Re: Export data from Lenya

Andrey Volkov schrieb:
> O, thank you, I see. I did some progress, but I have one more question. 
> How should parameters be passed to csv generator?
> I describe the whole picture below.
> 
> I defined a new component-instance. It ties the usecase with the pipeline.
>               <component-instance logger="lenya.admin" 
> name="admin.logs.export" class="ksa.usecases.Logs">
>             <view uri="cocoon://modules/administration/auditlogs.csv"/>
>         </component-instance>
> 
> The pipeline in sitemap.xmap:
>            <map:pipeline pattern="auditlogs.csv">
>           <map:generate type="auditlogs" src="auditlogs"/>
>           <map:serialize type="text"/>
>       </map:pipeline>
> 
> So, it calls 'auditlogs' generator that is defined in root's sitemap.xmap:
> <map:generator name="auditlogs" label="content,data" 
> logger="sitemap.generator.auditlogs" pool-grow="2" pool-max="16" 
> pool-min="2" src="ksa.generators.AuditLogsGenerator"/>
> 
> So, the question is how to pass parameters from web page to the 
> generator? Could someone give a piece of advice?

The easiest way is to access the request parameters directly in the 
generator:

   Request request = ObjectModelHelper.getRequest(objectModel);
   String foo = request.getParameter("foo");

If you want to decouple the generator from the HTTP processing (SoC), 
you can pass the parameters from the sitemap:

   <map:generate type="auditlogs" src="auditlogs">
     <map:parameter name="foo" value="{request-param:foo}"/>
   </map:generate>

   String fooValue = parameters.getParameter("foo");


BTW, this is rather a Cocoon-related subject than a Lenya-related one.

HTH,

-- Andreas



> Maybe there can be another way. I would be glad to hear about it.
> 
> On Tue, Sep 15, 2009 at 4:03 PM, Andreas Hartmann <[email protected] 
> <mailto:[email protected]>> wrote:
> 
>     Andrey Volkov schrieb:
> 
>         Could you describe in more details where I should define
>         serializer and how to redirect output from a usecase to it?
> 
> 
>     http://lenya.apache.org/docu20/reference/usecase-framework/usecase-framework-overview.html#N101BC
> 
>     "If you don't want to display a form, but output arbitrary XML,
>     text, an SVG-generated image or something like that, you can use a
>     uri attribute instead of the template attribute."
> 
>     In your case that would be a cocoon:// URI which calls a pipeline in
>     your module that ends with the text serializer.
> 
>     HTH,
> 
>     -- Andreas
> 


-- 
Andreas Hartmann, CTO
BeCompany GmbH
http://www.becompany.ch
Tel.: +41 (0) 43 818 57 01