J2Ee Design Patterns

A software design pattern can be identified as "a recurring solution to a recurring problem." Crawford and Kaplan's J2EE Design Patterns takes a fresh approach: Rather than simply present another catalog on design patterns, the authors broaden the scope by discussing ways to choose design patterns when building an enterprise application from scratch, looking closely at the real world tradeoffs that Java developers must weigh when architecting their applications. They also extend design patterns into areas not covered in other books, presenting original patterns for data modeling, transaction / process modeling, and interoperability. This design pattern book breaks the mold.

William Crawford has been developing web-based enterprise applications since 1995, including one of the first web-based electronic medical record systems (at Children's Hospital in Boston) and some of the first enterprise-level uses of Java. He has consulted for a variety of institutional clients, including Boston Children's Hospital, Harvard Medical Center, numerous startups and several Fortune 500 companies. Prior to an acquisition he was CTO of Invantage, Incorporated in Cambridge, MA. He received a degree in history and economics from Yale University. He is the co-author of Java Servlet Programming, 2nd Edition, Java Enterprise in a Nutshell, 2nd Edition, and two forthcoming O'Reilly titles. Will is currently Principal Software Architect at Perceptive Informatics, Inc.Massachusetts, provider of software and services to the pharmaceutical industry. He can be reached at http://www.williamcrawford.info

Jonathan Kaplan has been a software developer at Sun Microsystems since 1997. Before joining Sun, he worked on a web-based electronic records system at the Children's Hospital in Boston. At Sun, he has focused on system management, including early Java and browser based applications. Jonathan received his Bachelor's and Master's degrees in Computer and Information Science from the University of Pennsylvania. He currently lives with his wife Tracy in Cambridge, Massachusetts.

Preface

ix

1. Java Enterprise Design

1

(16)

Design Patterns

1

(3)

J2EE

4

(3)

Application Tiers

7

(3)

Core Development Concepts

10

(6)

Looking Ahead

16

(1)

2. The Unified Modeling Language

17

(19)

Origins of UML

18

(1)

The Magnificent Seven

19

(1)

UML and Software Development Lifecycles

20

(1)

Use Case Diagrams

21

(3)

Class Diagrams

24

(7)

Interaction Diagrams

31

(3)

Activity Diagrams

34

(1)

Deployment Diagrams

35

(1)

3. Presentation Tier Architecture

36

(27)

Server-Side Presentation Tier

37

(1)

Application Structure

38

(9)

Building a Central Controller

47

(16)

4. Advanced Presentation Tier Design

63

(26)

Reuse in Web Applications

64

(1)

Extending the Controller

65

(10)

Advanced Views

75

(14)

5. Presentation Tier Scalability

89

(24)

Scalability and Bottlenecks

90

(1)

Content Caching

91

(14)

Resource Pool

105

(8)

6. The Business Tier

113

(17)

The Business Tier

115

(3)

Domain Objects

118

(12)

7. Tier Communications

130

(12)

Data Transfer Patterns

130

(12)

8. Database and Data Patterns

142

(30)

Data Access Patterns

143

(11)

Primary Key Patterns

154

(5)

Object-Relational Mappings

159

(13)

9. Business Tier interfaces

172

(27)

Abstracting Business Logic

173

(10)

Accessing Remote Services

183

(10)

Finding Resources

193

(6)

10. Enterprise Concurrency

199

(30)

Transaction Management

200

(14)

General Concurrency Patterns

214

(3)

Implementing Concurrency

217

(12)

11. Messaging

229

(58)

Messaging and Integration

231

(4)

Message Distribution Patterns

235

(4)

Message Types

239

(3)

Correlating Messages

242

(1)

Message Client Patterns

243

(9)

Messaging and Integration

252

(6)

For Further Reading

258

(1)

12. J2EE Antipatterns

259

(1)

Causes of Antipatterns

260

(1)

Architectural Antipatterns

261

(5)

Presentation Tier Antipatterns

266

(8)

EJB Antipatterns

274

(13)

A. Presentation Tier Patterns

287

(13)

B. Business Tier Patterns

300

(26)

C. Messaging Patterns

326

(11)

D. J2EE Antipatterns

337

(6)

Index

343

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Summary

Author Biography

Table of Contents

Supplemental Materials