33,653 research outputs found
Improving design and implementation of OO container-like component libraries
Object-oriented design is usually driven by three main reusability
principles: step-by-step design, design for reuse and design with reuse.
However, these principles tend to be just partially applied to the
subsequent object-oriented implementation, often because they conflict
with other quality criteria (remarkably, efficiency). So, there is a gap
between design and implementation: due to these conflicts developers use
to give up design level abstractions during the implementation. In this
paper we present a framework for bridging this gap for a concrete
domain, the design and implementation of object-oriented container-like
component libraries, such as JCF, STL, Booch Components, LEDA, etc. At
the core of the framework we propose a new design pattern called
emph{Shortcut} together with its corresponding implementation. The
Shortcut pattern, introduced in a generic base class container, provides
a secure and efficient access to items in a container decoupled from the
implementation details of concrete containers. Shortcut enhances
applying the same principles that drive the design process to the
implementation process of these libraries: step-by-step implementation,
implementation with reuse and implementation for reuse without
penalising other quality criteria. Our framework not only supports the
design and implementation of new libraries but also the reengineering of
existing ones to overcome some of their drawbacks. We show by a case
study, reengineering the Booch Components in Ada95, the application and
benefits of our framework.Postprint (published version
Aspect-oriented design model.
Designing crosscutting concerns (aspects) is a challenging task. Since crosscutting concerns were not addressed while developing contemporary software design techniques, so they lack support for accommodating representation of such concerns along with base program. Some design languages like UML have been extended to express aspects and their elements but they do not fully represent aspects. Some lack adequate representation of aspect elements and some lack an efficient and reusable composition technique. In this paper, some of the aspect-oriented design techniques have been critically discussed. A proposed aspect model has been discussed which helps in overcoming the deficiencies in the contemporary aspect-oriented design techniques. This model represents aspects and their elements throughout the software development life cycle
Juice: An SVG Rendering Peer for Java Swing
SVG—a W3C XML standard—is a relatively new language for describing low-level vector drawings. Due to its cross-platform capabilities and support for events, SVG may potentially be used in interactive GUIs/graphical front-ends. However, a complete and full-featured widget set for SVG does not exist at the time of this writing. I have researched and implemented a framework which retargets a complete and mature raster- based widget library—the JFC Swing GUI library—into a vector-based display substrate: SVG. My framework provides SVG with a full-featured widget set, as well as augmenting Swing’s platform coverage. Furthermore, by using bytecode instrumentation techniques, my Swing to SVG bridging framework is transparent to the developers— allowing them to implement their user interfaces in pure Swing
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