[WICKET-7080] 1) make default events delivery machinery pluggable 2) …

…allow to disabled sending events

wicket-core/src/main/java/org/apache/wicket/Component.java

@@ -4445,8 +4445,12 @@ public void onEvent(IEvent<?> event)
 	@Override
 	public final <T> void send(IEventSink sink, Broadcast type, T payload)
 	{
-		new ComponentEventSender(this, getApplication().getFrameworkSettings()).send(sink, type,
-			payload);
+		// if there are no event dispatchers then don't even try to send event
+		if (getApplication().getFrameworkSettings().hasAnyAnyEventDispatchers())
+		{
+			new ComponentEventSender(this, getApplication().getFrameworkSettings()).send(sink, type,
+					payload);
+		}
 	}
 
 	/**

wicket-core/src/main/java/org/apache/wicket/ComponentEvent.java

@@ -101,7 +101,7 @@ public void stop()
 		stop = true;
 	}
 
-	boolean isStop()
+	public boolean isStop()
 	{
 		return stop;
 	}

wicket-core/src/main/java/org/apache/wicket/event/IEvent.java

@@ -30,6 +30,11 @@ public interface IEvent<T>
 	 */
 	void stop();
 
+	/**
+	 * @return true iff event has been stopped.
+	 */
+	boolean isStop();
+
 	/**
 	 * Stops the broadcast of this event any deeper into the hierarchy of the current sink
 	 */

wicket-core/src/main/java/org/apache/wicket/settings/FrameworkSettings.java

@@ -45,8 +45,28 @@
  */
 public class FrameworkSettings implements IEventDispatcher
 {
+	/**
+	 *  Does the standard delivery of events. Override and do nothing if you want to disable it.
+	 */
+	private static class DefaultEventDispatcher implements IEventDispatcher
+	{
+		@Override
+		public void dispatchEvent(Object sink, IEvent<?> event, Component component)
+		{
+			// direct delivery
+			if (component != null && sink instanceof IComponentAwareEventSink)
+			{
+				((IComponentAwareEventSink)sink).onEvent(component, event);
+			}
+			else if (sink instanceof IEventSink)
+			{
+				((IEventSink)sink).onEvent(event);
+			}
+		}
+	}
 	private IDetachListener detachListener;
 
+	private IEventDispatcher defaultEventDispatcher = new DefaultEventDispatcher();
 	private List<IEventDispatcher> eventDispatchers = null;
 
 	/**
@@ -68,7 +88,7 @@ public FrameworkSettings(final Application application)
 	 * Gets the Wicket version. The Wicket version is in the same format as the version element in
 	 * the pom.xml file (project descriptor). The version is generated by maven in the build/release
 	 * cycle and put in the /META-INF/MANIFEST.MF file located in the root folder of the Wicket jar.
-	 *
+	 * <p></p>
 	 * The version usually follows one of the following formats:
 	 * <ul>
 	 * <li>major.minor[.bug] for stable versions. 1.1, 1.2, 1.2.1 are examples</li>
@@ -112,7 +132,7 @@ public FrameworkSettings setDetachListener(IDetachListener detachListener)
 	/**
 	 * Registers a new event dispatcher
 	 *
-	 * @param dispatcher
+	 * @param dispatcher {@link IEventDispatcher}
 	 * @return {@code this} object for chaining
 	 */
 	public FrameworkSettings add(IEventDispatcher dispatcher)
@@ -129,26 +149,30 @@ public FrameworkSettings add(IEventDispatcher dispatcher)
 		return this;
 	}
 
+	/**
+	 * @return Returns <code>true</code> if there is at least one event dispatcher
+	 */
+	public final boolean hasAnyAnyEventDispatchers()
+	{
+		if (defaultEventDispatcher != null)
+		{
+			return true;
+		}
+		return eventDispatchers != null && !eventDispatchers.isEmpty();
+	}
+
 	/**
 	 * Dispatches event to registered dispatchers
 	 * 
 	 * @see IEventDispatcher#dispatchEvent(Object, IEvent, Component)
-	 * 
-	 * @param sink
-	 * @param event
-	 * @param component
+	 *
 	 */
 	@Override
 	public void dispatchEvent(Object sink, IEvent<?> event, Component component)
 	{
-		// direct delivery
-		if (component != null && sink instanceof IComponentAwareEventSink)
+		if (defaultEventDispatcher != null)
 		{
-			((IComponentAwareEventSink)sink).onEvent(component, event);
-		}
-		else if (sink instanceof IEventSink)
-		{
-			((IEventSink)sink).onEvent(event);
+			defaultEventDispatcher.dispatchEvent(sink, event, component);
 		}
 
 		// additional dispatchers delivery
@@ -162,6 +186,19 @@ else if (sink instanceof IEventSink)
 		}
 	}
 
+	/**
+	 * Allows to set the default events dispatcher
+	 *
+	 * @param defaultEventDispatcher
+	 * 			IEventDispatcher
+	 * @return {@code this} object for chaining
+	 */
+	public FrameworkSettings setDefaultEventDispatcher(IEventDispatcher defaultEventDispatcher)
+	{
+		this.defaultEventDispatcher = defaultEventDispatcher;
+		return this;
+	}
+
 	/**
 	 * Sets the {@link ISerializer} that will be used to convert objects to/from byte arrays
 	 *