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ASPECT ORIENTED PROGRAMMING IN PHP I’m Frank van den Brink. I’m a Pragmatist. @fvdb

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TODAY’S AGENDA

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THE ORIGINS

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THE ORIGINS HOW IT WORKS

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THE ORIGINS HOW IT WORKS USING IT IN PHP

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THE ORIGINS

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Source: http://siliconvalley.sutromedia.com/xerox-parc.html

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class SecretService { public function getSecret($id) { // Check access if (!$this->isAllowedToAccess($id)) { throw new AccessDeniedException('You cannot do this!'); } // Get the secret $secret = $this->storage->getById($id); // Log that someone’s fetching the secret $this->logger->info('Secret accessed!'); return $secret; } }

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SEPARATION OF CONCERNS Hürsch, Lopes - 1995

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Programming intertwined code is hard and complex since all concerns have to be dealt with at the same time and at the same level. Source: Separation of Concerns - Hürsch, Lopes - 1995

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Programming intertwined code is hard and complex since all concerns have to be dealt with at the same time and at the same level. The extended programming language provides no adequate abstraction of concerns at the implementation level. Source: Separation of Concerns - Hürsch, Lopes - 1995

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Intertwined code is hard to understand because of the above lack of abstraction. Source: Separation of Concerns - Hürsch, Lopes - 1995

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Commingled code is hard to maintain and modify because the concerns are strongly coupled. Source: Separation of Concerns - Hürsch, Lopes - 1995

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The intertwined code gives rise to inheritance anomalies due to the strong coupling of different concerns. Source: Separation of Concerns - Hürsch, Lopes - 1995

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The intertwined code gives rise to inheritance anomalies due to the strong coupling of different concerns. It becomes impossible to redefine a method implementation or the commingled special concern in a subclass without redefining both. Source: Separation of Concerns - Hürsch, Lopes - 1995

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class SecretService { public function getSecret($id) { // Check access if (!$this->isAllowedToAccess($id)) { throw new AccessDeniedException('You cannot do this!'); } // Get the secret $secret = $this->storage->getById($id); // Log that someone’s fetching the secret $this->logger->info('Secret accessed!'); return $secret; } }

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class SecretService { public function getSecret($id) { return $this->storage->getById($id); } }

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META-LEVEL PROGRAMMING ADAPTIVE PROGRAMMING COMPOSITION FILTERS

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RG AML ETCML DJ DJAVA

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AspectJ

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HOW IT WORKS

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class Awesome { } 89 50 4e 47 0d 0a 1a fe c3 1b 6c 88 COMPILER

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class SecretService { public function getSecret($id) { return $this->storage->getById($id); } }

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class SecretService { public function getSecret($id) { return $this->storage->getById($id); } } class AuthorizationAspect { public function checkAccessBeforeGetSecret($id) { if (!$this->isAllowedToAccess($id)) { throw new AccessDeniedException('You cannot do this!'); } } }

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class SecretService { public function getSecret($id) { return $this->storage->getById($id); } } class AuthorizationAspect { public function checkAccessBeforeGetSecret($id) { if (!$this->isAllowedToAccess($id)) { throw new AccessDeniedException('You cannot do this!'); } } } class LoggingAspect { public function logAfterGetSecret($id) { $this->logger->info('Secret accessed!'); } }

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class SecretService { public function getSecret($id) { // Check access if (!$this->isAllowedToAccess($id)) { throw new AccessDeniedException('You cannot do this!'); } // Get the secret $secret = $this->storage->getById($id); // Log that someone’s fetching the secret $this->logger->info('Secret accessed!'); return $secret; } }

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CROSS CUTTING CONCERN

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CROSS CUTTING CONCERN

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CROSS CUTTING CONCERN ASPECTS

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CROSS CUTTING CONCERN ASPECTS ADVICE

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class LoggingAspect { public function logAfterGetSecret($id) { $this->logger->info('Secret accessed!'); } }

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CROSS CUTTING CONCERN ASPECTS ADVICE

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CROSS CUTTING CONCERN ASPECTS ADVICE JOIN POINTS

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class SecretService { public function getSecret($id) { return $this->storage->getById($id); } } BEFORE METHOD CALL

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class SecretService { public function getSecret($id) { return $this->storage->getById($id); } } AFTER METHOD CALL

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class SecretService { public function getSecret($id) { return $this->storage->getById($id); } } AROUND METHOD CALL

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CROSS CUTTING CONCERN ASPECTS ADVICE JOIN POINTS

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CROSS CUTTING CONCERN ASPECTS ADVICE JOIN POINTS POINT CUTS

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Before( execution( public SecretService->*(*) ) )

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CROSS CUTTING CONCERN ASPECTS ADVICE JOIN POINTS POINT CUTS

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CROSS CUTTING CONCERN ASPECTS ADVICE JOIN POINTS POINT CUTS WEAVING

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WEAVING

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WEAVING

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WEAVING

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WEAVING

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WEAVING

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CROSS CUTTING CONCERN ASPECTS ADVICE JOIN POINTS POINT CUTS WEAVING

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USING IT IN PHP

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CAN YOU USE IT IN PHP?

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X X X X X O O O O

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X X X X X O O O O O

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AOP-PHP Flow AOP Go! AOP JMSAopBundle

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AOP-PHP Flow AOP Go! AOP JMSAopBundle ext lib lib lib

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AOP-PHP Flow AOP Go! AOP JMSAopBundle ext lib lib lib

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AOP-PHP Flow AOP Go! AOP JMSAopBundle ext lib lib lib

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AOP-PHP

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function logAfterGetSecret() { $this->logger->info('Secret accessed!'); } aop_add_after( 'SecretService->getSecret()', 'logAfterGetSecret' );

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Go! AOP

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new Example\Foobar Autoloader Weaver

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new Example\Foobar Autoloader Weaver

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new Example\Foobar Autoloader Weaver

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new Example\Foobar Autoloader Weaver

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new Example\Foobar Autoloader Weaver

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new Example\Foobar Autoloader Weaver

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new Example\Foobar Autoloader Weaver

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new Example\Foobar Autoloader Weaver

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class LoggingAspect implements Aspect { /** * @After("execution(public SecretService->getSecret(*))") */ public function logAfterGetSecret(MethodInvocation $invocation) { $args = $invocation->getArguments(); $this->logger->info('Secret ' . $args[0] . ' accessed!'); } }

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class CachingAspect implements Aspect { /** * @Around("execution(public SecretService->getSecret(*))") */ public function cacheGetSecret(MethodInvocation $invocation) { $args = $invocation->getArguments(); if ($this->cache->has($args[0])) { return $this->cache->get($args[0]); } $secret = $invocation->proceed(); $this->cache->set($args[0], $secret); return $secret; } }

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SHOULD YOU USE AOP?

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PERFORMANCE

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PERFORMANCE CLARITY

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PERFORMANCE CLARITY DON’T GO NUTS

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AOP ALL THE THINGS!

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MERCI BIEN @fvdb http://about.me/fvdb http://speakerdeck.com/u/fvdb