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Scalability Rules: Principles for Scaling Web Sites, Second Edition by Michael T. Fisher, Martin L. Abbott

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11. Asynchronous Communication and Message Buses

We met Chris Schremser and his company, ZirMed, a revenue cycle management company, in Chapter 3, “Design to Scale Out Horizontally.” We now revisit Chris to hear about another lesson that he and his team learned about asynchronous communication. Chris began, “We process healthcare transactions between parties—healthcare providers and payers. There are really two implementations of that. One is, the day before a patient arrives for a scheduled visit, a physician’s office will upload a whole big bunch of patient [records] and make sure that they have the current insurance on file, and they understand whether there are copays or things like that. The second implementation is, as a patient who wasn’t ...

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