001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements. See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache license, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License. You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the license for the specific language governing permissions and
015     * limitations under the license.
016     */
017    
018    package org.apache.logging.log4j.perf.jmh;
019    
020    import java.util.UUID;
021    
022    import org.apache.logging.log4j.core.util.UuidUtil;
023    import org.openjdk.jmh.annotations.GenerateMicroBenchmark;
024    
025    /**
026     * Compares random UUID generation with time-based UUID generation.
027     */
028    // ============================== HOW TO RUN THIS TEST: ====================================
029    //
030    // java -jar log4j-perf/target/microbenchmarks.jar ".*UuidGeneratorBenchmark.*" -f 1 -wi 5 -i 5
031    //
032    // Usage help:
033    // java -jar log4j-perf/target/microbenchmarks.jar -help
034    //
035    public class UuidGeneratorBenchmark {
036    
037        @GenerateMicroBenchmark
038        public UUID base() {
039            return null;
040        }
041    
042        @GenerateMicroBenchmark
043        public UUID randomUUID() {
044            return UUID.randomUUID();
045        }
046    
047        @GenerateMicroBenchmark
048        public UUID timeBasedUUID() {
049            return UuidUtil.getTimeBasedUuid();
050        }
051    }