Aspect Oriented Programming
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The document introduces aspect-oriented programming (AOP) and its applications, emphasizing the separation of cross-cutting concerns such as logging and caching into specific aspects that enhance functionality without altering the existing codebase. It details core concepts including join points, advice, and pointcuts, as well as practical steps to implement AOP using the Go! AOP framework. Additionally, it touches on advanced uses, testing strategies, and available resources for further exploration.
Aspect Oriented Programming
- 1. @magma_digital Code All the Things An introduction to Aspect–Oriented Programming
- 2. @magma_digital Who am I? ๏ Jeremy Coates, CEO, Magma Digital Ltd ๏ Founder of PHPNW User Group & Conference ๏ Digital Lancashire CIC Founding Director ๏ International Conference Speaker ๏ Coach of Coaches - WeCa.mp (code camp) ๏ @phpcodemonkey ๏ linkedin.com/in/jeremycoates
- 3. @magma_digital ★ Aspect–Oriented Programming - using Go! AOP • Separate cross-cutting concerns (logging, caching etc.) into Aspects (aka. a class that implements Aspect) • Adds behaviour without modifying code itself - Advice (can be an annotation e.g. @Around, @Before or @After) • An approach to specify where to apply an Advice - Pointcut (regex matching) / Join Points (a script execution point e.g. method) Aspect–Oriented What?
- 4. @magma_digital ★ Concerns like logging, security, caching • Don’t neatly fit traditional OOP models • They cut across concerns and litter our code • $logger->info(‘message’); • $perm->hasPriv(‘admin’); OOP but not as we know it
- 5. @magma_digital ★ Regular classes that bundle functionality • Like logging, caching, security etc. • Use annotations to trigger method invocation • @Before(“@execution(MagmaDigitalAnnotatio nLoggable)”) • @Before("execution(public Example->*(*))") Aspect
- 6. @magma_digital ★ A conceptual term indicating a point during the execution of a script e.g. • Method or • Property Access Join Point
- 7. @magma_digital ★ Action taken by an Aspect at a given Join Point - Identified by an annotation • @Before - executes before the Join Point • @After / @AfterThrowing - Executes after the Join Point exits • @Around - surrounds the Join Point • Custom behaviour before & after, can also prevent continued execution, return own value/exception etc. @Advice
- 8. @magma_digital ★ Simply a regular expression that matches join points • An Advice is linked to the Pointcut and runs at any Join Point matched by the regex • e.g. methods matching a certain name stub • @Pointcut("@execution(MagmaDigital AnnotationLoggableDetailed)") Pointcut
- 9. @magma_digital ★ Framework depends on autoloading • Really old legacy code needs converting first ★ composer require goaop/framework ★ Create application AspectKernel ★ Configure AspectKernel ★ Create an Aspect class (& Register in AspectKernel) Go! AOP First 10 Minutes
- 10. @magma_digital ★ Aspect–Oriented Programming can also • Introduce new interfaces / traits (inter-type declaration) • e.g. make all DTOs implement Serializable • Weave code - link to other applications/objects • e.g. Doctrine Entities Advanced Use
- 11. @magma_digital ★ PHPStorm - Go! AOP Framework plugin • also needs PHP Annotations Plugin ★ Frameworks • goaop-laravel-bridge • goaop-symfony-bundle • goaop-zf2-module Support
- 12. @magma_digital ★ Codeception/AspectMock (github) • Based on Go! AOP • Create test doubles for static methods • Create test doubles for class methods (wherever they’re called) • Redefine (PHP or user)methods on the fly Aspect–Oriented Testing
- 13. @magma_digital ★ http://go.aopphp.com/docs/ ★ https://packagist.org/packages/goaop/framework ★ https://github.com/goaop/framework • https://github.com/goaop ★ https://github.com/Codeception/AspectMock Resources
Editor's Notes
- #3: I’ve been a developer for almost 20 years and have long history of consulting, adopting other peoples projects and running kick-ass software agency. For my day job, I am CEO of Magma Digital Ltd, a 20 strong team focussing on delivering business critical software development, using PHP, to enterprise. I am also the driving force behind the UK's PHPNW conference, user group and brand, I started the group in 2008 and have, with assistance from many others, helped the group to be able to deliver seven years of high quality conferences, now with 400+ delegates. The passion for this comes from my personal drive to improve skills in those around me who I serve through mentoring, coaching, training and speaking. Pleasure of attending all but 1 Benelux conference and speaking at PHPBNL 12, 14 and now 16 - seems like even numbered years are my thing!