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InfoQ Homepage Presentations Designing Events-First Microservices

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Designing Events-First Microservices

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Bio

Jonas Bonér is the founder and CTO of Lightbend, inventor of the Akka project, initiator and co-author of the Reactive Manifesto and a Java Champion.

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Recorded at:

Sep 13, 2018

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Community comments

  • Not my prefered appraoch

    by George Ludgate /

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    This approach is a little chaotic. An event is an instantaneous change in the static-state or dynamic-behavior of one or more things. Events are given generic class-names which are present-tense sentences e.g. "Man marries woman.", "CEO takes company public.". You CANNOT describe an event without describing the things which change - hence you have to be object oriented from the start. How will you know whether your system needs to respond to a particular event found during the analysis sessions e.g. "Customer buys item."? If Customers are not in your domain of interest then you would waste time handling this event. The object-oriented domain driven approach to analysis and design (OOS/OOD) promoted by Inwood and myself in the 80s is still the best way to go. Boner also seems to have ignored the fact that “mining facts” is the start of any object-oriented approach and every fact is represented by a sentence which expresses a relationship between one or more things so again his approach is a poor man’s start to OOA. Events are facts that are true at an instant in time and are used to determine the dynamic behavior of things in OOA. Fats which are true for long periods of time are used to determine the static-state of a domain and captured on object models or ERDs. So he is prompting domain driven OOA but does not say it out loud nor shows its systematic approaches.

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