Hello,
we are a small group of developers creating a multilayer system that
will process databases and map applications. We decided to build
user-interface layer using Tapestry, and business-logic layer using
Spring. The specification of the project requests separating business
logic layer from user interface layer.
System architecture conforms, from our point of view, to MVC
(Model-View-Controller) design pattern. Spring components and business
logics create Model (data and metadata). Tapestry serves as interpreter
for the Model, and it creates View. Model is thus transferred from
business logic (Controller) to Tapestry components (View); it contains
data and metadata in the form of XML document. Model interpretation
provided by some components of Tapestry (eg. form or table) would enable
us generate from received data and metadata dynamic outputs.
Here we face difficulties. We tried to create dynamic Template and
Specification using Delegate class (Template-Source-Delegate,
Specification-Resolver-Delegate). But at this very moment neither page
instance exists, nor exist parameters, that should be passed between
pages in RequestCycle. We use PrepareForRender to retrieve our Model
from business logic layer.
Is there anybody to give us a piece of advice? Has Tapestry a solution
how such dynamic components could be created? (those that use data
passed by another layer) Can Delegate Template use parameters from
RequestCycle? Or can Delegete be invoked after PrepareForRender has been
processed?
We look forward to hearing your advice.
Thanks
Jirka and Pavel
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