Azure Service Bus — Enterprise Messaging

Service Bus queues, topics, sessions, dead-letter queue a transactions.

Queue vs Topic

• Queue — point-to-point, FIFO s sessions
• Topic + Subscriptions — pub/sub, SQL-like filtry

Sessions — FIFO

Messages se stejným SessionId jsou zpracovány sekvenčně — garantovaný ordering.

Dead-Letter Queue

• Max delivery count exceeded
• TTL expired
• Filter evaluation exception

DLQ = error inbox pro async processing. Monitorujte!

Shrnutí

Service Bus = enterprise messaging. Sessions pro FIFO, transactions pro atomicitu.