package main
import (
"fmt"
)
func files(fs []string) <-chan string{
c := make(chan string, 1000) //带1000个缓冲的channel,1000个以内不会阻塞
go func(){
for _, f := range fs{
c <- f
}
close(c) //切片内所有文件发送完毕,关闭
}()
return c
}
func filterSize(in <-chan string) <-chan string{
c := make(chan string, 1000) //带1000个缓冲的channel,1000个以内不会阻塞
go func (){
for i := range in{
fmt.Println("filter size got:", i)
if i == "123.txt" || i == "456.txt"{
c <- i
}
}
close(c)
}()
return c
}
func main() {
fmt.Println("file filter service")
fs := []string{"123.txt","456.txt","789.txt","1222.txt"}
c := filterSize(files(fs))
for i := range c{ //阻塞main gorouting, 循环取channel中的数据,直到channel关闭
fmt.Println("main got:", i)
}
}
输出:
file filter service
filter size func got: 123.txt
filter size func got: 456.txt
filter size func got: 789.txt
filter size func got: 1222.txt
main got: 123.txt
main got: 456.txt
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