Hello everyone!
I am having troubles with OSGi, using Eclipse's Equinox. My problem is that
I want to create two bundles, one to POST(asynch.) events, and another one
to LISTEN to them. My most frecuent error is that EventAdmin is null and
cannot post any event, but I really do not know what is happening. I post
you my codes for the Event Poster and Event Listener, which I took from
here: http://kenai.com/projects/posteventvssendevent/sources/subversion/show.
The author of it is *Slim Ouertani:*
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* Event Poster * [CODE]package posteventos; import java.util.logging.Level;
import java.util.logging.Logger; import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext; import java.util.Date; import
java.util.Dictionary; import java.util.Properties; import
org.osgi.service.event.Event; import org.osgi.service.event.EventAdmin;
import org.osgi.util.tracker.ServiceTracker; public class Activator
implements BundleActivator { private EventAdmin eventAdmin; private
ServiceTracker eventAdminTracker; private static final String
POST_EVENT_QUEUE = "An Event"; private void postEvent() { Dictionary props =
new Properties(); int i = 0; while (true) { Date d = new Date();
props.put("property", "" + i++ + " : " + d); System.out.println("before post
: " + d); Event event = new Event(POST_EVENT_QUEUE, props);
eventAdmin.postEvent(event); System.out.println("after post : " + d); try {
Thread.sleep(10 * 1000); } catch (InterruptedException ex) {
Logger.getLogger(Activator.class.getName()).log(Level.SEVERE, null, ex); } }
} @Override public void start(BundleContext bundleContext) throws Exception
{ eventAdminTracker = new ServiceTracker(bundleContext,
EventAdmin.class.getName(), null); eventAdminTracker.open(); eventAdmin =
(EventAdmin) eventAdminTracker.getService(); if (eventAdmin != null) { new
Thread() { @Override public void run() { postEvent(); } }.start(); } else {
System.out.println("eventAdmin is null"); //this one to see if it's NULL } }
@Override public void stop(BundleContext bundleContext) throws Exception {
eventAdminTracker.close(); } } [/CODE]
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*Event Listener * [CODE]package listenereventos; import
java.util.Dictionary; import java.util.Hashtable; import
java.util.Properties; import java.util.logging.Level; import
java.util.logging.Logger; import org.osgi.framework.BundleActivator; import
org.osgi.framework.BundleContext; import org.osgi.service.event.Event;
import org.osgi.service.event.EventConstants; import
org.osgi.service.event.EventHandler; /** * Hello world! * */ public class
Activator implements BundleActivator { private static final String
POST_EVENT_QUEUE = "Hola"; @Override public void start(BundleContext
context) throws Exception { Dictionary dp = new Hashtable();
dp.put(EventConstants.EVENT_TOPIC, POST_EVENT_QUEUE); for (int i = 0; i <
50000; i++) { context.registerService(EventHandler.class.getName(), new
[B]PostEventHandler[/B](), dp); //code for this behind } } @Override public
void stop(BundleContext context) throws Exception { } } [/CODE]
____________________________________ *PostEventHandler*: [CODE]package
listenereventos; import java.util.logging.Level; import
java.util.logging.Logger; import org.osgi.service.event.Event; import
org.osgi.service.event.EventHandler; public class PostEventHandler { public
void handleEvent(Event event) { String value =
event.getProperty("property").toString(); try { Thread.sleep(30 * 1000); }
catch (InterruptedException ex) {
Logger.getLogger(Activator.class.getName()).log(Level.SEVERE, null, ex); }
System.out.println("---------------->Post value : " + value); } } [/CODE] I
really don't know what's happening since it's my first time using OSGi
events, and I would really thank any help from you. Regards, Asier[/QUOTE]
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I noticed that the EventTracker size is 0 :
System.out.println(eventAdminTracker.size())
Could it be the problem? Thank you very much,
Asier
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