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1 /* |
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2 * Copyright 2010 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 */ |
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23 |
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24 /* @test |
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25 * @bug 6907760 |
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26 * @summary Check that the OVERFLOW event is not retrieved with other events |
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27 * @library .. |
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28 */ |
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29 |
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30 import java.nio.file.*; |
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31 import static java.nio.file.StandardWatchEventKind.*; |
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32 import java.io.IOException; |
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33 import java.util.List; |
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34 import java.util.concurrent.TimeUnit; |
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35 |
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36 public class OverflowEventIsLoner { |
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37 |
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38 static void drainEvents(WatchService watcher, |
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39 WatchEvent.Kind<?> expectedKind, |
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40 int count) |
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41 throws IOException, InterruptedException |
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42 { |
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43 // wait for key to be signalled - the timeout is long to allow for |
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44 // polling implementations |
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45 WatchKey key = watcher.poll(15, TimeUnit.SECONDS); |
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46 if (key != null && count == 0) |
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47 throw new RuntimeException("Key was signalled (unexpected)"); |
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48 if (key == null && count > 0) |
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49 throw new RuntimeException("Key not signalled (unexpected)"); |
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50 |
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51 int nread = 0; |
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52 boolean gotOverflow = false; |
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53 do { |
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54 List<WatchEvent<?>> events = key.pollEvents(); |
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55 for (WatchEvent<?> event: events) { |
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56 WatchEvent.Kind<?> kind = event.kind(); |
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57 if (kind == expectedKind) { |
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58 // expected event kind |
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59 if (++nread > count) |
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60 throw new RuntimeException("More events than expected!!"); |
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61 } else if (kind == OVERFLOW) { |
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62 // overflow event should not be retrieved with other events |
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63 if (events.size() > 1) |
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64 throw new RuntimeException("Overflow retrieved with other events"); |
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65 gotOverflow = true; |
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66 } else { |
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67 throw new RuntimeException("Unexpected event '" + kind + "'"); |
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68 } |
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69 } |
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70 if (!key.reset()) |
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71 throw new RuntimeException("Key is no longer valid"); |
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72 key = watcher.poll(2, TimeUnit.SECONDS); |
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73 } while (key != null); |
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74 |
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75 // check that all expected events were received or there was an overflow |
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76 if (nread < count && !gotOverflow) |
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77 throw new RuntimeException("Insufficient events"); |
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78 } |
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79 |
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80 |
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81 static void test(Path dir) throws IOException, InterruptedException { |
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82 WatchService watcher = dir.getFileSystem().newWatchService(); |
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83 try { |
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84 WatchKey key = dir.register(watcher, ENTRY_CREATE, ENTRY_DELETE); |
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85 |
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86 // create a lot of files |
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87 int n = 1024; |
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88 Path[] files = new Path[n]; |
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89 for (int i=0; i<n; i++) { |
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90 files[i] = dir.resolve("foo" + i).createFile(); |
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91 } |
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92 |
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93 // give time for events to accumulate (improve chance of overflow) |
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94 Thread.sleep(1000); |
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95 |
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96 // check that we see the create events (or overflow) |
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97 drainEvents(watcher, ENTRY_CREATE, n); |
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98 |
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99 // delete the files |
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100 for (int i=0; i<n; i++) { |
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101 files[i].delete(); |
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102 } |
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103 |
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104 // give time for events to accumulate (improve chance of overflow) |
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105 Thread.sleep(1000); |
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106 |
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107 // check that we see the delete events (or overflow) |
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108 drainEvents(watcher, ENTRY_DELETE, n); |
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109 } finally { |
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110 watcher.close(); |
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111 } |
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112 } |
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113 |
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114 public static void main(String[] args) throws Exception { |
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115 Path dir = TestUtil.createTemporaryDirectory(); |
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116 try { |
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117 test(dir); |
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118 } finally { |
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119 TestUtil.removeAll(dir); |
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120 } |
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121 } |
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122 } |