1 /**
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19
20 package org.apache.hadoop.hbase.regionserver;
21
22 import java.io.IOException;
23 import java.util.List;
24
25 import org.apache.hadoop.hbase.classification.InterfaceAudience;
26
27
28 /**
29 * If set of MapFile.Readers in Store change, implementors are notified.
30 */
31 @InterfaceAudience.Private
32 public interface ChangedReadersObserver {
33
34 /**
35 * @return the read point of the current scan
36 */
37 long getReadPoint();
38 /**
39 * Notify observers.
40 * @param sfs The new files
41 * @param memStoreScanners scanner of current memstore
42 * @throws IOException e
43 */
44 void updateReaders(List<StoreFile> sfs, List<KeyValueScanner> memStoreScanners) throws IOException;
45 }