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Trismegiste 2013-05-11 16:20:55 +02:00
parent 1d99a9e65a
commit 22dbd54cbb
1 changed files with 10 additions and 4 deletions
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Facade/Computer.php
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@ -12,17 +12,19 @@ namespace DesignPatterns\Facade;
* *
* The first goal is to reduce coupling and folow the Law of Demeter. * The first goal is to reduce coupling and folow the Law of Demeter.
* *
* A Facade is meant to decouple a client and a sub-system with * A Facade is meant to decouple a client and a sub-system by embedding
* many (but sometimes just one) interface, and of course to reduce complexity. * many (but sometimes just one) interface, and of course to reduce complexity.
* *
* 1. A facade does not forbid you the access to the sub-system * 1. A facade does not forbid you the access to the sub-system
* 2. You can (you shoud) have multiple facades for one sub-system * 2. You can (you should) have multiple facades for one sub-system
* *
* That's why a good facade has no "new" in it. If there are multiple creations * That's why a good facade has no "new" in it. If there are multiple creations
* for each method, it is not a Facade, it's a Builder or a * for each method, it is not a Facade, it's a Builder or a
* [Abstract|Static|Simple] Factory [Method] * [Abstract|Static|Simple] Factory [Method].
* *
* The best facade has no new and a constructor with interface-type-hinted parameters * The best facade has no new and a constructor with interface-type-hinted parameters.
* If you need creation of new instances, use Factory as argument.
*
*/ */
class Computer class Computer
{ {
@ -30,6 +32,10 @@ class Computer
protected $opsys; protected $opsys;
protected $bios; protected $bios;
/**
* This is the perfect time to use a dependency injection container
* to creaate an instance of this class
*/
public function __construct(BiosInterface $bios, OsInterface $os) public function __construct(BiosInterface $bios, OsInterface $os)
{ {
$this->bios = $bios; $this->bios = $bios;