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README Observer

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Dominik Liebler
2013-09-24 13:44:11 +02:00
parent 722218f1a2
commit 5633c8508c
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Observer/README.md Normal file
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# Observer
## Purpose
To implement a publish/subscribe behaviour to an object, whenever a "Subject" object changes it's state, the attached
"Observers" will be notified. It is used to shorten the amount of coupled objects and uses loose coupling instead.
## Examples
* a message queue system is observed to show the progress of a job in a GUI
## Note
PHP already defines two interfaces that can help to implement this pattern: SplObserver and SplSubject.

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Observer/UserObserver.php
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namespace DesignPatterns\Observer;
/**
* Observer pattern
*
* Purpose:
* to implement a publish/subscribe behaviour to an object, whenever a "Subject" object changes it's state, the attached
* "Observers" will be notified. It is used to shorten the amount of coupled objects and uses loose coupling instead
*
* Examples:
* - a message queue system is observed to show the progress of a job in a GUI
*
* PHP already defines two interfaces that can help to implement this pattern: SplObserver and SplSubject
*
* class UserObserver
*/
class UserObserver implements \SplObserver
{