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Title: Event Source with lindorm.io alias App: Event Source alias MQ: RabbitMQ alias DB: Database order: Client, App, MQ, DB _: **Initialisation** App -> App: Create subscription for command note App,MQ:``` handler: (command) => { create_event("said_hello", command.data) } queue: "unique_command_queue" topic: "say_hello" ``` App -> App: Create subscription for saga note App,MQ:``` handler: (event) => { console.log(event.data.say) } queue: "unique_saga_queue" topic: "said_hello" ``` App -> App: Create subscription for view note App,MQ:``` handler: (event) => { set_state({ messages: [ event.data.say ] }) } queue: "unique_aggregate_queue" topic: "said_hello" ``` App -> MQ: Register subscription consumers _: **Runtime** Client -> MQ: Send Command note:``` id: "uuid" aggregate: "messages" name: "say_hello" data: { say: "hello" } ``` MQ --> Client: OK _: **Aggregate (source of truth)** MQ -> App: Command received note:``` topic: say_hello ``` App -> App: Run handler App -> App: Handler creating event note:``` id: event.id aggregate: "messages" causation: command.id name: "said_hello" data: event.data timestamp: now() ``` App -> DB: Store event DB --> App: OK App -> MQ: ACK command App -> MQ: Send Event _: **Saga (automation)** MQ -> App: [saga] Event received App -> App: Run handler App -> App: Handler logging: ```"hello"``` App -> DB: Store causation in saga list of causations App -> DB: Store new saga state DB --> App: OK App -> MQ: ACK event _: **View (projection)** MQ -> App: [view] Event received App -> App: Run handler App -> App: Handler changing view state App -> DB: Store causation in view list of causations App -> DB: Store new view state DB --> App: OK App -> MQ: ACK event