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59 lines
1.3 KiB
Go
Executable File
59 lines
1.3 KiB
Go
Executable File
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import "fmt"
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type Request struct {
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a, b int
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replyc chan int // reply channel inside the Request
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}
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type binOp func(a, b int) int
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func run(op binOp, req *Request) {
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req.replyc <- op(req.a, req.b)
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}
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func (r *Request) String() string {
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return fmt.Sprintf("%d+%d=%d", r.a, r.b, <-r.replyc)
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}
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func server(op binOp, service chan *Request, quit chan bool) {
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for {
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select {
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case req := <-service:
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go run(op, req)
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case <-quit:
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return // stop infinite loop
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}
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}
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}
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func startServer(op binOp) (service chan *Request, quit chan bool) {
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service = make(chan *Request)
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quit = make(chan bool)
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go server(op, service, quit)
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return service, quit
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}
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func main() {
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adder, quit := startServer(func(a, b int) int { return a + b })
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// make requests:
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req1 := &Request{3, 4, make(chan int)}
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req2 := &Request{150, 250, make(chan int)}
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// send requests on the service channel
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adder <- req1
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adder <- req2
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// ask for the results: ( method String() is called )
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fmt.Println(req1, req2)
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// shutdown server:
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quit <- true
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fmt.Print("done")
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}
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/* output:
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3+4=7 150+250=400
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done
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*/
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