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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements. See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache license, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License. You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the license for the specific language governing permissions and
15   * limitations under the license.
16   */
17  
18  package org.apache.logging.log4j.perf.jmh;
19  
20  import java.util.UUID;
21  
22  import org.apache.logging.log4j.core.util.UuidUtil;
23  import org.openjdk.jmh.annotations.GenerateMicroBenchmark;
24  
25  /**
26   * Compares random UUID generation with time-based UUID generation.
27   */
28  // ============================== HOW TO RUN THIS TEST: ====================================
29  //
30  // java -jar log4j-perf/target/microbenchmarks.jar ".*UuidGeneratorBenchmark.*" -f 1 -wi 5 -i 5
31  //
32  // Usage help:
33  // java -jar log4j-perf/target/microbenchmarks.jar -help
34  //
35  public class UuidGeneratorBenchmark {
36  
37      @GenerateMicroBenchmark
38      public UUID base() {
39          return null;
40      }
41  
42      @GenerateMicroBenchmark
43      public UUID randomUUID() {
44          return UUID.randomUUID();
45      }
46  
47      @GenerateMicroBenchmark
48      public UUID timeBasedUUID() {
49          return UuidUtil.getTimeBasedUuid();
50      }
51  }