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 */
018
019package org.apache.hadoop.hbase.regionserver;
020
021import java.io.IOException;
022import java.util.Optional;
023
024import org.apache.hadoop.hbase.client.TestFromClientSideWithCoprocessor;
025import org.apache.hadoop.hbase.coprocessor.ObserverContext;
026import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;
027import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
028import org.apache.hadoop.hbase.coprocessor.RegionObserver;
029import org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker;
030import org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest;
031
032/**
033 * RegionObserver that just reimplements the default behavior, in order to validate that all the
034 * necessary APIs for this are public This observer is also used in
035 * {@link TestFromClientSideWithCoprocessor} and {@link TestCompactionWithCoprocessor} to make sure
036 * that a wide range of functionality still behaves as expected.
037 */
038public class NoOpScanPolicyObserver implements RegionCoprocessor, RegionObserver {
039
040  @Override
041  public Optional<RegionObserver> getRegionObserver() {
042    return Optional.of(this);
043  }
044
045  @Override
046  public InternalScanner preFlush(ObserverContext<RegionCoprocessorEnvironment> c, Store store,
047      InternalScanner scanner, FlushLifeCycleTracker tracker) throws IOException {
048    return new DelegatingInternalScanner(scanner);
049  }
050
051  @Override
052  public InternalScanner preCompact(ObserverContext<RegionCoprocessorEnvironment> c, Store store,
053      InternalScanner scanner, ScanType scanType, CompactionLifeCycleTracker tracker,
054      CompactionRequest request) throws IOException {
055    return new DelegatingInternalScanner(scanner);
056  }
057
058  // TODO add for postScannerOpen
059}