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package org.glassfish.kernel.event;
import com.sun.logging.LogDomains;
import java.lang.reflect.Method;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.glassfish.api.event.Events;
import org.glassfish.api.event.EventListener;
import org.glassfish.api.event.EventListener.Event;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.hk2.annotations.Inject;
import org.glassfish.deployment.common.DeploymentException;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;
import java.util.concurrent.ExecutorService;
import org.glassfish.api.event.EventTypes;
import org.glassfish.api.event.RestrictTo;
/**
* Simple implementation of the events dispatching facility.
*
* @author Jerome Dochez
*/
@Service
public class EventsImpl implements Events {
@Inject
ExecutorService executor;
final static Logger logger = LogDomains.getLogger(EventsImpl.class, LogDomains.CORE_LOGGER);
List<EventListener> listeners = Collections.synchronizedList(new ArrayList<EventListener>());
public synchronized void register(EventListener listener) {
listeners.add(listener);
}
public void send(final Event event) {
send(event, true);
}
public void send(final Event event, boolean asynchronously) {
List<EventListener> l = new ArrayList<EventListener>();
l.addAll(listeners);
for (final EventListener listener : l) {
Method m =null;
try {
// check if the listener is interested with his event.
m = listener.getClass().getMethod("event", Event.class);
} catch (Throwable ex) {
// We need to catch Throwable, otherwise we can server not to
// shutdown when the following happens:
// Assume a bundle which has registered a event listener
// has been uninstalled without unregistering the listener.
// listener.getClass() refers to a class of such an uninstalled
// bundle. If framework has been refreshed, then the
// classloader can't be used further to load any classes.
// As a result, an exception like NoClassDefFoundError is thrown
// from getMethod.
Logger.getLogger(EventsImpl.class.getName()).log(Level.SEVERE, null, ex);
}
if (m!=null) {
RestrictTo fooBar = m.getParameterTypes()[0].getAnnotation(RestrictTo.class);
if (fooBar!=null) {
EventTypes interested = EventTypes.create(fooBar.value());
if (!event.is(interested)) {
continue;
}
}
}
if (asynchronously) {
executor.submit(new Runnable() {
public void run() {
try {
listener.event(event);
} catch(Throwable e) {
logger.log(Level.WARNING, "Exception while dispatching an event", e);
}
}
});
} else {
try {
listener.event(event);
} catch (DeploymentException de) {
// when synchronous listener throws DeploymentException
// we re-throw the exception to abort the deployment
throw de;
} catch (Throwable e) {
logger.log(Level.WARNING, "Exception while dispatching an event", e);
}
}
}
}
public synchronized boolean unregister(EventListener listener) {
return listeners.remove(listener);
}
}