® Aspect Programming, LLP The Future of Aspect Oriented Programming Dean Wampler Aspect Programming, LLP Copyright © 2003 Aspect Programming, LLP. All Rights Reserved. Aspect Programming, LLP The Future of Aspect Oriented Programming oWhat Is AOP? oThe Future of AOP What Will Software Look Like? oAOP Today Copyright © 2003 Aspect Programming, LLP. All Rights Reserved. Aspect Programming, LLP The Future of Aspect Oriented Programming oWhat Is AOP? oThe Future of AOP What Will Software Look Like? oAOP Today Copyright © 2003 Aspect Programming, LLP. All Rights Reserved. Aspect Programming, LLP What is AOP? oObject Oriented Programming Modularizes the Problem Domain, Design Space • Useful to manage complexity Copyright © 2003 Aspect Programming, LLP. All Rights Reserved. Aspect Programming, LLP What is AOP? oObject Oriented Programming One dominant decomposition Copyright © 2003 Aspect Programming, LLP. All Rights Reserved. Aspect Programming, LLP What is AOP? oAspect Oriented Programming – Why? Dominant decomposition scatters other modules Security Code Tangling Copyright © 2003 Aspect Programming, LLP. All Rights Reserved. Aspect Programming, LLP What is AOP? oAspect Oriented Programming – Why? • Concerns that don’t fit in the domain of the dominant decomposition get scattered » E.g., security, logging, persistence, … • Code from different concerns gets tangled into objects of the dominant decomposition Copyright © 2003 Aspect Programming, LLP. All Rights Reserved. Aspect Programming, LLP What is AOP? oAOP’s Goal: Restore Concern Modularity • Identify crosscutting concerns • Extract them as separate modules, called Aspects • Develop and maintain them independently • Weave the modules together during… » Build - to compose application » Runtime - to dynamically change behavior oAOP Modularizes Crosscutting Structure oOOP Modularizes Hierarchical Structure Copyright © 2003 Aspect Programming, LLP. All Rights Reserved. Aspect Programming, LLP What is AOP? oWeaving The process of combining aspect and object models to create the desired runtime behavior • Can happen at build time or dynamically during runtime • Depending on technology, what to weave specified programmatically or declaratively Weaving is a fundamentally new technology for application development and runtime modification Copyright © 2003 Aspect Programming, LLP. All Rights Reserved. Aspect Programming, LLP What is AOP? oAspect Oriented Programming Complements, rather than replaces OOP • Some concepts are better expressed as objects • Other concepts are better expressed as aspects Can even use AOP with procedural code • E.g., Univ. of BC project studying aspects in BSD Unix “C” source code. AOP adds another “dimension” of modularity to older approaches Copyright © 2003 Aspect Programming, LLP. All Rights Reserved.