[原创] Dynamic DataService registration in OSGi Container for Graniteds v1.1.0

[原创] Dynamic DataService registration in OSGi Container for Graniteds v1.1.0

In last entry(Adding OSGi support to graniteds v1.1.0), i talk about the OSGifition of Graniteds. Now i would like to add dynamic registration of Granite DataService by using annotation (@RemoteDestination).


Step1:
   Define two constants:
  

   public   static   final  String TOPIC_GDS_ADD_SERVICE  = " org/granite/ds/add/serviceClass " ;
    public   static   final  String SERVICE_CLASS = " serviceClass " ;

   Then,we modify the org.granite.config.flex.ServicesConfig.java
  
  

import org.osgi.service.event.Event;
import org.osgi.service.event.EventHandler;
public   class  ServicesConfig  implements  ScannedItemHandler,EventHandler{
      //
      //
      public   void  handleEvent(Event event) {
         if (event.getTopic().equals(TOPIC_GDS_ADD_SERVICE)){
          Class c = (Class) event.getProperty(SERVICE_CLASS);
           if (c != null )
            handleClass(c); // this method is already provided by this Class, we just call it
           else
           System.out.println( " Class NOT Found!! " );
        }
    }
 
  }

Step2:

   in the AMFServiceAdaptor.java I mentioned in the last entry
  
  

    BundleContext context;
     public  AMFServiceAdaptor(BundleContext context){
         this .context = context;
    }
    public   void  init(ServletConfig config) {
         try  {
             super .init(config);
            graniteConfig  =  GraniteConfig.loadConfig(getServletContext());
            servicesConfig  =  ServicesConfig.loadConfig(getServletContext());
            Dictionary < String, Object >  properties  =   new  Hashtable < String, Object > ();
            String[] topics  =   new  String[] { TOPIC_GDS_ADD_SERVICE};
            properties.put(EventConstants.EVENT_TOPIC, topics);
            context.registerService(EventHandler. class .getName(), servicesConfig, properties);
        }  catch  (ServletException e) {
            e.printStackTrace();
        }
    }

  
  
Step3:
   In the Activator we add:

Activator.java  
 

  Dictionary < String, Object >  properties  =   new  Hashtable < String, Object > ();
   properties.put(SERVICE_CLASS, TestService. class );
   ServiceReference eventAdminRef  =  context.getServiceReference(EventAdmin. class .getName());
    if  (eventAdminRef  !=   null ){
       EventAdmin admin = context.getService(eventAdminRef);
         if (admin != null ){
            admin.sendEvent( new  Event(TOPIC_GDS_ADD_SERVICE,properties));    
   }

  
TestService.java

 1  package  net.blogjava.gembin.domain.services.test;
 2 
 3  import  org.granite.messaging.service.annotations.RemoteDestination;
 4 
 5 
 6  @RemoteDestination(id = " testService " , service = " granite-service " ,channel = " my-graniteamf " , scope = " session " )
 7  public   class  TestService {
 8     
 9       public   void  test(){
10          System.out.println( "test it !!! " );
11      }
12 
13  }

Step4:
  Flex Part
 

                [Bindable]
                 private  var srv:RemoteObject  =   null ;
                 import  mx.messaging.ChannelSet;
                 import  mx.messaging.config.ServerConfig;
                 import  mx.rpc.remoting.mxml.Operation;
                 private  function testSend(): void {
                    srv  =   new  RemoteObject();
                    srv.endpoint  =  ServerConfig.getChannel( " my-graniteamf " ).endpoint;
                    srv.destination  =   " testService " ; 
                    srv.channelSet  =   new   ChannelSet(); 
                    srv.channelSet.addChannel(ServerConfig.getChannel( " my-graniteamf " ));
                     var operation:Operation  =   new  Operation();
                     operation.name  =   " test " ;
                     operation.addEventListener(FaultEvent.FAULT,handleFault);
                     operation.addEventListener(ResultEvent.RESULT,handleRs);
                     srv.operations  =  {test: operation};
                     srv.test();
                }
                private function handleFault(e:FaultEvent):void{
                    Alert.show(e.toString());
                }
                private function handleRs(e:ResultEvent):void{
                    Alert.show(e.toString());
                }
                <mx:Button id="Test" label="TestIt" click=" testSend ();"/>

Screen shot


 
Conclusion
  
   from this example, you can see it's very easy to add osgi dynamic feathure support in Graniteds.

Enjoy it!!!


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