Pattern-Oriented Distributed System Architectures Douglas C. Schmidt [email protected] Electrical Engineering & Computer Science Vanderbilt University Nashville Tennessee, USA Tutorial Overview Developing software for distributed systems that effectively utilizes concurrency over high-speed, low-speed, and mobile networks is hard; developing high quality reusable distributed systems is even harder. The principles, methods, and skills required to develop reusable software cannot be learned by generalities. Instead, developers must learn through experience how reusable software components and frameworks can be designed, implemented, optimized, validated, maintained, and enhanced by applying good development practices and patterns. This tutorial describes how to apply patterns and middleware frameworks to alleviate the com- plexity of developing software for distributed systems. These patterns and framework components have been used successfully by the presenter on production communication software projects at many commercial companies for telecommunication systems, network management for personal communication systems, electronic medical imaging systems, real-time avionics and aerospace systems, distributed interactive simulations, and automated stock trading. The tutorial illustrates by example how to significantly simplify and enhance the development of communication software that effectively utilizes concurrency and distribution via the use of: Object-oriented design techniques, such as patterns, layered modularity, and data/control abstraction. Object-oriented language features, such as abstract classes, inheritance, dynamic binding, and parameterized types. Middleware, such as object-oriented frameworks for host infrastructure middleware (e.g., JVMs and ACE) and distribution middleware (e.g. CORBA and J2EE). Advanced operating system mechanisms, such as event demultiplexing, multi-threading, multi-processing, synchronization, and dynamic linking. The tutorial examines patterns and framework solutions abstracted from production systems in domains ranging from telecommunications, avionics, distributed electronic medical imaging systems, web servers, and real-time object request brokers to illustrate the key technical design and implementation issues. The material presented in this tutorial is based in part on the book “Pattern- Oriented Software Architecture: Patterns for Concurrent and Distributed Objects” [1], which is the second volume in the Pattern-Oriented Software Architecture (POSA) series [2]. References [1] D. C. Schmidt, M. Stal, H. Rohnert, and F. Buschmann, Pattern-Oriented Software Architecture: Patterns for Concurrent and Networked Objects, Volume 2. New York: Wiley & Sons, 2000. [2] F. Buschmann, R. Meunier, H. Rohnert, P. Sommerlad, and M. Stal, Pattern-Oriented Software Architecture—A System of Patterns. New York: Wiley & Sons, 1996.

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Pattern-Oriented Distributed System Architectures

Douglas C. [email protected]

Electrical Engineering & Computer ScienceVanderbilt University

Nashville Tennessee, USA

Tutorial Overview

Developing software for distributed systems that effectively utilizes concurrency over high-speed,low-speed, and mobile networks is hard; developing high quality reusable distributed systems iseven harder. The principles, methods, and skills required to develop reusable software cannot belearned by generalities. Instead, developers must learn through experience how reusable softwarecomponents and frameworks can be designed, implemented, optimized, validated, maintained, andenhanced by applying good development practices and patterns.

This tutorial describes how to apply patterns and middleware frameworks to alleviate the com-plexity of developing software for distributed systems. These patterns and framework componentshave been used successfully by the presenter on production communication software projects atmany commercial companies for telecommunication systems, network management for personalcommunication systems, electronic medical imaging systems, real-time avionics and aerospace sys-tems, distributed interactive simulations, and automated stock trading.

The tutorial illustrates by example how to significantly simplify and enhance the developmentof communication software that effectively utilizes concurrency and distribution via the use of:

� Object-oriented design techniques, such as patterns, layered modularity, and data/controlabstraction.

� Object-oriented language features, such as abstract classes, inheritance, dynamic binding,and parameterized types.

� Middleware, such as object-oriented frameworks for host infrastructure middleware (e.g.,JVMs and ACE) and distribution middleware (e.g.CORBA and J2EE).

� Advanced operating system mechanisms, such as event demultiplexing, multi-threading,multi-processing, synchronization, and dynamic linking.

The tutorial examines patterns and framework solutions abstracted from production systems indomains ranging from telecommunications, avionics, distributed electronic medical imaging sys-tems, web servers, and real-time object request brokers to illustrate the key technical design andimplementation issues. The material presented in this tutorial is based in part on the book “Pattern-Oriented Software Architecture: Patterns for Concurrent and Distributed Objects” [1], which is thesecond volume in the Pattern-Oriented Software Architecture (POSA) series [2].

References[1] D. C. Schmidt, M. Stal, H. Rohnert, and F. Buschmann,Pattern-Oriented Software Architecture: Patterns for

Concurrent and Networked Objects, Volume 2. New York: Wiley & Sons, 2000.

[2] F. Buschmann, R. Meunier, H. Rohnert, P. Sommerlad, and M. Stal,Pattern-Oriented Software Architecture—ASystem of Patterns. New York: Wiley & Sons, 1996.