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POHelp with Dependency Injection in MVC app
 

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    <p>Zend Framework/Doctrine 2 application.:</p> <pre><code>/app /modules /blog /controllers /BlogController.php /domain /entities /services /PostService.php /repositories </code></pre> <p>PostService is responsible for basic CRUD opterations, dealing directly with entities and the EntityManager to abstract the business and persistence logic out of my controllers. </p> <p>If possible, I would like to keep my services as POPOs. What's the best way to access/inject the EntityManager in my service class? I'm new to DI, hence this question. The EntityManager is accessible as a bootstrap resource in my controllers.</p> <p>Should I just write a abstract class for services to access the EntityManager? Should I write a class to instantiate my services, injecting the EntityManager via the constructor/setter?... which would involve an interface for my services. Should I use a DI framework? If so, which one and how? </p> <p>Or is there another, better way to do this?</p> <p>I have done reading on dependency injection but still don't fully grasp it in this context.</p> <hr> <h2>Update (12th Jan 2011)</h2> <p>So this is my current working solution: I have an action helper called Resource, it is a helper for retrieving resources from the bootstrap, or you can manually added resources to it: <a href="http://pastie.org/1450851" rel="nofollow">http://pastie.org/1450851</a></p> <pre><code>$this-&gt;_helper-&gt;Resource('em'); // get EntityManager </code></pre> <p>Can someone please provide some insight into the performance impact of storing bootstrap resources locally within the helper class? Am I over doing it?<br> TODO: Refactor the resourcesMap out of the class.</p> <p>And I have an action helper for loading services: <a href="http://pastie.org/1450855" rel="nofollow">http://pastie.org/1450855</a><br> TODO: Add checks before attempting to load the service.</p> <p>Please provide some criticism on the above :)</p>
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    1. COFYI, I like the domain construct within each module. However, how do you envision cross-module entities to interact? Example: you also have a forum module and want to share a common User entity. Where does the User definition live and does each module have its own implementation?
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    2. COI suppose I would create an Account module and the User entity would live in there.
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