class ara::diag::DiagErrorDomain

The default constructor DiagErrorDomain() initializes an instance of the diagnostic error domain ara::diag::DiagErrorDomain ([SWS_DM_00520], AUTOSAR_AP_SWS_Diagnostics §8.11.3.2.1.1 “Default Constructor”). It is declared as constexpr and noexcept, takes no parameters, and returns no value ([SWS_DM_00520]). The call is synchronous and can be executed at compile time as well as at runtime.

Regarding execution safety and concurrency, the following properties apply:

• Error and exception safety: The function is specified as exception safe and cannot throw exceptions due to noexcept ([SWS_DM_00520]). Specific error codes or notifications to DET or DEM are not defined for construction.
• Thread safety: Instantiation is classified as thread-safe ([SWS_DM_00520]) and is subject to no restrictions regarding the call context.

In interaction with the Diagnostics module, class DiagErrorDomain ([SWS_DM_00517], AUTOSAR_AP_SWS_Diagnostics §8.11.3 “Class: DiagErrorDomain”) represents the domain of diagnostic errors. It provides central type aliases such as Errc ([SWS_DM_00518]) and Exception ([SWS_DM_00519]). Instances of the domain also provide methods for querying the name ([SWS_DM_00521]), for translating error codes into message texts via Message() ([SWS_DM_00522]), and for throwing domain-specific exceptions via ThrowAsException() ([SWS_DM_00523]).

In practical application, direct manual instantiation via this constructor is likely rarely necessary (interpretation), since a global instance reference is already available with function ara::diag::GetDiagDomain() ([SWS_DM_00524]), which is used, among other things, by ara::diag::MakeErrorCode() ([SWS_DM_00525]) to create error codes. Question Q-95d533b0920260e0 (open)

The method Message of class ara::diag::DiagErrorDomain serves the synchronous translation of a numerical error code into a readable text message ([SWS_DM_00522]). It overrides the base function of the error domain concept and is provided via header ara/diag/diag_error_domain.h ([SWS_DM_00522]).

Call Context and Semantics

As an input parameter, the function expects errorCode of type ara::core::ErrorDomain::CodeType ([SWS_DM_00522]). The return value is a pointer of type const char * to the corresponding error message ([SWS_DM_00522]). The specification bindingly guarantees that this return value is never nullptr ([SWS_DM_00522]). Interpretation: The returned string is likely to refer to static string literals, as the interface does not provide dynamic memory deallocation and must not fail. Question Q-a54b3a5f746357a8 (open)

Error Handling and Concurrency

Strict guarantees apply to execution regarding robustness and concurrency:

• Exception safety: The operation is declared as noexcept and specified as fully exception safe (exception safe) ([SWS_DM_00522]). It does not throw C++ exceptions in the event of an error.
• Thread safety: The function is explicitly classified as thread-safe ([SWS_DM_00522]). It can therefore be safely invoked in parallel by multiple threads without external synchronization mechanisms.

Interplay in the Diagnostic Module

The function is part of the unified error reporting in AUTOSAR Adaptive Diagnostic Management. Identical translation functions exist for other domain-specific error domains of the module:

• ara::diag::DiagUdsNrcErrorDomain::Message for text resolution of UDS NRCs ([SWS_DM_00534]),
• ara::diag::DiagOfferErrorDomain::Message for describing errors in diagnostic offers ([SWS_DM_00994]),
• ara::diag::DiagReportingErrorDomain::Message for resolving reporting error codes ([SWS_DM_01001]),
• ara::diag::DiagSovdErrorDomain::Message for SOVD-specific error codes ([SWS_DM_01814]).

The method ara::diag::DiagErrorDomain::Name serves the standardized retrieval of the identifier of the diagnostic error domain ([SWS_DM_00521]). It is provided via header ara/diag/diag_error_domain.h and synchronously returns the short name ApApplicationErrorDomain.SN as a null-terminated C-string of type const char * ([SWS_DM_00521]). The call takes place without input parameters. Interpretation: The returned pointer is likely to refer to a statically persisted string literal, since the specification does not provide any deallocation mechanisms. Question Q-1ca098627210deb0 (open)

With regard to error handling, the function is declared as noexcept and specified as exception safe ([SWS_DM_00521]). Neither error codes nor exceptions are reported; a call always yields a valid result.

Regarding concurrency and boundary conditions, the method is defined as thread-safe ([SWS_DM_00521]). Because it is stateless and qualified as const, it operates reentrantly and can be executed concurrently from arbitrary threads without external synchronization.

In the architectural interplay, the function aligns with Diagnostic Management (AUTOSAR_AP_SWS_Diagnostics p. 68). Similar Name methods for domain identification exist for the related classes ara::diag::DiagUdsNrcErrorDomain ([SWS_DM_00533]), ara::diag::DiagOfferErrorDomain ([SWS_DM_00993]), ara::diag::DiagReportingErrorDomain ([SWS_DM_01000]), and ara::diag::DiagSovdErrorDomain ([SWS_DM_01813]).

The member function ThrowAsException of class ara::diag::DiagErrorDomain serves to synchronously throw a C++ exception based on a passed error code ([SWS_DM_00523], AUTOSAR_AP_SWS_Diagnostics §8.11.3.2.2.3 “ThrowAsException”). The method expects a const reference to an instance of ara::core::ErrorCode as an input parameter and has no return value ([SWS_DM_00523]). Because the primary purpose is throwing an exception, the operation is declared with noexcept(false) and as not exception safe (not exception safe) ([SWS_DM_00523]).

Regarding concurrency, the method is specified as thread-safe (thread-safe) and can thus be called from multiple execution contexts without additional synchronization ([SWS_DM_00523]). An essential boundary condition concerns environments without exception support: According to [SWS_CORE_10304], the function does not participate in overload resolution if C++ exceptions are disabled in the compiler toolchain used ([SWS_DM_00523]).

This functional pattern is applied consistently across various error domains of the diagnostic module. Analogous implementations of ThrowAsException can be found, among others, in ara::diag::DiagUdsNrcErrorDomain ([SWS_DM_00535], AUTOSAR_AP_SWS_Diagnostics §8.12.3.2.2.3 “ThrowAsException”), ara::diag::DiagOfferErrorDomain ([SWS_DM_00995]), ara::diag::DiagReportingErrorDomain ([SWS_DM_01002]), and ara::diag::DiagSovdErrorDomain ([SWS_DM_01815]). Interpretation: Due to the specification with override, the method likely represents a common interface operation for polymorphic exception handling. Question Q-9c1e35e079af639d (open)