/*
* Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.tools.jconsole;
import java.awt.Font;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.*;
import javax.swing.*;
/**
* A simple console window to display messages sent to System.out and
* System.err.
*
* A stop-gap solution until an error dialog is implemented.
*/
public class OutputViewer {
private static JFrame frame;
private static JTextArea ta;
static {
System.setOut(PipeListener.create("System.out"));
System.setErr(PipeListener.create("System.err"));
}
// Dummy to cause class to be loaded
public static void init() { }
private static void append(String s) {
if (frame == null) {
// FIXME: The frame title should be a localized string.
frame = new JFrame("JConsole: Output");
ta = new JTextArea();
ta.setEditable(false);
frame.getContentPane().add(new JScrollPane(ta));
ta.setFont(new Font("Monospaced", Font.BOLD, 14));
frame.setSize(500, 600);
frame.setLocation(1024-500, 768-600);
// Exit JConsole if no window remains.
// e.g. jconsole -version only creates the OutputViewer
// but no other window.
frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
if (JFrame.getFrames().length == 1) {
System.exit(0);
}
}
});
}
ta.append(s);
ta.setCaretPosition(ta.getText().length());
frame.setVisible(true);
}
private static void appendln(String s) {
append(s+"\n");
}
private static class PipeListener extends Thread {
public PrintStream ps;
private String name;
private PipedInputStream inPipe;
private BufferedReader br;
public static PrintStream create(String name) {
return new PipeListener(name).ps;
}
private PipeListener(String name) {
this.name = name;
try {
inPipe = new PipedInputStream();
ps = new PrintStream(new PipedOutputStream(inPipe));
br = new BufferedReader(new InputStreamReader(inPipe));
} catch (IOException e) {
appendln("PipeListener<init>("+name+"): " + e);
}
start();
}
public void run() {
try {
String str;
while ((str = br.readLine()) != null) {
appendln(str);
// Hack: Turn off thread check in PipedInputStream.
// Any thread should be allowed to write except this one
// but we just use this one to keep the pipe alive.
try {
java.lang.reflect.Field f =
PipedInputStream.class.getDeclaredField("writeSide");
f.setAccessible(true);
f.set(inPipe, this);
} catch (Exception e) {
appendln("PipeListener("+name+").run: "+e);
}
}
appendln("-- "+name+" closed --");
br.close();
} catch (IOException e) {
appendln("PipeListener("+name+").run: "+e);
}
}
}
}