I could not understand clearly but one thing is for sure if you can do
something with intialize method the same thing could be done with detach
method. Look at the following examples:- still not solved mail back.
One approach:-
public class aa extends BasePage
{
ArrayList arraylist;
public void someMethod()
{
// did some thing with arraylist and changed the
value.
}
public void detach()
{
super.detach();
arraylist=null;
}
}
Second Approach:-
public class aa extends BasePage implements PageRenderListener
{
ArrayList arraylist;
public void initialization()
{
arrayList=new ArrayList();
}
public void pageBeginRender(PageEvent event)
{
initialization();
// other part of the code goes here.
}
public void detach()
{
super.detach();
initialization();
}
}
Third Approach(you said something like you want to change with every request
so I consider you are taking something from IRequestCycle):-
public class aa extends BasePage implements PageRenderListener
{
ArrayList arrayList;
public void initialization(IrequestCycle cycle)
{
arrayList=cycle.getAttribute("name") ;
}
public void pageBeginRender(PageEvent event)
{
initialization(getRequestCycle());
// other part of the code goes here.
}
public void detach()
{
super.detach();
arrayList=null;
}
}
documentation of detach method:-
detach
public void detach()Prepares the page to be returned to the pool.
Clears the changeObserved property
Invokes PageDetachListener.pageDetached(PageEvent) on all listeners
Invokes initialize() to clear/reset any properties
Clears the engine, visit and requestCycle properties
Subclasses may override this method, but must invoke this implementation
(usually, last).
Specified by:
detach in interface IPage
See Also:
IPageSource.releasePage(IPage)
Muralidhar Y
Software Engineer,
Adastrum technologies-Nikai groups,
EmiratesGroup-I.T Division,
Dubai, UAE.
Mobile : 00971-50-2256149.
http://www.adastrumtech.com
http://www.mercator.aero
(Keep Smiling. Be happy All The Time.)
-----Original Message-----
From: Tomáš Drencák [mailto:[EMAIL PROTECTED]
Sent: 17 September 2005 23:25
To: Tapestry users
Subject: Re: jwc files and annotations
Yes you're right, but what if I'd like to initialize properties to non
default values specific for each request. For instance I will get identifier
into persistent (userId) property in page and want some method to initialize
non persistent property (user).
2005/9/17, Muralidhar Y. <[EMAIL PROTECTED]>:
>
>
> Hi actually what I mean to say is by using detach method we can
> achieve the same thing. For example without initializing variables in
> initialize method you initialize them directly and set them to initial
> values in detach method. So when you initialize them directly they
> will be initialized and when going to the pool after the request, the
> detach method is called . So in detach method again you initialize
> them to initial values so when they go to pool they will have initial
values only. That's what I mean to say.
>
> In detach method we can detach the variable values and can initialize
> them to initial values. But when writing detach method you have to
> call
> super.detach() also. Is my explanation clear now or shall I explain
> with small example.
>
> One more approach is you write your own method something like
> Initialize and initialize the variables in that method and write the
> detach method and call
> super.detach() first and then call your method which is initializing
> the values. It does the same job as the old initialize method.
>
>
> Muralidhar Y
> Software Engineer,
> Adastrum technologies-Nikai groups,
> EmiratesGroup-I.T Division,
> Dubai, UAE.
> Mobile : 00971-50-2256149.
> http://www.adastrumtech.com
> http://www.mercator.aero
> (Keep Smiling. Be happy All The Time.)
>
> -----Original Message-----
> From: Tomáš Drencák [mailto:[EMAIL PROTECTED]
> Sent: 17 September 2005 21:39
> To: Tapestry users
> Subject: Re: jwc files and annotations
>
> Detach method is not deprecated, it shold be use to set properties to
> their initial state not initialization.
>
> 2005/9/17, Muralidhar Y. <[EMAIL PROTECTED]>:
> > What about detach method. Is it also depricated? i am not sure but
> > have a look at detach method. It does the same job.
> >
> >
> > Muralidhar Y
> > Software Engineer,
> > Adastrum technologies-Nikai groups,
> > EmiratesGroup-I.T Division,
> > Dubai, UAE.
> > Mobile : 00971-50-2256149.
> > http://www.adastrumtech.com
> > http://www.mercator.aero
> > (Keep Smiling. Be happy All The Time.)
