Go EventBus

Introduction

This package provides a simple yet powerful event bus.

• Simple Pub/Sub
• Async Publishing of events
• Wildcard Support

Documentation

https://pkg.go.dev/github.com/dtomasi/go-event-bus/v3

Installation

go get github.com/dtomasi/go-event-bus/v3

package main

import "github.com/dtomasi/go-event-bus/v3"

Usage

Simple

Subscribe and Publish events using a simple callback function

package main

import "github.com/dtomasi/go-event-bus/v3"

func main()  {

    // Create a new instance
    eb := eventbus.NewEventBus()

    // Subscribe to "foo:baz" - or use a wildcard like "foo:*"
    eb.SubscribeCallback("foo:baz", func(topic string, data interface{}) {
        println(topic)
        println(data)
    })

    // Publish data to topic
    eb.Publish("foo:baz", "bar")
}

Synchronous using Channels

Subscribe using a EventChannel

package main

import "github.com/dtomasi/go-event-bus/v3"

func main()  {

    // Create a new instance
    eb := eventbus.NewEventBus()

    // Subscribe to "foo:baz" - or use a wildcard like "foo:*"
	eventChannel := eb.Subscribe("foo:baz")

	// Subscribe with existing channel use
	// eb.SubscribeChannel("foo:*", eventChannel)

    // Wait for the incoming event on the channel
    go func() {
        evt :=<-eventChannel
        println(evt.Topic)
        println(evt.Data)

        // Tell eventbus that you are done
        // This is only needed for synchronous publishing
        evt.Done()
    }()

    // Publish data to topic
    eb.Publish("foo:baz", "bar")
}

Async

Publish asynchronously

package main

import "github.com/dtomasi/go-event-bus/v3"

func main()  {

    // Create a new instance
    eb := eventbus.NewEventBus()

	// Subscribe to "foo:baz" - or use a wildcard like "foo:*"
	eventChannel := eb.Subscribe("foo:baz")

	// Subscribe with existing channel use
	// eb.SubscribeChannel("foo:*", eventChannel)

    // Wait for the incoming event on the channel
    go func() {
        evt :=<-eventChannel
        println(evt.Topic)
        println(evt.Data)
    }()

    // Publish data to topic asynchronously
    eb.PublishAsync("foo:baz", "bar")
}