llonely skrev:
Hi all,
Hi,
I am new on Tapestry and try to become familiar with it, mostly through this
forum and the official site. I am trying to migrate a simple servlet into
tapestry.
While this is a logical approach to trying out something new, Tapestry
generally works better if you rewrite your code instead of migrating -
so many things are done differently in Tapestry compared to servlets.
I find myself search for days for tasks that seem simple. Currently I am
trying to achieve the following:
a) Load some init parameters, located in web.xml. I want to (pre)initialize
them once and have access to them from all pages. In a simple servlet i load
them inside servlet's init() method using ServletConfig. How can I do in on
Tapestry?
I'd suggest using symbols for that:
http://tapestry.apache.org/tapestry5/tapestry-ioc/symbols.html
b) Similarly with above, I want to load a datasource (configured on tomcat),
only once and use it on all my pages. In a simple servlet I do a Context
lookup in init() method and have the datasource object available.
You should definitely create a service for that. If you expose a getter
to your datasource as part of the service interface you can use the
PropertyShadowBuilder to expose the datasource as its own service, ready
for easy injection into your pages:
http://tapestry.apache.org/tapestry5/tapestry-ioc/shadow.html
So to sum up the question is: how do I preload an object once, and have it
available
for all pages (not inside a session)?
Services. : )
I am using version 5.0.6
Thanks in advance
Hope this helps.
-Filip
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