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1   /*
2    * Copyright 2020 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.handler.codec.mqtt;
17  
18  import io.netty.microbench.util.AbstractMicrobenchmark;
19  import org.openjdk.jmh.annotations.Benchmark;
20  import org.openjdk.jmh.annotations.BenchmarkMode;
21  import org.openjdk.jmh.annotations.Measurement;
22  import org.openjdk.jmh.annotations.Mode;
23  import org.openjdk.jmh.annotations.OutputTimeUnit;
24  import org.openjdk.jmh.annotations.Setup;
25  import org.openjdk.jmh.annotations.Warmup;
26  
27  import java.util.concurrent.TimeUnit;
28  
29  @BenchmarkMode(Mode.AverageTime)
30  @Warmup(iterations = 5, time = 5)
31  @Measurement(iterations = 5, time = 5)
32  @OutputTimeUnit(TimeUnit.NANOSECONDS)
33  public class MqttQoSValueOfBench extends AbstractMicrobenchmark {
34  
35      private static final int[] DATASET = new int[] {
36              2, 0, 2, 2, 2, 0, 1, 2, 0, 1, 0, 1, 128, 1, 1, 2, 0, 2, 2, 1, 2, 1, 2, 0, 1, 2, 1, 0, 2, 1, 1, 2, 1, 128,
37              2, 2, 1, 2, 2, 1, 1, 128, 0, 128, 2, 2, 1, 1, 2, 128, 128, 128, 128, 128, 0, 2, 128, 128, 2, 1, 128, 1, 0,
38              2, 1, 0, 2, 0, 2, 0, 2, 128, 2, 2, 128, 0, 128, 2, 128, 0, 0, 1, 2, 1, 128, 0, 2, 0, 2, 0, 0, 128, 2, 0,
39              0, 2, 2, 0, 2, 128, 0, 2, 1, 1, 0, 2, 2, 128, 1, 128, 0, 0, 1, 128, 0, 2, 128, 0, 2, 2, 128, 2, 128, 128,
40              0, 2, 128, 0, 1, 2, 2, 1, 128, 0, 1, 128, 1, 2, 0, 0, 2, 0, 128, 0, 1, 0, 0, 1, 0, 1, 2, 128, 128, 1, 2,
41              128, 0, 1, 1, 1, 1, 0, 2, 1, 1, 128, 1, 2, 128, 128, 1, 0, 128, 1, 2, 2, 128, 2, 0, 0, 2, 2, 128, 1, 1,
42              0, 0, 2, 0, 2, 2, 2, 1, 2, 0, 128, 0, 1, 128, 0, 2, 128, 1, 2, 1, 1, 1, 1, 1, 1, 1, 128, 1, 128, 1, 2,
43              0, 0, 128, 128, 1, 2, 2, 0, 0, 0, 2, 128, 128, 0, 1, 128, 1, 128, 1, 2, 128, 2, 0, 0, 2, 128, 128, 0, 2,
44              1, 1, 0, 0, 1, 128, 1, 128, 2, 128, 1, 1, 128, 1, 1, 1, 2, 2, 2, 128, 128, 0, 1, 1, 2, 128, 1, 0, 2, 2,
45              2, 2, 1, 1, 0, 128, 1, 128, 2, 1, 1, 0, 128, 0, 2, 128, 128, 2, 0, 128, 128, 1, 128, 0, 1, 128, 0, 128,
46              1, 1, 2, 128, 0, 2, 128, 2, 0, 128, 0, 1, 0, 0, 0, 2, 0, 2, 1, 2, 1, 2, 0, 2, 2, 128, 128, 2, 0, 2, 1,
47              128, 1, 128, 1, 0, 128, 0, 0, 128, 1, 0, 128, 1, 0, 128, 0, 128, 1, 2, 1, 128, 2, 0, 1, 0, 1, 2, 1, 0,
48              1, 2, 2, 2, 1, 0, 0, 128, 1, 2, 128, 0, 2, 128, 0, 1, 2, 128, 2, 1, 1, 2, 2, 0, 0, 2, 1, 1, 128, 0, 2,
49              1, 128, 128, 128, 1, 1, 0, 128, 0, 0, 1, 128, 0, 2, 1, 2, 1, 0, 1, 0, 0, 1, 128, 1, 2, 128, 128, 2, 1, 1,
50              0, 1, 0, 1, 2, 0, 128, 2, 0, 2, 1, 2, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 128, 0, 1, 2, 0, 0, 2, 2, 2, 0, 0,
51              128, 1, 0, 0, 0, 1, 2, 128, 2, 0, 128, 128, 128, 128, 2, 2, 0, 1, 1, 0, 1, 128, 128, 1, 0, 0, 128, 128,
52              1, 2, 128, 2, 128, 128, 128, 2, 0, 1, 128, 1, 0, 1, 2, 128, 128, 2, 2, 0, 0, 1, 1, 0, 1, 1, 0, 128, 0,
53              0, 0, 128, 0, 0, 0, 128, 2, 1, 0, 1, 1, 0, 2, 1, 1, 0, 2, 1, 2, 1, 2, 0, 0, 2, 128, 128, 0, 0, 2, 128,
54              0, 128, 2, 2, 128, 0, 128, 1, 1, 0, 0, 128, 2, 1, 2, 128, 0, 2, 128, 1, 0, 1, 2, 0, 0, 128, 128, 0, 1,
55              2, 128, 1, 2, 2, 0, 128, 2, 1, 0, 1, 128, 128, 2, 0, 1, 0, 0, 2, 0, 128, 2, 2, 1, 128, 128, 128, 1, 0,
