Wake up Neo... Dependencies have you

Ivan Mosiev —software architect,AltexSofti.k.mosev@gmail.comhttp://verber.kh.ua @polny_otec

Wake up, Neo...Dependencies have you

Ideal world

Ideal Unit

Welcome to thereal world

Real UnitDependencies

Imagine, there is nodependencies

Imaginary UnitIndirect Indirect Input Output

Indirect Input$internal = $Dependency->something;function dependency() { return $something; }function dependency() { throw new Exception_WTF; }function dependency(&$by_ref) { $by_ref++; }

Indirect Output$Dep->something = $internal;$Dep->doSomething($internal);

This is my world, my world!function runMatrix() { $agents = array(); while (TRUE) { $agents[] = new AgentSmith(); }}

Dependency Injection

Refactoring: step 0function doSomething() { $auth = new Service(); … return $profit;}

Refactoring: step 1private function getService() { return new Service();}function doSomething() { $service = $this->getService(); … return $profit;}

Refactoring: step 2private $_service;private function getService() { If (!$this->_service) $this->_service = new Service(); return $this->_service;}function setService(IService $service) { $this->_service = $service;}

do { $the->same();} while ($deps_count > 0);

function getService() { if (!$this->_service) $this->_service = return Service(); return $this->_service;}

Inversion of ControlIoC Container store information aboutdependenciesDependencies instantiated by ContainerrecursivelyDependencies injected into Object by ServiceContainer

Benefits?Mock and test everythingLoose couplingComponents reuse

Now you know kung fu

Wake up Neo... Dependencies have you

by Иван Мосев on Dec 23, 2011

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Wake up Neo... Dependencies have you — Presentation Transcript