亚马逊AWS简单工作流服务SWF C#示例

Question

我想知道是否有AWS .NET SDK的SWF工作流程C#示例代码可用？

AWS论坛帖子：https://forums.aws.amazon.com/thread.jspa?threadID=122216&tstart=0

- Shawn

Answer 1

作为熟悉SWF的一部分，我最终编写了一个通用案例库，希望其他人也能使用。它被称为SimpleWorkflowFramework.NET，并作为开源项目在https://github.com/sdebnath/SimpleWorkflowFramework.NET上提供。它肯定需要很多帮助，如果您感兴趣，请直接参与！ :)

- Shawn

Answer 2

我开发了一个开源的.NET库- Guflow，用于编写Amazon SWF程序。以下是如何编写一个转码视频的工作流程：

[WorkflowDescription("1.0")]
public class TranscodeWorkflow : Workflow
{
  public TranscodeWorkflow()
  {
    //DownloadActivity is the startup activity and will be scheduled when workflow is started.
    ScheduleActivity<DownloadActivity>().OnFailure(Reschedule);

    //After DownloadActivity is completed TranscodeActivity activity will be scheduled.
    ScheduleActivity<TranscodeActivity>().AfterActivity<DownloadActivity>()
        .WithInput(a => new {InputFile = ParentResult(a).DownloadedFile, Format = "MP4"})

    ScheduleActivity<UploadToS3Activity>().AfterActivity<TranscodeActivity>()
        .WithInput(a => new {InputFile = ParentResult(a).TranscodedFile});

    ScheduleActivity<SendConfirmationActivity>().AfterActivity<UploadToS3Activity>();
  }
  private static dynamic ParentResult(IActivityItem a) => a.ParentActivity().Result();
}

在上面的例子中，为了清晰起见，我省略了任务路由。以下是创建活动的方法：

[ActivityDescription("1.0")]
public class DownloadActivity : Activity
{
  //It supports both sync/async method.
  [ActivityMethod]
  public async Task<Response> Execute(string input)
  {
      //simulate downloading of file
      await Task.Delay(10);
      return new Response() { DownloadedFile = "downloaded path", PollingQueue = PollingQueue.Download};
  }

  public class Response
  {
      public string DownloadedFile;
  }
}

为了清晰起见，我将省略其他活动的示例。Guflow受到文档, 教程和示例的支持。

- Gurmit Teotia