46 lines
1.4 KiB
TypeScript
46 lines
1.4 KiB
TypeScript
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/**
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* In-memory LRU cache for streaming listing results.
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*
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* Keyed by a deterministic hash of query parameters so that repeat visits
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* to the same filter combination are instant (no network request).
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*/
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import type { PropertyFeature } from '@/types';
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import type { ParameterValues } from '@/components/FilterPanel';
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interface CacheEntry {
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features: PropertyFeature[];
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timestamp: number;
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}
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const cache = new Map<string, CacheEntry>();
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const MAX_ENTRIES = 5;
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export function makeCacheKey(params: ParameterValues): string {
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const sorted = Object.entries(params)
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.filter(([, v]) => v !== undefined && v !== null && v !== '')
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.sort(([a], [b]) => a.localeCompare(b))
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.map(([k, v]) => `${k}=${v instanceof Date ? v.toISOString() : v}`);
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return sorted.join('&');
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}
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export function getCached(params: ParameterValues): PropertyFeature[] | null {
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const key = makeCacheKey(params);
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const entry = cache.get(key);
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if (!entry) return null;
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return entry.features;
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}
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export function setCached(params: ParameterValues, features: PropertyFeature[]): void {
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const key = makeCacheKey(params);
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if (cache.size >= MAX_ENTRIES && !cache.has(key)) {
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// Evict oldest entry (first inserted)
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const oldest = cache.keys().next().value;
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if (oldest) cache.delete(oldest);
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}
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cache.set(key, { features, timestamp: Date.now() });
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}
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export function invalidateAll(): void {
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cache.clear();
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}
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