Read-through وwrite-through

في هذا الدرس

know the patterns where the cache layer loads and writes data itself.

الموضوعات المخطط لها

• Read-through: the caller asks the cache; the cache loads from the database on a miss (Caffeine LoadingCache, Spring @Cacheable behave like this).
• Write-through: a write goes to the cache and the database synchronously, in one operation.
• Benefit: one code path and a cache that is always up to date after writes.
• Failure: write-through is as slow as the slower store and needs a plan if one write fails; the two stores can diverge without a transaction.