Added some warning for some odd state issues that can happen

in real life.
Fixed a subtle bug with the UDP endpoints where they weren't
getting propery closed.  This manifested as the endpoints
still getting broadcasts even after Server no longer knew
about them.


git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7243 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/networking/com/jme3/network/base/KernelAdapter.java

@@ -142,6 +142,10 @@ public class KernelAdapter extends Thread
  
         try {           
             HostedConnection source = getConnection(p);
+            if( source == null ) {
+                log.log( Level.WARNING, "Recieved message from unconnected endpoint:" + p + "  message:" + m );
+                return; 
+            }
             messageDispatcher.messageReceived( source, m );
         } catch( Exception e ) {
             reportError(e);

engine/src/networking/com/jme3/network/kernel/udp/UdpEndpoint.java

@@ -53,6 +53,7 @@ public class UdpEndpoint implements Endpoint
     private SocketAddress address;
     private DatagramSocket socket;
     private UdpKernel kernel;
+    private boolean connected = true; // it's connectionless but we track logical state
 
     public UdpEndpoint( UdpKernel kernel, long id, SocketAddress address, DatagramSocket socket )
     {
@@ -85,6 +86,7 @@ public class UdpEndpoint implements Endpoint
     
         try {
             kernel.closeEndpoint(this);
+            connected = false;
         } catch( IOException e ) {
             throw new KernelException( "Error closing endpoint for socket:" + socket, e );
         }
@@ -102,11 +104,16 @@ public class UdpEndpoint implements Endpoint
 
     public boolean isConnected()
     {
-        return socket.isConnected();
+        // The socket is always unconnected anyway so we track our
+        // own logical state for the kernel's benefit.
+        return connected;
     }
 
     public void send( ByteBuffer data )
     {
+        if( !isConnected() ) {
+            throw new KernelException( "Endpoint is not connected:" + this );
+        }
         try {
             DatagramPacket p = new DatagramPacket( data.array(), data.position(), 
                                                    data.remaining(), address );