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1   /**
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.hadoop.hbase.procedure;
19  
20  import java.io.IOException;
21  import java.util.Hashtable;
22  
23  import org.apache.hadoop.conf.Configuration;
24  import org.apache.hadoop.hbase.master.MasterServices;
25  import org.apache.hadoop.hbase.master.MetricsMaster;
26  import org.apache.zookeeper.KeeperException;
27  
28  /**
29   * Provides the globally barriered procedure framework and environment for
30   * master oriented operations. {@link org.apache.hadoop.hbase.master.HMaster} 
31   * interacts with the loaded procedure manager through this class.
32   */
33  public class MasterProcedureManagerHost extends
34      ProcedureManagerHost<MasterProcedureManager> {
35  
36    private Hashtable<String, MasterProcedureManager> procedureMgrMap
37        = new Hashtable<String, MasterProcedureManager>();
38  
39    @Override
40    public void loadProcedures(Configuration conf) {
41      loadUserProcedures(conf, MASTER_PROCEDURE_CONF_KEY);
42      for (MasterProcedureManager mpm : getProcedureManagers()) {
43        procedureMgrMap.put(mpm.getProcedureSignature(), mpm);
44      }
45    }
46  
47    public void initialize(MasterServices master, final MetricsMaster metricsMaster)
48        throws KeeperException, IOException, UnsupportedOperationException {
49      for (MasterProcedureManager mpm : getProcedureManagers()) {
50        mpm.initialize(master, metricsMaster);
51      }
52    }
53  
54    public void stop(String why) {
55      for (MasterProcedureManager mpm : getProcedureManagers()) {
56        mpm.stop(why);
57      }
58    }
59  
60    public MasterProcedureManager getProcedureManager(String signature) {
61      return procedureMgrMap.get(signature);
62    }
63  }