56              128, 2, 128, 1, 128, 1, 1, 2, 0, 128, 0, 1, 0, 128, 0, 2, 2, 0, 0, 2, 128, 128, 2, 0, 128, 1, 128, 128,
57              2, 1, 1, 2, 0, 2, 128, 0, 0, 0, 2, 2, 2, 0, 128, 0, 1, 2, 1, 128, 1, 2, 2, 0, 128, 1, 1, 1, 128, 2, 2,
58              128, 0, 0, 1, 2, 1, 1, 2, 0, 1, 2, 128, 2, 2, 128, 128, 0, 128, 1, 1, 128, 128, 128, 2, 1, 1, 1, 2, 1,
59              1, 0, 1, 128, 0, 2, 2, 0, 1, 2, 128, 128, 128, 2, 128, 128, 128, 2, 2, 2, 0, 128, 2, 128, 1, 0, 128,
60              128, 2, 128, 0, 2, 1, 128, 128, 0, 1, 1, 0, 128, 0, 0, 2, 1, 0, 2, 1, 2, 128, 0, 128, 1, 128, 1, 0, 2,
61              1, 1, 1, 2, 1, 0, 1, 128, 2, 2, 0, 1, 128, 1, 0, 1, 0, 0, 128, 0, 128, 2, 2, 128, 128, 1, 0, 128, 1, 0,
62              2, 1, 128, 128, 0, 0, 0, 0, 128, 2, 2, 1, 128, 1, 0, 1, 128, 0, 128, 128, 1, 128, 0, 2, 2, 2, 0, 2, 0,
63              1, 1, 2, 1, 1, 1, 128, 0, 2, 2, 2, 0, 2, 0, 1, 1, 1, 128, 128, 128, 128, 2, 128, 1, 0, 1, 1, 1, 1, 2, 2,
64              1, 0, 128, 2, 128, 128, 0, 1, 128, 128, 128, 128, 128, 1, 0, 2, 0, 128, 0, 0, 2, 2, 0, 1, 2, 1, 0, 2, 128,
65              0, 2, 2, 2, 0, 0, 1, 128, 2, 1, 128, 128, 1, 128, 0, 1, 128, 1, 1, 1, 2, 0, 128, 1, 128, 2, 2, 0, 2, 0,
66              0, 0, 0, 0, 2, 128, 0, 1, 2, 0, 0, 2, 2, 2, 0, 0, 0, 1, 0, 128, 1, 0, 1, 1, 128, 128, 128, 1, 128, 0, 128,
67              2, 1, 2, 1, 0, 1, 2, 128, 2, 1, 1, 2, 1, 128, 1, 2, 0, 2, 128, 2, 128, 2, 2, 1, 1, 128, 2, 2, 0, 128, 0, 2,
68              1, 128, 128, 128, 0, 1, 2, 2, 2, 0, 0, 128, 1, 2, 2, 128, 128, 128, 1, 128, 0, 2, 2, 1, 2, 2, 2, 0, 0, 2,
69              2, 0, 2, 2, 128, 0, 2, 128, 1, 0, 1, 128, 1, 0, 128, 1, 128, 1, 0, 1, 2, 1, 128, 1, 128, 2, 128, 128, 1,
70              2, 128, 1, 2, 0, 2
71      };
72  
73      int[] types;
74      long next;
75      long mask;
76  
77      @Setup
78      public void initDataSet() {
79          types = DATASET;
80          next = 0;
81          mask = types.length - 1;
82          if (Integer.bitCount(types.length) != 1) {
83              throw new AssertionError("The data set should contains power of 2 items");
84          }
85      }
86  
87      @Benchmark
88      public MqttQoS getViaArray() {
89          long next = this.next;
90          int nextIndex = (int) (next & mask);
91          MqttQoS mqttQoS = arrayValueOf(types[nextIndex]);
92          this.next = next + 1;
93          return mqttQoS;
94      }
95  
96      @Benchmark
97      public MqttQoS getViaSwitch() {
98          long next = this.next;
99          int nextIndex = (int) (next & mask);
100         MqttQoS mqttQoS = MqttQoS.valueOf(types[nextIndex]);
101         this.next = next + 1;
102         return mqttQoS;
103     }
104 
105     private static final MqttQoS[] VALUES;
106 
107     static {
108         VALUES = new MqttQoS[129];
109         for (MqttQoS value : MqttQoS.values()) {
110             VALUES[value.value()] = value;
111         }
112     }
113 
114     public static MqttQoS arrayValueOf(int value) {
115         MqttQoS mqttQoS = null;
116         try {
117             mqttQoS = VALUES[value];
118             return mqttQoS;
119         } catch (ArrayIndexOutOfBoundsException ignored) {
120             // nop
121         }
122         if (mqttQoS == null) {
123             throw new IllegalArgumentException("invalid QoS: " + value);
124         }
125         return mqttQoS;
126     }
127 }