@axiomify/jobs

A resilient, type-safe distributed queue and workflow coordination engine for Axiomify, featuring concurrent workers, auto-retry delays, SQL/Memory storage backends, Saga transactional orchestrators, and native Studio dashboard metrics integration.

Features

• Pluggable Storage Adapters: Built-in support for MemoryJobStorage, SQLJobStorage, and RedisJobStorage. Easily extensible to custom databases or cloud queues.
• Concurrent Queue Workers: Configurable max concurrency limits, lease lock timeouts, and polling loops.
• Resilient Auto-Retry Management: Automatic retry loops with customized backoff delays. Captures and persists error details and stack traces for debugging.
• Dead Letter Queue (DLQ): Automatically routes permanently failed tasks exceeding attempts to a designated queue namespace for offline inspection.
• Distributed Cron Locking: Coordinated scheduling via acquireCronLock locks (Redis SET NX PX), ensuring exactly one cluster worker fires cron intervals.
• Saga Transaction Coordinator: Orchestrates multi-step distributed operations, executing compensating rollback tasks in reverse order if any step fails.
• Studio Dashboard Console: Native metrics integration exposing active, pending, completed, and failed tasks, with detailed JSON payload inspection and stack trace logs view.

Installation

npm install @axiomify/jobs

Note: @axiomify/core is required as a peer dependency.

Usage

1. Registering the Jobs Module

Register the jobs module in your Axiomify container. The scheduler automatically starts processing loops on adapter start and terminates gracefully on app close.

import { Axiomify } from '@axiomify/core';
import { jobsModule } from '@axiomify/jobs';

const app = new Axiomify();

app.use(
  jobsModule({
    queue: 'default',
    storage: 'memory', // Use 'sql' for persistent environments
    maxConcurrency: 5,
    pollIntervalMs: 1000,
  }),
);

2. Registering and Enqueuing Tasks

Inject the jobs scheduler from the dependency container to register task handlers and enqueue background workloads.

const jobs = app.resolve('jobs');

// Register a task worker handler
jobs.register(
  'send-welcome-email',
  async (payload: { email: string; name: string }) => {
    console.log(`Sending email to ${payload.name}...`);
    // Async mail operation
  },
);

// Enqueue a background task
await jobs.enqueue(
  'send-welcome-email',
  {
    email: '[email protected]',
    name: 'John Doe',
  },
  {
    attempts: 3, // max attempts
    priority: 10,
  },
);

3. Saga Distributed Workflows

For multi-step distributed operations that span multiple microservices or tables, use the SagaCoordinator to chain steps together. If any step fails, the coordinator enqueues compensation jobs in reverse order.

import { SagaCoordinator } from '@axiomify/jobs';

const saga = new SagaCoordinator(jobs);

// Step 1: Reserve inventory
saga.addStep(
  'reserve-inventory',
  async (ctx) => {
    // Inventory reservation logic
    return { itemId: '123' };
  },
  async (ctx) => {
    // Rollback compensation: release inventory
    await jobs.enqueue('release-inventory', { itemId: '123' });
  },
);

// Step 2: Capture payment (this might throw)
saga.addStep(
  'charge-card',
  async (ctx) => {
    throw new Error('Insufficient funds');
  },
  async (ctx) => {
    // Rollback compensation: refund charge
    await jobs.enqueue('refund-card', { amount: 50 });
  },
);

// Execute the saga flow
const outcome = await saga.execute({ userId: 'user_99' });
console.log(outcome.success); // false
// Compensation 'release-inventory' is automatically enqueued!

API Reference

jobsModule(options: JobsModuleOptions)

Axiomify AppModule that:

• Instantiates the queue storage engine ('memory' | 'sql' | 'redis').
• Configures JobScheduler workers and registers it as a 'jobs' service in the container.
• Binds shutdown hooks to close background loops gracefully.

Key options options:

• queue: Queue namespace target (defaults to 'default').
• maxConcurrency: Maximum background tasks processed in parallel (default: 5).
• pollIntervalMs: Interval to check for pending jobs (default: 100 ms).
• lockDurationMs: Lease lock expiration time in ms (default: 30000 ms).
• dlqQueue: Queue to route permanently failed jobs to (default: ${queue}:dlq).

JobScheduler Class

Extends EventEmitter.

register<P = any>(name: string, handler: JobHandler<P>): this

Registers a worker function to execute tasks under the specified name with typed payload P. Returns the scheduler instance to support method chaining.

enqueue<P = any>(name: string, payload: P, options?: EnqueueOptions): Promise<string>

Queues a task for background processing.

• options.attempts: Maximum execution retries (default: 3).
• options.priority: Task sorting order (higher numbers run first).
• options.delayMs: Delay in milliseconds before executing the job.

schedule(pattern: string, name: string, payload?: any): void

Registers a recurring task or cron schedule. The pattern can be a numeric string interval in seconds (e.g., '60') or a standard 5-field cron expression (e.g., */5 * * * *).

start(): void

Starts the worker polling loops.

stop(): Promise<void>

Stops polling and waits for active jobs to finish executing.

Lifecycle Events

• start: Emitted when a job starts execution. Passes (job: Job).
• completed: Emitted when a job completes successfully. Passes (job: Job).
• retry: Emitted when a job fails and is rescheduled for retry. Passes (job: Job, error: Error).
• failed: Emitted when a job fails permanently. Passes (job: Job, error: Error).
• dlq: Emitted when a job is routed to the Dead Letter Queue. Passes (job: Job, error: Error).

SagaCoordinator Class

new SagaCoordinator(scheduler: JobScheduler)

Creates a new coordinator instance.

addStep(name: string, execute: StepExec, compensate: StepComp): void

Adds an action step and its matching compensation task to the workflow chain.

execute(initialPayload?: any): Promise<SagaResult>

Executes the workflow forwards. If a step throws, runs compensations for all preceding steps.

License

MIT