SmartThreadPool

示例

using Amib.Threading;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading;

namespace SmartThreadPoolDemo
{
    class Program
    {
        // SmartThreadPool网址 https://github.com/amibar/SmartThreadPool
        static void Main(string[] args)
        {
            #region 这个例子将演示传入数个参数并且等待运行然后传出的全过程    
            /*
                SmartThreadPool特性如下：
                池中的线程数量会根据负载自动增减
                任务异步执行后可以返回值
                处于任务队列中未执行的任务可以取消
                回调函数可以等待多个任务都执行完成后再触发
                任务可以有优先级(priority)
                任务可以分组
                支持泛型Action<T> 和 Func<T>
                有性能监测机制             
            */

            SmartThreadPool stp = new SmartThreadPool();

            IWorkItemResult<string> resultCallback = stp.QueueWorkItem(
                new Func<string, string, string>(GetResultstring), "hello ", "world"
                );

            var stopWtch = new Stopwatch();

            stopWtch.Start();

            Console.WriteLine("操作开始...");

            stp.Start();
            stp.WaitForIdle();//等待该实例下的所有结果返回

            Console.WriteLine(resultCallback.Result);

            stopWtch.Stop();

            Console.WriteLine("操作结束，耗时 {0}", stopWtch.ElapsedMilliseconds);
            stp.Shutdown();

            #endregion

            #region 这个例子将演示一批参数的传入一批线程并且等待执行结束返回值

            SmartThreadPool stp2 = new SmartThreadPool();
            List<IWorkItemResult> t_lResultItem = new List<IWorkItemResult>();//不对IWorkItemResult定义其类型，其结果需要自己做类型转换
            for (int i = 0; i < 100; i++)
            {
                t_lResultItem.Add(stp2.QueueWorkItem(
                    new WorkItemCallback(GetObjectString), new string[] { "hello ", i.ToString() }));
            }

            stp2.Start();

            //等待所需的结果返回
            if (SmartThreadPool.WaitAll(t_lResultItem.ToArray()))
            {
                foreach (IWorkItemResult t in t_lResultItem)
                {
                    Console.WriteLine("{0} : {1}", t.State, t.Result);
                }
            }

            #endregion

            #region 这个例子将演示处理线程执行过程中出现的错误

            SmartThreadPool stp3 = new SmartThreadPool();//如果需要将线程池设置为调用start的时候才运行，需要设置其StartSuspended参数为true，然后为其调用start方法来启动
            IWorkItemResult<double> ret = stp3.QueueWorkItem(
                new Func<double, double, double>(Diverse), 10, 0);
            //接收错误的句柄
            stp3.Start();

            double resule = ret.GetResult(out Exception e);//在取出结果的时候判断是否有错误产生
            if (e != null)
            {
                //在这里进行错误处理，错误在InnerException中
                Console.WriteLine("产生错误：" + e.InnerException.Message);
            }
            else
            {
                Console.WriteLine(resule.ToString());
            }

            stp3.Shutdown();

            #endregion

            #region 方法属性解释

            //SmartThreadPool的部分解释
            SmartThreadPool smartThreadPool = new SmartThreadPool();

            //获取当前线程池中的工作线程数,与InUseThreads可能会有差别,因为InUseThreads不包含Idle状态的线程
            int threadNum = smartThreadPool.ActiveThreads;

            //取消所有工作项,如果工作项在执行,那么等待工作项执行完
            smartThreadPool.Cancel();

            //如果不想等待工作项执行完,
            smartThreadPool.Cancel(true);

            //线程池的最大并发数,即MaxWorkerThreads,
            //如果修改后的Concurrency小于MinWorkerThreads,那么MinWorkerThreads也会随之改变
            smartThreadPool.Concurrency = 25;

            //创建一个工作组,最大并发为3,工作组在后面会详细说明,
            smartThreadPool.CreateWorkItemsGroup(3);

            //卸载线程池
            smartThreadPool.Dispose();

            //反回所有未执行的工作项的参数对象
            smartThreadPool.GetStates();

            //获取线程池中正在工作的线程数,与ActiveThreads会有差别,因为ActiveThreads可能包含Idle状态的线程
            int useThreadNum = smartThreadPool.InUseThreads;

            //当线程池用没有工作项时,反回true,否则,反回false
            bool IsIdle = smartThreadPool.IsIdle;

