Method checkSnapshotValid

lib/FileSystemInfo.js:3061–3074

* Checks snapshot valid. * @param {Snapshot} snapshot the snapshot made * @param {CheckSnapshotValidCallback} callback callback function * @returns {void}

(snapshot, callback)

	 * @returns {void}
	 */
	checkSnapshotValid(snapshot, callback) {
		const cachedResult = this._snapshotCache.get(snapshot);
		if (cachedResult !== undefined) {
			this._statTestedSnapshotsCached++;
			if (typeof cachedResult === class="st">"boolean") {
				callback(null, cachedResult);
			} else {
				cachedResult.push(callback);
			}
			return;
		}
		this._statTestedSnapshotsNotCached++;
		this._checkSnapshotValidNoCache(snapshot, callback);
	}

	/**
	 * Check snapshot valid no cache.