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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 
33 import sun.awt.OSInfo;
34 import sun.awt.shell.ShellFolder;
35 
36 import javax.swing.*;
37 import java.awt.event.ActionEvent;
38 import java.awt.event.ActionListener;
39 import java.awt.*;
40 import java.io.File;
41 import java.io.FileNotFoundException;
42 
43 public 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 
main(String[] args)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 
init()70     public void init() {
71         add(initialize());
72     }
73 
initialize()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 
setEnabledState(boolean enabled)149     private void setEnabledState(boolean enabled) {
150         slider.setEnabled(enabled);
151         btnStart.setEnabled(enabled);
152         btnStop.setEnabled(!enabled);
153     }
154 
fail(String msg)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 
MyThread(int delay, String link)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 
run()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