) {
        LOG.debug("Procedure " + proc.getProcedureSignature() + " is initializing");
        proc.initialize(rss);
        LOG.debug("Procedure " + proc.getProcedureSignature() + " is initialized");
      }
    }
  
    public void start() {
      for (RegionServerProcedureManager proc : procedures) {
        LOG.debug("Procedure " + proc.getProcedureSignature() + " is starting");
        proc.start();
        LOG.debug("Procedure " + proc.getProcedureSignature() + " is started");
      }
    }
  
    public void stop(boolean force) {
      for (RegionServerProcedureManager proc : procedures) {
        try {
          proc.stop(force);
        } catch (IOException e) {
          LOG.warn("Failed to close procedure " + proc.getProcedureSignature()
              + " cleanly", e);
        }
      }
    }
  
    @Override
    public void loadProcedures(Configuration conf) {
      loadUserProcedures(conf, REGIONSERVER_PROCEDURE_CONF_KEY);
      // load the default snapshot manager
      procedures.add(new RegionServerSnapshotManager());
      // load the default flush region procedure manager
      procedures.add(new RegionServerFlushTableProcedureManager());
    }
  
  }