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 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 static final Log LOG = LogFactory.getLog(MetricsMaster.class);
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 long inc) {
56 masterSource.incRequests(inc);
57 }
58 }