1 /*
2 * Copyright 2011 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.regionserver.wal;
21
22 import java.io.IOException;
23
24 import org.apache.hadoop.fs.Path;
25 import org.apache.hadoop.hbase.HRegionInfo;
26 import org.apache.hadoop.hbase.HTableDescriptor;
27
28 /**
29 * Get notification of {@link HLog}/WAL log events. The invocations are inline
30 * so make sure your implementation is fast else you'll slow hbase.
31 */
32 public interface WALActionsListener {
33 /**
34 * The WAL was rolled.
35 * @param newFile the path to the new hlog
36 */
37 public void logRolled(Path newFile) throws IOException;
38
39 /**
40 * A request was made that the WAL be rolled.
41 */
42 public void logRollRequested();
43
44 /**
45 * The WAL is about to close.
46 */
47 public void logCloseRequested();
48
49 /**
50 * Called before each write.
51 * @param info
52 * @param logKey
53 * @param logEdit
54 */
55 public void visitLogEntryBeforeWrite(HRegionInfo info, HLogKey logKey,
56 WALEdit logEdit);
57
58 /**
59 *
60 * @param htd
61 * @param logKey
62 * @param logEdit
63 */
64 public void visitLogEntryBeforeWrite(HTableDescriptor htd, HLogKey logKey,
65 WALEdit logEdit);
66
67 }