A website in OSGi that uses a REST web service in the background

Question

I spent many days trying to figure out how to add a site to OSGi.

I have a hava Web service launched with the Jetty extension to use Jetty as a connector. This feature provides various resources at multiple URLs.

But I would also like to have a small website running on the system that the user can access. I wanted to use some HTML, Javascript, CSS and provide the current status of the data using some graphs and images.

I assume that since Jetty is running in the background, I can deploy this site to Jetty and possibly call the server resources provided by Restlet in Javascript.

Apparently nothing worked except relaxation services.

My question is, can I add a WAB package and wait for it to work (since Jetty is running in the background)? Or is there a better way to add a site to OSGi? Or The only option that I have now, since you can return the HTML form as a view, add all the javascript code inside the HTML form and send it in response to a GET request (which I think is a mess).

Everything will work in raspberry pi, so that I can only have a small size. I am using Equinox, Restlet 2.3.0 and Jetty 9.2.6.

I would really appreciate if someone knows a link where I can get information on how to get at least a sample page in OSGi. I tried many, no luck.

Answer 1

, Apache Karaf (https://github.com/apache/karaf). Apache Karaf WebContainers : http://karaf.apache.org/manual/latest/users-guide/webcontainer.html

Answer 2

Jetty Restlet . , ( ) .

, Restlet . , , Restlet WAB-, .. .

:

• , Restlet OSGi. FrameworkListener, , ..... Restlet:

  private Component component;
  
  public void start(BundleContext bundleContext) throws Exception {
      bundleContext.addFrameworkListener(new FrameworkListener() {
          component = new Component();
          (...)
          component.start();
      });
  }
  
  public void stop(BundleContext bundleContext) throws Exception {
      component.stop();
  }
  

• , , , Restlet. OSGi-, Restlet, .

  ServiceReference[] restletAppRefs = bundleContext.getServiceReferences(
       "restletApplication",
                  null);
  
  if (restletAppsRefs != null) {
      for (ServiceReference restletAppRef : restletAppsRefs) {
          RestletApplicationService descriptor
               = (RestletApplicationService) bundleContext
                 .getService(serviceReference);
          String path = descriptor.getPath();
          Application restletApplication = descriptor.getApplication();
  
          // Register the application against the component
          (...)
      }
  }
  

  try {
      VirtualHost virtualHost = getExistingVirtualHost(
                     component, hostDomain, hostPort);
      if (virtualHost == null) {
          virtualHost = new VirtualHost();
          virtualHost.setHostDomain(hostDomain);
          virtualHost.setHostPort(hostPort);
  
          component.getHosts().add(virtualHost);
      }
  
      Context context = component.getContext().createChildContext();
      virtualHost.setContext(context);
  
      virtualHost.attachDefault(application);
  
      component.updateHosts();
  
      application.start();
  } catch(Exception ex) {
      (...)
  }
  

• OSGi. , OSGi.

  bundleContext.addServiceListener(new ServiceListener() {
      public void serviceChanged(ServiceEvent event) {
          if (isServiceClass(event, RestletApplicationService)) {
              int type = event.getType();
  
              if (type == ServiceEvent.REGISTERED) {
                  // Register the Restlet application against the component
              } else if (type == ServiceEvent.UNREGISTERING) {
                  // Unregister the Restlet application
              }
          }
      }
  });
  

, , Thierry

Answer 3

- OSGi , . OSGi, :

• - WAB. , OSGi. , - Jetty , , OSGi .

org.apache.felix.http.jetty WAB. 2.2.2 1,3 Jetty. (, Pax-Web, Karaf, Jetty)

• - OSGi Http ( , (, Felix). org.osgi.service.http.HttpService.registerResources() .

, , Restlet OSGi http, Jetty.

Jetty . Jetty, , . Jetty, , Restlet Jetty. .