Tunnel attach and detach listeners.

guacamole-ext/src/main/java/net/sourceforge/guacamole/net/event/listener/TunnelAttachListener.java

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+package net.sourceforge.guacamole.net.event.listener;
+
+import net.sourceforge.guacamole.net.event.TunnelAttachEvent;
+
+/**
+ * A listener whose tunnelAttached() hook will fire immediately after a new
+ * tunnel is attached to a session.
+ * 
+ * @author Michael Jumper
+ */
+public interface TunnelAttachListener {
+
+   /**
+     * Event hook which fires immediately after a new tunnel is attached to a
+     * session. The return value of this hook dictates whether the tunnel is
+     * allowed to be attached.
+     * 
+     * @param e The TunnelAttachEvent describing the tunnel being attached and
+     *          any associated credentials.
+     * @return true if the tunnel should be allowed to be attached, or false
+     *         if the attempt should be denied, causing the attempt to
+     *         effectively fail.
+     */
+    public boolean tunnelAttached(TunnelAttachEvent e);
+
+}

guacamole-ext/src/main/java/net/sourceforge/guacamole/net/event/listener/TunnelDetachListener.java

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+package net.sourceforge.guacamole.net.event.listener;
+
+import net.sourceforge.guacamole.net.event.TunnelDetachEvent;
+
+/**
+ * A listener whose tunnelDetached() hook will fire immediately after an
+ * existing tunnel is detached from a session.
+ * 
+ * @author Michael Jumper
+ */
+public interface TunnelDetachListener {
+   
+    /**
+     * Event hook which fires immediately after an existing tunnel is detached
+     * from a session. The return value of this hook dictates whether the
+     * tunnel is allowed to be detached.
+     * 
+     * @param e The TunnelDetachEvent describing the tunnel being detached and
+     *          any associated credentials.
+     * @return true if the tunnel should be allowed to be detached, or false
+     *         if the attempt should be denied, causing the attempt to
+     *         effectively fail.
+     */
+    public boolean tunnelDetached(TunnelDetachEvent e);
+
+}