Listeners

A simple Go project demonstrating concurrent message listeners with graceful shutdown.

---

🧩 What It Does

This project spawns multiple goroutines (“listeners”) that poll a shared message at different intervals using time.Ticker.
Each listener reads the message safely via mutex protection and can be stopped gracefully using channels and sync.WaitGroup.

---

🚀 Quick Start

Navigate to the project directory

cd listeners

Run directly

go run .

Or build and run

go build -o listeners main.go
./listeners

Expected Output

Message data from Pro plan listener: initial message
Message data from Pro plan listener: initial message
Message data from Base plan listener: initial message
Pro plan listener stopped!
Base plan listener stopped!

🗂️ Project Structure

File	Description
main.go	Creates message, starts two listeners (1s and 5s intervals), runs for 6 seconds, then stops them gracefully.
listener.go	Defines the Listener struct with Start() and Stop() methods for managing goroutines.
message.go	Defines the thread-safe Message struct with mutex-protected read access.

---

🧠 Key Concepts

• Goroutine Management — Uses sync.WaitGroup to track and wait for all listener goroutines to complete.
• Graceful Shutdown — Each listener stops cleanly via a Done channel signal.
• Thread Safety — Shared Message reads are protected by sync.Mutex.
• Idempotent Stop — Uses sync.Once to safely call Stop() multiple times without panics.

---

👨‍💻 Developer

GitHub: mr-naveenseven