RequestContextCacheService

This service is used to cache arbitrary data relative to an ongoing request. It does this by using a WeakMap bound to the current RequestContext, so the cached data is available for the duration of the request. Once the request completes, the cached data will be automatically garbage-collected.

This is useful for caching data which is expensive to compute and which is needed multiple times during the handling of a single request.

class RequestContextCacheService {    set(ctx: RequestContext, key: any, val: T) => void;    get(ctx: RequestContext, key: any) => T | undefined;    get(ctx: RequestContext, key: any, getDefault?: () => T) => T;    get(ctx: RequestContext, key: any, getDefault?: () => T) => T | Promise<T> | undefined;}