Marcel
...just wondering, are you actually using GWT in an OSGi context (to
build a UI out of components)? I have a customer that wants to look
into that so I was wondering if you have any experiences you might
want to share here.
Yes we are - using Felix, and the normal Felix Http bundle. We're still
on the old jetty4 based one from a couple of revs back. It works very
well too.
Pretty standard model:
* we create a single "ui" bundle - which contains:
o the gwt-user.jar as an embedded jar
o the gwext.jar (we were using mygwt and gxt, but there's been
a license brew-ha-ha which has steered us away from this).
o the java compiled outputs
o the compiled output of the GWT compiler i.e. the "www" root
o our GwtServlet which serves up the JS, HTML etc. resources
o our Rpc server classes - which are lightweight layers that
wire themselves into our core service classes elsewhere in
the OSGi instance
* we still use my old mangen approach for manifests (have attached
an example below)
* we use service binder for our service wiring (also attached our
I think when we first started we had the usual "trace and analyse" what
HTTP resource requests we were getting, and how to resolve them in our
GwtServlet class. But it didn't prove too hard:
We mount our app at:
http:://localhost:8084/VtWebUi
Our "app entry point"
protected String baseUri = "/com.ascert.webui.vt.VtWebUi";
This matches what's in your GWT XML and HTML
<entry-point class="com.ascert.webui.vt.client.VtWebUi" />
<script type="text/javascript"
src="com.ascert.webui.vt.VtWebUi.nocache.js"></script>
In our servlet, we use the following properties:
public GwtServlet(ServiceBinderContext context)
{
this.context = context;
alias = getProperty("webui.uri", "/VtWebUi");
resourceFsBase =
context.getBundleContext().getProperty("webui.fs.resource.base");
...
I'll cover what resourceFsBase does in a moment
We mount the following aliases for RPC services and too resolve
resources
public void activate()
{
try
{
srvHttp.registerServlet(alias +
"/EnvironmentService", this.envSvc, new Hashtable(),
myContext);
srvHttp.registerServlet(alias + "/ClientService",
this.cliSvc, new Hashtable(), myContext);
srvHttp.registerResources(alias, "", myContext);
...
And then to resolve resources in our myContext instance
private class WebUiContext implements HttpContext
{
public URL getResource(String name)
{
if (name.equals("/"))
{
name = "/VtWebUi.html";
}
diag.debug("getResource: " + name);
URL retVal = null;
try
{
//allowing FS overriding useful for testing.
if (resourceFsBase != null && new
File(resourceFsBase + name).exists())
{
retVal = new URL("file:" + resourceFsBase +
name);
}
if (retVal == null)
{
retVal =
GwtServlet.class.getClassLoader().getResource("resources/www" +
baseUri + name);
}
In a normal running case resources are server from the
GwtServlet class loader by the last case. But resourceFsBase
let's us do a pre-emptive check and serve direct from the
filesystem. This is very handy for tweaking CSS layouts, since
it lets you change CSS resources and try how the look without a
recompile.
Think that's the essence of the wiring - the rest is pretty much vanilla
OSGi and GWT
Here's those other attachments
_bundle manifest:
_
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.6.5
Bundle-ClassPath: .,gwt-user.jar,gwtext.jar
Metadata-Location: metadata.xml
Bundle-Name: VtWebUI
Bundle-ManifestVersion: 2
Created-By: 1.6.0_03-b05 (Sun Microsystems Inc.)
Bundle-Activator: com.ascert.webui.vt.ServiceActivator
Bundle-Description: WebUI for VersaTest
Import-Package: com.ascert.tas.api, com.ascert.vt.testcase, javax.imag
eio, javax.servlet, javax.servlet.http, javax.xml.parsers, org.apache
.felix.servicebinder, org.apache.log4j, org.osgi.framework, org.osgi.
service.http, org.w3c.dom
Bundle-SymbolicName: com.ascert.webui.vt
Name: com/ascert/openosgi/mangen
Import-Package: org.osgi.service.http
mangen-rule-0: Ignore imports(org.springframework.*,junit.*,com.google
.gwt.core.ext.*,com.google.gwt.dev.*,com.google.gwt.util.tools,org.ap
ache.tapestry.util.text,org.eclipse.jdt.*)
mangen-rule-1: Ignore exports(javax.servlet,javax.servlet.http)
_sb metadata:_
<?xml version="1.0" encoding="UTF-8"?>
<bundle>
<instance class="com.ascert.webui.vt.GwtServlet">
<requires
service="org.osgi.service.http.HttpService"
filter=""
cardinality="1..1"
policy="dynamic"
bind-method="bindHttp"
unbind-method="unbindHttp"
/>
<requires
service="com.ascert.tas.api.TestRunnerService"
filter=""
cardinality="1..1"
policy="dynamic"
bind-method="bindTestRunner"
unbind-method="unbindTestRunner"
/>
</instance>
</bundle>
Good luck
-- Rob
Ascert - Taking systems to the Edge
[EMAIL PROTECTED]
+44 (0)20 7488 3470
www.ascert.com
