Component Event Context, ValueEncoder & Lifecycle

[Stefan <st...@wammel.com>]

Hi,

i'm currently writing my first component, which should work like this  
one : http://wiki.apache.org/tapestry/Tapestry5HowToCreateASimpleGraphComponent

Everything works fine so far, but:

I have to pass some complex data structures (encapsulated in objects)  
to the component,
doing so:

In the page template:
<t:myComp context="myDataStructure" />

In the components beginRender method:
void beginRender(MarkupWriter writer) {	
	Link lnk = resources.createEventLink(EVENT_NAME, context);
	
	// should render this: <embed type="image/svg+xml" src="..."  
width="280"height="280">
	writer.element("embed", "type", "image/svg+xml", "width",
				width, "height", height, "src", lnk);
	resources.renderInformalParameters(writer);
}

And at least, the corresponding action:
public StreamResponse onRenderGraph(Object... params) {
	// the params object now should be the passed myDataStructure
	//... rendering stuff
}


This works fine so far, but some things are too unclear to me:
the generated eventlink looks horrible:
"/somepage.component.action/org.localhost.something.package.MyStructure 
$12345"
Is there a way to use a custom ValueEncode to generate a better url?
I do not want to provide my package structure to the client ;)

And, more important to me is to know something about the lifecycles.
How long and "where" life these "passed objects"?

Thanks,
Stefan

Re: Component Event Context, ValueEncoder & Lifecycle

["Thiago H. de Paula Figueiredo" <th...@gmail.com>]

Em Wed, 22 Jul 2009 13:57:16 -0300, Stefan <st...@wammel.com> escreveu:

> Hi,

Hi!

> void beginRender(MarkupWriter writer) {	
> 	Link lnk = resources.createEventLink(EVENT_NAME, context);

You should encode the event context before passing it to  
createEventLink(). ;)
Then, in your event handler method, you decode the context.

> 	// should render this: <embed type="image/svg+xml" src="..."
> width="280"height="280">
> 	writer.element("embed", "type", "image/svg+xml", "width",
> 				width, "height", height, "src", lnk);

SVG! Cool! :)

> And, more important to me is to know something about the lifecycles.
> How long and "where" life these "passed objects"?

The passed objects are put in the link URL and not store anywhere else.

-- 
Thiago H. de Paula Figueiredo
Independent Java consultant, developer, and instructor
http://www.arsmachina.com.br/thiago

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