struct <ExtendedDataRecord-Namespace>::<ExtendedDataRecordElementInterface>::<ExtendedDataRecordElement>ReadOutput

In the diagnostic module of the AUTOSAR Adaptive Platform, the structure serves as an encapsulation for the output arguments when reading an Extended Data Record element. It bundles the resulting diagnostic data of a read operation in a typed object that is passed from the providing interface to the calling diagnostic instance. The data structure is presumably populated with the determined values during the call and subsequently provided for further processing or transmission by value or move semantics. Question (open) As a pure data object without its own synchronization mechanisms, concurrent access requires external coordination by the participating components.

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Context

The data structure <ExtendedDataRecordElement>ReadOutput is part of the module diag within the AUTOSAR Adaptive Platform (release R25-11). It is assigned to the namespace <ExtendedDataRecord-Namespace>::<ExtendedDataRecordElementInterface> and syntactically declared as a C++ structure (struct <ExtendedDataRecordElement>ReadOutput {...};). According to the specification description, this structure serves as an encapsulation for the output arguments of a read operation (Structure wrapping the out arguments for a ReadOutput).

Within adaptive diagnostic management, Extended Data Records (EDR) undertake the task of providing additional manufacturer-specific or standardized diagnostic information, such as operating conditions, measured values, or status counters at the time of a fault entry. The structure <ExtendedDataRecordElement>ReadOutput acts as a dedicated data transfer object for the results of a query for such a record element. Instead of passing return values via multiple separate output parameters or pointers, the structure combines the resulting output data.

The primary interaction partners are the querying diagnostic instance (for example a diagnostic service or the runtime environment of ara::diag) and the application-side implementation of the interface <ExtendedDataRecordElementInterface>. Interpretation: The structure presumably serves primarily to bundle the return values of a read call on an interface for Extended Data Records in ara::diag in a type-safe manner and make them available for the further data flow. Question Q-0b74f3ccd5993cf3 (open) In this way, a clean interface separation between data provision and data processing is ensured.

Lifecycle

The structure <ExtendedDataRecordElement>ReadOutput is designed as a pure C++ data aggregate without its own business logic or state keeping. This yields distinct characteristics for creation, ownership, and destruction in the system.

The object is instantiated directly in the context of the read call to be executed. The providing component creates the instance on the stack or within an asynchronous processing context and assigns the determined output data to it. Interpretation: The lifetime of the instance is likely bound to the respective execution and return cycle of the read operation and ends after the evaluation of the contained data by the caller. Question Q-8df0c1a01d7b670d (open) There are no internal states and consequently no defined state transitions; after its initialization, the structure is in an immutable or purely passive read state.

Regarding ownership, the structure is typically passed to the caller by value or by means of move semantics. Ownership is thus transferred completely to the caller. Upon leaving scope, the memory is deterministically freed according to normal C++ destruction rules.

With respect to concurrency, <ExtendedDataRecordElement>ReadOutput contains no internal synchronization mechanisms, mutexes, or atomic operations. Should an instance be shared across threads or forwarded in asynchronous data pipelines, responsibility for thread-safe access lies entirely with the surrounding software components of the diagnostic system.

Usage Path

The typical usage path describes the sequence of steps when querying diagnostic data via the interface <ExtendedDataRecordElementInterface>:

First, a diagnostic service or an internal diagnostic function initiates a read query for a specific Extended Data Record element. This query addresses the read operation of the interface. Interpretation: In the usage path, the structure is presumably populated with the read values by the application or handler implementation and subsequently handed over for further processing. Question Q-14a94978fff8f96e (open) The implementation reads the current diagnostic information from the internal data sources and initializes an instance of <ExtendedDataRecordElement>ReadOutput with these values.

After initialization, the instance is returned to the calling diagnostic component. The caller accesses the data fields contained in the structure to validate, serialize, or prepare the values for the diagnostic response in accordance with the diagnostic protocol. As soon as the output data has been successfully processed or transferred to downstream memory areas, the usage of the structure ends and the object is discarded.