feat(cache): implement stale-while-revalidate in OptimisticCache (#776) - #819
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feat(cache): implement stale-while-revalidate in OptimisticCache (#776)#819ZacLou wants to merge 1 commit into
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…llar-split#776) - Add OptimisticCacheOptions with staleWhileRevalidateMs (default 0) - Add optional revalidate callback for background refresh - Return stale values immediately while triggering background revalidation - Prevent concurrent revalidations per key via in-flight tracking - Emit revalidateError events when background refresh fails - Add peek(), resolveTtl(), and enabledState to SimpleCache for SWR support - Add unit tests for stale detection, concurrency guard, and error emission Closes Stellar-split#776
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Adds stale-while-revalidate (SWR) support to
OptimisticCacheso UIs never block on a TTL boundary.Changes
OptimisticCacheOptions:staleWhileRevalidateMs— time window before expiry where a value is considered stale but still served (default0, i.e. disabled).revalidate— async callback invoked in the background to fetch a fresh value.get()hits a stale entry, the stale value is returned immediately.revalidateErrorevent is emitted; the caller is unaffected.src/cache.ts):peek(key)— read raw entry metadata without evicting or counting hits.resolveTtl(method)— return the configured TTL for a method prefix.enabledStategetter.test/optimisticCacheSwr.test.tscovers stale detection, non-stale skipping, disabled SWR, concurrency guard, error emission, and post-error staleness.Closes #776