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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  package org.apache.hadoop.hbase.regionserver;
19  
20  import org.apache.hadoop.classification.InterfaceAudience;
21  import org.apache.hadoop.conf.Configuration;
22  import org.apache.hadoop.hbase.regionserver.HeapMemoryManager.TunerContext;
23  import org.apache.hadoop.hbase.regionserver.HeapMemoryManager.TunerResult;
24  
25  /**
26   * An implementation of HeapMemoryTuner which is not doing any tuning activity but just allows to
27   * continue with old style fixed proportions.
28   */
29  @InterfaceAudience.Private
30  public class NoOpHeapMemoryTuner implements HeapMemoryTuner {
31    
32    private static final TunerResult NO_OP_TUNER_RESULT = new TunerResult(false);
33  
34    @Override
35    public Configuration getConf() {
36      return null;
37    }
38  
39    @Override
40    public void setConf(Configuration conf) {
41  
42    }
43  
44    @Override
45    public TunerResult tune(TunerContext context) {
46      return NO_OP_TUNER_RESULT;
47    }
48  }