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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.hbase.classification.InterfaceAudience;
24  import org.apache.hadoop.hbase.classification.InterfaceStability;
25  import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
26  
27  /**
28   * This class is for maintaining the various master statistics
29   * and publishing them through the metrics interfaces.
30   * <p>
31   * This class has a number of metrics variables that are publicly accessible;
32   * these variables (objects) have methods to update their values.
33   */
34  @InterfaceStability.Evolving
35  @InterfaceAudience.Private
36  public class MetricsMaster {
37    private static final Log LOG = LogFactory.getLog(MetricsMaster.class);
38    private MetricsMasterSource masterSource;
39    private MetricsMasterProcSource masterProcSource;
40  
41    public MetricsMaster(MetricsMasterWrapper masterWrapper) {
42      masterSource = CompatibilitySingletonFactory.getInstance(MetricsMasterSourceFactory.class).create(masterWrapper);
43      masterProcSource =
44              CompatibilitySingletonFactory.getInstance(MetricsMasterProcSourceFactory.class).create(masterWrapper);
45    }
46  
47    // for unit-test usage
48    public MetricsMasterSource getMetricsSource() {
49      return masterSource;
50    }
51  
52    public MetricsMasterProcSource getMetricsProcSource() {
53      return masterProcSource;
54    }
55  
56    /**
57     * @param inc How much to add to requests.
58     */
59    public void incrementRequests(final long inc) {
60      masterSource.incRequests(inc);
61    }
62  }