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Messages on the Outside, Messages on the Inside

In the classic paper Data on the Outside versus Data on the Inside Pat Helland argued that data within a service boundary should be treated differently than data residing outside of it.

Here, I shall argue that the same applies to messages. Inside a service boundary messages are tightly coupled to the corresponding data manipulations. Sometimes it is even possible to enforce total order of messages.

The moment the message crosses the service boundary, it enters the no man’s land where bad things happen. Messages get reordered, duplicated or even lost.

Join me in this talk to learn about some patterns you can use to get your messages safely to the other side.

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