laravel_queues.md

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Laravel Queues	Vladimir Lelicanin - SAE Institute	revealjs theme title-slide-attributes transition footer margin auto-animate preview-links link-external-newwindow scrollable embed-resources slide-level chalkboard multiplex slide-number incremental logo default data-background-image data-background-position data-background-repeat data-background-size https://keystoneacademic-res.cloudinary.com/image/upload/f_auto/q_auto/g_auto/w_256/element/15/156456_sae.jpg top left no-repeat 100px fade Vladimir Lelicanin - SAE Institute Belgrade 0.2 true auto true true false 1 true true true false https://upload.wikimedia.org/wikipedia/commons/e/e2/SAE_Institute_Black_Logo.jpg

Introduction

• Asynchronous processing is important to improve the performance of an application
• Queuing is a method to execute time-consuming tasks later when the server is not busy
• Laravel Queues provides an easy and simple way to implement queuing in your application

---

Configuration

• Queues can be configured in the config/queue.php file
• Choose the queue driver that suits your application requirements (Sync, Database, Redis, Beanstalkd, Amazon SQS, etc.)
• Example configuration for the database driver:

'default' => env('QUEUE_CONNECTION', 'database'),

'connections' => [

    ...

    'database' => [
        'driver' => 'database',
        'table' => 'jobs',
        'queue' => 'default',
        'retry_after' => 90,
    ],

    ...
]

---

Creating Jobs

• Jobs are created using the make:job Artisan command
• Example command to create a job:

php artisan make:job MyJob

• Jobs are stored in the app/Jobs directory by default
• Example of a simple job:

<?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;

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

    /**
     * Execute the job.
     *
     * @return void
     */
    public function handle()
    {
        // Do some time-consuming task here
    }
}

---

Dispatching Jobs

• Jobs can be dispatched using the dispatch function
• Example:

MyJob::dispatch();

• Jobs can be dispatched with a delay using the delay method
• Example:

MyJob::dispatch()->delay(now()->addMinutes(5));

• Jobs can be dispatched to a specific queue using the onQueue method
• Example:

MyJob::dispatch()->onQueue('my-queue');

---

Running Workers

• Workers are processes that run continuously to process queued jobs
• Workers can be started using the queue:work Artisan command
• Example command to start a worker:

php artisan queue:work

• A supervisor can be used to manage your workers and ensure they are always running

---

Monitoring Queues

• Laravel provides several tools to monitor your queues and jobs
• queue:listen command can be used to monitor a queue

php artisan queue:listen

• The horizon package can be used to monitor and manage queues in a more advanced way -> link to the documentation: https://laravel.com/docs/queues#monitoring-queue-health-with-horizon

---

Retrying Failed Jobs

• Failed jobs can be automatically retried based on their configuration
• The retryAfter property on a job determines how long it should wait before retrying
• The tries property determines how many times a job should be retried
• Failed jobs can also be manually retried by calling the retry method on the job instance

---

Creating Custom Queue Drivers

• Laravel provides a simple way to create custom queue drivers
• Custom drivers can be included as a package, or in the App\Queues directory
• Custom drivers should implement the Illuminate\Contracts\Queue\Queue interface
• Example custom driver:

<?php

namespace App\Queue;

use Illuminate\Contracts\Queue\Queue as QueueContract;

class MyCustomQueue implements QueueContract
{
    // Implement the queue methods here
}

---

Scaling Workers

• Scaling workers is important to handle a large number of jobs and reduce processing time
• Increasing the number of workers will result in more jobs being processed concurrently
• Use a supervisor to manage multiple workers and control the queue processing

---

Conclusion

• Queues are an important method for asynchronous processing in Laravel applications
• Laravel Queues provides a simple and easy way to implement queuing
• Custom queue drivers can be created for specific use cases

---

References

• Laravel Queues Documentation: https://laravel.com/docs/queues
• Laravel Horizon Documentation: https://laravel.com/docs/horizon
• Laravel Supervisor Configuration: https://laravel.com/docs/queues#supervisor-configuration
• Laravel Queue Drivers Documentation: https://laravel.com/docs/queues#driver-prerequisites