Method prepare

packages/core/src/engine/engine.ts:171–195

* Initialization preparations * 1. Check if there are any missing versions, and supplement if there are any. * 2. Check whether there are unsynchronized changesets locally, and if so, perform necessary transforms to keep revision and snapshot aligned * 3. Each engine will be prepared when i

(checkVersion?: number)

   * checkVersion does not exist when instantiated
   */
  async prepare(checkVersion?: number) {
    try {
      await this.checkLocalDiffChanges(checkVersion);
      this.prepared = true;
    } catch (error) {
      Player.doTrigger(Events.app_error_logger, {
        error,
        metaData: {
          localPendingChangeset: this.bufferStorage.localPendingChangeset,
          opBuffer: this.bufferStorage.opBuffer,
        },
      });

      // clear the local cache to prevent the problem from happening again
      this.bufferStorage.clearLocalPendingChangeset();
      this.bufferStorage.clearOpBuffer();

      this.event.onError && this.event.onError({
        type: ErrorType.CollaError,
        code: ErrorCode.EngineCreateFailed,
        message: t(Strings.local_data_conflict),
        modalType: ModalType.Info
      });
    }
  }

  /**
   * Completed the version supplement of local resources, and can perform collaborative data synchronization operations