Method receiveMessage

src/service/viewer-impl.js:693–730

@override

(eventType, data, unusedAwaitResponse)

  /** @override */
  receiveMessage(eventType, data, unusedAwaitResponse) {
    if (eventType == 'visibilitychange') {
      this.setVisibilityState_(data['state']);
      return Promise.resolve();
    }
    if (eventType == 'broadcast') {
      this.broadcastObservable_.fire(
        /** @type {!JsonObject|undefined} */ (data)
      );
      return Promise.resolve();
    }
    const observable = this.messageObservables_[eventType];
    const responder = this.messageResponders_[eventType];

    // Queue the message if there are no handlers. Returns a pending promise to
    // be resolved once a handler/responder is registered.
    if (!observable && !responder) {
      this.receivedMessageQueue_[eventType] =
        this.receivedMessageQueue_[eventType] || [];
      if (
        this.receivedMessageQueue_[eventType].length >=
        RECEIVED_MESSAGE_QUEUE_MAX_LENGTH
      ) {
        return undefined;
      }
      const deferred = new Deferred();
      this.receivedMessageQueue_[eventType].push({data, deferred});
      return deferred.promise;
    }
    if (observable) {
      observable.fire(data);
    }
    if (responder) {
      return responder(data);
    } else if (observable) {
      return Promise.resolve();
    }
  }

  /** @override */
  setMessageDeliverer(deliverer, origin) {