Magento Get arg_name in observer - magento

Question

i can set up a observer to listen when one of the controller method tigger, however, i want to pass the parameter to the observer, how can i get the parameter in observer? arg_value
thanks a lot
<events>
<controller_action_predispatch_mycompany_mymodule_controllername_recalculation>
<observers>
<mycompany_mymodule>
<class>Mycompany_Mymodule_Model_Observer</class>
<method>processgo</method>
<args>
<arg_name>arg_value</arg_name>
</args>
</mycompany_mymodule>
</observers>
</controller_action_predispatch_mycompany_mymodule_controllername_recalculation>
</events>

Answer 1

Please try something like following
<events>
<event_to_observe>
<observers>
<observer_name>
<type>singleton</type>
<class>Namespace_Module_Model_ObserverClass</class>
<method>observerMethod</method>
<args>
<arg_name>arg_value</arg_name>
</args>
</observer_name>
</observers>
</event_to_observe>
</events>
<?php
/**
* Observer class
*/
class Namespace_Module_Model_ObserverClass {
/**
* Observer method
*
* #param Varien_Event_Observer $observer
* #return void
*/
public function observerMethod(Varien_Event_Observer $observer) {
$args = Mage::helper('ecmessenger')->getObserverArgs($observer, get_class($this), __FUNCTION__);
Mage::log($args, null, 'observer.log');
}
}
Make sure here Mage::helper('ecmessenger') is the helper that you need to create and specify in config.xml
Let me know if you have any query