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Use of remote service client API with non OSGI-services [message #1485606]

Mon, 24 November 2014 11:32

Thomas Elskens

Messages: 159
Registered: September 2014
Location: Brussels - Belgium

Senior Member

Hello,

In this (already a bit older) blogpost (http://eclipseecf.blogspot.be/2010/01/soap-rest-and-ecf-remote-services.html) I found out about the existence of org.eclipse.ecf.remoteservice.client API, which should enable an OSGI-based client to consume restful services as if they were OSGi (ideally declarative) services.

I would like to try this out in a RCP application, but apart from javadoc I didn't find any examples on how to get started with this client-library : all examples I've found have clients interacting with "authentic" OSGI service providers.

Any hints, of code example on this ?

Thanks a lot,

Thomas Elskens

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Re: Use of remote service client API with non OSGI-services [message #1486111 is a reply to message #1485606]

Mon, 24 November 2014 20:47

Scott Lewis

Messages: 1038
Registered: July 2009

Senior Member

Hi Thomas,

Your questions about the client API are rather timely. Why timely? Because although we have tutorials and examples that show how to create custom providers...e.g.

http://wiki.eclipse.org/Tutorial:_Creating_a_RESTful_Remote_Service_Provider

we do *not* yet have a tutorial/examples that show how to create a client-only provider to interact with a non-OSGi hosted service (e.g. an existing REST, SOAP, or other service). In October, I actually have proposed that I create such a tutorial myself on the ECF dev mailing list:

http://dev.eclipse.org/mhonarc/lists/ecf-dev/msg07317.html

As you can see by reading the responses to this thread, there were some really good ideas of an existing service that could be used for this example/tutorial, but as of right now I haven't actually decided what service I would focus on for the example/tutorial.

BTW, there was an example client that interacted with an old version of the Twitter service some years ago (before they changed the twitter authentication) in ECF test code here:

http://git.eclipse.org/c/ecf/org.eclipse.ecf.git/tree/tests/bundles/org.eclipse.ecf.tests.remoteservice.rest/src/org/eclipse/ecf/tests/remoteservice/rest/twitter

One issue for me doing this work immediately is that I don't currently have support (read $$) for work on ECF, and so can't dedicate as much time to it as I would like.

But to summarize: I am thinking of working on such a tutorial/example, but need to figure out

1) How I can dedicate some paid work time to such an effort
2) Which existing service to create a client provider for
3) Get some assistance from other in the ECF community in creating the examples and tutorial

If you have ideas or could contribute to any of 1-3 then it certainly could move things along. You might want to jump in on the ecf-dev thread discussing which existing service to us (2). To join the ecf-dev mailing list go here:

https://dev.eclipse.org/mailman/listinfo/ecf-dev

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Re: Use of remote service client API with non OSGI-services [message #1490655 is a reply to message #1486111]

Fri, 28 November 2014 10:19

Thomas Elskens

Messages: 159
Registered: September 2014
Location: Brussels - Belgium

Senior Member

Hello,

I proposed a little idea on the mailing list. But in the meanwhile, I don't quite understand the API of the remote client.

As far as my understanding goes :

First I've to instantiate a RestClientContainer with the targetID of the webservice server
then I register some Callables with it and save this registration in a IRemoteServiceRegistration
I have to instantiate a RestClientService. All methods of this class are protected, so I have to extend it. Parameters of the constructor are the container and ServiceRegistration previously instantiated.

So far so good, I guess.

The main method of interest in the RestClientService is invokeRemoteCall(IRemoteCall call, IRemoteCallable callable). Here I'm stuck : the first argument can be created with RestCallFactory, but what about the callable ?
The only way I can think of getting to a callable at this point is to write

this.invokeRemoteCall(call, this.registration.lookupCallable(call))

but this doesn't seem very meaningful ?

Or am I mistaken alltogether about the way I should use the class RestClientService ?

Thomas Elskens

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