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#Messaging Patterns

Patterns for asynchronous communication.

#Key Patterns

#Queue-Based Load Leveling

Producers ──▶ Queue ──▶ Consumer (controlled rate)

#Publish-Subscribe

diagram
Publisher ──▶ Topic ──▶ Subscriber A
                   ──▶ Subscriber B
                   ──▶ Subscriber C

#Competing Consumers

diagram
Queue ──▶ Consumer 1
     ──▶ Consumer 2
     ──▶ Consumer 3

#Message Brokers

BrokerBest For
RabbitMQTraditional messaging
Apache KafkaEvent streaming
AWS SQSServerless queues
Redis StreamsLightweight streaming

#Event-Driven Architecture

Loading diagram...

#Idempotency

Handle duplicate messages:

python
1def process_message(message):
2    if already_processed(message.id):
3        return  # Skip duplicate
4    
5    do_work(message)
6    mark_processed(message.id)

#Dead Letter Queue

diagram
Main Queue ──▶ Consumer ──▶ Failed?
                              │
                              Yes
                              │
                              ▼
                          DLQ (investigate)

[!TIP] Pro Tip: Always implement idempotency for message handlers!