Laravel is a very popular PHP framework that is popular for its simplicity, ease of use and powerful functionality. In Laravel, queue is a very useful function that can help developers solve problems such as high concurrency and large data volume. In this article, we will explore some basics of Laravel queues and how to use them.

1. What is Laravel queue

Laravel queue is a tool for processing asynchronous tasks. It can add tasks to the queue and then process these tasks asynchronously in the background without affecting the current request. Response time. Queues can be used to handle various tasks, such as sending emails, processing images, generating PDFs, etc.

The working principle of a queue is very simple: tasks are first put into the queue, and then the background process executes these tasks asynchronously. The queue in Laravel supports multiple queue drivers, such as Redis, RabbitMQ, Beanstalkd, etc. Developers can choose the queue driver that suits them according to their needs.

2. How to use Laravel queue

Using Laravel queue is very simple, just follow the following steps:

1. Configure queue driver

Configuring the queue driver in Laravel is very simple. You only need to open the config/queue.php file and configure the corresponding queue driver. For example, using Redis as a queue driver, you can configure it like this:

'connections'?=>?[
????'redis'?=>?[
????????'driver'?=>?'redis',
????????'connection'?=>?'default',
????????'queue'?=>?'default',
????????'retry_after'?=>?90,
????????'block_for'?=>?null,
????],
],

2. Create a task class

Creating a class for processing tasks is very simple, you only need to define a handle method . For example, we create a task class for sending emails:

<?php

namespace App\Jobs;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Mail;

class SendEmail implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    protected $user;

    /**
     * Create a new job instance.
     *
     * @param $user
     */
    public function __construct($user)
    {
        $this->user?=?$user;
????}

????/**
?????*?Execute?the?job.
?????*
?????*?@return?void
?????*/
????public?function?handle()
????{
????????Mail::to($this->user->email)->send(new?Welcome($this->user));
????}
}

3. Add the task to the queue

Adding the task to the queue is very simple, just use the dispatch method. For example, we can use it in the Controller like this:

use?App\Jobs\SendEmail;

public?function?index()
{
????$user?=?auth()->user();
????SendEmail::dispatch($user);

????return?view('welcome');
}

4. Start the queue process

After the task is added to the queue, the queue process needs to be started at the end. There are many ways to start the queue process. You can use Laravel's own Artisan command, or you can use third-party tools such as supervisor. For example, we use the Artisan command to start the queue process:

php?artisan?queue:work?--tries=3?--timeout=30

Through the above steps, we can use the Laravel queue to process asynchronous tasks.

3. Commonly used Laravel queue functions

There are many other useful functions in Laravel queue, such as:

1. Handling failed tasks

When a task execution fails, you can use the failed_jobs table of the queue to record the failed task. At the same time, we can also set the number of task attempts and timeout to prevent the task from always failing.

2. Concurrent processing tasks

Laravel queue supports concurrent processing tasks. Multiple processes can be started on the command line to process tasks at the same time to improve task processing efficiency.

3. Monitoring task status

Through Laravel Horizon, a third-party tool, you can easily monitor the status of tasks, queue length and other information, so that we can find problems in time and deal with them. .

4. Queue Grouping Processing

If you need to group tasks, you can add the task to the specified queue. For example, we add the above SendEmail task to the mail queue:

SendEmail::dispatch($user)->onQueue('mail');

When starting the queue process, you can specify which queues to process:

php?artisan?queue:work?--queue=mail

The above is some basic knowledge and usage of Laravel queue. As Laravel continues to develop, queues will become more and more powerful. I believe that by studying this article, everyone will have a deeper understanding of the use of Laravel queues and can better apply it to actual development.

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