001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.regionserver;
019
020import java.io.IOException;
021import java.util.Optional;
022import org.apache.hadoop.hbase.coprocessor.ObserverContext;
023import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;
024import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
025import org.apache.hadoop.hbase.coprocessor.RegionObserver;
026import org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker;
027import org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest;
028
029/**
030 * RegionObserver that just reimplements the default behavior, in order to validate that all the
031 * necessary APIs for this are public This observer is also used in
032 * {@code TestFromClientSideWithCoprocessor} and {@link TestCompactionWithCoprocessor} to make sure
033 * that a wide range of functionality still behaves as expected.
034 */
035public class NoOpScanPolicyObserver implements RegionCoprocessor, RegionObserver {
036
037  @Override
038  public Optional<RegionObserver> getRegionObserver() {
039    return Optional.of(this);
040  }
041
042  @Override
043  public InternalScanner preFlush(ObserverContext<? extends RegionCoprocessorEnvironment> c,
044    Store store, InternalScanner scanner, FlushLifeCycleTracker tracker) throws IOException {
045    return new DelegatingInternalScanner(scanner);
046  }
047
048  @Override
049  public InternalScanner preCompact(ObserverContext<? extends RegionCoprocessorEnvironment> c,
050    Store store, InternalScanner scanner, ScanType scanType, CompactionLifeCycleTracker tracker,
051    CompactionRequest request) throws IOException {
052    return new DelegatingInternalScanner(scanner);
053  }
054
055  // TODO add for postScannerOpen
056}