我有OWIN服务器作为控制台应用程序的一部分。你可以在这里看到主要方法:
class Program
{
public static ManualResetEventSlim StopSwitch = new ManualResetEventSlim();
static void Main(string[] args)
{
Console.CancelKeyPress += (s, a) =>
{
a.Cancel = true;
StopSwitch.Set();
};
using (WebApp.Start<Startup>("http://+:8080/"))
{
Console.WriteLine("Server is running...");
Console.WriteLine("Press CTRL+C to stop it.");
StopSwitch.Wait();
Console.WriteLine("Server is stopping...");
}
Console.ReadKey();
Console.WriteLine("Server stopped. Press any key to close app...");
}
}
当请求的处理时间稍长并且用户按CTRL + C以停止应用程序时,请求处理立即停止并且不发送响应。是否有可能改变这种行为?我想拒绝所有新请求,但要等到当前正在处理的请求完成并在此之后停止服务器。
我最初的想法是创建OWIN中间件,它将跟踪当前正在处理的请求并推迟停止操作,直到完成所有操作。中间件还会在停止阶段将所有请求短路。但这个解决方案对我来说听起来并不好。
答案 0 :(得分:2)
我结束了中间件的建议方法:
public class ShutDownMiddleware
{
private readonly Func<IDictionary<string, object>, Task> next;
private static int requestCount = 0;
private static bool shutDownStateOn = false;
public static void ShutDown()
{
shutDownStateOn = true;
}
public static int GetRequestCount()
{
return requestCount;
}
public ShutDownMiddleware(Func<IDictionary<string, object>, Task> next)
{
this.next = next;
}
public async Task Invoke(IDictionary<string, object> environment)
{
if (shutDownStateOn)
{
environment["owin.ResponseStatusCode"] = HttpStatusCode.ServiceUnavailable;
return;
}
Interlocked.Increment(ref requestCount);
try
{
await next.Invoke(environment);
}
finally
{
Interlocked.Decrement(ref requestCount);
}
}
}
这是在管道中注册的第一个中间件,在程序的主要方法中我可以像这样使用它:
public class Program
{
public static ManualResetEventSlim StopSwitch = new ManualResetEventSlim();
static void Main(string[] args)
{
Console.CancelKeyPress += (s, a) =>
{
a.Cancel = true;
StopSwitch.Set();
};
using (WebApp.Start<Startup>("http://+:8080/"))
{
Console.WriteLine("Server is running...");
Console.WriteLine("Press CTRL+C to stop it.");
StopSwitch.Wait();
Console.WriteLine("Server is stopping...");
ShutDownMiddleware.ShutDown();
while (ShutDownMiddleware.GetRequestCount() != 0)
{
Thread.Sleep(TimeSpan.FromSeconds(1));
}
}
}
}
我也发现了这个:https://katanaproject.codeplex.com/workitem/281 他们正在谈论类似的方法。