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[Recipe] Prevent duplicate commands #8

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slashdotdash opened this issue Nov 28, 2019 · 0 comments
Open

[Recipe] Prevent duplicate commands #8

slashdotdash opened this issue Nov 28, 2019 · 0 comments

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@slashdotdash
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How to prevent duplicate commands from being executed by an aggregate.

Use a router middleware to record the identity of each successfully dispatched command and prevent duplicates. Record the causation_id for each event applied to an aggregate and reject commands that have already be seen (caused an event to be recorded).
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