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Domain logic

Projections

Client

Events

Commands Queries

WalletId: 123Owner: StevenBalance: €1000

WalletCreatedEvent: Id: 123, Owner: Steven> Balance: €0

CashDepositedEvent: €1500> Balance: €1500

CashWithdrawnEvent: €500> Balance: €1000

CashWithdrawnEvent: €500> Balance: €500

CashDepositedEvent: €500> Balance: €1000

"Event" and “Message" are not the same thing!

Publ

ic A

PI

Commands

Route to single handlerUse consistent hashing

Return a result

Events

Distribute to all event handlersConsumers express ordering req’s

Return no resultCan be persisted

Can be a ‘source’ of agg. stateCan be used to build projections

Queries

Route with load balancingSometimes scatter/gather

Return a result

code

➢ “cf create-service”○○○

➢ “cf bind-service”○○

➢ “cf push”

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cf push | cf create-service | cf bind-service

Start with a Monolith

It’s easier to design & build

cf push | cf create-service | cf bind-service

Strangle the Monolithusing location transparency and adding services

cf push | cf create-service | cf bind-service

Separate into Microservicesmakes it easier to maintain and scale

$> cf create-service axon-server

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