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lift.go
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lift.go
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package urx
import "sync"
type liftedObservable struct {
source privObservable
op Operator
}
type liftedSubscriber struct {
source privSubscription
op Operator
events chan Notification
unsub chan interface{}
cMutex sync.RWMutex
uMutex sync.Mutex
unsubbed bool
hooks
}
func (lifted *liftedObservable) privSubscribe() (sub privSubscription) {
out := &liftedSubscriber{source: lifted.source.privSubscribe(), op: lifted.op, events: make(chan Notification), unsub: make(chan interface{})}
go out.pump()
sub = out
return
}
func (lifted *liftedObservable) Lift(op Operator) (obs privObservable) {
obs = &liftedObservable{source: lifted, op: op}
return
}
func (sub *liftedSubscriber) pump() {
defer close(sub.events)
for ev := range sub.source.Events() {
sub.op.Notify(sub, ev)
}
}
func (sub *liftedSubscriber) Events() <-chan Notification {
return sub.events
}
func (sub *liftedSubscriber) Unsubscribe() {
sub.uMutex.Lock()
if sub.unsubbed {
sub.uMutex.Unlock()
return
}
close(sub.unsub)
sub.unsubbed = true
sub.source.Unsubscribe()
sub.uMutex.Unlock()
sub.cMutex.Lock()
defer sub.cMutex.Unlock()
sub.callHooks()
}
func (sub *liftedSubscriber) IsSubscribed() bool {
return !sub.unsubbed && sub.source.IsSubscribed() && !sub.finished
}
func (sub *liftedSubscriber) Notify(not Notification) {
sub.cMutex.RLock()
select {
case sub.events <- not:
sub.cMutex.RUnlock()
if not.Type == OnComplete {
sub.Unsubscribe()
}
case <-sub.unsub:
sub.cMutex.RUnlock()
return
}
}