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import { parseQuery } from './query.js';
import type { RouteRegistry } from './registry.js';
import type {
MatchResult,
ProviderCache,
ProviderContext,
ProviderOptions,
TRec,
UnknownProvider,
UnknownRoute,
} from './types.js';
/**
* A cache for route provider data with time-based expiration.
*
* Extends WeakMap to store provider results keyed by provider instances.
* Each provider has its own Map of cached entries keyed by params and query.
*
* @template T - The type of data returned by providers
*
* @example
* ```ts
* const cache = new RouteCache(route);
* const data = await cache.resolve(provider, context, { maxAge: 60000 });
* ```
*/
export class RouteCache extends WeakMap<UnknownProvider, ProviderCache> {
/**
* Creates a new RouteCache instance.
*
* @param route - The route this cache is associated with, used for default options
*/
constructor(private route: UnknownRoute) {
super();
}
/**
* Resolves a provider with caching support.
*
* If caching is enabled (maxAge > 0), checks for cached data first.
* Returns cached data if it exists and hasn't expired.
* Otherwise, calls the provider and caches the result.
*
* @template T - The type of data returned by the provider
* @param provider - The provider function to resolve
* @param context - The provider context containing params, query, and data
* @param options - Optional provider options including maxAge for caching
* @returns A promise that resolves to the provider's data
*
* @example
* ```ts
* const data = await cache.resolve(
* async (ctx) => await fetchUser(ctx.params.id),
* { params: { id: '123' }, query: {}, data: {} },
* { maxAge: 60000 }
* );
* ```
*/
public async resolve<T>(
provider: UnknownProvider,
context: ProviderContext<TRec, TRec, TRec>,
options?: ProviderOptions
): Promise<T> {
const maxAge = options?.maxAge ?? this.route.options?.maxAge;
if (!maxAge) return (await provider(context)) as T;
if (!this.has(provider)) {
this.set(provider, new Map());
}
const { params, query } = (anchor.get as (ctx: typeof context, silent: boolean) => typeof context)(context, true);
const key = JSON.stringify({ params, query });
const cache = this.get(provider)!;
const cached = cache.get(key);
if (cached && Date.now() - cached.timestamp <= maxAge) {
return cached.data as T;
}
const data = await provider(context);
if (data !== null && typeof data !== 'undefined') {
const scheduler = setTimeout(() => cache.delete(key), maxAge) as never as number;
cache.set(key, { data, timestamp: Date.now(), scheduler });
}
return data as T;
}
/**
* Invalidates a cached entry for a specific provider and context.
*
* Removes the cached data and clears any pending expiration timeout.
*
* @param provider - The provider whose cache should be invalidated
* @param context - The context identifying which cache entry to invalidate
*
* @example
* ```ts
* cache.invalidate(provider, { params: { id: '123' }, query: {}, data: {} });
* ```
*/
public invalidate(provider: UnknownProvider, context: ProviderContext<TRec, TRec, TRec>): void {
const { params, query } = (anchor.get as (ctx: typeof context, silent: boolean) => typeof context)(context, true);
const key = JSON.stringify({ params, query });
const cache = this.get(provider);
const cached = cache?.get(key);
if (cache && cached) {
cache.delete(key);
clearTimeout(cached.scheduler);
}
}
/**
* Deletes all cached entries for a provider.
*
* Clears all cached data and removes the provider from the cache.
*
* @param provider - The provider to delete from the cache
* @returns true if the provider was in the cache, false otherwise
*
* @example
* ```ts
* cache.delete(provider);
* ```
*/
public delete(provider: UnknownProvider): boolean {
this.clear(provider);
return super.delete(provider);
}
/**
* Clears all cached entries for a provider without removing the provider itself.
*
* @param provider - The provider whose cache should be cleared
*
* @example
* ```ts
* cache.clear(provider);
* ```
*/
public clear(provider: UnknownProvider): void {
this.get(provider)?.clear();
}
}
/**
* A cache for URL matching results with LRU (Least Recently Used) eviction.
*
* Caches parsed and matched route results to avoid repeated parsing and matching.
* Uses a Map with LRU behavior - accessed entries are moved to the end,
* and the oldest entry is evicted when the cache reaches maxSize.
*
* @example
* ```ts
* const cache = new URLCache(registry, 100);
* const match = cache.get(new URL('/users/123', baseUrl));
* ```
*/
export class URLCache {
private cache = new Map<string, MatchResult>();
/**
* Creates a new URLCache instance.
*
* @param registry - The route registry used for matching URLs
* @param maxSize - Maximum number of entries to cache (default: 100)
*/
constructor(
private registry: RouteRegistry,
private maxSize = 100
) {}
/**
* Gets a cached match result for a URL, or creates one if not cached.
*
* If the URL is cached, returns the cached result and updates its LRU position.
* Otherwise, parses the URL, matches it against the registry, and caches the result.
* Evicts the oldest entry if the cache is at capacity.
*
* @param url - The URL to match
* @returns The match result, or undefined if no match is found
*
* @example
* ```ts
* const match = cache.get(new URL('/users/123', baseUrl));
* if (match) {
* console.log(match.route, match.params);
* }
* ```
*/
public get(url: URL): MatchResult | undefined {
const cacheKey = url.href;
// Check cache first - return cached match if exists
const cached = this.cache.get(cacheKey);
if (cached) {
// LRU: Move to end by deleting and re-inserting
this.cache.delete(cacheKey);
this.cache.set(cacheKey, cached);
return cached;
}
// Not cached - parse, match, and create context
const query = parseQuery(url.search);
const pathname = url.pathname;
const match = this.registry.match(pathname) as MatchResult;
if (match) {
match.url = url;
match.query = query;
match.context = mutable({ params: match.params, query, data: {} });
// Evict oldest entry if at capacity
if (this.cache.size >= this.maxSize) {
const firstKey = this.cache.keys().next().value;
if (firstKey !== undefined) {
this.cache.delete(firstKey);
}
}
// Cache the complete match result
this.cache.set(cacheKey, match);
}
return match;
}
}
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