hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/NoOpScanPolicyObserver.java

   1 /**
   2  * Licensed to the Apache Software Foundation (ASF) under one
   3  * or more contributor license agreements.  See the NOTICE file
   4  * distributed with this work for additional information
   5  * regarding copyright ownership.  The ASF licenses this file
   6  * to you under the Apache License, Version 2.0 (the
   7  * "License"); you may not use this file except in compliance
   8  * with the License.  You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18
  19 package org.apache.hadoop.hbase.regionserver;
  20
  21 import java.io.IOException;
  22 import java.util.Optional;
  23
  24 import org.apache.hadoop.hbase.client.TestFromClientSideWithCoprocessor;
  25 import org.apache.hadoop.hbase.coprocessor.ObserverContext;
  26 import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;
  27 import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
  28 import org.apache.hadoop.hbase.coprocessor.RegionObserver;
  29 import org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker;
  30 import org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest;
  31
  32 /**
  33  * RegionObserver that just reimplements the default behavior, in order to validate that all the
  34  * necessary APIs for this are public This observer is also used in
  35  * {@link TestFromClientSideWithCoprocessor} and {@link TestCompactionWithCoprocessor} to make sure
  36  * that a wide range of functionality still behaves as expected.
  37  */
  38 public class NoOpScanPolicyObserver implements RegionCoprocessor, RegionObserver {
  39
  40   @Override
  41   public Optional<RegionObserver> getRegionObserver() {
  42     return Optional.of(this);
  43   }
  44
  45   @Override
  46   public InternalScanner preFlush(ObserverContext<RegionCoprocessorEnvironment> c, Store store,
  47       InternalScanner scanner, FlushLifeCycleTracker tracker) throws IOException {
  48     return new DelegatingInternalScanner(scanner);
  49   }
  50
  51   @Override
  52   public InternalScanner preCompact(ObserverContext<RegionCoprocessorEnvironment> c, Store store,
  53       InternalScanner scanner, ScanType scanType, CompactionLifeCycleTracker tracker,
  54       CompactionRequest request) throws IOException {
  55     return new DelegatingInternalScanner(scanner);
  56   }
  57
  58   // TODO add for postScannerOpen
  59 }