Jobs are created using 'php artisan make:job JobName'. Jobs implement ShouldQueue interface. Define handle() method for job logic. Jobs can be dispatched using dispatch() helper or Job::dispatch().
Job dispatch sends jobs to queue for processing. Can use dispatch() helper, Job::dispatch(), or DispatchesJobs trait. Supports delayed dispatch and customizing queue/connection.
Failed jobs are tracked in failed_jobs table. Handle failures using failed() method in job class. Can retry failed jobs using queue:retry command. Support custom failure handling.
Job batching processes multiple jobs as group using Bus::batch(). Track batch progress. Handle batch completion and failures. Support adding jobs to existing batch.
Unique jobs prevent duplicate processing using ShouldBeUnique interface. Define uniqueness criteria. Handle lock timeout. Support unique job queuing strategies.
Lifecycle hooks handle job events like preparing, processing, failed. Implement before/after processing logic. Support cleanup operations. Handle job cancellation.
Scale queues using multiple workers. Handle worker balancing. Implement auto-scaling. Monitor queue performance. Support horizontal scaling.
Plan for queue failures. Implement backup strategies. Handle recovery procedures. Support failover mechanisms. Monitor recovery process.
Queues allow deferring time-consuming tasks for background processing. Laravel supports various queue drivers (database, Redis, SQS, etc.). Queues improve application response time by handling heavy tasks asynchronously.
Queue workers are run using 'php artisan queue:work'. Can specify connection, queue name, and other options. Should be monitored using supervisor or similar process manager in production.
Job middleware intercept job processing. Define middleware in job's middleware() method. Can rate limit, throttle, or modify job behavior. Support global and per-job middleware.
Set job timeout using timeout property or through command. Handle timeout exceptions. Implement graceful shutdown. Support retry after timeout.
Monitor queue using Horizon or custom solutions. Track queue size, processing time. Set up alerts. Handle queue bottlenecks. Support queue metrics.
Configure supervisor to manage queue workers. Set up worker processes. Handle worker failures. Monitor worker status. Support automatic restart.
Queue connections are configured in config/queue.php. Define driver, connection parameters. Support multiple connections. Can set default connection. Handle queue priorities.
Rate limit jobs using middleware like RateLimited. Configure limits per minute/hour. Handle rate limit exceeded scenarios. Support custom rate limiting strategies.
Manage job dependencies using job chaining or custom logic. Handle dependent job failures. Support conditional job execution. Implement dependency resolution.
Prioritize jobs using multiple queues. Configure queue priorities. Handle high-priority job processing. Support dynamic prioritization. Monitor queue priorities.
Create robust error handling. Implement retry strategies. Handle permanent failures. Support error notification. Monitor error patterns.
Job chains execute jobs in sequence using Chain::with(). Later jobs run only if previous ones succeed. Can set chain catch callback for failure handling.
Job events track job lifecycle. Listen for job processed, failed events. Handle queue events in EventServiceProvider. Support custom event listeners.
Track job progress using batch processing or custom tracking. Update progress in database. Broadcast progress updates. Support progress monitoring interface.
Process jobs across multiple servers. Handle job distribution. Implement job coordination. Support distributed locks. Monitor distributed processing.
Version jobs for compatibility. Handle job upgrades. Support multiple versions. Implement version migration. Monitor version conflicts.