            //同时并行执行多个方法,并且阻塞到所有工作项都执行完,这里会有多少个工作项就会创造多少个线程,
            smartThreadPool.Join(new Action[] { new Action(Test1) });

            //获取或设置最大线程数,即MaxWorkerThreads,
            smartThreadPool.MaxThreads = 25;

            //最小线程数,当没有工作项时,线程池最多剩余的线程数
            smartThreadPool.MinThreads = 0;

            //线程池的名称,没什么特殊的用处,
            smartThreadPool.Name = "StartThreadPool";

            //当线程池中没有工作项(即闲置)时触发的事件
            smartThreadPool.OnIdle += new WorkItemsGroupIdleHandler(smartThreadPool_OnIdle);

            //当线程池启动一个线程时,触发的事件
            smartThreadPool.OnThreadInitialization += new ThreadInitializationHandler(smartThreadPool_OnThreadInitialization);

            //当线程池释放一个线程时,所触发的事件
            smartThreadPool.OnThreadTermination += new ThreadTerminationHandler(smartThreadPool_OnThreadTermination);

            //与Join方法类似,并行执行多个带参数的方法,这里会有多少个工作项就会创造多少个线程
            smartThreadPool.Pipe<object>(new object(), new Action<object>[] { new Action<object>(Test) });

            //卸载线程池
            smartThreadPool.Shutdown();

            //启动线程池
            smartThreadPool.Start();

            //STPStartInfo对象的只读实例
            STPStartInfo stpStartInfo = smartThreadPool.STPStartInfo;

            //等待所有的工作项执行完成(即IsIdle为true)
            smartThreadPool.WaitForIdle();

            //获取还未执行的工作项数量
            int wiNum = smartThreadPool.WaitingCallbacks;

            //WorkItemGroup的启动信息的只读实力
            WIGStartInfo wigStartInfo = smartThreadPool.WIGStartInfo;

            #endregion

            #region 简单调用实例


            //****************************使用示例****************************
            //创建一个线程池
            smartThreadPool = new SmartThreadPool();

            //执行任务
            smartThreadPool.QueueWorkItem(() =>
            {
                Console.WriteLine("Hello World!");
            });

            //****************************分割线****************************
            //创建一个线程池 带返回值的任务
            smartThreadPool = new SmartThreadPool();

            //执行任务
            var result = smartThreadPool.QueueWorkItem(() =>
            {
                var sum = 0;
                for (var i = 0; i < 10; i++)
                {
                    sum += i;
                }
                return sum;
            });
            Console.WriteLine(result.Result); //输出计算结果

            //****************************分割线****************************
            // 创建一个线程池 等待多个任务执行完成
            smartThreadPool = new SmartThreadPool();

            // 执行任务
            var result1 = smartThreadPool.QueueWorkItem(() =>
            {
                //模拟计算较长时间
                Thread.Sleep(5000);
                return 3;
            });

            var result2 = smartThreadPool.QueueWorkItem(() =>
            {
                //模拟计算较长时间
                Thread.Sleep(3000);
                return 5;
            });

            bool success = SmartThreadPool.WaitAll(new IWorkItemResult<int>[] { result1, result2 });
            if (success)
            {
                //输出结果
                Console.WriteLine(result1.Result);
                Console.WriteLine(result2.Result);
            }
            Console.ReadLine();

            #endregion

            Test();
        }

        #region 事件

        private static void Test1()
        {
        }

        private static void Test(object obj)
        {
        }

        private static void smartThreadPool_OnThreadTermination()
        {
        }

        private static void smartThreadPool_OnThreadInitialization()
        {
        }

        private static void smartThreadPool_OnIdle(IWorkItemsGroup workItemsGroup)
        {
        }

        #endregion

        static Random _random = new Random();

        /// <summary>
        /// 类似 易语言的写法 可能会出现 bug
        /// </summary>
        private static void Test()
        {
            var idleCount = 0;
            var workingCount = 0;
            var queueWorkCount = 0;
            var job = new ConcurrentQueue<int>();

            for (int i = 0; i < 100; i++)
                job.Enqueue(i);//模拟1000个任务

            #region 只投递空闲线程数

            var smartThreadPool = new SmartThreadPool(new STPStartInfo
            {
                MinWorkerThreads = 1, //最小线程数
                MaxWorkerThreads = 10, //最大线程数
                AreThreadsBackground = true, //设置为后台线程
            });

