How to use the rsocket-flowable.FlowableProcessor function in rsocket-flowable

type: FRAME_TYPES.REQUEST_N,
              };
              this._connection.sendOne(requestNFrame);
            }
            //critically, if n is 0 now, that's okay because we eagerly decremented it
            if (firstRequest && n >= 0) {
              firstRequest = false;
              //release the initial frame we received in frame form due to map operator
              subscriber.onNext(frame);
            }
          },
        });
      },
      MAX_REQUEST_N,
    );
    const framesToPayloads = new FlowableProcessor(payloads, frame =>
      this._deserializePayload(frame));
    this._receivers.set(streamId, framesToPayloads);

    this._requestHandler.requestChannel(framesToPayloads).subscribe({
      onComplete: () => this._sendStreamComplete(streamId),
      onError: error => this._sendStreamError(streamId, error.message),
      onNext: payload => this._sendStreamPayload(streamId, payload),
      onSubscribe: subscription => {
        this._subscriptions.set(streamId, subscription);
        subscription.request(frame.requestN);
      },
    });
  }