Interesting idea, I plan to try it... I've had occasional difficulties
getting the built-in persistence methods to work just right. If I use
flash, the message doesn't always survive the redirect, say if I return null
from onSuccess().
But I'm curious about the original statement, "Generics are dangerous in
SessionState, in fact, SessionState is dangerous with anything but a custom
type." That's news to me, so I must be missing something.
On Thu, Jan 6, 2011 at 11:38 AM, Thiago H. de Paula Figueiredo <
thiag...@gmail.com> wrote:
> This looks like an application-wide problem, so I'd create a service that
> stored the messages in the Session with two methods. One would get the
> messages and removes them from the Session, remove them from the Session and
> then return them. The other one would store these messages into the Session.
>
>
>
> On Thu, 06 Jan 2011 14:25:08 -0200, Pierce Wetter <pie...@paceap.com>
> wrote:
>
> What's the best practice for pushing and displaying "flash" messages?
>> It's easy enough for me to add an variable for this:
>>
>> @Persist("flash")
>> List<String> messages;
>>
>> along with associated display HTML to my layout component, but then
>> getting access to the current layout component from various places sounds
>> tedious. Plus it probably wouldn't work anyways, because the flash
>> persistence is by page & nested component id, and so on. So I guess that
>> means SessionState.
>>
>> Naively, that would look like this:
>>
>> @SessionState(create=false)
>> List<String> messages;
>>
>> Except Generics are dangerous in SessionState, in fact, SessionState is
>> dangerous with anything but a custom type. So that means:
>>
>> @SessionState(create=false)
>> Messages messages;
>>
>> With the Messages object wrapping the list. Presumably Messages has to be
>> serializable. I would have to put an @AfterRender in whatever draws the
>> messages to clear it.
>>
>> Seems simple enough, if tedious. But I was wondering if anyone had come up
>> with a solution they were especially proud of.
>>
>> Pierce
>>
>
>
> --
> Thiago H. de Paula Figueiredo
> Independent Java, Apache Tapestry 5 and Hibernate consultant, developer,
> and instructor
> Owner, Ars Machina Tecnologia da Informação Ltda.
> Consultor, desenvolvedor e instrutor em Java, Tapestry e Hibernate
> Coordenador e professor da Especialização em Engenharia de Software com
> Ênfase em Java da Faculdade Pitágoras
> http://www.arsmachina.com.br
>
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