Summary:

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 Architecture (POSH) 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.

Table of Contents:

Foreword.....ix

About This Book.....xiii

About The Authors.....xxi

Guide To The Reader.....xxv

1: Concurrent and Networked Objects.....1

1.1: Motivation.....2

1.2: Challenges of Concurrent and Networked Software.....6

1.3: A Case Study: Designing a Concurrent Web Server.....24

1.4: Wrapping Up.....41

2: Service Access and Configuration Patterns.....43

Wrapper Facade.....47

Component Configurator.....75

Interceptor.....109

Extension Interface.....141

3: Event Handling Patterns.....175

Reactor.....179

Proactor.....215

Asynchronous Completion Token.....261

Acceptor-Connector.....285

4: Synchronization Patterns.....323

Scoped Locking.....325

Strategized Locking.....333

Thread-Safe Interface.....345 Double-Checked Locking Optimization . . . . . . . 353

5: Concurrency Patterns.....365

Active Object.....369

Monitor Object.....399

Half-Sync/Half-Async.....423

Leader/ Followers.....447

Thread-Specific Storage.....475

6: Weaving the Patterns Together.....505

6.1: From Individual Patterns to Pattern Languages.....506

6.2: A Pattern Language for Middleware

6.3: Beyond Concurrency and Networking.....522

6.4: Pattern Languages versus Pattern Systems.....524

7: The Past, Present, and Future of Patterns.....527

7.1: What Has Happened in the Past Four Years.....528

7.2: Where Patterns are Now.....532

7.3: Where Patterns are Going.....533

7.4: A Parting Thought on Predicting the Future.....542

8: Concluding Remarks.....543

Glossary.....545

Notations.....563

References.....569

Index of Patterns.....595

Index.....599

Index of Names.....631