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1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  package org.apache.hadoop.hbase.master;
20  
21  import java.util.concurrent.Callable;
22  
23  import org.apache.hadoop.classification.InterfaceAudience;
24  import org.apache.hadoop.hbase.HRegionInfo;
25  
26  /**
27   * A callable object that invokes the corresponding action that needs to be
28   * taken for assignment of a region in transition. 
29   * Implementing as future callable we are able to act on the timeout
30   * asynchronously.
31   */
32  @InterfaceAudience.Private
33  public class AssignCallable implements Callable<Object> {
34    private AssignmentManager assignmentManager;
35  
36    private HRegionInfo hri;
37    private boolean newPlan;
38  
39    public AssignCallable(
40        AssignmentManager assignmentManager, HRegionInfo hri, boolean newPlan) {
41      this.assignmentManager = assignmentManager;
42      this.newPlan = newPlan;
43      this.hri = hri;
44    }
45  
46    @Override
47    public Object call() throws Exception {
48      assignmentManager.assign(hri, newPlan);
49      return null;
50    }
51  }