/*
 * 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.concurrent.TimeUnit;
import java.util.logging.FileHandler;
import java.util.logging.Level;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
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.LoggerFactory;

/**
 * Benchmarks Log4j 2, Log4j 1, Logback and JUL using the DEBUG level which is enabled for this test. The configuration
 * for each uses a FileAppender
 */
// HOW TO RUN THIS TEST
// java -jar log4j-perf/target/benchmarks.jar ".*FileAppenderBenchmark.*" -f 1 -wi 10 -i 20
//
// RUNNING THIS TEST WITH 4 THREADS:
// java -jar log4j-perf/target/benchmarks.jar ".*FileAppenderBenchmark.*" -f 1 -wi 10 -i 20 -t 4
@State(Scope.Thread)
public class FileAppenderBenchmark {
    public static final String MESSAGE = "This is a debug message";
    private FileHandler julFileHandler;

    Logger log4j2Logger;
    Logger log4j2AsyncAppender;
    Logger log4j2AsyncLogger;
    Logger log4j2AsyncDisruptor;
    Logger log4j2RandomLogger;
    Logger log4j2MemoryLogger;
    org.slf4j.Logger slf4jLogger;
    org.slf4j.Logger slf4jAsyncLogger;
    org.apache.log4j.Logger log4j1Logger;
    java.util.logging.Logger julLogger;

    @Setup
    public void setUp() throws Exception {
        System.setProperty("log4j.configurationFile", "log4j2-perf.xml");
        System.setProperty("log4j.configuration", "log4j12-perf.xml");
        System.setProperty("logback.configurationFile", "logback-perf.xml");

        deleteLogFiles();

        log4j2Logger = LogManager.getLogger(FileAppenderBenchmark.class);
        log4j2AsyncAppender = LogManager.getLogger("AsyncAppender");
        log4j2AsyncDisruptor = LogManager.getLogger("AsyncDisruptorAppender");
        log4j2AsyncLogger = LogManager.getLogger("AsyncLogger");
        log4j2MemoryLogger = LogManager.getLogger("MemoryMapped");
        log4j2RandomLogger = LogManager.getLogger("TestRandom");
        slf4jLogger = LoggerFactory.getLogger(FileAppenderBenchmark.class);
        slf4jAsyncLogger = LoggerFactory.getLogger("Async");
        log4j1Logger = org.apache.log4j.Logger.getLogger(FileAppenderBenchmark.class);

        julFileHandler = new FileHandler("target/testJulLog.log");
        julLogger = java.util.logging.Logger.getLogger(getClass().getName());
        julLogger.setUseParentHandlers(false);
        julLogger.addHandler(julFileHandler);
        julLogger.setLevel(Level.ALL);
    }

    @TearDown
    public void tearDown() {
        System.clearProperty("log4j.configurationFile");
        System.clearProperty("log4j.configuration");
        System.clearProperty("logback.configurationFile");

        deleteLogFiles();
    }

    private void deleteLogFiles() {
        final File logbackFile = new File("target/testlogback.log");
        logbackFile.delete();
        final File log4jFile = new File ("target/testlog4j.log");
        log4jFile.delete();
        final File log4jRandomFile = new File ("target/testRandomlog4j2.log");
        log4jRandomFile.delete();
        final File log4jMemoryFile = new File ("target/testMappedlog4j2.log");
        log4jMemoryFile.delete();
        final File log4j2File = new File ("target/testlog4j2.log");
        log4j2File.delete();
        final File julFile = new File("target/testJulLog.log");
        julFile.delete();
    }

    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    @Benchmark
    public void log4j2RAF() {
        log4j2RandomLogger.debug(MESSAGE);
    }

    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    @Benchmark
    public void log4j2MMF() {
        log4j2MemoryLogger.debug(MESSAGE);
    }

    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    @Benchmark
    public void log4j2AsyncAppender() {
        log4j2AsyncAppender.debug(MESSAGE);
    }

    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    @Benchmark
    public void log4j2AsyncDisruptor() {
        log4j2AsyncDisruptor.debug(MESSAGE);
    }

    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    @Benchmark
    public void log4j2AsyncLogger() {
        log4j2AsyncLogger.debug(MESSAGE);
    }

    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    @Benchmark
    public void log4j2File() {
        log4j2Logger.debug(MESSAGE);
    }

    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    @Benchmark
    public void logbackFile() {
        slf4jLogger.debug(MESSAGE);
    }

    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    @Benchmark
    public void logbackAsyncFile() {
        slf4jAsyncLogger.debug(MESSAGE);
    }

    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    @Benchmark
    public void log4j1File() {
        log4j1Logger.debug(MESSAGE);
    }

    @BenchmarkMode(Mode.Throughput)
    @OutputTimeUnit(TimeUnit.SECONDS)
    @Benchmark
    public void julFile() {
        // must specify sourceClass or JUL will look it up by walking the stack trace!
        julLogger.logp(Level.INFO, getClass().getName(), "julFile", MESSAGE);
    }
}

@@ -2954,32 +2954,34 @@
 gger%22);%0A        
+//
 log4j2MemoryLogg
@@ -4657,32 +4657,34 @@
 GE);%0A    %7D%0A%0A    
+/*
 @BenchmarkMode(M
@@ -4822,32 +4822,34 @@
 (MESSAGE);%0A    %7D
+*/
 %0A%0A    @Benchmark

Comment out test that doesn't work in Java 11