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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.snapshot;
19  
20  import java.util.concurrent.Callable;
21  
22  import org.apache.hadoop.classification.InterfaceAudience;
23  import org.apache.hadoop.hbase.errorhandling.ForeignException;
24  import org.apache.hadoop.hbase.errorhandling.ForeignExceptionSnare;
25  import org.apache.hadoop.hbase.errorhandling.ForeignExceptionDispatcher;
26  import org.apache.hadoop.hbase.protobuf.generated.HBaseProtos.SnapshotDescription;
27  
28  /**
29   * General snapshot operation taken on a regionserver
30   */
31  @InterfaceAudience.Private
32  public abstract class SnapshotTask implements ForeignExceptionSnare, Callable<Void>{
33  
34    protected final SnapshotDescription snapshot;
35    protected final ForeignExceptionDispatcher errorMonitor;
36  
37    /**
38     * @param snapshot Description of the snapshot we are going to operate on
39     * @param monitor listener interested in failures to the snapshot caused by this operation
40     */
41    public SnapshotTask(SnapshotDescription snapshot, ForeignExceptionDispatcher monitor) {
42      assert monitor != null : "ForeignExceptionDispatcher must not be null!";
43      assert snapshot != null : "SnapshotDescription must not be null!";
44      this.snapshot = snapshot;
45      this.errorMonitor = monitor;
46    }
47  
48    public void snapshotFailure(String message, Exception e) {
49      ForeignException ee = new ForeignException(message, e);
50      errorMonitor.receive(ee);
51    }
52  
53    @Override
54    public void rethrowException() throws ForeignException {
55      this.errorMonitor.rethrowException();
56    }
57  
58    @Override
59    public boolean hasException() {
60      return this.errorMonitor.hasException();
61    }
62  
63    @Override
64    public ForeignException getException() {
65      return this.errorMonitor.getException();
66    }
67  }