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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.replication.regionserver;
20  
21  import org.apache.hadoop.hbase.classification.InterfaceAudience;
22  import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
23  
24  /**
25   * This class is for maintaining the various replication statistics for a sink and publishing them
26   * through the metrics interfaces.
27   */
28  @InterfaceAudience.Private
29  public class MetricsSink {
30  
31    private long lastTimestampForAge = System.currentTimeMillis();
32    private final MetricsReplicationSinkSource mss;
33  
34    public MetricsSink() {
35      mss =
36          CompatibilitySingletonFactory.getInstance(MetricsReplicationSourceFactory.class).getSink();
37    }
38  
39    /**
40     * Set the age of the last applied operation
41     *
42     * @param timestamp The timestamp of the last operation applied.
43     * @return the age that was set
44     */
45    public long setAgeOfLastAppliedOp(long timestamp) {
46      long age = 0;
47      if (lastTimestampForAge != timestamp) {
48        lastTimestampForAge = timestamp;
49        age = System.currentTimeMillis() - lastTimestampForAge;
50      } 
51      mss.setLastAppliedOpAge(age);
52      return age;
53    }
54  
55    /**
56     * Refreshing the age makes sure the value returned is the actual one and
57     * not the one set a replication time
58     * @return refreshed age
59     */
60    public long refreshAgeOfLastAppliedOp() {
61      return setAgeOfLastAppliedOp(lastTimestampForAge);
62    }
63  
64    /**
65     * Convience method to change metrics when a batch of operations are applied.
66     *
67     * @param batchSize
68     */
69    public void applyBatch(long batchSize) {
70      mss.incrAppliedBatches(1);
71      mss.incrAppliedOps(batchSize);
72    }
73  
74  }