/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements. See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache license, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License. You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the license for the specific language governing permissions and
   * limitations under the license.
   */
  package org.apache.logging.log4j.perf.jmh;
  
  import java.io.File;
  import java.util.Arrays;
  import java.util.concurrent.TimeUnit;
  
  import org.openjdk.jmh.annotations.BenchmarkMode;
  import org.openjdk.jmh.annotations.GenerateMicroBenchmark;
  import org.openjdk.jmh.annotations.Level;
  import org.openjdk.jmh.annotations.Mode;
  import org.openjdk.jmh.annotations.OutputTimeUnit;
  import org.openjdk.jmh.annotations.Scope;
  import org.openjdk.jmh.annotations.Setup;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.TearDown;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import ch.qos.logback.core.spi.LifeCycle;
  
  /**
   * Tests Logback Async Appender performance.
   */
  // ============================== HOW TO RUN THIS TEST: ====================================
  //
  // single thread:
  // java -jar log4j-perf/target/microbenchmarks.jar ".*Async.*Benchmark.*" -f 1 -wi 5 -i 5
  //
  // multiple threads (for example, 4 threads):
  // java -jar log4j-perf/target/microbenchmarks.jar ".*Async.*Benchmark.*" -f 1 -wi 5 -i 5 -t 4 -si true
  //
  // Usage help:
  // java -jar log4j-perf/target/microbenchmarks.jar -help
  //
  public class LogbackAsyncAppenderBenchmark {
  
      final static char[] CHARS = new char[500];
      static {
          Arrays.fill(CHARS, 'a');
      }
      final static String TEST = new String(CHARS);
  
      @State(Scope.Benchmark)
      public static class NormalState {
          Logger logger;
  
          @Setup(Level.Trial)
          public void up() {
              System.setProperty("logback.configurationFile", "perf-logback-async.xml");
              logger = (Logger) LoggerFactory.getLogger(getClass());
          }
  
          @TearDown(Level.Trial)
          public void down() {
              ((LifeCycle) LoggerFactory.getILoggerFactory()).stop();
              new File("perftest.log").delete();
          }
      }
  
      @GenerateMicroBenchmark
      @BenchmarkMode(Mode.Throughput)
      @OutputTimeUnit(TimeUnit.SECONDS)
      public boolean throughputBaseline(final NormalState e) {
          return e.logger.isInfoEnabled();
      }
  
      @GenerateMicroBenchmark
      @BenchmarkMode(Mode.Throughput)
      @OutputTimeUnit(TimeUnit.SECONDS)
      public void throughput(final NormalState e) {
          e.logger.info(TEST);
      }
  
      @GenerateMicroBenchmark
      @BenchmarkMode(Mode.SampleTime)
      @OutputTimeUnit(TimeUnit.NANOSECONDS)
      public boolean latencyBaseline(final NormalState e) {
          return e.logger.isInfoEnabled();
      }
  
      @GenerateMicroBenchmark
      @BenchmarkMode(Mode.SampleTime)
      @OutputTimeUnit(TimeUnit.NANOSECONDS)
     public void latency(final NormalState e) {
         e.logger.info(TEST);
     }
 }