import "github.com/vardius/message-bus"
Package messagebus provides simple async message publisher
Code:
queueSize := 100
bus := messagebus.New(queueSize)
var wg sync.WaitGroup
wg.Add(2)
_ = bus.Subscribe("topic", func(v bool) {
defer wg.Done()
fmt.Println("s1", v)
})
_ = bus.Subscribe("topic", func(v bool) {
defer wg.Done()
fmt.Println("s2", v)
})
// Publish block only when the buffer of one of the subscribers is full.
// change the buffer size altering queueSize when creating new messagebus
bus.Publish("topic", true)
wg.Wait()
// Unordered output:
// s1 true
// s2 true
Output:
s1 true s2 true
Code:
queueSize := 2
subscribersAmount := 3
ch := make(chan int, queueSize)
defer close(ch)
bus := messagebus.New(queueSize)
for i := 0; i < subscribersAmount; i++ {
_ = bus.Subscribe("topic", func(i int, out chan<- int) { out <- i })
}
go func() {
for n := 0; n < queueSize; n++ {
bus.Publish("topic", n, ch)
}
}()
var sum = 0
for sum < (subscribersAmount * queueSize) {
select {
case <-ch:
sum++
}
}
fmt.Println(sum)
Output:
6
type MessageBus interface {
// Publish publishes arguments to the given topic subscribers
// Publish block only when the buffer of one of the subscribers is full.
Publish(topic string, args ...interface{})
// Close unsubscribe all handlers from given topic
Close(topic string)
// Subscribe subscribes to the given topic
Subscribe(topic string, fn interface{}) error
// Unsubscribe unsubscribe handler from the given topic
Unsubscribe(topic string, fn interface{}) error
}MessageBus implements publish/subscribe messaging paradigm
func New(handlerQueueSize int) MessageBus
New creates new MessageBus handlerQueueSize sets buffered channel length per subscriber
Package messagebus imports 3 packages (graph) and is imported by 4 packages. Updated 2020-07-02. Refresh now. Tools for package owners.