> >
> > -----Original Message-----
> > From: Nick Stuart [mailto:[EMAIL PROTECTED]
> > Sent: 17 September 2005 16:32
> > To: Tapestry users; [EMAIL PROTECTED]
> > Subject: Re: jwc files and annotations
> >
> > In tapestry 4 you should use the pageBeginRender method and
> > implement the PageBeginRenderListener. You should be able to
> > initialize any page properties you want here.
> >
> > There is also a coresponding pageEndRender and PageEndRenderListener
> > but I dont think its used quite as much, but its there.
> >
> > -Nick
> >
> > On 9/17/05, Tomáš Drenčák <[EMAIL PROTECTED]> wrote:
> > > Yes initialize method is good and even its name sounds like it's
> > > initializing smth. I have used it in tapestry 3 but now it is
> > > deprecated. Is there an alternative method to initialize?
> > >
> > > 2005/9/17, Muralidhar Y. <[EMAIL PROTECTED]>:
> > > >
> > > > hi some times I got error when I am not passing IRequestCycle as
> > > > parameter to listener method.
> > > >
> > > > To initialize the parameters there is initialize method you also
> > > > can have a look at detach method and see.page begin render is ,
> > > > if you want to do something before any component renders itself.
> > > > Page validate is if you want to do any validations like user is
> > > > authenticated or not and any other page validations you can use it.
> > > >
> > > >
> > > > Muralidhar Y
> > > > Software Engineer,
> > > > Adastrum technologies-Nikai groups, EmiratesGroup-I.T Division,
> > > > Dubai, UAE.
> > > > Mobile : 00971-50-2256149.
> > > > http://www.adastrumtech.com
> > > > http://www.mercator.aero
> > > > (Keep Smiling. Be happy All The Time.)
> > > >
> > > > -----Original Message-----
> > > > From: Alan Chandler [mailto:[EMAIL PROTECTED]
> > > > Sent: 16 September 2005 22:49
> > > > To: [email protected]
> > > > Subject: Re: jwc files and annotations
> > > >
> > > > On Friday 16 September 2005 18:29, Tomáš Drenčák wrote:
> > > > > Thanks a lot.
> > > > >
> > > > > Another question... You are using pageValidate to set up
> > > > > thisPerson property. I'm still little bit confused about page
> > initialization.
> > > > > What are pageBeginRender, pageValidate and prepareForRender for?
> > > > > Where to initialize e.g. thisPerson from passed personId
> > > > > parameter? I've used pageBeginRender, lazy initialization, but
> > > > > which method is specially designed for this purpose?
> > > >
> > > >
> > > > I must admit, this was a bit trial and error.
> > > >
> > > > I pass the personId parameter via the following code in another
> > component.
> > > >
> > > >
> > > > @InjectPage("Details")
> > > > public abstract Details getDetailsPage();
> > > >
> > > > public IPage doShowDetails(int personId) {
> > > > Details details = getDetailsPage();
> > > > details.setPersonId(personId);
> > > > return details;
> > > > }
> > > > }
> > > >
> > > > Where this code gets set up in the html template for this
> > > > component as
> > > >
> > > > <div class="surname">
> > > > <span jwcid="@DirectLink"
> > > > listener="listener:doShowDetails"
> > > > parameters="ognl:person.id"
> > > > ><span jwcid="@Insert"
> > > > value="ognl:person.surname"
> > > > >Chandler</span></span> </div>
> > > >
> > > >
> > > > I think PageBeginRender failed (thinking back to when I
> > > > orginally had
> > it
> > > > here) because there seems to be a validation phase of the page
> > > > before
> > then,
> > > > and I had not set up the record, and had null pointer exceptions.
> > > >
> > > > I think the page initialisation failed because the setPersonId
> > > > call
> > hadn't
> > > > happened (maybe - difficult to remember now) the initialisation
> > > > got
> > called
> > > > when I did the first call to getDetailsPage in the listener above.
> > > >
> > > > --
> > > > Alan Chandler
> > > > http://www.chandlerfamily.org.uk
> > > >
> > > > ----------------------------------------------------------------
> > > > --
> > > > --- To unsubscribe, e-mail:
> > > > [EMAIL PROTECTED]
> > > > For additional commands, e-mail:
> > > > [EMAIL PROTECTED]
> > > >
> > > >
> > >
> >
> >
>
>
