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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 | 6x 6x 6x 6x 9x 9x 9x 2x 5x 10x 10x 12x 10x 2x 10x 6x | import { v4 as uuidv4 } from 'uuid';
/**
* The `LockManager` is a singleton class designed to help wait for required async
* promised operations to complete
* before the page is generated. It provides functionalities to create, delete, and wait
* for the release of locks.
* The locks are stored in a Map with a unique ID (either provided or auto-generated) as
* the key.
* The class provides an instance property to get the singleton instance of `LockManager`.
*/
class LockManager {
// Holds the single instance of LockManager.
private static _instance: LockManager;
// A Map to keep track of the active locks.
private locks: Map<string, boolean>;
/**
* Private constructor to prevent direct instantiation from outside.
* Initializes the locks Map.
*/
private constructor() {
this.locks = new Map();
}
/**
* Provides a way to access the single instance of the LockManager.
* If it doesn't exist, it creates one.
* @returns {LockManager} The single instance of LockManager.
*/
public static get instance() {
if (!LockManager._instance) {
LockManager._instance = new LockManager();
}
return LockManager._instance;
}
/**
* Creates a new lock.
* @param {string} [id] - An optional ID to use for the lock. If not provided, a UUID will be generated.
* @returns {string} The ID of the created lock.
*/
createLock(id?: string): string {
const lockId = id ?? uuidv4();
this.locks.set(lockId, true);
return lockId;
}
/**
* Deletes a lock by its ID.
* @param {string} lockId - The ID of the lock to be deleted.
*/
deleteLock(lockId: string): void {
this.locks.delete(lockId);
}
/**
* Deletes all locks, clearing the locks Map.
*/
deleteAllLocks(): void {
this.locks.clear();
}
/**
* Waits until all locks are released and then resolves.
* @returns {Promise<void>} A promise that resolves when all locks are released.
*/
waitForLockRelease(): Promise<void> {
return new Promise((resolve) => {
const checkLocks = () => {
if (this.locks.size === 0) {
resolve();
} else {
setTimeout(checkLocks, 100);
}
};
checkLocks();
});
}
}
// Export the singleton instance of LockManager.
export const { instance } = LockManager;
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