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POphp dependency injection with a container
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copied!<p>I'm developing a PHP framework for educational purposes. I have learned a lot since I started it.</p> <p>I've decided how I'm going to deal with dependencies. I'm create a simple DI Container.</p> <hr> <p>My <strong>first</strong> question is not about the DI Container itself, but how to inject objects that are created outside (before the DI Container).</p> <p><strong>Q:</strong> In the example: I am calling <code>container->manualAdd('_logger', $logger);</code>. Is there another way to accomplish this? Am I breaking the idea of DI Container?</p> <hr> <p>My <strong>second</strong> question is about hooking functions. So when in bootstrap all objects are instantiated, objects by it selves can now begin to function.</p> <p><strong>Q:</strong> In the example: I'm creating an EventDispatcher. Whoever needs to do something either on <code>doneBuild</code> or <code>beforeTerminate</code>, is injected with <code>BootstrapEventDispatcher</code>. Is there another way to do this?</p> <p>I begin to think <code>EventDispatcher</code> is overkill (for <code>bootstrap</code> only), and maybe implement something like: <a href="http://ellislab.com/codeigniter/user-guide/general/hooks.html" rel="nofollow">CodeIgniter:Hooks</a></p> <p>Any help is appreciated.</p> <p>Example bootstrap (pseudo-code):</p> <pre><code>function bootstrap($file = 'file.xml'){ $logger = new Logger(); $logger->log('bootstrap: init'); $dispatcher = new BootstrapEventDispatcher($logger); $container = new DIContainer(new ConfigReader($file), $logger); $container->manualAdd('_logger', $logger); $container->manualAdd('_bootstrap_event_dispatcher', $dispatcher); $container->build(); $dispatcher->doneBuild(null, new EventArgs()); $dispatcher->beforeTerminate(null, new EventArgs()); $logger->log('bootstrap: terminate'); } class DIContainer{ public function build(){ //read xmls and create classes, etc. $this->logger->log('DIContainer: creating objects: {objects}'); } } </code></pre> <p>Example of an xml:</p> <pre><code> <services> <service id="simple_class" class="SimpleClass"></service> <service id="complex_class" class="ComplexClass"> <argument type="service" id="simple_class" />  <argument type="service" id="_logger" />  <argument type="service" id="_bootstrap_event_dispatcher" />  </service> </services> </code></pre> <p>Example of ComplexClass:</p> <pre><code>class ComplexClass{ public function __construct(SimpleClass $simpleClass, BootstrapEventDispatcher $dispatcher, Logger $logger){ $this->simpleClass = $simpleClass; $this->logger = $logger; $dispatcher->onDoneBuild(array($this, 'onBootstrapDoneBuild')); } public function onBootstrapDoneBuild($obj, $args){ //do something. $this->logger->log('complexclass: did something'); } } </code></pre>

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