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Dependency Injection

by: Prasanna, Dhanji

Dependency Injection

by: Prasanna, Dhanji

ISBN 13:
9781933988559
ISBN 10:
193398855X
Format: Paperback
Copyright: 08/28/2009
Publisher: Manning Pubns Co

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Summary

In object-oriented programming, a central program normally controls other objects in a module, library, or framework. With dependency injection, this pattern is inverted-a reference to a service is placed directly into the object, which eases testing and modularity. Spring or Google Guice use dependency injection so you can focus on your core application and let the framework handle infrastructural concerns.

Preface	p. xv
Acknowledgments	p. xvii
About this book	p. xix
About the cover illustration	p. xxii
Dependency injection: what's all the hype?	p. 1
Every solution needs a problem	p. 2
Seeing objects as services	p. 2
Pre-DI solutions	p. 4
Construction by hand	p. 5
The Factory Pattern	p. 7
The Service Locator pattern	p. 12
Embracing dependency injection	p. 13
The Hollywood Principle	p. 13
Inversion of Control vs. dependency injection	p. 15
Dependency injection in the real world	p. 17
Java	p. 17
DI in other languages and libraries	p. 19
Summary	p. 19
Time for injection	p. 21
Bootstrapping the injector	p. 22
Constructing objects with dependency injection	p. 23
Metadata and injector configuration	p. 26
XML injection in Spring	p. 27
From XML to in-code configuration	p. 30
Injection in PicoContainer	p. 31
Revisiting Spring and autowiring	p. 34
Identifying dependencies for injection	p. 36
Identifying by string keys	p. 37
Limitations of string keys	p. 42
Identifying by type	p. 44
Limitations of identifying by type	p. 46
Combinatorial keys: a comprehensive solution	p. 47
Separating infrastructure and application logic	p. 51
Summary	p. 52
Investigating DI	p. 54
Injection idioms	p. 55
Constructor injection	p. 55
Setter injection	p. 56
Interface injection	p. 60
Method decoration (or AOP injection)	p. 62
Choosing an injection idiom	p. 65
Constructor vs. Setter injection	p. 66
The constructor pyramid problem	p. 69
The circular reference problem	p. 71
The in-construction problem	p. 75
Constructor injection and object validity	p. 78
Not all at once: partial injection	p. 81
The reinfection problem	p. 81
Reinjection with the Provider pattern	p. 82
The contextual injection problem	p. 84
Contextual injection with the Assisted Injection pattern	p. 86
Flexible partial injection with the Builder pattern	p. 88
Injecting Objects in sealed code	p. 92
Injecting with externalized metadata	p. 93
Using the Adapter pattern	p. 95
Summary	p. 96
Building modular applications	p. 99
Understanding the role of an object	p. 100
Separation of concerns (my pants are too tight!)	p. 101
Perils of tight coupling	p. 102
Refactoring impacts of tight coupling	p. 105
Programming to contract	p. 108
Loose coupling with dependency injection	p. 111
Testing components	p. 112
Out-of-container (unit) testing	p. 113
I really need my dependencies!	p. 114
More on mocking dependencies	p. 115
Integration testing	p. 116
Different deployment profiles	p. 118
Rebinding dependencies	p. 118
Mutability with the Adapter Pattern	p. 119
Summary	p. 121
Scope: a fresh breath of state	p. 123
What is scope?	p. 124
The no scope (or default scope)	p. 125
The singleton scope	p. 128
Singletons in practice	p. 131
The singleton anti-pattern	p. 135
Domain-specific scopes: the web	p. 139
HTTP request scope	p. 141
HTTP session scope	p. 149
Summary	p. 154
More use cases in scoping	p. 156
Defining a custom scope	p. 157
A quick primer on transactions	p. 157
Creating a custom transaction scope	p. 158
A custom scope in Guice	p. 160
A custom scope in Spring	p. 164
Pitfalls and corner cases in scoping	p. 166
Singletons must be thread-safe	p. 167
Perils of Scope-widening injection	p. 169
Leveraging the Power of scopes	p. 180
Cache scope	p. 181
Grid Scope	p. 181
Transparent grid computing with DI	p. 183
Summary	p. 184
From birth to death: object lifecycle	p. 186
Significant events in the life of objects	p. 187
Object creation	p. 187
Object destruction (or finalization)	p. 189
One size doesn't fit all (domain-Specific lifecycle)	p. 191
Contrasting lifecycle scenarios: servlets vs. database connections	p. 191
The Destructor anti-pattern	p. 196
Using Java's Closeable interface	p. 197
A real-world lifecycle scenario: stateful EJBs	p. 198
Lifecycle and lazy instantiation	p. 201
Customizing lifecycle with postprocessing	p. 202
Customizing lifecycle with multicasting	p. 205
Summary	p. 207
Managing an object's behavior	p. 210
Intercepting methods and AOP	p. 211
A tracing interceptor with Guice	p. 212
A tracing interceptor with Spring	p. 214
How proxying works	p. 216
Too much advice can be dangerous!	p. 219
Enterprise use cases for interception	p. 221
Transactional methods with warp-persist	p. 222
Securing methods with Spring Security	p. 224
Pitfalls and assumptions about interception and proxying	p. 228
Sameness tests are unreliable	p. 228
Static methods cannot be intercepted	p. 230
Neither can private methods	p. 231
And certainly not final methods!	p. 233
Fields are off limits	p. 234
Unit tests and interception	p. 236
Summary	p. 238
Best practices in code design	p. 240
Objects and visibility	p. 241
Safe publication	p. 244
Safe wiring	p. 245
Objects and design	p. 247
On data and services	p. 247
On Better encapsulation	p. 252
Objects and concurrency	p. 257
More on mutability	p. 258
Synchronization vs. concurrency	p. 261
Summary	p. 264
Integrating with third-party frameworks	p. 266
Fragmentation of DI solutions	p. 267
Lessons for framework designers	p. 270
Rigid configuration anti-patterns	p. 271
Black box anti-patterns	p. 276
Programmatic configuration to the rescue	p. 280
Case study: JSR-303	p. 280
Summary	p. 286
Dependency injection in action!	p. 289
Crosstalk: a Twitter Clone!	p. 290
Crosstalk's requirements	p. 290
Setting up the application	p. 290
Configuring Google Sitebricks	p. 294
Crosstalk's modularity and service coupling	p. 295
The presentation layer	p. 296
The HomePage template	p. 298
The Tweet domain object	p. 301
Users and sessions	p. 302
Logging in and out	p. 304
The persistence layer	p. 308
Configuring the Persistence layer	p. 310
The security layer	p. 311
Tying up to the web lifecycle	p. 312
Finally: up and running!	p. 313
Summary	p. 314
The Butterfly Container	p. 315
Smarty Pants for Adobe Flex	p. 320
index	p. 323
Table of Contents provided by Ingram. All Rights Reserved.

Amazon no longer offers textbook rentals. We do!

Dependency Injection

Dependency Injection

9781933988559

193398855X

Summary

Author Biography

Table of Contents

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