How to implement message queue in Goroutine?

How to implement message queue in Goroutine? Use the make function to create an unbuffered channel. Use the operator to receive messages.

#How to implement message queue in Goroutine?

Introduction

Goroutines in Go are lightweight concurrency primitives that can be used to create parallel execution code. A message queue is a communication mechanism that allows Goroutines to send and receive messages asynchronously. This tutorial will introduce how to use channels to implement message queues in Go, and provide a practical case.

Implementing message queue

Channel in Go is a two-way communication pipe that can be used to transfer values ​​between Goroutines. To create a channel, you can use the make function. For example:

ch := make(chan int)

This code creates an unbuffered channel, which means it can only hold one value at a time.

Send a message

To send a message, use the channel's operator. For example:

ch <- 42

This code sends the value 42 to the channel.

Receive messages

To receive messages, use the channel's -> operator. For example:

msg := <-ch

This code will receive a value from the channel and store it in the msg variable.

Practical Case

Let us create a simple producer-consumer application, in which the producer Goroutine will send messages, and the consumer Goroutine will receive and process them these messages.

Producer code

package main

import "time"

func main() {
    ch := make(chan int)
    go func() {
        for i := 0; i < 10; i++ {
            ch <- i
            time.Sleep(time.Second)
        }
        close(ch)
    }()
}

Consumer code

package main

import "time"

func main() {
    ch := make(chan int)
    go func() {
        for {
            msg, ok := <-ch
            if !ok {
                break
            }
            time.Sleep(time.Second)
            println(msg)
        }
    }()
}

In this example, the producer sends one message every second into the channel, and the consumer will receive and process these messages from the channel at the same frequency.

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