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Implementing Domain-Driven Design by Vaughn Vernon

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Reason Two: Lack of Technical Mechanisms

Eventual consistency requires the use of some kind of out-of-band processing capability, such as messaging, timers, or background threads. What if the project you are working on has no provision for any such mechanism? While most of us would consider that strange, I have faced that very limitation. With no messaging mechanism, no background timers, and no other home-grown threading capabilities, what could be done?

If we aren’t careful, this situation could lead us back toward designing large-cluster Aggregates. While that might make us feel as if we are adhering to the single transaction rule, as previously discussed it would also degrade performance and limit scalability. To avoid that, perhaps we could ...

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