atlas-consortia-jobq 0.1.4

Package to facilitate queueing of jobs using Redis

Atlas Consortia JobQ

Atlas Consortia JobQ is a high-performance, Redis-backed priority queue system designed for background task management.

Table of Contents

• Installation

• Quick Start

• Worker Management

• Method Reference

• Features

Installation

Install the package via pip:

pip install atlas-consortia-jobq

Note: Requires a running Redis instance. Refer to the Redis documentation for instructions on installing and running Redis

Quick Start

1. Initialize the Queue

from atlas_consortia_jobq import JobQueue

# Connect to your Redis instance
jq = JobQueue(
    redis_host='localhost',
    redis_port=6379,
    redis_db=0,
    redis_password=None
)

2. Enqueue a Job

Jobs require a function, an entity_id, and optional arguments.

• reference_id: A unique identifier generated for every specific job. This is created during the enqueing process and will be returned so the job may be referenced later.

• entity_id: The unique identifier of the resource being processed (e.g., a UUID). This prevents the same resource from being queued multiple times.

def my_task(arg1, keyword_arg="default"):
    print(f"Processing: {arg1}, {keyword_arg}")

reference_id = jq.enqueue(
    task_func=my_task,
    entity_id="unique_id_123",
    args=["value1"],
    kwargs={"keyword_arg": "value2"},
    priority=2
)

Worker Management

To process jobs, you must start worker subprocesses. This is typically done in a dedicated entry-point script.

from atlas_consortia_jobq import JobQueue

if __name__ == "__main__":
    jq = JobQueue(redis_host='localhost')
    
    # This call spawns 4 worker subprocesses
    jq.start_workers(num_workers=4)

Method Reference

enqueue(task_func, entity_id, args=None, kwargs=None, priority=1)

Adds a job to the queue.

• If the entity_id is already queued, it updates the priority if the new priority is higher.

• If the entity_id is currently being processed, it prevents duplicate enqueuing.

update_priority(identifier, new_priority)

Updates the priority of an existing job. The identifier can be a reference_id or an entity_id.

get_status(identifier)

Returns a dictionary containing the reference_id, position_in_queue, and priority. Here "identifier" can be either the reference_id or the entity_id.

get_queue_status()

Returns an overview of the entire queue, including total job counts and a breakdown by priority level.

Features

• Atomic Operations: Uses Lua scripting to ensure job enqueuing and popping are race-condition free.

• entity_id Deduplication: Prevents multiple jobs for the same entity_id from cluttering the queue.

• Priority Support: Supports three priority levels (1=Highest, 2=Medium, 3=Lowest).

• Automatic Cleanup: Manages metadata and "processing" states automatically upon job completion.