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/*
 * Copyright (c) 2014, Oracle America, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 *  * Neither the name of Oracle nor the names of its contributors may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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package org.openjdk.jmh.samples;

import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
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.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;

/**
 * Fixtures have different Levels to control when they are about to run.
 * Level.Invocation is useful sometimes to do some per-invocation work
 * which should not count as payload (e.g. sleep for some time to emulate
 * think time)
 */
@OutputTimeUnit(TimeUnit.MICROSECONDS)
public class JMHSample_07_FixtureLevelInvocation {

    /*
     * Fixtures have different Levels to control when they are about to run.
     * Level.Invocation is useful sometimes to do some per-invocation work,
     * which should not count as payload. PLEASE NOTE the timestamping and
     * synchronization for Level.Invocation helpers might significantly
     * offset the measurement, use with care. See Level.Invocation javadoc
     * for more discussion.
     *
     * Consider this sample:
     */

    /*
     * This state handles the executor.
     * Note we create and shutdown executor with Level.Trial, so
     * it is kept around the same across all iterations.
     */

    @State(Scope.Benchmark)
    public static class NormalState {
        ExecutorService service;

        @Setup(Level.Trial)
        public void up() {
            service = Executors.newCachedThreadPool();
        }

        @TearDown(Level.Trial)
        public void down() {
            service.shutdown();
        }

    }

    /*
     * This is the *extension* of the basic state, which also
     * has the Level.Invocation fixture method, sleeping for some time.
     */

    public static class LaggingState extends NormalState {
        public static final int SLEEP_TIME = Integer.getInteger("sleepTime", 10);

        @Setup(Level.Invocation)
        public void lag() throws InterruptedException {
            TimeUnit.MILLISECONDS.sleep(SLEEP_TIME);
        }
    }

    /*
     * This allows us to formulate the task: measure the task turnaround in
     * "hot" mode when we are not sleeping between the submits, and "cold" mode,
     * when we are sleeping.
     */

    @Benchmark
    @BenchmarkMode(Mode.AverageTime)
    public double measureHot(NormalState e, final Scratch s) throws ExecutionException, InterruptedException {
        return e.service.submit(new Task(s)).get();
    }

    @Benchmark
    @BenchmarkMode(Mode.AverageTime)
    public double measureCold(LaggingState e, final Scratch s) throws ExecutionException, InterruptedException {
        return e.service.submit(new Task(s)).get();
    }

    /*
     * This is our scratch state which will handle the work.
     */

    @State(Scope.Thread)
    public static class Scratch {
        private double p;
        public double doWork() {
            p = Math.log(p);
            return p;
        }
    }

    public static class Task implements Callable {
        private Scratch s;

        public Task(Scratch s) {
            this.s = s;
        }

        @Override
        public Double call() {
            return s.doWork();
        }
    }

    /*
     * ============================== HOW TO RUN THIS TEST: ====================================
     *
     * You can see the cold scenario is running longer, because we pay for
     * thread wakeups.
     *
     * You can run this test:
     *
     * a) Via the command line:
     *    $ mvn clean install
     *    $ java -jar target/benchmarks.jar JMHSample_07 -wi 5 -i 5 -f 1
     *    (we requested 5 warmup/measurement iterations, single fork)
     *
     * b) Via the Java API:
     *    (see the JMH homepage for possible caveats when running from IDE:
     *      http://openjdk.java.net/projects/code-tools/jmh/)
     */

    public static void main(String[] args) throws RunnerException {
        Options opt = new OptionsBuilder()
                .include(JMHSample_07_FixtureLevelInvocation.class.getSimpleName())
                .warmupIterations(5)
                .measurementIterations(5)
                .forks(1)
                .build();

        new Runner(opt).run();
    }

}