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Message Queue Patterns

23. 06. 2025 1 min read intermediate

Architecture Intermediate

Message Queue Patterns

Message QueueRabbitMQAsync 3 min read

Design patterns for message queues. Work queues, dead letter queues and examples with RabbitMQ.

Work Queue

// Producer
ch.assertQueue('email-queue', { durable: true });
ch.sendToQueue('email-queue', Buffer.from(JSON.stringify({
    to: '[email protected]', subject: 'Potvrzení'
})), { persistent: true });

// Consumer
ch.prefetch(1);
ch.consume('email-queue', async (msg) => {
    await sendEmail(JSON.parse(msg.content.toString()));
    ch.ack(msg);
});

Dead Letter Queue

Messages after N failed attempts are moved to the DLQ for analysis.

ch.assertQueue('orders', {
    durable: true,
    arguments: {
        'x-dead-letter-exchange': 'dlx',
        'x-dead-letter-routing-key': 'dead-orders'
    }
});

Summary

Work queues for background jobs, pub/sub for events, DLQ for error handling. RabbitMQ for routing, Kafka for streaming.

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We build core systems and AI agents that keep operations running. 15 years of experience with enterprise IT.