01: /*
02:
03: Derby - Class org.apache.derby.iapi.store.raw.Compensation
04:
05: Licensed to the Apache Software Foundation (ASF) under one or more
06: contributor license agreements. See the NOTICE file distributed with
07: this work for additional information regarding copyright ownership.
08: The ASF licenses this file to you under the Apache License, Version 2.0
09: (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: }
|