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 package org.apache.hadoop.hbase.client;
19
20 import org.apache.hadoop.hbase.HRegionLocation;
21 import org.apache.hadoop.hbase.ServerName;
22 import org.apache.hadoop.hbase.classification.InterfaceAudience;
23 import org.apache.hadoop.hbase.protobuf.generated.ClientProtos;
24
25 /**
26 * A {@link Result} with some statistics about the server/region status
27 */
28 @InterfaceAudience.Private
29 public final class ResultStatsUtil {
30
31 private ResultStatsUtil() {
32 //private ctor for util class
33 }
34
35 /**
36 * Update the stats for the specified region if the result is an instance of {@link
37 * ResultStatsUtil}
38 *
39 * @param r object that contains the result and possibly the statistics about the region
40 * @param serverStats stats tracker to update from the result
41 * @param server server from which the result was obtained
42 * @param regionName full region name for the stats.
43 * @return the underlying {@link Result} if the passed result is an {@link
44 * ResultStatsUtil} or just returns the result;
45 */
46 public static <T> T updateStats(T r, ServerStatisticTracker serverStats,
47 ServerName server, byte[] regionName) {
48 if (!(r instanceof Result)) {
49 return r;
50 }
51 Result result = (Result) r;
52 // early exit if there are no stats to collect
53 ClientProtos.RegionLoadStats stats = result.getStats();
54 if(stats == null){
55 return r;
56 }
57
58 if (regionName != null) {
59 serverStats.updateRegionStats(server, regionName, stats);
60 }
61
62 return r;
63 }
64
65 public static <T> T updateStats(T r, ServerStatisticTracker stats,
66 HRegionLocation regionLocation) {
67 byte[] regionName = null;
68 ServerName server = null;
69 if (regionLocation != null) {
70 server = regionLocation.getServerName();
71 regionName = regionLocation.getRegionInfo().getRegionName();
72 }
73
74 return updateStats(r, stats, server, regionName);
75 }
76 }