// @nuget: Newtonsoft.Json -Version 13.0.1

using System;

using System.Threading;

using System.Threading.Tasks;

using System.Diagnostics;

using Newtonsoft.Json;

​

//同步单线程 https://dotnetfiddle.net/#&togetherjs=lqtQ9gMvuR

//同步多线程 https://dotnetfiddle.net/Widget/CxquMu

//异步多线程 https://dotnetfiddle.net/Widget/Euy16I

//异步线程锁 https://dotnetfiddle.net/Widget/65afXg

namespace AsyncBreakfast

{

    class Program

    {

        //有多个煎锅，信号量

        private static readonly SemaphoreSlim fryPans = new SemaphoreSlim(3, 3);

        static async Task Main(string[] args)

        {

            Console.OutputEncoding = System.Text.Encoding.UTF8;

            Stopwatch sw = new Stopwatch();

            //开始计时  

            sw.Start();

            //同步等待，顺序执行单线程任务

            Coffee cup = PourCoffee();

            Console.WriteLine("主线程ID: {0}", Thread.CurrentThread.ManagedThreadId);

            Console.WriteLine("1.咖啡准备完毕");

            Console.WriteLine("线程 {0} 停止使用煎锅;煎锅总数: {1}.", Task.CurrentId, fryPans.CurrentCount);

            Task<Egg> eggsTask = FryEggsAsync(2);

            Task<Bacon> baconTask = FryBaconAsync(3);

            Task<Toast> toastTask = ToastBreadAsync(2);

            Egg eggs = await eggsTask;

            Console.WriteLine("主线程ID: {0}", Thread.CurrentThread.ManagedThreadId);

            Console.WriteLine("2.鸡蛋准备完毕");

            Bacon bacon = await baconTask;

            Console.WriteLine("主线程ID: {0}", Thread.CurrentThread.ManagedThreadId);

            Console.WriteLine("3.培根准备完毕");

            //Console.WriteLine(JsonConvert.SerializeObject(eggs));

            Toast toast = await toastTask;

            ApplyButter(toast);

            ApplyJam(toast);

            Console.WriteLine("面包线程ID: {0}", Thread.CurrentThread.ManagedThreadId);

            Console.WriteLine("4.面包准备完毕");

            Juice oj = PourOJ();

            Console.WriteLine("5.橙汁准备完毕");

            Console.WriteLine("主线程ID: {0}", Thread.CurrentThread.ManagedThreadId);

            Console.WriteLine(">_< 早餐准备完毕！");

            //结束计时  

            sw.Stop();

            //获取运行时间间隔  

            TimeSpan ts = sw.Elapsed;

            //获取运行时间[毫秒]  

            long times = sw.ElapsedMilliseconds;

            Console.WriteLine($"总用时{times}");

        }

​

        private static Juice PourOJ()

        {

            Console.WriteLine("倒橙汁");

            return new Juice();

        }

​

        private static void ApplyJam(Toast toast) => Console.WriteLine("给面包刷果酱");

        private static void ApplyButter(Toast toast) => Console.WriteLine("给面包加黄油");

        private static async Task<Toast> ToastBreadAsync(int slices)

        {

            return await Task.Run(() =>

            {

                Console.WriteLine("烤面包线程ID: {0}", Thread.CurrentThread.ManagedThreadId);

                try

                {

                    fryPans.Wait();

                    Console.WriteLine("线程 {0} 使用煎锅;煎锅总数: {1}.", Task.CurrentId, fryPans.CurrentCount);

                    for (int slice = 0; slice < slices; slice++)

                    {

                        Console.WriteLine("将一片面包放到烤面包机");

                    }

​

                    Console.WriteLine("开始烤面包");

                    Task.Delay(300).Wait();

                    Console.WriteLine("烤面包完成");

                }

                finally

                {

                    fryPans.Release();

                }

​

                return new Toast();

            });

        }

​

        private static async Task<Bacon> FryBaconAsync(int slices)

        {

            return await Task.Run(() =>

            {

                Console.WriteLine("煎培根线程ID: {0}", Thread.CurrentThread.ManagedThreadId);

                try

                {

                    fryPans.Wait();

                    Console.WriteLine("线程 {0} 使用煎锅;煎锅总数: {1}.", Task.CurrentId, fryPans.CurrentCount);

                    Console.WriteLine($"将{slices}片培根放到煎锅");

                    Console.WriteLine("煎培根第一面");

                    Task.Delay(300).Wait();

                    for (int slice = 0; slice < slices; slice++)

                    {

                        Console.WriteLine("给培根翻面");

                    }

​

                    Console.WriteLine("煎培根第二面");

                    Task.Delay(300).Wait();

                    Console.WriteLine("将培根放到盘子");

                }

                finally

                {

                    fryPans.Release();

                }

​

                return new Bacon();

            });

        }

​

        private static async Task<Egg> FryEggsAsync(int howMany)

        {

            return await Task.Run(() =>

            {

                Console.WriteLine("煎蛋线程ID: {0}", Thread.CurrentThread.ManagedThreadId);

                try

                {

                    fryPans.Wait();

                    Console.WriteLine("线程 {0} 使用煎锅;煎锅总数: {1}.", Task.CurrentId, fryPans.CurrentCount);

                    Console.WriteLine("加热煎蛋锅");

                    Task.Delay(300).Wait();

                    Console.WriteLine($"打碎{howMany}个蛋");

                    Console.WriteLine("煎蛋中 ...");

                    Task.Delay(300).Wait();

                    Console.WriteLine("将煎蛋放到盘子");

                }

                finally

                {

                    fryPans.Release();

                }

​

                return new Egg();

            });

        }

​

        private static Coffee PourCoffee()

        {

            Console.WriteLine("冲咖啡");

            return new Coffee();

        }

    }

​

    public class Coffee

    {

    }

​

    public class Egg

    {

    }

​

    public class Bacon

    {

    }

​

    public class Toast

    {

    }

​

    public class Juice

    {

    }

}