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 final Log LOG = LogFactory.getLog(this.getClass());
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 }