Technology · Ebook

xRegistry: A Universal Model for Metadata Registries

by Shriira Press

Modern systems are knit together by metadata: the schemas that describe a payload, the definitions that declare an event, the endpoints that say where a stream lives. xRegistry is a CNCF specification, born in the same Serverless Working Group that produced CloudEvents, that defines one abstract model and one REST API for all of it. Everything is a registry containing groups, holding resources, carrying versions, with the API and document format mirroring each other exactly. This book walks the model from the ground up: the problem and its origins, the four-level hierarchy and its attributes, the symmetric API and document forms, versioning and optimistic concurrency, defining custom registries, the standard schema, message, and endpoint registries, and putting it to work for discovery and code generation.

Contents

1. 1Preface
2. 2Chapter 1 — The Metadata Problem
3. 3Chapter 2 — The Abstract Model
4. 4Chapter 3 — The API and Document Symmetry
5. 5Chapter 4 — Versions, Defaults, and Concurrency
6. 6Chapter 5 — Defining Your Own Registry
7. 7Chapter 6 — The Standard Registries
8. 8Chapter 7 — xRegistry in Practice