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Server functionality for HBase

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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.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.regionserver.HRegionServer;
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 HRegionServer} interacts
 * with the loaded procedure manager through this class.
 */
public class RegionServerProcedureManagerHost extends
    ProcedureManagerHost {

  private static final Log LOG = LogFactory
      .getLog(RegionServerProcedureManagerHost.class);

  public void initialize(RegionServerServices rss) throws KeeperException {
    for (RegionServerProcedureManager proc : procedures) {
      LOG.info("Procedure " + proc.getProcedureSignature() + " is initializing");
      proc.initialize(rss);
      LOG.info("Procedure " + proc.getProcedureSignature() + " is initialized");
    }
  }

  public void start() {
    for (RegionServerProcedureManager proc : procedures) {
      LOG.info("Procedure " + proc.getProcedureSignature() + " is starting");
      proc.start();
      LOG.info("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());
  }

}