code: public void unLoad(final String carrierMovementId, final String unlocode, final String trackingId) throws Exception {
  		UnLoadContext unLoadContext = new UnLoadContext(roleAssigner);
  		final CarrierMovement carrierMovement = findCarrierMovement(carrierMovementId);
  		final Location location = findLocation(unlocode);
  		Cargo cargo = cargoRepository.find(trackingId);
  		unLoadContext.arrived(carrierMovement, location, cargo);
  		// 发送消息给某个货物的客户
  		// sendSMS(cargo.getCustomer())
  		// send1
  		// send3
  		// send101
  	}
docs: 卸载