asp.net-mvc – 使用ASP.NET MVC 2 AsyncController实现长时间运

非常有趣的问题！实际上它似乎不是AsyncController的任务.异步控制器设计用于在服务器端长时间运行的单HTTP查询操作.当您使用异步操作时,这只能帮助您在某些长时间运行的操作期间释放ASP.Net工作线程,并允许在执行操作时提供其他请求.但从客户端来看,这并不重要,这是不是同步控制器吗？对于客户端,这只是单个HTTP请求.

您需要在应用程序中使用一些长时间运行的查询服务来重新设计.以下是控制器的示例,可以为此工作流提供服务：

public class LongOperationsController : Controller
{
    public ActionResult StartOperation(OperationData data)
    { 
        Guid operationId = Guid.NewGuid(); // unique identifier for your operation
        OperationsService.DoStartOperation(operationId,data); // service starts to perform operation using separate thread
        return new JsonResult(operationId); // operation id should be sent to client to allow progress monitoring
    }

    public ActionResult GetOperationStatus(Guid operationId) 
    {
        var status = OperationsService.GetStatus(operationId); // this method returns some object,that describes status of operation (e.g. progress,current task etc.)
        return new JsonResult(status); // returning it to client
    }

    public ActionResult GetOperationResult(Guid operationId)
    {
        var result = OperationsService.GetOperationResult(operationId); // this should throw exception if operation is not yet completed
        return new JsonResult(result);
    }

    public ActionResult ClearOperation(Guid operationId)
    {
        OperationsService.ClearOperationResult(operationId); // we should delete operation result if it was handled by client
        return true;
    }
}

这里是客户端代码,可以与此控制器进行交互：

var operationId;
function startOperation(data) {
    $.post('/LongOperations/StartOperation',data,function(response) {
        operationId = response; // store operationId
        startOperationMonitoring(); // start
    },'json');
}

function startOperationMonitoring() {
    // todo : periodically call updateOperationStatus() to check status at server-side
}

function updateOperationStatus() {
    // todo : get result of GetOperationStatus action from controller 
    // todo : if status is 'running',update progress bar with value from server,if 'completed' - stop operation monitoring and call finishOperation()
}

function finishOperation() {
    // todo : get result of GetOperationResult action from controller and update UI
    // todo : call ClearOperation action from controller to free resources
}

这是非常基本的概念,这里有一些错过的项目,但我希望你会得到主要的想法.还有,您如何设计该系统的组件,例如：

>为OperationsService使用单例,
或不;
>应该存储运算结果的位置和时间(DB？Cache？
会议)？;
>是否真的需要手动释放资源以及何时执行
客户端停止监视操作
(用户关闭浏览器)等

祝你好运！