ProductPromotion
Logo

Go.Lang

made by https://0x3d.site

GitHub - asaskevich/EventBus: [Go] Lightweight eventbus with async compatibility for Go
[Go] Lightweight eventbus with async compatibility for Go - asaskevich/EventBus
Visit Site

GitHub - asaskevich/EventBus: [Go] Lightweight eventbus with async compatibility for Go

GitHub - asaskevich/EventBus: [Go] Lightweight eventbus with async compatibility for Go

EventBus

GoDoc Coverage Status Build Status

Package EventBus is the little and lightweight eventbus with async compatibility for GoLang.

Installation

Make sure that Go is installed on your computer. Type the following command in your terminal:

go get github.com/asaskevich/EventBus

After it the package is ready to use.

Import package in your project

Add following line in your *.go file:

import "github.com/asaskevich/EventBus"

If you unhappy to use long EventBus, you can do something like this:

import (
	evbus "github.com/asaskevich/EventBus"
)

Example

func calculator(a int, b int) {
	fmt.Printf("%d\n", a + b)
}

func main() {
	bus := EventBus.New();
	bus.Subscribe("main:calculator", calculator);
	bus.Publish("main:calculator", 20, 40);
	bus.Unsubscribe("main:calculator", calculator);
}

Implemented methods

  • New()
  • Subscribe()
  • SubscribeOnce()
  • HasCallback()
  • Unsubscribe()
  • Publish()
  • SubscribeAsync()
  • SubscribeOnceAsync()
  • WaitAsync()

New()

New returns new EventBus with empty handlers.

bus := EventBus.New();

Subscribe(topic string, fn interface{}) error

Subscribe to a topic. Returns error if fn is not a function.

func Handler() { ... }
...
bus.Subscribe("topic:handler", Handler)

SubscribeOnce(topic string, fn interface{}) error

Subscribe to a topic once. Handler will be removed after executing. Returns error if fn is not a function.

func HelloWorld() { ... }
...
bus.SubscribeOnce("topic:handler", HelloWorld)

Unsubscribe(topic string, fn interface{}) error

Remove callback defined for a topic. Returns error if there are no callbacks subscribed to the topic.

bus.Unsubscribe("topic:handler", HelloWord);

HasCallback(topic string) bool

Returns true if exists any callback subscribed to the topic.

Publish(topic string, args ...interface{})

Publish executes callback defined for a topic. Any additional argument will be transferred to the callback.

func Handler(str string) { ... }
...
bus.Subscribe("topic:handler", Handler)
...
bus.Publish("topic:handler", "Hello, World!");

SubscribeAsync(topic string, fn interface{}, transactional bool)

Subscribe to a topic with an asynchronous callback. Returns error if fn is not a function.

func slowCalculator(a, b int) {
	time.Sleep(3 * time.Second)
	fmt.Printf("%d\n", a + b)
}

bus := EventBus.New()
bus.SubscribeAsync("main:slow_calculator", slowCalculator, false)

bus.Publish("main:slow_calculator", 20, 60)

fmt.Println("start: do some stuff while waiting for a result")
fmt.Println("end: do some stuff while waiting for a result")

bus.WaitAsync() // wait for all async callbacks to complete

fmt.Println("do some stuff after waiting for result")

Transactional determines whether subsequent callbacks for a topic are run serially (true) or concurrently(false)

SubscribeOnceAsync(topic string, args ...interface{})

SubscribeOnceAsync works like SubscribeOnce except the callback to executed asynchronously

WaitAsync()

WaitAsync waits for all async callbacks to complete.

Cross Process Events

Works with two rpc services:

  • a client service to listen to remotely published events from a server
  • a server service to listen to client subscriptions

server.go

func main() {
    server := NewServer(":2010", "/_server_bus_", New())
    server.Start()
    // ...
    server.EventBus().Publish("main:calculator", 4, 6)
    // ...
    server.Stop()
}

client.go

func main() {
    client := NewClient(":2015", "/_client_bus_", New())
    client.Start()
    client.Subscribe("main:calculator", calculator, ":2010", "/_server_bus_")
    // ...
    client.Stop()
}

Notes

Documentation is available here: godoc.org. Full information about code coverage is also available here: EventBus on gocover.io.

Support

If you do have a contribution for the package feel free to put up a Pull Request or open Issue.

Special thanks to contributors

Articles
to learn more about the golang concepts.

Resources
which are currently available to browse on.

mail [email protected] to add your project or resources here ๐Ÿ”ฅ.

FAQ's
to know more about the topic.

mail [email protected] to add your project or resources here ๐Ÿ”ฅ.

Queries
or most google FAQ's about GoLang.

mail [email protected] to add more queries here ๐Ÿ”.

More Sites
to check out once you're finished browsing here.

0x3d
https://www.0x3d.site/
0x3d is designed for aggregating information.
NodeJS
https://nodejs.0x3d.site/
NodeJS Online Directory
Cross Platform
https://cross-platform.0x3d.site/
Cross Platform Online Directory
Open Source
https://open-source.0x3d.site/
Open Source Online Directory
Analytics
https://analytics.0x3d.site/
Analytics Online Directory
JavaScript
https://javascript.0x3d.site/
JavaScript Online Directory
GoLang
https://golang.0x3d.site/
GoLang Online Directory
Python
https://python.0x3d.site/
Python Online Directory
Swift
https://swift.0x3d.site/
Swift Online Directory
Rust
https://rust.0x3d.site/
Rust Online Directory
Scala
https://scala.0x3d.site/
Scala Online Directory
Ruby
https://ruby.0x3d.site/
Ruby Online Directory
Clojure
https://clojure.0x3d.site/
Clojure Online Directory
Elixir
https://elixir.0x3d.site/
Elixir Online Directory
Elm
https://elm.0x3d.site/
Elm Online Directory
Lua
https://lua.0x3d.site/
Lua Online Directory
C Programming
https://c-programming.0x3d.site/
C Programming Online Directory
C++ Programming
https://cpp-programming.0x3d.site/
C++ Programming Online Directory
R Programming
https://r-programming.0x3d.site/
R Programming Online Directory
Perl
https://perl.0x3d.site/
Perl Online Directory
Java
https://java.0x3d.site/
Java Online Directory
Kotlin
https://kotlin.0x3d.site/
Kotlin Online Directory
PHP
https://php.0x3d.site/
PHP Online Directory
React JS
https://react.0x3d.site/
React JS Online Directory
Angular
https://angular.0x3d.site/
Angular JS Online Directory