psmith 2003/08/07 00:56:04
Modified: src/java/org/apache/log4j/chainsaw LogUI.java
Log:
Added infrastructure for ShutdownListener and the ability
to register a different Shutdown Action when
a shutdown is requested. By default, Chainsaw
exits the VM, but the developer may choose to override
this.
Revision Changes Path
1.7 +78 -2 jakarta-log4j/src/java/org/apache/log4j/chainsaw/LogUI.java
Index: LogUI.java
===================================================================
RCS file: /home/cvs/jakarta-log4j/src/java/org/apache/log4j/chainsaw/LogUI.java,v
retrieving revision 1.6
retrieving revision 1.7
diff -u -r1.6 -r1.7
--- LogUI.java 22 Jul 2003 03:07:47 -0000 1.6
+++ LogUI.java 7 Aug 2003 07:56:04 -0000 1.7
@@ -148,6 +148,7 @@
import javax.swing.event.ChangeListener;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
+import javax.swing.event.EventListenerList;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.event.TableColumnModelEvent;
@@ -226,6 +227,26 @@
*/
private boolean isGUIFullyInitialized = false;
private Object initializationLock = new Object();
+
+ /**
+ * The shutdownAction is called when the user requests to exit
+ * Chainsaw, and by default this exits the VM, but
+ * a developer may replace this action with something that better suits
+ * their needs
+ */
+ private Action shutdownAction = new AbstractAction() {
+
+ public void actionPerformed(ActionEvent e)
+ {
+ System.exit(0);
+ }
+ };
+
+ /**
+ * Clients can register a ShutdownListener to be notified
+ * when the user has requested Chainsaw to exit.
+ */
+ private EventListenerList shutdownListenerList = new EventListenerList();
/**
* Constructor which builds up all the visual elements of the frame
@@ -258,6 +279,27 @@
}
/**
+ * Registers a ShutdownListener with this calss so that
+ * it can be notified when the user has requested
+ * that Chainsaw exit.
+ *
+ * @param l
+ */
+ public void addShutdownListener(ShutdownListener l) {
+ shutdownListenerList.add(ShutdownListener.class, l);
+ }
+
+ /**
+ * Removes the registered ShutdownListener so
+ * that the listener will not be notified on a shutdown.
+ *
+ * @param l
+ */
+ public void removeShutdownListener(ShutdownListener l) {
+ shutdownListenerList.remove(ShutdownListener.class, l);
+ }
+
+ /**
* Starts Chainsaw by attaching a new instance to the Log4J
* main root Logger via a ChainsawAppender, and activates itself
* @param args
@@ -760,12 +802,46 @@
} catch (Exception e) {
e.printStackTrace();
}
-
- System.exit(0);
+ fireShutdownEvent();
+ performShutdownAction();
}
+
};
new Thread(runnable).start();
+ }
+
+ /**
+ * Ensures all the registered ShutdownListeners are notified.
+ */
+ private void fireShutdownEvent()
+ {
+ ShutdownListener[] listeners = (ShutdownListener[])
shutdownListenerList.getListeners(ShutdownListener.class);
+ for (int i = 0; i < listeners.length; i++) {
+ listeners[i].shuttingDown();
+ }
+ }
+
+ /**
+ * Configures LogUI's with an action to execute when the user
+ * requests to exit the application, the default action
+ * is to exit the VM.
+ * This Action is called AFTER all the ShutdownListeners have been notified
+ *
+ * @param shutdownAction
+ */
+ public final void setShutdownAction(Action shutdownAction){
+ this.shutdownAction = shutdownAction;
+ }
+
+ /**
+ * Using the current thread, calls the registed Shutdown action's
+ * actionPerformed(...) method.
+ *
+ */
+ private void performShutdownAction(){
+ LogLog.debug("Calling the shutdown Action. Goodbye!");
+ shutdownAction.actionPerformed(new ActionEvent(this,
ActionEvent.ACTION_PERFORMED, "Shutting Down"));
}
/**
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