| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hbase.regionserver; |
| |
| import java.io.IOException; |
| import java.util.function.IntConsumer; |
| import org.apache.commons.lang3.NotImplementedException; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.hbase.Cell; |
| import org.apache.hadoop.hbase.client.Scan; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * A "non-lazy" scanner which always does a real seek operation. Most scanners are inherited from |
| * this class. |
| */ |
| @InterfaceAudience.Private |
| public abstract class NonLazyKeyValueScanner implements KeyValueScanner { |
| |
| @Override |
| public boolean requestSeek(Cell kv, boolean forward, boolean useBloom) throws IOException { |
| return doRealSeek(this, kv, forward); |
| } |
| |
| @Override |
| public boolean realSeekDone() { |
| return true; |
| } |
| |
| @Override |
| public void enforceSeek() throws IOException { |
| throw new NotImplementedException("enforceSeek must not be called on a " + "non-lazy scanner"); |
| } |
| |
| public static boolean doRealSeek(KeyValueScanner scanner, Cell kv, boolean forward) |
| throws IOException { |
| return forward ? scanner.reseek(kv) : scanner.seek(kv); |
| } |
| |
| @Override |
| public boolean shouldUseScanner(Scan scan, HStore store, long oldestUnexpiredTS) { |
| // No optimizations implemented by default. |
| return true; |
| } |
| |
| @Override |
| public boolean isFileScanner() { |
| // Not a file by default. |
| return false; |
| } |
| |
| @Override |
| public void recordBlockSize(IntConsumer blockSizeConsumer) { |
| // do nothing |
| } |
| |
| @Override |
| public Path getFilePath() { |
| // Not a file by default. |
| return null; |
| } |
| |
| @Override |
| public Cell getNextIndexedKey() { |
| return null; |
| } |
| |
| @Override |
| public void shipped() throws IOException { |
| // do nothing |
| } |
| } |