抱歉内容有点长。我想使用
对于下面的所有实现,请假设以下变量:
TcpListener
来监听端口,在不同(后台)线程中处理由传入连接请求产生的重负载,并在准备好响应时将其发送回客户端。我已经阅读了许多 MSDN 上的代码和示例,针对服务器,我提出以下实现方法。对于下面的所有实现,请假设以下变量:
let sva = "127.0.0.1"
let dspt = 32000
let respondToQuery (ns_ : NetworkStream) (bta_ : byte array) : unit =
// DO HEAVY LIFTING
()
实现方式1(普通同步服务器;我对此MSDN页面中的代码进行了翻译)
let runSync () : unit =
printfn "Entering runSync ()"
let (laddr : IPAddress) = IPAddress.Parse sva
let (svr : TcpListener) = new TcpListener (laddr, dspt)
try
svr.Start ()
let (bta : byte array) = Array.zeroCreate<byte> imbs
while true do
printfn "Listening on port %d at %s" dspt sva
let (cl : TcpClient) = svr.AcceptTcpClient ()
let (ns : NetworkStream) = cl.GetStream ()
respondToQuery ns bta
cl.Close ()
svr.Stop ()
printfn "Exiting runSync () normally"
with
| excp ->
printfn "Error: %s" excp.Message
printfn "Exiting runSync () with error"
let runAsyncBE () : unit =
printfn "Entering runAsyncBE ()"
let (tcc : ManualResetEvent) = new ManualResetEvent (false)
let (bta : byte array) = Array.zeroCreate<byte> imbs
let datcc (ar2_ : IAsyncResult) : unit =
let tcpl2 = ar2_.AsyncState :?> TcpListener
let tcpc2 = tcpl2.EndAcceptTcpClient ar2_
let (ns2 : NetworkStream) = tcpc2.GetStream ()
respondToQuery ns2 bta
tcpc2.Close ()
tcc.Set () |> ignore
let rec dbatc (tcpl2_ : TcpListener) : unit =
tcc.Reset () |> ignore
printfn "Listening on port %d at %s" dspt sva
tcpl2_.BeginAcceptTcpClient (new AsyncCallback (datcc), tcpl2_) |> ignore
tcc.WaitOne () |> ignore
dbatc tcpl2_
let (laddr : IPAddress) = IPAddress.Parse sva
let (tcpl : TcpListener) = new TcpListener (laddr, dspt)
try
tcpl.Start ()
dbatc tcpl
printfn "Exiting try block"
printfn "Exiting runAsyncBE () normally"
with
| excp ->
printfn "Error: %s" excp.Message
printfn "Exiting runAsyncBE () with error"
let runAsyncA () : unit =
printfn "Entering runAsyncA ()"
let (laddr : IPAddress) = IPAddress.Parse sva
let (svr : TcpListener) = new TcpListener (laddr, dspt)
try
svr.Start ()
let (bta : byte array) = Array.zeroCreate<byte> imbs
while true do
printfn "Listening on port %d at %s" dspt sva
let (cl : TcpClient) = svr.AcceptTcpClient ()
let (ns : NetworkStream) = cl.GetStream ()
async {respondToQuery ns bta} |> Async.RunSynchronously
cl.Close ()
svr.Stop ()
printfn "Exiting runAsyncA () normally"
with
| excp ->
printfn "Error: %s" excp.Message
printfn "Exiting runAsyncA () with error"
根据我阅读的MSDN文档,我认为实现3
应该是最快的。但当我从多台机器上发送多个查询请求时,它们的操作速度都大致相同。这让我相信我一定做错了什么。
实现2
或实现3
是否是实现在后台执行重活并在完成后将响应返回给客户端,同时允许另一个客户端连接并在另一个后台线程中启动另一个任务的TcpListener
的“正确”方法?如果不是,请告诉我应该阅读哪些类(或教程)。
use client = client
替代try..finally
吗? - J D