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POPHP OOP :: getting confused about Factory class and passing objects to constructors
 

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  1. POPHP OOP :: getting confused about Factory class and passing objects to constructors
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    <p>I am trying ensure that my app enforces Dependency Injection but I'm getting into a bit of a pickle...</p> <pre><code>class Factory { public $sessionId; public $config; public $lib; function __construct() { $this-&gt;getSessionId(); } function getSessionId() { if (isset($_COOKIE['sk'])) { $this-&gt;sessionId = trim($_COOKIE['sk']); } else { $sm = $this-&gt;createSessionManager(); $this-&gt;sessionId = trim($sm-&gt;getNewKey()); setcookie("sk", $this-&gt;sessionId, time() + 3600 * 3, "/"); setcookie("vb", 0, 0, "/"); } } function createBasket() { $t = $this-&gt;createTicket(); $co = $this-&gt;createContribution(); $cfg = $this-&gt;createConfig(); $basket = new Basket($t, $co, $cfg); return $basket; } function createTicket() { $sm = $this-&gt;createSessionManager(); $cfg = $this-&gt;createConfig(); $ticket = new Ticket($this-&gt;sessionId, $sm, $cfg); return $ticket; } </code></pre> <p>.... }</p> <p>First of all, I'd like to know if I'm approach thing in the right way. An example viewer page - called by a browser - would be:</p> <pre><code>function __autoload($class_name) { include 'classes/' . $class_name . '.class.php'; } $factory = new Factory; $performance = $factory-&gt;createPerformance(); $pno = (isset($_GET['pno']) ? $_GET['pno'] : 0); print $performance-&gt;displayHtmlListing($pno); </code></pre> <p>My other question/problem is related to how I prevent a 'catch 22' situation where objectA requires objectB that - in rare circumstances - will need objectA.</p> <p>An example, in Factory class:</p> <pre><code>function createParser() { $am = $this-&gt;createApiManager(); $parser = new Parser($am); return $parser; } </code></pre> <p>The parser object is passed an object into constructor to satisfy its dependencies in the business logic. Its job is to read requests for files and if a certain condition is met, it needs to grab hold of the $am object (APIManager) and fire off a request to the API. The problem is that APIManager passes <em>all</em> requests through the Parser object, and I can't easily remove the dependency on Parser without breaking business rules or adding redundant conditional code.</p> <p>Wondering if anyone had some thoughts on how to get around this issue?</p> <p>Thanks, James</p> <h1>UPDATE:</h1> <p>Bit more info on the dependency problem:</p> <p>ApiManager.caller() - it's job is to go off to an API URL send GET variables, and retrieve results.</p> <p>This caller() method is used by nearly all classes (perhaps a good reason for it to be in super class and extend the classes that need it?). </p> <p>Part of the caller() responsibility is to check what API calls are being made. If a certain condition is met, it needs to stop and make a call to SessionManager.getNewSession() which goes off to the same API and retrieve a value. Only when this is complete can the original request ( in caller() ) be completed.</p> <p>The problem is that SessionManager.getNewSession() also uses caller().</p>
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