Event-Driven Architecture: (1 of 3)

• This architectural style is about decoupling.
• It works with events. Events are not requests, just announcements.
• Possible topologies: Broker and Mediator, or integrated into other architectural styles
• All communications are asynchronous (no responses)
• Increases the responsiveness (not the same as performance)
• Responsiveness is about fast feedback, and performance is about fast call
• Events errors are usually managed by a Workflow Processor (workflow delegate pattern)
• Data loss is a possibility. Good queueing practices are mandatory to avoid it.
• One of the great things is the implicit broadcast of a message
• Request-response is possible with 2 queues. (request & response), or a temporary queue
• Pros: high scalability, high performance, highly adaptable
• Cons: simplicity, cost, elasticity, deployability