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95 lines
3.8 KiB
95 lines
3.8 KiB
import { Db, MongoClient } from 'mongodb';
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import { CacheIndex, CacheValue } from './types';
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/**
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* Plugin cached connection handling class.
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* @version 3.1.0
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*/
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export declare class Cache {
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private store;
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private readonly emitter;
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constructor();
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/**
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* Handles creating a new connection from an url and caching if necessary
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* @param {object} options - Options to initialize the cache
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* @param {string} options.url - The url to cache
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* @param {string} options.cacheName - The name of the cache to use
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* @param {any} options.init - The connection options provided
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**/
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initialize(options: any): CacheIndex;
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/**
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* Search the cache for a space stored under an equivalent url.
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*
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* Just swapping parameters can cause two url to be deemed different when in fact they are not.
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* This method finds an url in the cache where another url could be stored even when they are not strictly equal
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* @param cacheName The name of the cache to search
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* @param url The mongodb url to compare
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* @return The similar url already in the cache
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*/
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findUri(cacheName: string, url: string): string;
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/**
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* Returns true if the cache has an entry matching the given index
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* @param cacheIndex The index to look for
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* @return Returns if the cache was found
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*/
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has(cacheIndex: CacheIndex): boolean;
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/**
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* Returns the contents of the cache in a given index
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* @param cacheIndex {object} The index to look for
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* @return {object} The cache contents or null if was not found
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*/
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get(cacheIndex: CacheIndex): CacheValue;
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/**
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* Sets the contents of the cache in a given index
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* @param cacheIndex The index to look for
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* @param value The value to set
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*/
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set(cacheIndex: CacheIndex, value: CacheValue): void;
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/**
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* Returns true if a given cache is resolving its associated connection
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* @param cacheIndex {object} The index to look for
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* @return Return true if the connection is not found yet
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*/
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isPending(cacheIndex: CacheIndex): boolean;
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/**
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* Return true if a given cache started resolving a connection for itself
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* @param cacheIndex {object} The index to look for
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* @return Return true if no instances have started creating a connection for this cache
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*/
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isOpening(cacheIndex: CacheIndex): boolean;
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/**
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* Sets the database and client for a given cache and resolves all instances waiting for it
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* @param cacheIndex {object} The index to look for
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* @param db The database used to store files
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* @param [client] The client used to open the connection or null if none is provided
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*/
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resolve(cacheIndex: CacheIndex, db: Db, client?: MongoClient): void;
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/**
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* Rejects all instances waiting for this connections
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* @param cacheIndex The index to look for
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* @param err The error thrown by the driver
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*/
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reject(cacheIndex: CacheIndex, error: any): void;
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/**
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* Allows waiting for a connection associated to a given cache
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* @param cacheIndex The index to look for
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* @return A promise that will resolve when the connection for this cache is created
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*/
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waitFor(cacheIndex: CacheIndex): Promise<CacheValue>;
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/**
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* Gives the number of connections created by all cache instances
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* @return {number} The number of created connections
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*/
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connections(): number;
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/**
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* Removes a cache entry.
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*
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* > If the cache hasn't resolved yet it will be rejected.
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* @param cacheIndex The index to look for
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*/
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remove(cacheIndex: CacheIndex): void;
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/**
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* Removes all entries in the cache and all listeners
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*/
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clear(): void;
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}
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