MOA Terms

Terms

• Connects message Producers with message Consumers
• Handler: The logic of the consumer
• Command; Message that requests a change of state
• Event: Message that indicates something of interest (no change of state)
• Topic/Subscription: Special queues that allow inbound messages to be picked up by multiple interested parties
• Service Bus: An ESB platform
• Pipeline: A logic stream of messages that are related to each other
• Idempotent: Operation that, when repeated, will produce the same result
• Guaranteed delivery: Messages are stored and forwarded to ensure they are delivered
• At least once delivery: To achieve reliability, there may be occasions that messages are sent more than once
• Loosely Coupled: All communication is done via messages
• Platform Agnostic: Producer and Consumer may be on different platforms
• Asynchronous: Producer can continue work after sending messages to the Broker

Messaging = ICP (Inter-Process Communication) with clear boundaries