Created
December 14, 2019 17:41
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#ChnGoTurns10
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package main | |
import ( | |
"fmt" | |
"sync" | |
"time" | |
) | |
type Subscriber func(int) | |
type PubSub struct { | |
ch chan int | |
Subscribers []Subscriber | |
subscriberMutex sync.RWMutex | |
} | |
func (p *PubSub) Publish(val int) { | |
p.ch <- val | |
fmt.Println("DEBUG: Publishing - ", val) | |
} | |
func (p *PubSub) Subscribe(s Subscriber) { | |
p.subscriberMutex.Lock() | |
p.Subscribers = append(p.Subscribers, s) | |
p.subscriberMutex.Unlock() | |
} | |
func NewPubSub() *PubSub { | |
var pubSub PubSub | |
pubSub.ch = make(chan int) | |
go func() { | |
for { | |
val := <-pubSub.ch | |
fmt.Println("DEBUG: Notifying subscribers - ", val) | |
pubSub.subscriberMutex.RLock() | |
for _, subscriber := range pubSub.Subscribers { | |
subscriber(val) | |
} | |
pubSub.subscriberMutex.RUnlock() | |
} | |
}() | |
return &pubSub | |
} | |
func main() { | |
p := NewPubSub() | |
p.Subscribe(func(val int) { | |
fmt.Println("Multiplier: ", val*10) | |
}) | |
go p.Publish(42) // Independent | |
// go p.Publish(52) | |
// go p.Publish(62) | |
for i := 1; i <= 10; i++ { | |
k := i | |
p.Subscribe(func(val int) { | |
fmt.Println("Adder: ", val+k) | |
}) | |
} | |
p.Publish(100) | |
time.Sleep(1 * time.Second) | |
} |
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