TPL队列处理 [英] TPL Queue Processing

问题描述

我目前正在对AA的项目，我有一个需要排队等候处理一些工作，这里的要求：

I'm currently working on a a project and I have a need to queue some jobs for processing, here's the requirement:

1. 工作必须在同一时间内处理的有一个


2. 排队的项目必须能够被上

所以我想一个类似于：

Task<result> QueueJob(params here)
{
   /// Queue the job and somehow return a waitable task that will wait until the queued job has been executed and return the result.
}

我试过有一个后台运行的任务，只是拉项关闭队列并处理工作，但难的是从一个后台任务的方法得到。

I've tried having a background running task that just pulls items off a queue and processes the job, but the difficulty is getting from a background task to the method.

如果需要的话我可以去的只是请求完成回调在QueueJob路线方法，但它会是巨大的，如果我能得到一个透明的任务回来，让您等待进行处理（即使有之前的工作队列）的工作。

If need be I could go the route of just requesting a completion callback in the QueueJob method, but it'd be great if I could get a transparent Task back that allows you to wait on the job to be processed (even if there are jobs before it in the queue).

推荐答案

Func键< T> 不带任何参数，返回的工作由一个运行一个类型T的值你可以等待返回的任务中获得的结果。

Func<T> takes no parameters and returns a value of type T. The jobs are run one by one and you can wait on the returned task to get the result.

public class TaskQueue
{
    private Queue<Task> InnerTaskQueue;

    private bool IsJobRunning;

    public void Start()
    {
        Task.Factory.StartNew(() =>
        {
            while (true)
            {
                if (InnerTaskQueue.Count > 0 && !IsJobRunning)
                {
                     var task = InnerTaskQueue.Dequeue()
                     task.Start();
                     IsJobRunning = true;
                     task.ContinueWith(t => IsJobRunning = false);
                }
                else
                {
                     Thread.Sleep(1000);
                }
            }
        }
    }

    public Task<T> QueueJob(Func<T> job)
    {
        var task = new Task<T>(() => job());
        InnerTaskQueue.Enqueue(task);
        return task;
    }
}

这篇关于TPL队列处理的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！