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POWhy use the Service Manager in Zend Framework 2?
 

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  1. POWhy use the Service Manager in Zend Framework 2?
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    <p>lets say i have a service:</p> <pre><code>namespace Helloworld\Service; class GreetingService { public function getGreeting() { if(date("H") &lt;= 11) return "Good morning, world!"; else if (date("H") &gt; 11 &amp;&amp; date("H") &lt; 17) return "Hello, world!"; else return "Good evening, world!"; } } </code></pre> <p>and i create an invokable for it</p> <pre><code>public function getServiceConfig() { return array( 'invokables' =&gt; array( 'greetingService' =&gt; 'Helloworld\Service\GreetingService' ) ); } </code></pre> <p>then in my controller i could do:</p> <pre><code>public function indexAction() { $greetingSrv = $this-&gt;getServiceLocator() -&gt;get('greetingService'); return new ViewModel( array('greeting' =&gt; $greetingSrv-&gt;getGreeting()) ); } </code></pre> <p>supposedly this make the controller dependent of the service (and the ServiceManager)</p> <p>and the better solution is to create factory for that service or return a closure in the ServiceManager and create a setter in the controller:</p> <pre><code>class IndexController extends AbstractActionController { private $greetingService; public function indexAction() { return new ViewModel( array( 'greeting' =&gt; $this-&gt;greetingService-&gt;getGreeting() ) ); } public function setGreetingService($service) { $this-&gt;greetingService = $service; } } </code></pre> <p>and </p> <pre><code>'controllers' =&gt; array( 'factories' =&gt; array( 'Helloworld\Controller\Index' =&gt; function($serviceLocator) { $ctr = new Helloworld\Controller\IndexController(); $ctr-&gt;setGreetingService( $serviceLocator-&gt;getServiceLocator() -&gt;get('greetingService') ); return $ctr; } ) ) </code></pre> <p>My question is why? Why is the second approach better than the first one? and What does it mean that the <code>controller is dependent of the service</code>?</p> <p>thanks</p>
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    1. COYou can mix both approaches. You can find examples in ZfcUser module: getters use injected service if available or get one from serviceLocator.
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    2. CO@Xerkus ZfcUser is a pretty bad example as far as clean and performant service-configuration is concerned
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