HBASE-26286: Add support for specifying store file tracker when restoring or cloning...
[hbase.git] / hbase-server / src / main / java / org / apache / hadoop / hbase / regionserver / NonLazyKeyValueScanner.java
blobfe2ce6fa4b941a6cdf0052a6827dee1d24b2a264
1 /*
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
11 * http://www.apache.org/licenses/LICENSE-2.0
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.
19 package org.apache.hadoop.hbase.regionserver;
21 import java.io.IOException;
23 import org.apache.commons.lang3.NotImplementedException;
24 import org.apache.yetus.audience.InterfaceAudience;
25 import org.apache.hadoop.fs.Path;
26 import org.apache.hadoop.hbase.Cell;
27 import org.apache.hadoop.hbase.client.Scan;
29 /**
30 * A "non-lazy" scanner which always does a real seek operation. Most scanners
31 * are inherited from this class.
33 @InterfaceAudience.Private
34 public abstract class NonLazyKeyValueScanner implements KeyValueScanner {
36 @Override
37 public boolean requestSeek(Cell kv, boolean forward, boolean useBloom)
38 throws IOException {
39 return doRealSeek(this, kv, forward);
42 @Override
43 public boolean realSeekDone() {
44 return true;
47 @Override
48 public void enforceSeek() throws IOException {
49 throw new NotImplementedException("enforceSeek must not be called on a " +
50 "non-lazy scanner");
53 public static boolean doRealSeek(KeyValueScanner scanner,
54 Cell kv, boolean forward) throws IOException {
55 return forward ? scanner.reseek(kv) : scanner.seek(kv);
58 @Override
59 public boolean shouldUseScanner(Scan scan, HStore store, long oldestUnexpiredTS) {
60 // No optimizations implemented by default.
61 return true;
64 @Override
65 public boolean isFileScanner() {
66 // Not a file by default.
67 return false;
71 @Override
72 public Path getFilePath() {
73 // Not a file by default.
74 return null;
77 @Override
78 public Cell getNextIndexedKey() {
79 return null;
82 @Override
83 public void shipped() throws IOException {
84 // do nothing