Method setMessageDeliverer

src/service/viewer-impl.js:733–760

@override

(deliverer, origin)

  /** @override */
  setMessageDeliverer(deliverer, origin) {
    if (this.messageDeliverer_) {
      throw new Error('message channel can only be initialized once');
    }
    if (origin == null) {
      throw new Error('message channel must have an origin');
    }
    dev().fine(TAG_, 'message channel established with origin: ', origin);
    this.messageDeliverer_ = deliverer;
    this.messagingOrigin_ = origin;
    this.messagingReadyResolver_(origin);

    if (this.messageQueue_.length > 0) {
      const queue = this.messageQueue_.slice(0);
      this.messageQueue_ = [];
      queue.forEach((message) => {
        const responsePromise = this.messageDeliverer_(
          message.eventType,
          message.data,
          message.awaitResponse
        );

        if (message.awaitResponse) {
          message.responseResolver(responsePromise);
        }
      });
    }
  }

  /** @override */
  maybeGetMessageDeliverer() {