Thanks, Josh.
onActivate() solve the problem. I thought this method only get called for an
action request, not for a page render request.
Apparently, I am wrong. I think it should be documented at the following
"Page Lifecycle" guide.
http://tapestry.apache.org/tapestry5/tapestry-core/guide/lifecycle.html
Cheers,
Jeffrey
Josh Canfield-2 wrote:
>
>>
>> I am looking for the best way to initialize a session variable(@Persist)
>> in
>> a page render request once, so I could access it in the next action
>> request.
>>
>>
> I can't tell you why pageAttached doesn't work (haven't tried it) but you
> can use onActivate, or if it's for a form onPrepare.
>
> Josh
>
> On Nov 19, 2007 12:15 PM, jeffrey ai <[EMAIL PROTECTED]> wrote:
>
>>
>> Hi Folks,
>>
>> I am looking for the best way to initialize a session variable(@Persist)
>> in
>> a page render request once, so I could access it in the next action
>> request.
>>
>> I tried to put the logic into "pageAttached" method like below:
>> ====
>> @Persist
>> private xxx myVar;
>>
>> @SuppressWarnings(value = "unused")
>> private void pageAttached()
>> {
>> if (myVar == null) initializeVar();
>> }
>> ====
>>
>> It doesn't work as I expected. myVar is always null in "pageAttached"
>> method. It seems the "pageAttached" method is not supposed to mutate a
>> persistent variable.
>>
>> However, if I put this logic into some other place like below, it works
>> fine.
>> ====
>> @Persist
>> private xxx myVar;
>>
>> public String getSomeOtherVar()
>> {
>> if (myVar == null) initializeVar();
>> return someOtherVar;
>> }
>> ====
>>
>> Although it works, apparently, this is not a good place.
>> Is there a better place to do session variable initialization?
>> I believe it should not be put into constructor too because it will be
>> viewable to other sessions.
>>
>> Thanks,
>> Jeffrey Ai
>> --
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>> Nabble.com<http://nabble.com/>
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>>
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>
>
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