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Messaging

How do I handle duplicate command/event issues?

In the transport layer.

Should I use push or pull when publishing my events?

Push has the advantage that events can be pushed as they happen. Pull has the advantage that read sides can be more active and independent. Pull with a local event cache on the read side seems to us to be the nicest and most scalable solution. Push can work nicely with reactive programming and web sockets, however. Again, you needn't make the same choice everywhere in a system.

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