import { openPromise } from "./util/openPromise.js";

export class AsyncCondition {
  _waitPromise: Promise<void>;
  _resolveWaitPromise: () => void;
  constructor() {
    const op = openPromise<void>();
    this._waitPromise = op.promise;
    this._resolveWaitPromise = op.resolve;
  }

  wait(): Promise<void> {
    return this._waitPromise;
  }

  trigger(): void {
    this._resolveWaitPromise();
    const op = openPromise<void>();
    this._waitPromise = op.promise;
    this._resolveWaitPromise = op.resolve;
  }
}

export enum TransactionLevel {
  None = 0,
  Read = 1,
  Write = 2,
  VersionChange = 3,
}