Pattern-Oriented Software Architecture, a Pattern Language for Distributed Computing

The eagerly awaited Pattern-Oriented Software Architecture (POSA) Volume 4 is about a pattern language for distributed computing.


The authors will guide you through the best practices and introduce you to key areas of building distributed software systems. POSA 4 connects many stand-alone patterns, pattern collections and pattern languages from the existing body of literature found in the POSA series. Such patterns relate to and are useful for distributed computing to a single language.

* The panel of experts provides you with a consistent and coherent holistic view on the craft of building distributed systems.
* Includes a foreword by Martin Fowler
* A must read for practitioners who want practical advice to develop a comprehensive language integrating patterns from key literature.

Foreword xv
About This Book xvii
About The Authors xxiii
Guide To The Reader xxvii
Part I Some Concepts 1
1 On Patterns and Pattern Languages 3
1. 1 Patterns Introduced 4
1. 2 Inside Patterns 6
1. 3 Between Patterns 10
1. 4 Into Pattern Languages 13
1. 5 Patterns Connected 15
2 On Distributed Systems 17
2. 1 Benefits of Distribution 18
2. 2 Challenges of Distribution 20
2. 3 Technologies for Supporting Distribution 22
2. 4 Limitations of Middleware 32
3 On the Pattern Language 33
3. 1 Intent, Scope, and Audience 34
3. 2 Origins and Genesis 35
3. 3 Structure and Content 36
3. 4 Presentation 44
3. 5 Practical Use 49
Part II A Story 53
4 Warehouse Management Process Control 57
4. 1 System Scope 58
4. 2 Warehouse Management Process Control 60
5 Baseline Architecture 65
5. 1 Architecture Context 66
5. 2 Partitioning the Big Ball of Mud 67
5. 3 Decomposing the Layers 68
5. 4 Accessing Domain Object Functionality 71
5. 5 Bridging the Network 72
5. 6 Separating User Interfaces 76
5. 7 Distributing Functionality 79
5. 8 Supporting Concurrent Domain Object Access 82
5. 9 Achieving Scalable Concurrency 85
5. 10 Crossing the Object-Oriented/Relational Divide 87
5. 11 Configuring Domain Objects at Runtime 89
5. 12 Baseline Architecture Summary 90
6 Communication Middleware 95
6. 1 A Middleware Architecture for Distributed Systems 96
6. 2 Structuring the Internal Design of the Middleware 100
6. 3 Encapsulating Low-level System Mechanisms 103
6. 4 Demultiplexing ORB Core Events 105
6. 5 Managing ORB Connections 108
6. 6 Enhancing ORB Scalability 111
6. 7 Implementing a Synchronized Request Queue 114
6. 8 Interchangeable Internal ORB Mechanisms 116
6. 9 Consolidating ORB Strategies 118
6. 10 Dynamic Configuration of ORBs 121
6. 11 Communication Middleware Summary 124
7 Warehouse Topology 129
7. 1 Warehouse Topology Baseline 130
7. 2 Representing Hierarchical Storage 131
7. 3 Navigating the Storage Hierarchy 133
7. 4 Modeling Storage Properties 135
7. 5 Varying Storage Behavior 137
7. 6 Realizing Global Functionality 140
7. 7 Traversing the Warehouse Topology 142
7. 8 Supporting Control Flow Extensions 144
7. 9 Connecting to the Database 146
7. 10 Maintaining In-Memory Storage Data 147
7. 11 Configuring the Warehouse Topology 149
7. 12 Detailing the Explicit Interface 151
7. 13 Warehouse Topology Summary 153
8 The Story Behind The Pattern Story 157
Part III The Language 163
9 From Mud To Structure 167
Domain Model ** 182
Layers ** 185
Model-View-Controller ** 188
Presentation-Abstraction-Control 191
Microkernel ** 194
Reflection * 197
Pipes and Filters ** 200
Shared Repository ** 202
Blackboard 205
Domain Object ** 208
10 Distribution Infrastructure 211
Messaging ** 221
Message Channel ** 224
Message Endpoint ** 227
Message Translator ** 229
Message Router ** 231
Publisher-Subscriber ** 234
Broker ** 237
Client Proxy ** 240
Requestor ** 242
Invoker ** 244
Client Request Handler ** 246
Server Request Handler ** 249
11 Event Demultiplexing and Dispatching 253
Reactor ** 259
Proactor * 262
Acceptor-Connector ** 265
Asynchronous Completion Token ** 268
12 Interface Partitioning 271
Explicit Interface ** 281
Extension Interface ** 284
Introspective Interface ** 286
Dynamic Invocation Interface * 288
Proxy ** 290
Business Delegate ** 292
Facade ** 294
Combined Method ** 296
Iterator ** 298
Enumeration Method ** 300
Batch Method ** 302
13 Component Partitioning 305
Encapsulated Implementation ** 313
Whole-Part ** 317
Composite ** 319
Master-Slave * 321
Half-Object plus Protocol ** 324
Replicated Component Group * 326
14 Application Control 329
Page Controller ** 337
Front Controller ** 339
Application Controller ** 341
Command Processor ** 343
Template View ** 345
Transform View ** 347
Firewall Proxy ** 349
Authorization ** 351
15 Concurrency 353
Half-Sync/Half-Async ** 359
Leader/Followers ** 362
Active Object ** 365
Monitor Object ** 368
16 Synchronization 371
Guarded Suspension ** 380
Future ** 382
Thread-Safe Interface * 384
Double-Checked Locking 386
Strategized Locking ** 388
Scoped Locking ** 390
Thread-Specific Storage 392
Copied Value ** 394
Immutable Value ** 396
17 Object Interaction 399
Observer ** 405
Double Dispatch ** 408
Mediator * 410
Command ** 412
Memento ** 414
Context Object ** 416
Data Transfer Object ** 418
Message ** 420
18 Adaptation and Extension 423
Bridge ** 436
Object Adapter ** 438
Chain of Responsibility * 440
Interpreter 442
Interceptor ** 444
Visitor ** 447
Decorator 449
Execute-Around Object ** 451
Template Method * 453
Strategy ** 455
Null Object ** 457
Wrapper Facade ** 459
Declarative Component Configuration * 461
19 Modal Behavior 463
Objects for States * 467
Methods for States * 469
Collections for States ** 471
20 Resource Management 473
Container * 488
Component Configurator * 490
Object Manager ** 492
Lookup ** 495
Virtual Proxy ** 497
Lifecycle Callback ** 499
Task Coordinator * 501
Resource Pool ** 503
Resource Cache ** 505
Lazy Acquisition ** 507
Eager Acquisition ** 509
Partial Acquisition * 511
Activator ** 513
Evictor ** 515
Leasing ** 517
Automated Garbage Collection ** 519
Counting Handle ** 522
Abstract Factory ** 525
Builder * 527
Factory Method ** 529
Disposal Method ** 531
21 Database Access 533
Database Access Layer ** 538
Data Mapper ** 540
Row Data Gateway ** 542
Table Data Gateway ** 544
Active Record 546
22 A Departing Thought 549
Glossary 553
References 573
Index of Patterns 587
Index of Names 593
Subject Index 595