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1   /*
2    * Copyright 2010 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  package org.apache.hadoop.hbase.util;
21  
22  /**
23   * Similar interface as {@link org.apache.hadoop.util.Progressable} but returns
24   * a boolean to support canceling the operation.
25   * <p>
26   * Used for doing updating of OPENING znode during log replay on region open.
27   */
28  public interface CancelableProgressable {
29  
30    /**
31     * Report progress.  Returns true if operations should continue, false if the
32     * operation should be canceled and rolled back.
33     * @return whether to continue (true) or cancel (false) the operation
34     */
35    public boolean progress();
36  
37  }