            #region 手动释放写法

            while (true)
            {
                idleCount = smartThreadPool.MaxThreads - smartThreadPool.InUseThreads;//最大线程数 减去 正在执行的线程数 等于 空闲线程数

                if (idleCount <= 0)
                {
                    smartThreadPool.WaitForIdle(1000);
                    continue;
                }

                if (job.Count <= 0)//剩下任务数为0
                {
                    if (smartThreadPool.IsIdle)//判断是否空闲
                        break;

                    smartThreadPool.WaitForIdle(1000);
                    continue;
                }

                if (job.Count > idleCount)
                    workingCount = idleCount;
                else
                    workingCount = job.Count;

                for (int i = 0; i < workingCount; i++)
                {
                    queueWorkCount++;
                    smartThreadPool.QueueWorkItem(() =>
                    {
                        job.TryDequeue(out int result);
                        Thread.Sleep(_random.Next(10000));//模拟工作耗时
                    });
                }

                if (queueWorkCount > 10)//模拟拨号 
                {
                    smartThreadPool.WaitForIdle();//等待所有任务执行完毕

                    // adsl拨号程序
                    Console.WriteLine("adsl");

                    Thread.Sleep(_random.Next(5000));//模拟拨号

                    queueWorkCount = 0;
                }

                smartThreadPool.WaitForIdle(1000);
            }

            smartThreadPool.Shutdown();
            smartThreadPool.Dispose();
            #endregion

            #region 自动释放写法

            using (smartThreadPool = new SmartThreadPool(new STPStartInfo
            {
                MinWorkerThreads = 1, //最小线程数
                MaxWorkerThreads = 10, //最大线程数
                AreThreadsBackground = true, //设置为后台线程
            }))
            {
                while (true)
                {
                    idleCount = smartThreadPool.MaxThreads - smartThreadPool.InUseThreads;//最大线程数 减去 正在执行的线程数 等于 空闲线程数

                    if (idleCount <= 0)
                    {
                        smartThreadPool.WaitForIdle(1000);
                        continue;
                    }

                    if (job.Count <= 0)//剩下任务数为0
                    {
                        if (smartThreadPool.IsIdle)//判断是否空闲
                            break;

                        smartThreadPool.WaitForIdle(1000);
                        continue;
                    }

                    if (job.Count > idleCount)
                        workingCount = idleCount;
                    else
                        workingCount = job.Count;

                    for (int i = 0; i < workingCount; i++)
                    {
                        queueWorkCount++;
                        smartThreadPool.QueueWorkItem(() =>
                        {
                            job.TryDequeue(out int result);
                            Thread.Sleep(_random.Next(10000));//模拟工作耗时
                        });
                    }

                    if (queueWorkCount > 10)//模拟拨号 
                    {
                        smartThreadPool.WaitForIdle();//等待所有任务执行完毕

                        // adsl拨号程序
                        Console.WriteLine("adsl");

                        Thread.Sleep(_random.Next(5000));//模拟拨号

                        queueWorkCount = 0;
                    }

                    smartThreadPool.WaitForIdle(1000);
                }
            }

            #endregion

            #endregion


            #region 投递所有任务

            using (smartThreadPool = new SmartThreadPool(new STPStartInfo
            {
                MinWorkerThreads = 1, //最小线程数
                MaxWorkerThreads = 10, //最大线程数
                AreThreadsBackground = true, //设置为后台线程
            }))
            {
                for (int i = 0; i < job.Count; i++)
                {
                    smartThreadPool.QueueWorkItem(() =>
                    {
                        job.TryDequeue(out int result);
                        Thread.Sleep(_random.Next(10000));//模拟工作耗时
                    });
                }

                smartThreadPool.WaitForIdle();//等待所有任务执行完毕
            }

            #endregion
        }

        private static string GetResultstring(string str, string str2)
        {
            string result = "";
            for (int i = 0; i < 20; i++)
            {
                System.Threading.Thread.Sleep(200);
                result += i + ",";
            }
            return str + str2 + result.TrimEnd(',');
        }

        private static object GetObjectString(object obj)
        {
            return string.Format("{0}{1}", (obj as string[])[0], (obj as string[])[1]);
        }

        private static double Diverse(double x, double y)
        {
            return x / y;
        }
    }

}