Request/Response

This unit manages asynchronous request tracking and timeout handling for middleware method and attribute-get flows.

It centralizes future-slot allocation, request identifiers, callback dispatch, and timeout state management.

Class Diagram

' ******************************************************************************* ' Copyright (c) 2026 BMW AG ' ' This program and the accompanying materials are made available under the ' terms of the Apache License Version 2.0 which is available at ' https://www.apache.org/licenses/LICENSE-2.0 ' ' SPDX-License-Identifier: Apache-2.0 ' ******************************************************************************* @startuml request_response title Request/Response - Class Diagram skinparam classFontSize 14 skinparam shadowing false left to right direction namespace middleware { namespace core <<domain>> { enum "Future::State" as FutureState { Invalid Pending Ready Timeout UserError ServiceBusy ServiceNotFound SerializationError DeserializationError CouldNotDeliverError } class Future <<value_object>> { callerTimestamp: uint32_t requestId: uint16_t state: FutureState } class ProxyMethodImpl { #obtainFuture(): Future* #futureMatchingRequestId(msg: Message): Future* #cancelRequest(requestId: uint16_t): HRESULT #freeAll() #updateTimeouts(timeout: uint32_t) } class ProxyMethod <<template>> { +callMethod(...): expected<uint16_t, HRESULT> +answerRequest(msg: Message) +cancelRequest(requestId: uint16_t): HRESULT +freeAll() +updateTimeouts() } } } ProxyMethodImpl *-- Future : manages pool of ProxyMethod --|> ProxyMethodImpl Future *-- FutureState @enduml