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Java > Open Source Codes > org > apache > derby > iapi > store > raw > Compensation


1 /*
2
3    Derby - Class org.apache.derby.iapi.store.raw.Compensation
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    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  */
21
22 package org.apache.derby.iapi.store.raw;
23
24 /**
25     A Compensation operation can compensate for the action of a log operation.
26     A Compensation operation itself is not undo-able, i.e., it is loggable but
27     not undoable.
28
29     A Compensation operation is generated by the logging system when it calls
30     undoable.generateUndo(). GenerateUndo should be the <B>only</B> way a
31     compensation operation can be made.
32
33     @see Undoable#generateUndo
34 */
35 public interface Compensation extends Loggable {
36
37     /**
38       Set up the undoable operation during recovery redo.
39
40       @param op the Undoable operation
41       @see Loggable#needsRedo
42     */
43     public void setUndoOp(Undoable op);
44 }
45
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