From the Publisher:
Designing application and middleware software to run in concurrent and networked environments is a significant challenge to software developers The patterns catalogued in this second volume of Pattern-Oriented Software Architectures (POSA) form the basis of a pattern language that addresses issues associated with concurrency and networking
The book presents 17 interrelated patterns ranging from idioms through architectural designs They cover core elements of building concurrent and network systems: service access and configuration, event handling, synchronization,
and concurrency All patterns present extensive examples and known uses in multiple programming languages, including C++, C, and Java
The book can be used to tackle specific software development problems or read from cover to cover to provide a fundamental understanding of the best practices for constructing concurrent and networked applications and middleware
About the Authors
This book has been written by the award winning team responsible for the first POSA volume "A System of Patterns", joined in this volume by Douglas C Schmidt from University of California, Irvine (UCI), USA
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Pattern-Oriented Software Architecture, Patterns for Concurrent and Networked Objects

AspectJ implementations of the GoF design patterns show modularity improvements in 17 of 23 cases. These improvements are manifested in terms of better code locality, reusability, composability, and (un)pluggability.The degree of improvement in implementation modularity varies, with the greatest improvement coming when the pattern solution structure involves crosscutting of some form, including one object playing multiple roles, many objects playing one role, or an object playing roles in multiple pattern instances.

/pdf/design-pattern-implementation-in-java-and-aspectj-1b24bx7qff.pdf

Design pattern implementation in Java and aspectJ

In this paper, we propose cyber foraging: a mechanism to augment the computational and storage capabilities of mobile devices. Cyber foraging uses opportunistically discovered servers in the environment to improve the performance of interactive applications and distributed file systems on mobile clients. We show how the performance of distributed file systems can be improved by staging data at these servers even though the servers are not trusted. We also show how the performance of interactive applications can be improved via remote execution. Finally, we present VERSUDS: a virtual interface to heteregeneous service discovery protocols that can be used to discover these servers.

https://apollo.smu.edu.sg/papers/cyberforaging_sigops.pdf

The case for cyber foraging

Software patterns

Refactorings are behaviour-preserving program transformations that automate design-level changes in object-oriented applications. Our previous research established that many schema transformations, design patterns and hot-spot meta-patterns are automatable. This research evaluates whether refactoring technology can be transferred to the mainstream by restructuring non-trivial C++ applications. The applications that we examine were evolved manually by software engineers. We show that an equivalent evolution could be reproduced significantly faster and cheaper by applying a handful of general-purpose refactorings. In one application, over 14 K lines of code, that otherwise would have been coded by hand, were transformed automatically. Our experiments identify the benefits, limitations and topics of further research related to the transfer of refactoring technology to a production environment.

/pdf/evolving-object-oriented-designs-with-refactorings-3m1o4oiq5y.pdf

Evolving object-oriented designs with refactorings

Design patterns raise the abstraction level at which people design and communicate design of object-oriented software. However, the mechanics of implementing design patterns is left to the programmer. This paper describes the architecture and implementation of a tool that automates the implementation of design patterns. The user of the tool supplies application-specific information for a given pattern, from which the tool generates all the pattern-prescribed code automatically. The tool has a distributed architecture that lends itself to implementation with off-the-shelf components.

Automatic code generation from design patterns

In this paper we provide an overview of IBM WebSphere Studio, a family of tools for developing distributed applications for J2EE™ servers for state-of-the-art information technology systems. In today's business environment such systems are complex, comprise multiple platforms, and make use of a wide range of technologies and standards. Through a representative development scenario we illustrate the way WebSphere Studio satisfies the challenging requirements for a modern integrated development environment. The scenario covers a variety of technologies and standards, including database access, Web services standards, Enterprise JavaBeans™ implementation, integrated application testing, Web page design, and performance optimization. We also describe the Eclipse Modeling Framework, the open source technology base on which WebSphere Studio is built.

F. J. Budinsky

Papers

Automatic code generation from design patterns

WebSphere Studio overview