Method get

lib/Cache.js:93–117

* Retrieves a cached value and lets registered `gotHandlers` observe the * result before the caller receives it. * @template T * @param {string} identifier the cache identifier * @param {Etag | null} etag the etag * @param {CallbackCache<T>} callback signals when the value is retrieved *

(identifier, etag, callback)

	 * @returns {void}
	 */
	get(identifier, etag, callback) {
		/** @type {GotHandler<T>[]} */
		const gotHandlers = [];
		this.hooks.get.callAsync(identifier, etag, gotHandlers, (err, result) => {
			if (err) {
				callback(makeWebpackError(err, class="st">"Cache.hooks.get"));
				return;
			}
			if (result === null) {
				result = undefined;
			}
			if (gotHandlers.length > 1) {
				const innerCallback = needCalls(gotHandlers.length, () =>
					callback(null, result)
				);
				for (const gotHandler of gotHandlers) {
					gotHandler(result, innerCallback);
				}
			} else if (gotHandlers.length === 1) {
				gotHandlers[0](result, () => callback(null, result));
			} else {
				callback(null, result);
			}
		});
	}

	/**
	 * Stores a cache entry for the identifier and etag through the registered