System Design Patterns: From Fundamentals to Real Systems
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Capstone - Caching the Product Catalog

1. How This Capstone Works

The previous five lessons introduced five patterns, and this capstone applies them together to a product page that appears to be one resource but combines five data types behind its URL. Each type has a different read and write profile and a different cost when its value is wrong, so each requires a separate caching decision. A flash sale will then test the complete set of choices under load.

At every "pause and decide" checkpoint, identify both the pattern and its correctness mechanism. That mechanism may be a TTL, invalidation, or both

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