Improve GlobalScreen

src/java/org/jnativehook/GlobalScreen.java

@@ -30,6 +30,7 @@
 import java.io.File;
 import java.util.Iterator;
 import java.util.concurrent.ExecutorService;
+import java.util.logging.Level;
 import java.util.logging.Logger;
 
 /**
@@ -50,7 +51,13 @@ public class GlobalScreen {
 	/**
 	 * Logging service for the native library.
 	 */
-	protected static Logger log = Logger.getLogger(GlobalScreen.class.getPackage().getName());
+	protected static Logger logger = Logger.getLogger(GlobalScreen.class.getPackage().getName());
+	static {
+		logger.setLevel(Level.WARNING);
+		logger.setUseParentHandlers(false);
+	}
+
+	protected GlobalScreen() { }
 
 	/**
 	 * The service to control the hook.
@@ -67,7 +74,11 @@ public class GlobalScreen {
 	 */
 	protected static EventListenerList eventListeners = new EventListenerList();
 
-	static {
+	private static boolean loaded = false;
+	private static void loadLibrary() {
+		if(loaded)
+			return;
+		loaded = true;
 		String libName = System.getProperty("jnativehook.lib.name", "JNativeHook");
 
 		try {
@@ -91,7 +102,7 @@ public class GlobalScreen {
 			}
 			catch (Exception e) {
 				// There was a problem instantiating the library loader.
-				log.severe(e.getMessage());
+				logger.severe(e.getMessage());
 
 				throw new UnsatisfiedLinkError(e.getMessage());
 			}
@@ -130,13 +141,10 @@ public class GlobalScreen {
 		}
 	}
 
-
-	protected GlobalScreen() { }
-
 	/**
 	 * Adds the specified native key listener to receive key events from the
-	 * native system. If listener is null, no exception is thrown and no action
-	 * is performed.
+	 * native system.
+	 * If listener is null, no exception is thrown and no action is performed.
 	 *
 	 * @param listener a native key listener object
 	 */
@@ -149,8 +157,8 @@ public static void addNativeKeyListener(NativeKeyListener listener) {
 	/**
 	 * Removes the specified native key listener so that it no longer receives
 	 * key events from the native system. This method performs no function if
-	 * the listener specified by the argument was not previously added.  If
-	 * listener is null, no exception is thrown and no action is performed.
+	 * the listener specified by the argument was not previously added.I
+	 * If listener is null, no exception is thrown and no action is performed.
 	 *
 	 * @param listener a native key listener object
 	 */
@@ -162,8 +170,8 @@ public static void removeNativeKeyListener(NativeKeyListener listener) {
 
 	/**
 	 * Adds the specified native mouse listener to receive mouse events from the
-	 * native system. If listener is null, no exception is thrown and no action
-	 * is performed.
+	 * native system.
+	 * If listener is null, no exception is thrown and no action is performed.
 	 *
 	 * @param listener a native mouse listener object
 	 */
@@ -176,8 +184,8 @@ public static void addNativeMouseListener(NativeMouseListener listener) {
 	/**
 	 * Removes the specified native mouse listener so that it no longer receives
 	 * mouse events from the native system. This method performs no function if
-	 * the listener specified by the argument was not previously added.  If
-	 * listener is null, no exception is thrown and no action is performed.
+	 * the listener specified by the argument was not previously added.
+	 * If listener is null, no exception is thrown and no action is performed.
 	 *
 	 * @param listener a native mouse listener object
 	 */
@@ -189,8 +197,8 @@ public static void removeNativeMouseListener(NativeMouseListener listener) {
 
 	/**
 	 * Adds the specified native mouse motion listener to receive mouse motion
-	 * events from the native system. If listener is null, no exception is
-	 * thrown and no action is performed.
+	 * events from the native system.
+	 * If listener is null, no exception is thrown and no action is performed.
 	 *
 	 * @param listener a native mouse motion listener object
 	 */
@@ -204,8 +212,8 @@ public static void addNativeMouseMotionListener(NativeMouseMotionListener listen
 	 * Removes the specified native mouse motion listener so that it no longer
 	 * receives mouse motion events from the native system. This method performs
 	 * no function if the listener specified by the argument was not previously
-	 * added.  If listener is null, no exception is thrown and no action is
-	 * performed.
+	 * added.
+	 * If listener is null, no exception is thrown and no action is performed.
 	 *
 	 * @param listener a native mouse motion listener object
 	 */
@@ -217,8 +225,7 @@ public static void removeNativeMouseMotionListener(NativeMouseMotionListener lis
 
 	/**
 	 * Adds the specified native mouse wheel listener to receive mouse wheel
-	 * events from the native system. If listener is null, no exception is
-	 * thrown and no action is performed.
+	 * events from the native system.
 	 *
 	 * @param listener a native mouse wheel listener object
 	 * @since 1.1
@@ -233,8 +240,8 @@ public static void addNativeMouseWheelListener(NativeMouseWheelListener listener
 	 * Removes the specified native mouse wheel listener so that it no longer
 	 * receives mouse wheel events from the native system. This method performs
 	 * no function if the listener specified by the argument was not previously
-	 * added.  If listener is null, no exception is thrown and no action is
-	 * performed.
+	 * added.
+	 * If listener is null, no exception is thrown and no action is performed.
 	 *
 	 * @param listener a native mouse wheel listener object
 	 * @since 1.1
@@ -408,7 +415,7 @@ public static void registerNativeHook() throws NativeHookException {
 					Thread.sleep(250);
 				}
 				catch (InterruptedException e) {
-					log.warning(e.getMessage());
+					logger.warning(e.getMessage());
 					break;
 				}
 			}
@@ -420,6 +427,7 @@ public static void registerNativeHook() throws NativeHookException {
 			hookThread = new NativeHookThread();
 
 			synchronized (hookThread) {
+				loadLibrary();
 				hookThread.start();
 
 				try {