/*
 * 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 org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.ThreadContext;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.Param;
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;
import org.slf4j.MDC;

/**
 * Benchmarks Log4j 2 and Logback ThreadContext/MDC Filter performance.
 */
// HOW TO RUN THIS TEST
// single thread:
// java -jar target/benchmarks.jar ".*MDCFilterBenchmark.*" -f 1 -i 5 -wi 5 -bm sample -tu ns
//
// multiple threads (for example, 4 threads):
// java -jar target/benchmarks.jar ".*MDCFilterBenchmark.*" -f 1 -i 5 -wi 5 -t 4 -si true -bm sample -tu ns

@State(Scope.Benchmark)
public class MDCFilterBenchmark {
    // Loggers are Benchmark scope, just like in a real application:
    // different threads may use the same logger instance, which may have some lock contention.
    Logger log4jLogger;
    org.slf4j.Logger slf4jLogger;

    @Param({"0", "4"})
    public int size;

    static int staticSize;

    @State(Scope.Thread)
    public static class ThreadContextState {
        // Thread scope: initialize MDC/ThreadContext here to ensure each thread has some value set
        public ThreadContextState() {
            for (int i = 0; i < staticSize; i++) {
                ThreadContext.put("user" + i, "Apache");
                MDC.put("user" + i, "Apache");
            }
        }

        public String message() {
            return "This is a test";
        }
    }

    @Setup
    public void setUp() {
        System.setProperty("log4j.configurationFile", "log4j2-threadContextFilter-perf.xml");
        System.setProperty("logback.configurationFile", "logback-mdcFilter-perf.xml");

        log4jLogger = LogManager.getLogger(MDCFilterBenchmark.class);
        slf4jLogger = LoggerFactory.getLogger(MDCFilterBenchmark.class);

        staticSize = size;
    }

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

    @Benchmark
    public boolean baseline() {
        return true;
    }

    @Benchmark
    public void log4jThreadContextFilter(final ThreadContextState state) {
        log4jLogger.info(state.message());
    }

    @Benchmark
    public void slf4jMDCFilter(final ThreadContextState state) {
        slf4jLogger.info(state.message());
    }
}
