ServiceSelector: it's possible to get an Enumeration?

[tr...@units.it]

Hi to all,

I'm writing a class whitch implements CronJob for use with the  
cocoon-cron-block.

In the execute method I have to perform a select for any datasource  
defined in cocoon.xconf.

I've written:

public void execute(String name) {

	ServiceSelector selector=null;

         try {
		selector = (ServiceSelector)  
manager.lookup(DataSourceComponent.ROLE+"Selector");

/*  I NEED HELP HERE */

		this.manager.release(selector);

	} catch (ServiceException e) {
		e.printStackTrace();
	}
}

selector is really an instance of WrapperServiceSelector. Inside the  
object there is an ExtendedComponentSelector where a HashTable has an  
entry for each datasource deined in cocoon.xconf.

But I do not find any way to get the keys out. If I know the  
datasource name I can perform a select, of course. But I *do not* know  
the datasource names!

Can anybody help me?

Otherwise I could define datasources in a separate xml file, include  
it in cocoon.xconf, read the same file form my class with an  
InputStream to get the datasource names and finally select the  
connection. But I don't like this "solution" very much.

Thank's for any help,

bye

romano

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Re: ServiceSelector: it's possible to get an Enumeration?

[Joerg Heinicke <jo...@gmx.de>]

On 17.05.2007 17:47, trampus@units.it wrote:

> selector is really an instance of WrapperServiceSelector. Inside the 
> object there is an ExtendedComponentSelector where a HashTable has an 
> entry for each datasource deined in cocoon.xconf.
> 
> But I do not find any way to get the keys out.

Neither ServiceSelector [1] nor the older ComponentSelector [2] (the 
actual interfaces) support this feature. You probably need to extend the 
classes in use yourself or try to work with introspection. If you have a 
look at the super class of ExtendedComponentSelector, the 
ExcaliburComponentSelector [3, 4], you can see a protected method 
getComponentHandlers(). The keys in this map are the actual hints used 
for ComponentSelector.select(hint).

Hope this helps,

Joerg

[1] 
http://excalibur.apache.org/apidocs/org/apache/avalon/framework/service/ServiceSelector.html
[2] 
http://excalibur.apache.org/apidocs/org/apache/avalon/framework/component/ComponentSelector.html
[3] 
http://excalibur.apache.org/apidocs/org/apache/avalon/excalibur/component/ExcaliburComponentSelector.html
[4] 
http://svn.apache.org/viewvc/excalibur/trunk/deprecated/component/src/java/org/apache/avalon/excalibur/component/ExcaliburComponentSelector.java?revision=506259&view=markup

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