Event-Driven Architecture – Mediator Topology

• Is composed of 5 components:
• Initiating event – the event that starts the whole process. Sent to a queue.
• Event queue – where the event mediator receives the initiating events
• Event mediator – receives events and sends them to the event channels
• Event channels – the channels between the mediator and the event processors
• Event processors – process their events and acknowledge the event mediator
• Has one or more event mediators to manage and control the workflow, including errors.
• Products: Apache ODE and Camel, BPEL Process Managers, Spring Integration, Camunda, and Custom
• Pros: error handling, workflow, the possibility to restart, data consistency
• Cons: scalability, performance, fault tolerance, modeling the workflows, coupling