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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  
19  package org.apache.hadoop.hbase.master;
20  
21  import org.apache.commons.logging.Log;
22  import org.apache.commons.logging.LogFactory;
23  import org.apache.hadoop.classification.InterfaceAudience;
24  import org.apache.hadoop.classification.InterfaceStability;
25  import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
26  import org.apache.hadoop.hbase.master.MetricsMasterSource;
27  import org.apache.hadoop.hbase.master.MetricsMasterSourceFactory;
28  import org.apache.hadoop.hbase.master.MetricsMasterWrapper;
29  
30  /**
31   * This class is for maintaining the various master statistics
32   * and publishing them through the metrics interfaces.
33   * <p>
34   * This class has a number of metrics variables that are publicly accessible;
35   * these variables (objects) have methods to update their values.
36   */
37  @InterfaceStability.Evolving
38  @InterfaceAudience.Private
39  public class MetricsMaster {
40    private final Log LOG = LogFactory.getLog(this.getClass());
41    private MetricsMasterSource masterSource;
42  
43    public MetricsMaster(MetricsMasterWrapper masterWrapper) {
44      masterSource = CompatibilitySingletonFactory.getInstance(MetricsMasterSourceFactory.class).create(masterWrapper);
45    }
46  
47    // for unit-test usage
48    public MetricsMasterSource getMetricsSource() {
49      return masterSource;
50    }
51  
52    /**
53     * @param inc How much to add to requests.
54     */
55    public void incrementRequests(final int inc) {
56      masterSource.incRequests(inc);
57    }
58  }