/** Check that a cancelled key will never be queued */
static void testCancel(Path dir) throws IOException {
System.out.println("-- Cancel --");
try (WatchService watcher = FileSystems.getDefault().newWatchService()) {
System.out.format("register %s for events\n", dir);
WatchKey myKey = dir.register(watcher, new WatchEvent.Kind<?>[] {ENTRY_CREATE});
checkKey(myKey, dir);
System.out.println("cancel key");
myKey.cancel();
// create a file in the directory
Path file = dir.resolve("mars");
System.out.format("create: %s\n", file);
Files.createFile(file);
// poll for keys - there will be none
System.out.println("poll...");
try {
WatchKey key = watcher.poll(3000, TimeUnit.MILLISECONDS);
if (key != null) throw new RuntimeException("key should not be queued");
} catch (InterruptedException x) {
throw new RuntimeException(x);
}
// done
Files.delete(file);
System.out.println("OKAY");
}
}
/**
* Test that directory can be registered with more than one watch service and that events don't
* interfere with each other
*/
static void testTwoWatchers(Path dir) throws IOException {
System.out.println("-- Two watchers test --");
FileSystem fs = FileSystems.getDefault();
WatchService watcher1 = fs.newWatchService();
WatchService watcher2 = fs.newWatchService();
try {
Path name1 = fs.getPath("gus1");
Path name2 = fs.getPath("gus2");
// create gus1
Path file1 = dir.resolve(name1);
System.out.format("create %s\n", file1);
Files.createFile(file1);
// register with both watch services (different events)
System.out.println("register for different events");
WatchKey key1 = dir.register(watcher1, new WatchEvent.Kind<?>[] {ENTRY_CREATE});
WatchKey key2 = dir.register(watcher2, new WatchEvent.Kind<?>[] {ENTRY_DELETE});
if (key1 == key2) throw new RuntimeException("keys should be different");
// create gus2
Path file2 = dir.resolve(name2);
System.out.format("create %s\n", file2);
Files.createFile(file2);
// check that key1 got ENTRY_CREATE
takeExpectedKey(watcher1, key1);
checkExpectedEvent(key1.pollEvents(), StandardWatchEventKinds.ENTRY_CREATE, name2);
// check that key2 got zero events
WatchKey key = watcher2.poll();
if (key != null) throw new RuntimeException("key not expected");
// delete gus1
Files.delete(file1);
// check that key2 got ENTRY_DELETE
takeExpectedKey(watcher2, key2);
checkExpectedEvent(key2.pollEvents(), StandardWatchEventKinds.ENTRY_DELETE, name1);
// check that key1 got zero events
key = watcher1.poll();
if (key != null) throw new RuntimeException("key not expected");
// reset for next test
key1.reset();
key2.reset();
// change registration with watcher2 so that they are both
// registered for the same event
System.out.println("register for same event");
key2 = dir.register(watcher2, new WatchEvent.Kind<?>[] {ENTRY_CREATE});
// create file and key2 should be queued
System.out.format("create %s\n", file1);
Files.createFile(file1);
takeExpectedKey(watcher2, key2);
checkExpectedEvent(key2.pollEvents(), StandardWatchEventKinds.ENTRY_CREATE, name1);
System.out.println("OKAY");
} finally {
watcher2.close();
watcher1.close();
}
}
/** Simple test to check exceptions and other cases */
@SuppressWarnings("unchecked")
static void testExceptions(Path dir) throws IOException {
System.out.println("-- Exceptions and other simple tests --");
WatchService watcher = FileSystems.getDefault().newWatchService();
try {
// Poll tests
WatchKey key;
System.out.println("poll...");
key = watcher.poll();
if (key != null) throw new RuntimeException("no keys registered");
System.out.println("poll with timeout...");
try {
long start = System.currentTimeMillis();
key = watcher.poll(3000, TimeUnit.MILLISECONDS);
if (key != null) throw new RuntimeException("no keys registered");
long waited = System.currentTimeMillis() - start;
if (waited < 2900) throw new RuntimeException("poll was too short");
} catch (InterruptedException x) {
throw new RuntimeException(x);
}
// IllegalArgumentException
System.out.println("IllegalArgumentException tests...");
try {
dir.register(watcher, new WatchEvent.Kind<?>[] {});
throw new RuntimeException("IllegalArgumentException not thrown");
} catch (IllegalArgumentException x) {
}
try {
// OVERFLOW is ignored so this is equivalent to the empty set
dir.register(watcher, new WatchEvent.Kind<?>[] {OVERFLOW});
throw new RuntimeException("IllegalArgumentException not thrown");
} catch (IllegalArgumentException x) {
}
// UnsupportedOperationException
try {
dir.register(
watcher,
new WatchEvent.Kind<?>[] {
new WatchEvent.Kind<Object>() {
@Override
public String name() {
return "custom";
}
@Override
public Class<Object> type() {
return Object.class;
}
}
});
} catch (UnsupportedOperationException x) {
}
try {
dir.register(
watcher,
new WatchEvent.Kind<?>[] {ENTRY_CREATE},
new WatchEvent.Modifier() {
@Override
public String name() {
return "custom";
}
});
throw new RuntimeException("UnsupportedOperationException not thrown");
} catch (UnsupportedOperationException x) {
}
// NullPointerException
System.out.println("NullPointerException tests...");
try {
dir.register(null, new WatchEvent.Kind<?>[] {ENTRY_CREATE});
throw new RuntimeException("NullPointerException not thrown");
} catch (NullPointerException x) {
}
try {
dir.register(watcher, new WatchEvent.Kind<?>[] {null});
throw new RuntimeException("NullPointerException not thrown");
} catch (NullPointerException x) {
}
try {
dir.register(watcher, new WatchEvent.Kind<?>[] {ENTRY_CREATE}, (WatchEvent.Modifier) null);
throw new RuntimeException("NullPointerException not thrown");
} catch (NullPointerException x) {
}
} finally {
watcher.close();
}
// -- ClosedWatchServiceException --
System.out.println("ClosedWatchServiceException tests...");
try {
watcher.poll();
throw new RuntimeException("ClosedWatchServiceException not thrown");
} catch (ClosedWatchServiceException x) {
}
// assume that poll throws exception immediately
long start = System.currentTimeMillis();
try {
watcher.poll(10000, TimeUnit.MILLISECONDS);
throw new RuntimeException("ClosedWatchServiceException not thrown");
} catch (InterruptedException x) {
throw new RuntimeException(x);
} catch (ClosedWatchServiceException x) {
long waited = System.currentTimeMillis() - start;
if (waited > 5000) throw new RuntimeException("poll was too long");
}
try {
watcher.take();
throw new RuntimeException("ClosedWatchServiceException not thrown");
} catch (InterruptedException x) {
throw new RuntimeException(x);
} catch (ClosedWatchServiceException x) {
}
try {
dir.register(watcher, new WatchEvent.Kind<?>[] {ENTRY_CREATE});
throw new RuntimeException("ClosedWatchServiceException not thrown");
} catch (ClosedWatchServiceException x) {
}
System.out.println("OKAY");
}