Caching and Object Store Design
Choose temporary state and caching boundaries, configure coherent Mule cache access and sharing, and apply HTTP freshness, validation, invalidation and explicitly permitted stale reuse.
Design, describe, and differentiate between scenarios that use an OS or caching.
~7 min read · 11 practice questions
What the exam expects
- Choose a temporary object store, replaceable cache or long-term system of record.
- Configure meaningful keys, synchronized cache access and deliberate sharing boundaries.
- Calculate HTTP age and remaining freshness across intermediaries.
- Distinguish validation, invalidation and explicitly allowed stale reuse.
- Interpret request directives and response metadata within their documented scope.
An object store keeps keyed application values; a cache keeps reusable results; freshness permits HTTP reuse without validation; a validator checks a stored representation; invalidation removes or makes that representation unusable until validation (Custom-policy caching, HTTP caching). The HTTP rules below concern implementations of the cited RFCs; a Mule object store or Cache scope is not itself a promise to implement every HTTP cache directive.
Sources for this section (2)
Key facts
- Detail
- Object Store is suitable for temporary values; long-term history needs lifecycle and audit design.
- Detail
- Equivalent requests need the same generated key.
- Detail
- Same-strategy invalidation inside a synchronized Cache execution can block progress.
- Detail
- Common store name and global-sharing property require broader isolation review.
- Detail
- Current age includes corrected initial age and local residence.
- Detail
- min-fresh concerns future freshness; max-age concerns current age.
- Detail
- must-revalidate requires an error if stale content cannot be successfully validated.
- Detail
- Changed validators or length make the old GET response stale.
- Detail
- Error recovery and nonblocking revalidation have distinct conditions and bounded windows.
Sources for this section (6)
- Storage considerationsblogs.mulesoft.com (opens in a new tab)
- Caching strategydocs.mulesoft.com (opens in a new tab)
- Invalidationdocs.mulesoft.com (opens in a new tab)
- Custom-policy cachingdocs.mulesoft.com (opens in a new tab)
- HTTP cachingwww.rfc-editor.org (opens in a new tab)
- Stale extensionswww.rfc-editor.org (opens in a new tab)
- Why does an unknown Cache-Control extension not invalidate the entire field?
- When a request contains a cache directive, what does that establish about the same directive appearing in the response?
- When an HTTP response lacks Age, can that absence alone establish origin contact?
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