Thread: [ajax-user] Apollo design question

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Hi,

I was looking at Apollo (http://ajax.sourceforge.net/apollo/) and I
found it very useful for developing purposes.

My goal was to enhance the developing process of our web start
application. We don't want to deploy our web app after changing one row
of our code. Apollon does exactly that what we were looking for.

Except this point:
We don't want to use Apollo in our deployed system. The package shall
not be deployed with the rest of our application. In my development
environment I want to use the Apollo-JNLP-Services but in my Runtime-Env
I want to use the JNLP services by SUN. I started to program a
workaround that looks as follows:

public class WebStartHelper {

	private static Logger logger =
Logger.getLogger(WebStartHelper.class);

	public static Object lookup(String s) throws
UnavailableServiceException {
		try {
			Class apolloServiceManager =
Class.forName("apollo.ServiceManager");
			String methodName = null;
			if (s.equals(FileOpenService.class.getName())) {
				methodName = "lookupFileOpenService";
			}
			// add additional code here...

			if (methodName != null) {
				Method method =
apolloServiceManager.getMethod(methodName, null);
				Object result = method.invoke(null,
null);
				logger.debug("apollo.ServiceManager
successfully used");
				return result;
			} else {
				logger.debug("no method found");
			}
		} catch (ClassNotFoundException e) {
		} catch (SecurityException e) {
		} catch (NoSuchMethodException e) {
		} catch (IllegalArgumentException e) {
		} catch (InvocationTargetException e) {
		} catch (IllegalAccessException e) {
		}
		logger.debug("using " + ServiceManager.class.getName());
		return ServiceManager.lookup(s);
	}

}

Using WebStartHelper:

// ...
import javax.jnlp.FileOpenService;
// ...
// *** this throws a ClassCastException!
FileOpenService fos =
WebStartHelper.lookup(FileOpenService.class.getName());

The BIG PROBLEM is, that apollo.FileOpenService is NOT the same as or
extending the interface javax.jnlp.FileOpenService.

So my class WebStartHelper fails at the line marked with ***.

My question is:
- Why did you implement your own interfaces that are a copy of the
jnlp-Interfaces?
- Why did you remove the Method "Object lookup(String s)" from your
version of the ServiceManger?
- Is it possible to change the existing apollo classes so that my
workaround throws no ClassCastException?

And one last question in German:
Kann man auch auf deutsch in dieser Mailingliste schreiben? Ich brech
mir nämlich mit meinem schlechten Englisch ganz schön einen ab und
besonders besucht scheint die ML eh nicht zu sein ;-)???

--
Best regards,
Marcel Gleis

Netz-Profis GbR              Tel: 0231/3988072
Emil-Figge-Str. 80
44227 Dortmund               Web: http://www.netz-profis.de