14. Laravel Queues & Background Jobs: Redis Drivers, Horizon, Retries & Dead Letter Queues • PHP 8+ & Laravel 11/12: Enterprise Full-Stack AI Developer • Rishabh Ki Kaksha

PHP 8+ & Laravel 11/12: Enterprise Full-Stack AI Developer › 14. Laravel Queues & Background Jobs: Redis Drivers, Horizon, Retries & Dead Letter Queues

50 mins

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Course Syllabus

Module 1: Modern PHP 8.2/8.3 Internals, Type System & CLI

01. PHP 8.2/8.3 Evolution: JIT Compiler, Zend VM Internals & Strict Typing System 02. Control Flow, Pattern Matching with match(), First-Class Callables & Fiber Concurrency 03. Modern OOP PHP: Constructor Promotion, Readonly Classes, Traits, Enums & Attributes

Module 2: Dependency Management, Autoloading & Database Engineering

04. Composer Mastery: PSR-4 Autoloading, Custom Packages & Composer Scripts 05. PDO Database Layer: Prepared Statements, SQL Injection Defense & Transaction Savepoints 06. Memory Profiling, Garbage Collection (Zend GC) & OPcache Performance Tuning

Module 3: Laravel 11/12 Core Architecture & Service Container

07. Laravel 11/12 Architecture: Request Lifecycle, bootstrap/app.php & Service Providers 08. The Inversion of Control (IoC) Service Container & Automatic Dependency Injection 09. Middleware Pipeline, Custom Global Pipeline Handlers & Terminating Middleware 10. Advanced Routing, Route Model Binding & Rate Limiting (Throttle Middleware)

Module 4: Eloquent ORM Masterclass & High-Scale Database Systems

11. Eloquent ORM Internals: Active Record vs Data Mapper, Eager vs Lazy Loading (N+1 Problem) 12. Advanced Relationships: Polymorphic, Many-to-Many with Pivots & HasManyThrough 13. Query Scopes, Custom Eloquent Casts, Mutators/Accessors & Raw Query Optimizations

Module 5: High-Performance Queues, WebSockets & Security Architecture

14. Laravel Queues & Background Jobs: Redis Drivers, Horizon, Retries & Dead Letter Queues 15. Real-Time Event Broadcasting with Laravel Reverb, WebSockets & Echo 16. Authentication & API Security: Laravel Sanctum, Passport (OAuth2) & Policy Gates (RBAC) 17. Security Hardening: CSRF, XSS, Mass Assignment Protection & Encrypted Cookies

Module 6: Enterprise Full-Stack AI, Testing & Cloud Deployment

18. Testing Masterclass: Pest PHP, PHPUnit, Database Transactions & Mocking HTTP Calls 19. Enterprise Generative AI Integration: LLM Tool Calling, Vector Search & OpenAI/Claude APIs 20. Production Deployment: Laravel Octane (FrankenPHP/Swoole), PM2/Supervisor & Docker Deployments

Interactive Lesson Studio

# 14. Laravel Queues & Background Jobs: Redis Drivers, Horizon, Retries & Dead Letter Queues

> PHP 8+ & Laravel 11/12 Notes by Rishabh - Topic 14

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### 1. Asynchronous Job Processing Pipeline 📬

User request ko 200 OK return karke heavy processing (Email sending, AI embedding generation, PDF rendering) ko background Redis queue worker me push karna:

```php
class ProcessVideoEncodingJob implements ShouldQueue {
    use Queueable, SerializesModels;

public int $tries = 3;
    public int $backoff = 60; // Wait 60s before retry

public function handle(FFmpegService $ffmpeg): void {
        $ffmpeg->encode($this->videoPath);
    }

public function failed(?Throwable $exception): void {
        Log::critical("Video encoding permanently failed for: {$this->videoPath}");
    }
}
```

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### 2. Laravel Horizon (Dashboard for Redis Queues 📊)

Real-time throughput metrics, job runtime heatmaps, worker auto-balancing, and failed job retry management.

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### 3. Interview Ke 3 Sawal Is Topic Se

1. **Dead Letter Queue (Failed Jobs Table) kaise monitor hoti hai?** -> 3 retries exhaust hone par job `failed_jobs` table me log hoti hai jise `php artisan queue:retry all` se re-execute kiya ja sakta hai.
2. **`ShouldBeUnique` interface queue me kya ensure karti hai?** -> Duplicate jobs ko queue me simultaneously push hone se rokti hai using Redis locks.
3. **Job Chaining vs Job Batching me kya farak hai?** -> Chaining sequential execution karti hai (A ➔ B ➔ C); Batching parallel run karti hai with `then()`, `catch()`, `finally()` callbacks.

---
**Next Topic:** 15. Real-Time Event Broadcasting with Laravel Reverb, WebSockets & Echo

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CERTIFICATE OF COMPLETION

Rishabh Gehlot

PHP 8+ & Laravel 11 Master Track