Re: [fw-mvc] Overriding the Zend_Controller_Front::getInstance()?

The problem is that Zend_Controller_Front is a singleton - once you call getInstance() using Zend_Controller_Front::getInstance() it statically stores a Zend_Controller_Front object for future calls. When you subclass the front controller, e.g. My_Controller_Front, it has no impact on any static stores so calling My_Controller_Front::getInstance() simply returns the very first Front Controller object called. This is fine, if you call your subclass first - but it's not if you used the original Zend_Controller_Front. To get around this, you can overload getInstance in your subclass to use a static $_instance var from your subclass - this will ensure My_Controller_Front always returns a My_Controller_Front object without fail.

Paddy

 

Pádraic Brady

http://blog.astrumfutura.com
http://www.survivethedeepend.com
OpenID Europe Foundation Irish Representative

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From: Yunfeng Xu <hywl51@gmail.com>
To: fw-mvc@lists.zend.com
Sent: Thursday, July 23, 2009 5:22:44 AM
Subject: [fw-mvc] Overriding the Zend_Controller_Front::getInstance()?

Hi,

When I read the official zend framework programmer's reference guide - 12.3.5. Extending the Front Controller, I got the following text at the bottom of the page:

Overriding the getInstance() method ensures that subsequent calls to Zend_Controller_Front::getInstance() will return an instance of your new subclass instead of a Zend_Controller_Front instance -- this is particularly useful for some of the alternate routers and view helpers.

I don't understand why Zend_Controller_Front::getInstance() will return an instance of my new subclass only if I overriding the getInstance()method, and where I should put the overriding code.

Please can someone give me some advise?

Thanks
Yunfeng