Add CDN asset prefetching and cache expiry#2306
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- Added a new document detailing the asset cache and prefetcher functionality, enhancing the understanding of CDN asset management. - Introduced `CdnAssetCache` and `CdnAssetPrefetcher` classes to manage asset caching and prefetching for improved performance during navigation. - Updated the `README.md` to include references to the new asset cache and prefetcher documentation. - Enhanced asset resolution logic to track usage and manage cache expiry effectively. - Implemented tests to validate the new caching and prefetching features, ensuring robust asset management.
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Description
Adds CDN asset caching improvements, next-screen asset prefetching, and automatic expiry for unused cached assets. Prefetching runs in the background, avoids current-screen assets, waits for foreground downloads, and does not mark prefetched assets as used until they are actually read by the app.
Related Issue
N/A
Type of Change
What Has Changed
CdnAssetPrefetcherfor bounded next-screen asset prefetching.CdnAssetCacheto trackdownloadedAtandlastUsedAt.lastUsedAt.doc/asset-cache-and-prefetcher.mdwith lifecycle diagrams and behavior notes.How to Test
modules/ensemble, run:flutter test test/cdn_asset_cache_test.dart test/cdn_asset_prefetcher_test.dartCdnAssetCache.lastUsedAt.Screenshots / Videos
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Checklist
flutter analyzeand addressed any new warningsflutter testand all tests pass