Method apply

lib/cache/IdleFileCachePlugin.js:46–244

* Applies the plugin by registering its hooks on the compiler. * @param {Compiler} compiler the compiler instance * @returns {void}

(compiler)

	 * @returns {void}
	 */
	apply(compiler) {
		const strategy = this.strategy;
		const idleTimeout = this.idleTimeout;
		const idleTimeoutForInitialStore = Math.min(
			idleTimeout,
			this.idleTimeoutForInitialStore
		);
		const idleTimeoutAfterLargeChanges = this.idleTimeoutAfterLargeChanges;
		const resolvedPromise = Promise.resolve();

		let timeSpendInBuild = 0;
		let timeSpendInStore = 0;
		let avgTimeSpendInStore = 0;

		/** @type {Map<string | typeof BUILD_DEPENDENCIES_KEY, () => Promise<void | void[]>>} */
		const pendingIdleTasks = new Map();

		compiler.cache.hooks.store.tap(
			{ name: PLUGIN_NAME, stage: Cache.STAGE_DISK },
			(identifier, etag, data) => {
				pendingIdleTasks.set(identifier, () =>
					strategy.store(identifier, etag, data)
				);
			}
		);

		compiler.cache.hooks.get.tapPromise(
			{ name: PLUGIN_NAME, stage: Cache.STAGE_DISK },
			(identifier, etag, gotHandlers) => {
				const restore = () =>
					strategy.restore(identifier, etag).then((cacheEntry) => {
						if (cacheEntry === undefined) {
							gotHandlers.push((result, callback) => {
								if (result !== undefined) {
									pendingIdleTasks.set(identifier, () =>
										strategy.store(identifier, etag, result)
									);
								}
								callback();
							});
						} else {
							return cacheEntry;
						}
					});
				const pendingTask = pendingIdleTasks.get(identifier);
				if (pendingTask !== undefined) {
					pendingIdleTasks.delete(identifier);
					return pendingTask().then(restore);
				}
				return restore();
			}
		);

		compiler.cache.hooks.storeBuildDependencies.tap(
			{ name: PLUGIN_NAME, stage: Cache.STAGE_DISK },
			(dependencies) => {
				pendingIdleTasks.set(BUILD_DEPENDENCIES_KEY, () =>
					Promise.resolve().then(() =>