Page activation context question

[Yura Tkachenko <tr...@gmail.com>]

Hi All,

I've been reading chapter about "Page Activation Context" here:
http://tapestry.apache.org/tapestry5/tapestry-core/guide/pagenav.html. And I
have a question: can I pass using activation context more than one
parameter?

For example in help we have an example:

void onActivate(long productId) {
   setProductId(productId);
   loadProduct();
}

long onPassivate() {
  return getProductId();
}

Also it was mentioned onPassivate method should be like a mirror of
onActivate. Does it means I can't pass more than one parameter?
Another approach I tried is it create another Java Bean (wrapper object) and
simple try to pass this bean via activation context. In that case my
onActivate and onPassivate were:

void onActivate(PageWrapper wrappedData) {
        System.out.println("Activated with message: " + wrappedData);
        setWrapper(wrappedData);
    }

PageWrapper onPassivate() {
        System.out.println("Page is passivated.");
        return getWrapper();
}

As the result I got exception. From URL I understood that Typestry during
passing parameter via activation context is converting it to get request. In
my case for wrapped object URL was:
http://localhost:8080/t5first/second/com.packtpub.t5first.utils.PageWrapper%40307efc
After looking to that URL I realized that T5 just call toString of passed
object :-)
So my additional questions:
1) Why not allow to user pass his own objects (POJO)?
2) Why not pass data via HTTP POST? Because as far as I know HTTP (at least
some browsers and http servers) has some limitations to the length of URLs.
Besides sooner or later some smart users will pass string with a  few Kbytes
and the page will get wrong data (truncated).

Thanks,
Yura.

Thanks,
Yura.

Re: Page activation context question

[Bill Holloway <bi...@gmail.com>]

Your onActivate method can also take varargs, as in

void onActivate (String... args)
{
     _firstObj = restoreFirstObj(args[0]);
     if (args[1] != null) _secondObj = restoreSecondObj(args[1]);
     ...
}

String[] onPassivate ()
{
     List<String> args = new ArrayList<String>();
     args.add (_firstObj.toString());
     if (_secondObj != null) args.add (_secondObj.toString());
     ....
     return (String[]) args.toArray();
}

On Sun, Mar 23, 2008 at 12:11 AM, Yura Tkachenko <
try.tapestry.again@gmail.com> wrote:

> Hi All,
>
> I've been reading chapter about "Page Activation Context" here:
> http://tapestry.apache.org/tapestry5/tapestry-core/guide/pagenav.html. And
> I
> have a question: can I pass using activation context more than one
> parameter?
>
> For example in help we have an example:
>
> void onActivate(long productId) {
>   setProductId(productId);
>   loadProduct();
> }
>
> long onPassivate() {
>  return getProductId();
> }
>
> Also it was mentioned onPassivate method should be like a mirror of
> onActivate. Does it means I can't pass more than one parameter?
> Another approach I tried is it create another Java Bean (wrapper object)
> and
> simple try to pass this bean via activation context. In that case my
> onActivate and onPassivate were:
>
> void onActivate(PageWrapper wrappedData) {
>        System.out.println("Activated with message: " + wrappedData);
>        setWrapper(wrappedData);
>    }
>
> PageWrapper onPassivate() {
>        System.out.println("Page is passivated.");
>        return getWrapper();
> }
>
> As the result I got exception. From URL I understood that Typestry during
> passing parameter via activation context is converting it to get request.
> In
> my case for wrapped object URL was:
>
> http://localhost:8080/t5first/second/com.packtpub.t5first.utils.PageWrapper%40307efc
> After looking to that URL I realized that T5 just call toString of passed
> object :-)
> So my additional questions:
> 1) Why not allow to user pass his own objects (POJO)?
> 2) Why not pass data via HTTP POST? Because as far as I know HTTP (at
> least
> some browsers and http servers) has some limitations to the length of
> URLs.
> Besides sooner or later some smart users will pass string with a  few
> Kbytes
> and the page will get wrong data (truncated).
>
> Thanks,
> Yura.
>
> Thanks,
> Yura.
>