Two safety patterns: Safety Assertion and Safety Assertion Enforcer

E. Fernández, B. Hamid
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引用次数: 2

Abstract

Safety is the avoidance of unacceptable hazards, including threats to human lives, the environment, or to costly facilities. Safety constraints are expressed using assertions that define system states that should not occur because they may lead to mishaps. We present here two safety patterns. The Safety Assertion pattern describes the contents of an assertion that indicates a state of the system that must not happen. The Safety Assertion Enforcer pattern evaluates safety assertions when there is an incoming event that can change the state of the system and prevents the change if it violates an assertion. These patterns can be useful for designing or certifying safe systems.
两种安全模式:安全断言和安全断言强制器
安全是指避免不可接受的危险,包括对人类生命、环境或昂贵设施的威胁。安全约束是使用断言来表示的,这些断言定义了不应该出现的系统状态,因为它们可能导致意外。我们在这里提出了两种安全模式。安全断言模式描述了一个断言的内容,该断言指出了一定不能发生的系统状态。当有可能更改系统状态的传入事件时,安全断言强制器模式评估安全断言,并在违反断言时阻止更改。这些模式对于设计或认证安全系统非常有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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