Collaborative Research: EHS: Components and Aspects for Embedded Middleware

Hsieh-Klefstad摘要--本研究项目是基于对横切关注点（如实时行为和内存约束）的理解，交互，并可以在嵌入式中间件模块化。这个项目研究了如何结合基于组件和方面，面向软件工程的方法可以促进嵌入式应用和中间件的开发。 现有的分布式、实时和嵌入式（DRE）系统中间件的经验已经说明了通过以前的组件和方面方法实现可配置性的好处和局限性。 新模型支持组件级的方面定义和应用：方面通过新的组合形式构建，相反，方面在组件定义和互连级引入功能。实时可预测性约束通过模型对实时Java的支持来解决：组件和方面根据它们的上下文来适应实时关注。 该模型允许开发人员以新的方式管理复杂性：通过允许灵活的中间件配置;通过支持类似组件的封装和对方面的受控暴露;以及通过提供对中间件配置的合理类型检查。 新技术正在通过开发新的、模块化的、高度可配置的实时Java DRE中间件来验证。 来自这项研究的知识将推动嵌入式系统开发的进步，并使更有效的技术模块化的关注跨越应用程序和中间件的边界。 该项目的技术预计将特别适用于设计和构建嵌入式和实时软件系统，以及一般的软件系统。 组件系统和中间件在商业上都已经变得流行起来，这种技术应该能够实现并展示未来组件系统和中间件的发展。

Hsieh-Klefstad Abstract---------This research project is developing new software engineering principles,techniques, and programming technology based on an improved understandingof how crosscutting concerns, such as real-time behavior and memoryconstraints, interact and can be modularized within embedded middleware.This project investigates how a combined component-based andaspect-oriented software engineering approach can advance the developmentof embedded applications and middleware. Experience with existingmiddleware for distributed, real-time, and embedded (DRE) systems hasillustrated both the benefits and the limits of implementingconfigurability through previous approaches to components and aspects.The research goal is to achieve expressive power through anintegration of components and aspects. The new model supports aspectdefinition and application at the component level: aspects are constructedthrough new compositional forms, and conversely, aspects introducefunctionality at the level of component definitions and interconnections.Real-time predictability constraints are addressed through the model'ssupport for real-time Java: components and aspects adapt to real-timeconcerns according to their contexts. The model allows developers tomanage complexity in new ways: by allowing flexible middlewareconfiguration; by supporting both component-like encapsulation andcontrolled exposure to aspects; and by providing sound type checking ofmiddleware configurations. The new techniques are being validated throughthe development of new, modular, and highly configurable DRE middlewarefor real-time Java. The knowledge that comes from this research willdrive progress in embedded systems development and enable more effectivetechniques for modularizing concerns across application and middlewareboundaries. The project's technology is expected to be particularly useful for designing and building embedded and real-time software systems, as well as softwaresystems in general. Both component systems and middleware have becomepopular commercially; this technology should enable and demonstrate the evolution of future component systems and middleware.