import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import net.sourceforge.guacamole.GuacamoleException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
/**
- * Simple HttpServlet which outputs XML containing a list of all authorized
- * configurations for the current user.
+ * Simple ServletContextListener which loads a WebSocket tunnel implementation
+ * if available, using the Servlet 3.0 API to dynamically load and install
+ * the tunnel servlet.
+ *
+ * Note that because Guacamole depends on the Servlet 2.5 API, and 3.0 may
+ * not be available or needed if WebSocket is not desired, the 3.0 API is
+ * detected and invoked dynamically via reflection.
*
* @author Michael Jumper
*/
public class WebSocketSupportLoader implements ServletContextListener {
+ private Logger logger = LoggerFactory.getLogger(WebSocketSupportLoader.class);
+
@Override
public void contextDestroyed(ServletContextEvent sce) {
}
// Attempt to find WebSocket servlet
Class<Servlet> servlet = (Class<Servlet>) GuacamoleClassLoader.getInstance().findClass(
- "net.sourceforge.guacamole.net.basic.BasicGuacamoleTunnelServlet"
- //"net.sourceforge.guacamole.net.basic.BasicGuacamoleWebSocketTunnelServlet"
+ "net.sourceforge.guacamole.net.basic.BasicGuacamoleWebSocketTunnelServlet"
);
// Dynamically add servlet IF SERVLET 3.0 API AVAILABLE!
// If we succesfully load and register the WebSocket tunnel servlet,
// WebSocket is supported.
- System.err.println("WebSocket support found!");
+ logger.info("WebSocket support found and loaded.");
}
+
+ // Servlet API 3.0 unsupported
catch (ClassNotFoundException e) {
- // Servlet API 3.0 unsupported
- System.err.println("Servlet API 3.0 not found.");
+ logger.error("Servlet API 3.0 not found.", e);
}
catch (NoSuchMethodException e) {
- // Servlet API 3.0 unsupported
- System.err.println("Servlet API 3.0 not found.");
+ logger.error("Servlet API 3.0 found, but incomplete.", e);
}
+
+ // Servlet API 3.0 found, but errors during use
catch (IllegalAccessException e) {
+ logger.error("Unable to load WebSocket tunnel servlet.", e);
}
catch (InvocationTargetException e) {
+ logger.error("Internal error loading WebSocket tunnel servlet.", e);
}
}
- catch (ClassNotFoundException e) {
-
- // If no such servlet class, WebSocket support not present
- System.err.println("WebSocket support not found.");
+ // If no such servlet class, WebSocket support not present
+ catch (ClassNotFoundException e) {
+ logger.info("WebSocket support not found.");
}
+
+ // Log all GuacamoleExceptions
catch (GuacamoleException e) {
- e.printStackTrace();
+ logger.error("Unable to load/detect WebSocket support.", e);
}
}