Extension and Java Implementation of the Reactor- Acceptor- Connector Pattern Combination *

Abstract

Development of efficient client- server applications involves good knowledge of multithreading and network communication, domains often closely related to the operating system. Therefore, the reusability of components could be limited by some system specific techniques or limitations used in the design. To enhance the reusability and ease of use, it is then very important to decouple communication establishment and initialization from service use in a client- server application. In this way, upgrades are simplified and one can improve, for instance, the message format without knowing the way services work. On the other hand a developer in charge of maintaining or creating a new kind of service does not need to know how the connections are concretely established. The composition of the Reactor pattern [2] and the Acceptor- Connector pattern [1] provides a powerful pattern to handle concurrent requests delivered to a server with the benefit of the separation of concerns between connection establishment and service use. We tried to enhance the portability of this solution by considering a Java implementation of this composition. But the Java language presents significant differences with C++, which lead us to modify the original patterns designed by D. C. Schmidt and to introduce a new pattern based on the Reactor pattern to solve the encountered problems.

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