Pattern-Oriented Software Architecture: Patterns for by Douglas C. Schmidt, Michael Stal

By Douglas C. Schmidt, Michael Stal

Designing software and middleware software program to run in concurrent and networked environments is an important problem to software program builders. The styles catalogued during this second volume of Pattern-Oriented software program Architectures (POSA) shape the foundation of a development language that addresses matters linked to concurrency and networking.

The e-book offers 17 interrelated styles starting from idioms via architectural designs. They disguise center parts of establishing concurrent and community structures: provider entry and configuration, occasion dealing with, synchronization, and concurrency. All styles current broad examples and identified makes use of in a number of programming languages, together with C++, C, and Java.

The e-book can be utilized to take on particular software program improvement difficulties or learn from disguise to hide to supply a primary figuring out of the easiest practices for developing concurrent and networked purposes and middleware.

About the Authors
This booklet has been written via the award profitable workforce accountable for the 1st POSA quantity A method of Patterns, joined during this quantity by way of Douglas C. Schmidt from college of California, Irvine (UCI), USA.

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Additional resources for Pattern-Oriented Software Architecture: Patterns for Concurrent and Networked Objects (Pattern-Oriented Software Architecture, Volume 2)

Example text

Hybrids of these three methods are also evident. Ada is designed for all the above situations. Because of the different implementation methods, the term concurrent, rather than parallel, is of more use in this area of computing. Two processes are said to be executing in parallel if at any instant they are both executing. Therefore, in the above classifications only cases (2) and (3) are truly parallel. By comparison, two processes are said to be concurrent if they have the potential for executing in parallel.

This can be difficult. If BURNSWELL: “BURNS” — 2007/4/27 — 20:22 — PAGE 37 — #51 38 Inter-process communication process P1 sends a message to process P2, and expects a reply, what action should it take if the reply does not materialise? Does it assume that the original message was lost, or that the reply is lost, or that P2 has failed or is running slowly? An easy approach for the language is to assume that the run-time system implements a completely reliable communication system. This may take the form of support for an atomic transaction.

The path through the program may differ due to variations in input data, but for any particular execution of the program there is only one path. A modern computer system will, by comparison, consist of one or more central processors and many I/O devices, all of which are operating in parallel. Moreover, an operating system that provides for interactive use will always support many executing programs (called processes†), in the sense that they are being timesliced onto the available processors. The effect of fast process switching is to give behaviour that is almost indistinguishable from true parallelism.

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