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public interface SpringIntegration
The Spring framework has many different parts, from integration with Object Relational Mapping (ORM) and transaction management systems, to a Model View Controller (MVC) architecture.
If you are building a new application from scratch and/or you are trying to
modernize
the presentation layer of an existing application, most of Spring MVC is
inapplicable in the 'Smart GWT architecture'
. Specifically,
Smart GWT renders all
HTML on the client, and the server is responsible only for
retrieving data and enforcing business rules. This
means that Spring's ModelAndView and all
functionality related to retrieving and rendering Views is unnecessary in
Smart GWT.
Smart GWT only needs the Model, and provides methods to deliver that Model to Smart GWT
components
(the server side method DSResponse.setData()).
However, Spring's DispatchServlet, Handler chain, and Controller architecture is applicable to Smart GWT. See "Using Spring Controllers" below.
Existing Spring Application
As discussed under the general 'server integration'
topic, integrating Smart GWT into your
application involves finding a way to provide data
that fulfills the DSRequest
sent by Smart GWT components.
There are 2 approaches for integrating Smart GWT into an existing Spring application:
DSRequest
to beans managed by Spring, via
lookupStyle
:"spring". Return data to the browser by either
simply
returning it from your method, or via creating a DSResponse and calling DSResponse.setData()
(server-side method).
This is the easiest method and produces the best result. A Collection of Java
Beans, such
as EJB or Hibernate-managed beans, can be directly returned to Smart GWT as the result of
a DMI
method, without the need to create an intervening
+link{http://en.wikipedia.org/wiki/Data_transfer_object,Data
Transfer Object} to express
which fields should be delivered to the browser - instead, only the fields declared on
the
DataSource are returned to the browser (see
'dropExtraFields'
. In this integration scenario, the
majority of the features of the Smart GWT Server framework
still apply - see this
'overview'
.
RestDataSource
provides a
standard "REST" XML or JSON-based protocol you can implement,
or you can adapt generic
DataSource
to existing formats.
In some Spring applications, all existing Spring workflows can be made callable by Smart GWT with a generic View class capable of serializing the Model to XML or JSON, combined with a Controller that always uses this View. Consider the following Java anonymous class, which uses the Smart GWT JSTranslater class to dump the entire Spring Model as a JSON response.
new View() { public void render(Map model, HttpServletRequest request, HttpServletResponse response) throws IOException { final ServletOutputStream outputStream = response.getOutputStream(); response.setContentType("application/x-javascript"); outputStream.println(JSTranslater.get().toJS(model)); outputStream.close(); } public String getContentType() { return "application/x-javascript"; } }
If you use this approach, you do not need to install the Smart GWT server, and can
'deploy'
Smart GWT as simple web content (JS/media/HTML files). If you
are
already familiar with how to generate XML from objects that typically appear in your
Spring Models, this may be the
easiest path.
Using Spring Controllers with Smart GWT DMI
You can create a Controller that invokes standard Smart GWT server request processing, including DMI, like so:
public class Smart GWTRPCController extends AbstractController { public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception { // invoke Smart GWT server standard request processing com.isomorphic.rpc.RPCManager.processRequest(request, response); return null; // avoid default rendering } }This lets you use Spring's DispatchServlet, Handler chain and Controller architecture as a pre- and post-processing model wrapped around Smart GWT DMI.
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