7,482 papers · page 279 of 375
article Free Access Share on Subject-oriented design: towards improved alignment of requirements, design, and code Authors: Siobhán Clarke School of Computer Applications, Dublin City University, Dublin 9, Republic of Ireland School of Computer Applications, Dublin City Universit…
An analysis is provided for Java programs that reverse engineers parameterized types into existing Java code. This analysis propagates precise type information about the contents of container objects. As an application, the analysis can be used to justify the safe removal of down…
This paper describes a novel approach to managing the evolution of distributed, persistent systems at run-time. This is achieved by partitioning a system into disjoint zones, each of which can be evolved without affecting code in any other. Contracts are defined between zones, ma…
The Unified Modeling Language (UML) is a standard modeling language in which some of the best object-oriented (OO) modeling experiences are embedded. In this paper we illustrate the role formal specification techniques can play in developing a precise semantics for the UML. We pr…
This paper presents a sound type system for a large subset of the Java bytecode language including classes, interfaces, constructors, methods, exceptions, and bytecode subroutines. This work serves as the foundation for developing a formal specification of the bytecode language a…
We describe how reachability-based orthogonal persistence can be supported even in uncooperative implementations of languages such as C++ and Modula-3, and without modification to the compiler. Our scheme extends Bartlett's mostly-copying garbage collector to manage both transien…
Several recent studies have introduced lightweight versions of Java: reduced languages in which complex features like threads and reflection are dropped to enable rigorous arguments about key properties such as type safety. We carry this process a step further, omitting almost al…
This paper presents a performance evaluation of the mobile agent paradigm in comparison to the client/server paradigm. This evaluation has been conducted on top of the Java environment, using respectively RMI, the Aglets mobile agents platform and a mobile agents prototype that w…
This paper describes research in applications of aspect-oriented programming (AOP) as captured in the AspectJ™ language. In particular, it compares object-oriented and aspect-oriented designs and implementations of role models.
The Advanced Teaching and Learning Academic Server (Atlas) is a software system that supports web-based learning. Students can register for courses, and can navigate through personalized views of course material. Atlas has been built according to Sun Microsystem's Java™ Servlet s…
The proliferation of the Internet is fueling the development of mobile computing environments in which mobile code is executed on remote sites. In such environments, the end user must often wait while the mobile program is transferred from the server to the client where it execut…
In this paper we present the Generic Graph Component Library (GGCL), a generic programming framework for graph data structures and graph algorithms. Following the theme of the Standard Template Library (STL), the graph algorithms in GGCL do not depend on the particular data struc…
Object-based parallel and distributed applications are becoming increasingly popular, driven by the programmability advantages of component technology and a flat shared-object space. However, the flat shared-object space introduces a performance challenge: applications that rely …
Virtual classes and nested classes are distinguishing features of BETA. Nested classes originated from Simula, but until recently they have not been part of main stream object- oriented languages. C++ has a restricted form of nested classes and they were included in Java 1.1. Vir…
Object locking can be efficiently implemented by bimodal use of a field reserved in an object. The field is used as a lightweight lock in one mode, while it holds a reference to a heavyweight lock in the other mode. A bimodal locking algorithm recently proposed for Java achieves …
We present a domain-specific language for specifying recursive traversals of object structures, for use with the visitor pattern. Traversals are traditionally specified as iterations, forcing the programmer to adopt an imperative style, or are hard-coded into the program or visit…
In this paper we propose a new form of polymorphism for object-oriented languages, called correspondence polymorphism. It lies in a different dimension than either parametric or subtype polymorphism. In correspondence polymorphism, some methods are declared to correspond to other…
Modern generational garbage collectors look for garbage among the young objects, because they have high mortality; however, these objects include the very youngest objects, which clearly are still live. We introduce new garbage collection algorithms, called age-based, some of whi…
Traditional implementations of multiple inheritance bring about not only an overhead in terms of run-time but also a significant increase in object space. For example, the number of compiler-generated fields in a certain object can be as large as quadratic in the number of its su…
Java programs are routinely transmitted over low-bandwidth network connections as compressed class file archives (i.e., zip files and jar files). Since archive size is directly proportional to download time, it is desirable for applications to be as small as possible. This paper …