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pipe.go
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pipe.go
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package goob
import (
"context"
"sync"
)
// Event interface
type Event interface{}
// Events channel
type Events <-chan Event
// NewPipe instance.
// Pipe the Event via Write to Events. Events uses an internal buffer so it won't block Write.
func NewPipe(ctx context.Context) (Write func(Event), Events <-chan Event) {
events := make(chan Event)
lock := sync.Mutex{}
buf := []Event{} // using slice is faster than linked-list in general cases
wait := make(chan struct{}, 1)
write := func(e Event) {
lock.Lock()
defer lock.Unlock()
buf = append(buf, e)
if len(wait) == 0 {
select {
case <-ctx.Done():
return
case wait <- struct{}{}:
}
}
}
go func() {
defer close(events)
for {
lock.Lock()
section := buf
buf = []Event{}
lock.Unlock()
for _, e := range section {
select {
case <-ctx.Done():
return
case events <- e:
}
}
select {
case <-ctx.Done():
return
case <-wait:
}
}
}()
return write, events
}