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synchronizer.go
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synchronizer.go
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package core
import (
"sync"
)
type Synchronizer struct {
out *Port
in *Port
queue chan int64
tasks map[int64]chan pullFunc
done map[int64]chan bool
mutex *sync.Mutex
counter int64
}
type pushFunc func(port *Port)
type pullFunc func(port *Port)
func (s *Synchronizer) Init(in, out *Port) {
s.in = in
s.out = out
s.queue = make(chan int64)
s.tasks = make(map[int64]chan pullFunc)
s.done = make(map[int64]chan bool)
s.mutex = &sync.Mutex{}
}
func (s *Synchronizer) Push(push pushFunc) int64 {
s.mutex.Lock()
s.counter++
token := s.counter
push(s.out)
s.tasks[token] = make(chan pullFunc)
s.done[token] = make(chan bool)
s.queue <- token // order is important! worker expects to have s.tasks[token] once it can pull the token from queue
s.mutex.Unlock()
return token
}
func (s *Synchronizer) Pull(token int64, pull pullFunc) {
s.tasks[token] <- pull
<-s.done[token]
delete(s.tasks, token)
delete(s.done, token)
}
func (s *Synchronizer) Worker() {
for {
token := <-s.queue
pull := <-s.tasks[token]
pull(s.in)
s.done[token] <- true
}
}