Signals

The signals a robust, dependency-free go library that provides simple, thin, and user-friendly pub-sub kind of in-process event system for your Go applications. It allows you to generate and emit signals (synchronously or asynchronously) as well as manage listeners.

100% test coverage

Installation

go get github.com/maniartech/signals

Usage

package main

import (
  "context"
  "fmt"
  "github.com/maniartech/signals"
)

var RecordCreated = signals.New[Record]()
var RecordUpdated = signals.New[Record]()
var RecordDeleted = signals.New[Record]()

func main() {

  // Add a listener to the RecordCreated signal
  RecordCreated.AddListener(func(ctx context.Context, record Record) {
    fmt.Println("Record created:", record)
  }, "key1") // <- Key is optional useful for removing the listener later

  // Add a listener to the RecordUpdated signal
  RecordUpdated.AddListener(func(ctx context.Context, record Record) {
    fmt.Println("Record updated:", record)
  })

  // Add a listener to the RecordDeleted signal
  RecordDeleted.AddListener(func(ctx context.Context, record Record) {
    fmt.Println("Record deleted:", record)
  })
  
  ctx := context.Background()

  // Emit the RecordCreated signal
  RecordCreated.Emit(ctx, Record{ID: 1, Name: "John"})

  // Emit the RecordUpdated signal
  RecordUpdated.Emit(ctx, Record{ID: 1, Name: "John Doe"})

  // Emit the RecordDeleted signal
  RecordDeleted.Emit(ctx, Record{ID: 1, Name: "John Doe"})
}

Documentation

License

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