Aspect-Oriented Programming and Depedency Injection
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From the Dynamic Languages World 2008 in Karlsruhe. This session introduces two powerful techniques which support a clean design of enterprise applications and the implementation of a domain-driven design. In addition to the theoretical background you will learn how to take advantage of AOP and DI in your own projects. The examples given are based on the FLOW3 framework.
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Aspect-Oriented Programming and Depedency Injection
- 1. Robert Lemke | TYPO3 Association AOP and Dependency Injection
- 2. Overview About me, the flow and buzz ... Unit Testing Dependency Injection Aspect-Oriented Programming AOP and Dependency Injection
- 3. About me Robert Lemke, born 27/05/1976 beautiful code evangelist "chief architect" of TYPO3 5.0 and FLOW3 coffee junkie married, no children, 1 espresso machine AOP and Dependency Injection
- 4. About me HINT Robert Lemke, born 27/05/1976 beautiful code evangelist "chief architect" of TYPO3 5.0 and FLOW3 coffee junkie married, no children, 1 espresso machine AOP and Dependency Injection
- 5. About FLOW3 Offspring from the development of TYPO3 5.0 PHP-based enterprise application framework Enterprise: Information intensive applications with focus on domain logic FLOW3 is ready to go, with a default layer architecture, object management, security etc. Special support for Domain-Driven Design AOP and Dependency Injection
- 6. About the buzz AOP, DI, DDD, TDD, XP, ... ? YAGNI ? IMYLME ! AOP and Dependency Injection
- 7. The Demo Package Demo AOP and Dependency Injection
- 9. Unit Testing Testing is important (as if you didn't know that) But not every code can be tested Dependencies make your developer's life hard AOP and Dependency Injection
- 10. Unit Testing Dependencies Problem: Classes explicitly refer to other classes: AOP and Dependency Injection
- 11. Unit Testing Dependencies Try to test this class: AOP and Dependency Injection
- 12. Unit Testing Dependencies Unit Testing: You want to test a small unit You don't want to test The Simple File Logger The Card Repository AOP and Dependency Injection
- 13. Unit Testing Dependencies Unit Testing: You want to test a small unit You want to test if the action returns a string representation of the random card it gets from the repository AOP and Dependency Injection
- 14. Dependency Injection A class doesn't ask for the instance of another class but gets it injected This methodology is referred to as the "Hollywood Principle": "Don't call us, we'll call you" Enforces loose coupling and high cohesion Allows you to mock collaborators Makes you a better programmer AOP and Dependency Injection
- 15. Dependency Injection Constructor without Dependency Injection AOP and Dependency Injection
- 16. Dependency Injection Component with Constructor Injection AOP and Dependency Injection
- 17. Dependency Injection Component with Setter Injection AOP and Dependency Injection
- 18. Dependency Injection Component Manager Manages the whole object lifecycle Provides so-called "IoC Container" Components: objects Components can be configured AOP and Dependency Injection
- 19. Dependency Injection Autowiring FLOW3 tries to autowire constructor arguments and arguments of inject* methods The type of the component to be injected is determined by the argument type (type hinting) Autowiring does not work with Setter Injection through regular setters (set* methods) Dependencies are only autowired if no argument is passed explicitly AOP and Dependency Injection
- 20. Dependency Injection Component scope Component objects always live in a certain scope Currently supported scopes are: Singleton - Only one instance exists during one script run Prototype - Multiple instances are possible AOP and Dependency Injection
- 21. Dependency Injection Component scope The scope can be defined through an annotation in the component class (recommended) through the component configuration in a Components.php file The default scope is "Singleton" AOP and Dependency Injection
- 22. Components Component scope AOP and Dependency Injection
- 23. Components Creating Prototypes Dependency Injection can be used in almost any case, there's no need to call getComponent() But what if you need to instantiate a component within a method? AOP and Dependency Injection
- 24. Components Creating Prototypes Solution A: Call getComponent() AOP and Dependency Injection
- 25. Components Creating Prototypes Solution B: Call a factory method AOP and Dependency Injection
- 26. Aspect Oriented Programming AOP is a programming paradigm complements OOP by separating concerns to improve modularization OOP modularizes concerns: methods, classes, packages AOP addresses cross-cutting concerns AOP and Dependency Injection
- 27. Aspect Oriented Programming Cross-cutting concerns Presentation Domain Data source AOP and Dependency Injection
- 28. Aspect Oriented Programming Cross-cutting concerns Presentation The concerns live here Domain Data source AOP and Dependency Injection
- 29. Aspect Oriented Programming Cross-cutting concerns Some Domain Model Security CONCERNS Logging X-ING AOP and Dependency Injection
- 30. Aspect Oriented Programming PHP's missing features With AOP you can centralize and cleanly separate your concerns intercept any method call add new behavior to legacy code without touching it do a lot of dirty tricks AOP and Dependency Injection
- 31. Aspect Oriented Programming Some Vocabulary Advice encapsulated code, to be re-used Joinpoint places in the code where advice can be applied Pointcut identifies set of joinpoints where advice should be applied Aspect groups advices and pointcuts AOP and Dependency Injection
- 32. The AOP Hello World Classic Demo Demo AOP and Dependency Injection
- 34. Aspect Oriented Programming Applications for AOP Logging Security Transactions Persistence Statistics In the Domain Layer AOP and Dependency Injection
- 35. Aspect Oriented Programming Behind the Scenes Dynamic Proxy Classes Component Manager delivers the right implementation Only works if "new" is not used AOP and Dependency Injection
- 36. More ... AOP and Dependency Injection
- 37. More Where can I get FLOW3? From our Subversion repository: https://svn.typo3.org/FLOW3/Distribution/trunk/ AOP and Dependency Injection
- 38. More ... DEV3 AOP and Dependency Injection
- 39. More ... AOP Browser AOP and Dependency Injection
- 40. More ... Known Issues FLOW3 (or rather PHP) currently causes Apache crashes - why ever ... Tests consume a lot of memory (> 400 MB) Access is comparably slow even in Production context (~ 3 req/s) and needs much memory (~ 20 MB) Many aspects are work in progress and neither optimized nor finished AOP and Dependency Injection
- 41. Links FLOW3 Website http://flow3.typo3.org TYPO3 Forge http://forge.typo3.org T3CAST http://typo3.org/podcasts/robert AOP and Dependency Injection
- 42. So long and thanks for the fish Questions AOP and Dependency Injection