Vertical and Horizontal Dependencies Sample Clauses

Vertical and Horizontal Dependencies. The concept of vertical and horizontal interfaces was first introduced by Xxxxxx [12]. The authors distinguish between two types of interfaces: the vertical interface between the application and the underlying platform, and the horizontal interface between applications (regardless of whether they are running on the same platform or not). A platform consists of components that provide function-independent services. It enables the hardware that runs the application and the required software to execute the applications independent of the hardware and according to the application’s requirements. On the technical level, the vertical interface is not clearly separated into software and hardware relations. However, the overall viewpoint of our work is the software point of view. Implying that we consider the hardware as a resource used by the software, we do not focus on hardware-specific aspects such as manufacturing technology or special-purpose hardware components. Examples of platforms from the software point of view are AUTOSAR [13] and the ARINC 653 [14] Integrated Modular Avionics standard. Applications are software components that provide system-level functions to end users or other applications and are not related to services provided by the platform. The vertical interfaces describe the safety-relevant relations between an application and a platform service. Platform services are typically developed for reuse, e.g., libraries, communication protocols, or operating systems. Platform developers do not know all future systems that a platform service will be a part of and they do not know in which way the service will be part of the application functionality. Therefore, it is impossible to perform a hazard and risk analysis for a standalone platform service. To overcome this challenge, we propose a vertical interface description according to [2] following a modular, contract-based approach for the specification of demands and guarantees to form a vertical safety interface. The demands describe the safety-related behavior of the platform as required for the safe execution of the application. Consequently, a demand is linked to a specific application. The guarantees, on the other hand, are linked to a specific platform and define the actual safety-related capabilities of the platform. Whether an application demand is satisfied by a service guarantee depends on the consumed service guarantees from other applications. Mitigation and arbitration are needed to re...
Sample 1
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Related to Vertical and Horizontal Dependencies

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