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csr tangled client in solid-js forked from ptr.pet/untangled
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1.7 kB · 67 lines
TypeScript
at main
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768interface AppviewCursorCheckpoint { matchingSeen: number; scannedSeen: number; cursor?: string; exhausted: boolean;}
const APPVIEW_CURSOR_CACHE_LIMIT = 64;const appviewPageCursorCache = new Map<string, Map<number, AppviewCursorCheckpoint>>();
export const clearAppviewStatefulCursorCache = () => { appviewPageCursorCache.clear();};
export const rememberAppviewCursorCheckpoint = (cacheKey: string, checkpoint: AppviewCursorCheckpoint) => { let checkpoints = appviewPageCursorCache.get(cacheKey); if (!checkpoints) { checkpoints = new Map(); appviewPageCursorCache.set(cacheKey, checkpoints); }
const existing = checkpoints.get(checkpoint.matchingSeen); if (!existing || checkpoint.scannedSeen >= existing.scannedSeen) { checkpoints.set(checkpoint.matchingSeen, checkpoint); }
while (checkpoints.size > APPVIEW_CURSOR_CACHE_LIMIT) { const first = checkpoints.keys().next().value; if (first === undefined) break; checkpoints.delete(first); }};
export const getNearestAppviewCursorCheckpoint = ( cacheKey: string, offset: number,): AppviewCursorCheckpoint => { const checkpoints = appviewPageCursorCache.get(cacheKey); const start: AppviewCursorCheckpoint = { matchingSeen: 0, scannedSeen: 0, exhausted: false, };
if (!checkpoints) { return start; }
let nearest = start; for (const checkpoint of checkpoints.values()) { if (checkpoint.matchingSeen > offset) { continue; }
if ( checkpoint.matchingSeen > nearest.matchingSeen || ( checkpoint.matchingSeen === nearest.matchingSeen && checkpoint.scannedSeen > nearest.scannedSeen ) ) { nearest = checkpoint; } }
return nearest;};