Choreographed microservices talk to each other asynchronously, blindly broadcasting notifications into a service cloud. Those notifications are handled by whatever client services are interested. These systems eliminate many of the problems associated with orchestrated systems (which work more like synchronous function calls) and are typically much faster than orchestrated systems, but they have their own idiosyncrasies and implementation challenges.
Allen Holub explores the inherent problems in orchestrated systems and explains how choreography can solve those problems. Allen outlines three approaches to choreography: HTTP based, pub/sub messaging based, and brokerless swarming systems. He also details appropriate messaging architectures and frameworks and shares several practical examples. Finally, Allen explores event storming: one of the best approaches to designing choreographed systems.
Allen Holub (https://holub.com,
allenholub, allenholub.com) is an internationally recognized software architect and Agile-transformation consultant. He speaks internationally about these topics and agile-friendly implementation technology (like microservices) and architecture. He provides in-depth consulting and training in those areas. He excels at building highly functional Lean/Agile organizations and designing and building robust, highly scalable software suitable for agile environments. He’s worn every hat from CTO to grunt programmer, and is an expert-level programmer in many languages and platforms.
Allen is widely published. His works include 10 books, hundreds of articles in publications ranging from Dr. Dobb’s Journal to IBM DeveloperWorks), and video classes for agilitry.com (Agility with Allen), Pluralsight (Swift in Depth, Picturing Architecture, Object-Oriented Design), O’Reilly (Design Patterns in the Real World) and forthcoming on Lynda/LinkedIn.
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