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"Adaptive Object-Model Architecture"




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 : Sunday Morning Tutorials (8:30 - 12:00) : Sunday : Requirements, Modeling, Architecture, and Design

Adaptive Object-Model Architecture

Pacific Salon 1
Sunday, 8:30, half day



Joseph Yoder, The Refactory, Inc.

Tutorial number: 8

How to Build Systems That Can Dynamically Adapt to Changing Requirements

Architectures that can dynamically adapt to changing requirement are sometimes called "reflective" or "meta" architectures. We call a particular kind of reflective architecture an "Adaptive Object-Model (AOM)" architecture. An Adaptive Object-Model is a system that represents classes, attributes, relationships, and behavior as metadata. It is a model based on instances rather than classes. Users change the metadata (object model) to reflect changes to the domain model. These changes modify the system's behavior. In other word, it stores its Object-Model in XML files or in a database and interprets it. Consequently, the object model is adaptive; when the descriptive information for the object model is changed, the system immediately reflects those changes. We have noticed that the architects of a system with Adaptive Object-Models often claim this is the best system they have ever created, and they brag about its flexibility, power, and eloquence. At the same time, many developers find them confusing and hard to work with. This is due in part because the developers do not understand the architecture. This tutorial will give a description of the Adaptive Object-Model architectural style and will make it easier for developers to understand and build systems that need to adapt to changing requirements.

Advanced: A good knowledge of object concepts is required. It would be useful if participants have a basic understanding of frameworks, though it is not necessary. A general understanding of the GOF patterns is required. An understanding of Analysis Patterns and Reflective Architectures can be helpful. Specifically we will be covering Composite, TypeObject, Properties, Strategy, Interpreter and the Builder Design Patterns along with the Party, Accountability and Observation Analysis Patterns.

Joseph Yoder, The Refactory, Inc.:  Joseph W. Yoder from The Refactory, Inc., has worked on the architecture, design and implementation of software projects dating back to 1985. These projects range from stand-alone to client-server applications, multi-tiered, databases, object-oriented, frameworks, human-computer interaction, collaborative environments, web-based, and domain-specific visual-languages. Joe is the author of over two-dozen published patterns and has been working with patterns for a long time, writing his first pattern paper in 1995. Recently Joseph's focus has been on how to build dynamic and adaptable systems and he has been providing analysis, design, and mentoring along with writing papers to reflect these experiences.