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blog名称:SixSun的Blog
日志总数:152
评论数量:372
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建立时间:2004年12月13日 |
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 [设计模式]AspectJ重构23 个GoF 模式
所见所闻, 软件技术
SixSun 发表于 2006/12/18 16:16:54 |
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[Introduction] [GoF Patterns in Java and AspectJ] [Downloads] [Publications] [Contact] [Jan Hannemann] [The SPL lab at UBC]
04/2004: update: minor changes to pattern code base
Aspect-Oriented Design Pattern Implementations
Language-dependence of Design Patterns
Introduction
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Software design patterns offer flexible solutions to common software development problems. Each pattern is comprised of a number of parts, including purpose/intent, applicability, structure, and sample implementations. A number of patterns involve crosscutting structures in the relationship between roles in the pattern and classes in each instance of the pattern.
When the software design patterns were first identified, the sample implementations were geared to the current state of the art in object-oriented languages. Since then, aspect-oriented programming has been proposed as a means of modularizing crosscutting concerns in software. Other work has shown that the implementation language affects pattern implementation, which makes it natural to explore the effect of aspect-oriented programming techniques on the implementation of the GoF patterns.
GoF Design Patterns in Java and AspectJ
[top]
As an initial experiment we chose to develop and compare Java and AspectJ implementations of the 23 GoF patterns. AspectJ is a seamless aspect-oriented extension to Java, which means that programming in AspectJ is effectively programming in Java plus aspects. By focusing on the GoF patterns, we are keeping the purpose, intent, and applicability of 23 well-known patterns, and only allowing the solution structure and solution implementation to change. So we are not discovering new patterns, but simply working out how implementations of the GoF patterns can be handled using a new implementation tool.
For the 23 patterns, we managed to remove the code-level dependencies from the participants in 17 cases. For 12 of these, we developed reusable implementations that can be integrated into software systems as "library pattern aspects". The examples illustrate differences in Java and AspectJ implementations
Our results indicate that using AspectJ improves the implementation of many GoF patterns. In some cases this is reflected in a new solution structure with fewer or different participants; in other cases, the only the implementation of the classes in the originally proposed solution changes (for example by moving pattern code from the participants into an aspect) .
Downloads
[top]
The following downloads are available. You will need to have Java (version 1.2 or higher) and AspectJ (version 1.1 or higher) installed to run the examples. Please refer to the readme files for details on running the examples:
[new] - A collection of Java and AspectJ implementations of the 23 GoF patterns, version 1.11 - Each design pattern is represented by a sample system implemented in both Java and AspectJ. This includes the library of 12 reusable pattern aspects. The example code is intentionally kept simple. Note that while all classes are extensively commented using ajdoc, ajdoc does not work with latest AspectJ versions. The AspectJ team has an updated ajdoc in the works and we will provide HTML documentations of the implementations when it becomes available.
Code base from April 01, 2004 [ZIP, 355K] - please refer to the readme files in the /docs directory for details on setting up your system, and compiling and running the examples.
Release notes [TXT, 3K]
Old pattern implementations, version 1.1 - basically the same as version 1.11 above, except for the Observer, FactoryMethod and Facade implementations.
Code base from February 25, 2004 [ZIP, 347 K]
Old pattern implementations, version 1.0 - based on an older version of AspectJ (1.0.6). We recommend you use the latest version instead (see above).
Code base from November 25, 2002 [ZIP, 321 K]
Pre-generated ajdoc documentation for this code base [ZIP, 697 K]
Publications
[top]
The following publications about Patterns in AOP are available so far:
Hannemann and Kiczales. Design Pattern Implementation in Java and AspectJ, Proceedings of the 17th Annual ACM conference on Object-Oriented Programming, Systems, Languages, and Applications (OOPSLA), pages 161-173, November 2002.
Contact
[top]
This project is part of the Ph.D. research of Jan Hannemann, under the supervision of Gregor Kiczales and Gail Murphy at in the Software Practices Lab, Department of Computer Science, University of British Columbia, Canada.
We are very interested to hear your feedback on this work. Please send all questions, comments and suggestions to:
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Last updated: April 01, 2004 by Jan Hannemann |
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回复:AspectJ重构23 个GoF 模式
所见所闻, 软件技术
1221(游客)发表评论于2009/3/18 16:19:50 |
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回复:AspectJ重构23 个GoF 模式
所见所闻, 软件技术
1221(游客)发表评论于2009/3/18 16:19:18 |
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回复:AspectJ重构23 个GoF 模式
所见所闻, 软件技术
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回复:AspectJ重构23 个GoF 模式
所见所闻, 软件技术
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