c# - 使用 WCF 和 C# (F#) 收集类似散点的操作

Question

使用 WCF 和 C#(或 F#)实现类似 Gather-Scatter 操作的最佳方法是什么？

1. 假设我有 20 个节点(计算机)通过 WCF 连接。
2. 每个节点计算一个持续时间值并将该值发送到主节点。
3. 主节点取所有传入节点的最小值并将此信息发送回所有节点。

编辑:

结果代码:

open System.ServiceModel
open System.ServiceModel.Channels

let numberOfClients = 10

type IMyContractCallback =
  [<OperationContract>]
  abstract GetDuration: duration: float -> unit

[<ServiceContract(CallbackContract = typeof<IMyContractCallback>)>]
type IMyContract =
    [<OperationContract>]
    abstract SendDuration: duration: float -> unit

[<ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode = ConcurrencyMode.Reentrant)>]
type MyService () =

  let mutable totDuration = 1.
  let callbacks = System.Collections.Generic.Stack ()

  interface IMyContract with
    member o.SendDuration (duration) =
        totDuration <- min totDuration duration
        callbacks.Push (OperationContext.Current.GetCallbackChannel<IMyContractCallback>())
        printfn "N = %d" callbacks.Count
        if callbacks.Count = numberOfClients then
          for c in callbacks do c.GetDuration (totDuration)

  interface IMyContractCallback with
    member o.GetDuration (duration) = printfn "Minimum duration = %g" duration

let address = "net.pipe://localhost/aaa"

let service = MyService ()
let pipe = new NetNamedPipeBinding()

let host = new ServiceHost(service)
host.AddServiceEndpoint(typeof<IMyContract>, pipe, address) |> ignore
host.Open()

for i in 0 .. numberOfClients - 1 do
  let client1 = System.Threading.Thread (fun () ->
    let fact = new DuplexChannelFactory<IMyContract>(new InstanceContext(service), pipe, address)
    let ch = fact.CreateChannel()
    ch.SendDuration (0.4 + float i) )
  client1.Start()

Answer 1

您可以使用 WCF 轻松地做到这一点。在服务器将在计算最小值后触发的客户端节点上实现回调。

参见 WCF Callbacks; a beginners guide