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23
24/* @test %W% %E%
25   @bug 6798062
26   @summary Memory Leak on using getFiles of FileSystemView
27   @author Pavel Porvatov
28   @modules java.desktop/sun.awt
29            java.desktop/sun.awt.shell
30   @run applet/manual=done bug6798062.html
31*/
32
33import sun.awt.OSInfo;
34import sun.awt.shell.ShellFolder;
35
36import javax.swing.*;
37import java.awt.event.ActionEvent;
38import java.awt.event.ActionListener;
39import java.awt.*;
40import java.io.File;
41import java.io.FileNotFoundException;
42
43public class bug6798062 extends JApplet {
44
45    private final JSlider slider = new JSlider(0, 100);
46
47    private final JTextField tfLink = new JTextField();
48
49    private final JButton btnStart = new JButton("Start");
50
51    private final JButton btnStop = new JButton("Stop");
52
53    private final JButton btnGC = new JButton("Run System.gc()");
54
55    private ShellFolder folder;
56
57    private Thread thread;
58
59    public static void main(String[] args) {
60        JFrame frame = new JFrame("bug6798062");
61
62        frame.setSize(400, 300);
63        frame.setLocationRelativeTo(null);
64        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
65        frame.add(new bug6798062().initialize());
66
67        frame.setVisible(true);
68    }
69
70    public void init() {
71        add(initialize());
72    }
73
74    private JComponent initialize() {
75        if (OSInfo.getOSType() != OSInfo.OSType.WINDOWS) {
76            return new JLabel("The test is suitable only for Windows");
77        }
78
79        String tempDir = System.getProperty("java.io.tmpdir");
80
81        if (tempDir.length() == 0) { // 'java.io.tmpdir' isn't guaranteed to be defined
82            tempDir = System.getProperty("user.home");
83        }
84
85        System.out.println("Temp directory: " + tempDir);
86
87        try {
88            folder = ShellFolder.getShellFolder(new File(tempDir));
89        } catch (FileNotFoundException e) {
90            fail("Directory " + tempDir + " not found");
91        }
92
93        slider.setMajorTickSpacing(10);
94        slider.setPaintTicks(true);
95        slider.setPaintLabels(true);
96        slider.setSnapToTicks(true);
97        slider.setValue(10);
98
99        btnStart.addActionListener(new ActionListener() {
100            public void actionPerformed(ActionEvent e) {
101                setEnabledState(false);
102
103                thread = new MyThread(slider.getValue(), tfLink.getText());
104                thread.start();
105            }
106        });
107
108        btnStop.setEnabled(false);
109
110        btnStop.addActionListener(new ActionListener() {
111            public void actionPerformed(ActionEvent e) {
112                thread.interrupt();
113                thread = null;
114
115                setEnabledState(true);
116            }
117        });
118
119        btnGC.addActionListener(new ActionListener() {
120            public void actionPerformed(ActionEvent e) {
121                System.gc();
122            }
123        });
124
125        setEnabledState(true);
126
127        JPanel pnButtons = new JPanel();
128
129        pnButtons.setLayout(new BoxLayout(pnButtons, BoxLayout.X_AXIS));
130
131        pnButtons.add(btnStart);
132        pnButtons.add(btnStop);
133        pnButtons.add(btnGC);
134
135        tfLink.setMaximumSize(new Dimension(300, 20));
136
137        JPanel pnContent = new JPanel();
138
139        pnContent.setLayout(new BoxLayout(pnContent, BoxLayout.Y_AXIS));
140        pnContent.add(new JLabel("Delay between listFiles() invocation (ms):"));
141        pnContent.add(slider);
142        pnContent.add(new JLabel("Provide link here:"));
143        pnContent.add(tfLink);
144        pnContent.add(pnButtons);
145
146        return pnContent;
147    }
148
149    private void setEnabledState(boolean enabled) {
150        slider.setEnabled(enabled);
151        btnStart.setEnabled(enabled);
152        btnStop.setEnabled(!enabled);
153    }
154
155    private static void fail(String msg) {
156        throw new RuntimeException(msg);
157    }
158
159    private class MyThread extends Thread {
160        private final int delay;
161
162        private final ShellFolder link;
163
164        private MyThread(int delay, String link) {
165            this.delay = delay;
166
167            ShellFolder linkFolder;
168
169            try {
170                linkFolder = ShellFolder.getShellFolder(new File(link));
171            } catch (FileNotFoundException e) {
172                e.printStackTrace();
173
174                linkFolder = null;
175            }
176
177            this.link = linkFolder;
178        }
179
180        public void run() {
181            while (!isInterrupted()) {
182                folder.listFiles();
183                if (link != null) {
184                    try {
185                        link.getLinkLocation();
186                    } catch (FileNotFoundException e) {
187                        e.printStackTrace();
188                    }
189                }
190
191                if (delay > 0) {
192                    try {
193                        Thread.sleep(delay);
194                    } catch (InterruptedException e1) {
195                        // The thread was interrupted
196                        return;
197                    }
198                }
199            }
200        }
201    }
202}
203