tobi/delayed_job
Delayed Job
Delayed Job is a Ruby library that provides a database-backed system for asynchronous task processing. It enables the offloading of long-running or time-consuming operations to background workers by serializing method calls and their arguments into a relational database, ensuring that tasks persist across application restarts.
The system functions as a distributed priority task scheduler, where independent worker processes continuously poll the database for pending jobs. By integrating task creation directly into application database transactions, it guarantees that jobs are only queued when the associated business logic succeeds. This architecture allows for horizontal scaling by running multiple concurrent worker processes across different machines to handle high volumes of tasks.
Beyond basic execution, the library supports deferred scheduling and task prioritization, allowing critical operations to be processed before lower-priority background work. It also includes administrative tools for queue maintenance, providing the ability to clear, reset, or remove pending tasks to manage the state of the background processing system.
Features
- Background Job Queues - Provides a system for offloading long-running tasks to background workers by storing method calls and arguments in a relational database.
- Persistent Job Queue Libraries - Manages persistent task queues using existing database infrastructure to ensure reliable job execution and state recovery.
- Asynchronous Task Processing - Offloads time-consuming operations to background workers to maintain application responsiveness and improve user experience.
- Database-Backed Persistence - Persists job metadata and arguments in a relational database to ensure durability across application restarts.
- Polymorphic Serializers - Encapsulates complex method calls and object states into serialized formats for later reconstruction by background workers.
- Database-Refreshed Executions - Stores method calls in a queue for later execution with automatic database record refreshing to ensure jobs use current data.
- Background Worker Processes - Provides worker processes that monitor the database for pending tasks and execute them across multiple machines.
- Distributed Task Schedulers - Manages and executes background workloads across multiple worker processes with support for task prioritization and retries.
- Priority-Based Job Schedulers - Orders task execution using numeric priority columns to ensure critical operations are processed before lower-priority background work.
- Transactional Enqueueing - Integrates task creation into database transactions to guarantee jobs are only queued when associated business logic succeeds.
- Polling-Based Worker Execution - Uses a polling mechanism where worker processes continuously query the database to discover and execute pending tasks.
- Worker Scaling - Supports launching and adjusting multiple concurrent worker processes to handle high volumes of tasks at scale.
- Background Process Offloading - Offloads long-running tasks into a database table for background execution to keep the main application responsive.
- Asynchronous Task Processors - Executes deferred operations in Ruby applications by polling a database table for pending jobs and processing them sequentially.
- Background Processing - Scales application workloads by running multiple concurrent worker processes across different machines to handle high volumes of tasks.
- Background Task Schedulers - Allows saving method calls into a database for automatic execution by a background process without blocking the main thread.
- Recurring Task Schedulers - Triggers specific method calls or business logic at a later time or on a recurring basis without blocking the main thread.
Star history
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