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Fix "5. Concurrency at Scale" more complicated ward sample #9

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Fix "5. Concurrency at Scale" more complicated ward sample #9

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77 changes: 49 additions & 28 deletions concurrency-at-scale/healing-unhealthy-goroutines/fig-more-complicated-ward.go
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Original file line number Diff line number Diff line change
Expand Up @@ -110,34 +110,55 @@ func main() {
}()
return takeStream
}
//bridge := func(
// done <-chan interface{},
// chanStream <-chan <-chan interface{},
//) <-chan interface{} {
// valStream := make(chan interface{}) // <1>
// go func() {
// defer close(valStream)
// for { // <2>
// var stream <-chan interface{}
// select {
// case maybeStream, ok := <-chanStream:
// if ok == false {
// return
// }
// stream = maybeStream
// case <-done:
// return
// }
// for val := range orDone(done, stream) { // <3>
// select {
// case valStream <- val:
// case <-done:
// }
// }
// }
// }()
// return valStream
//}
orDone := func(done, c <-chan interface{}) <-chan interface{} {
valStream := make(chan interface{})
go func() {
defer close(valStream)
for {
select {
case <-done:
return
case v, ok := <-c:
if ok == false {
return
}
select {
case valStream <- v:
case <-done:
}
}
}
}()
return valStream
}
bridge := func(
done <-chan interface{},
chanStream <-chan <-chan interface{},
) <-chan interface{} {
valStream := make(chan interface{}) // <1>
go func() {
defer close(valStream)
for { // <2>
var stream <-chan interface{}
select {
case maybeStream, ok := <-chanStream:
if ok == false {
return
}
stream = maybeStream
case <-done:
return
}
for val := range orDone(done, stream) { // <3>
select {
case valStream <- val:
case <-done:
}
}
}
}()
return valStream
}
doWorkFn := func(
done <-chan interface{},
intList ...int,
Expand Down