Example usage for java.nio.file WatchKey isValid

Introduction

In this page you can find the example usage for java.nio.file WatchKey isValid.

Prototype

boolean isValid();

Source Link

Document

Tells whether or not this watch key is valid.

Usage

From source file:Test.java

public static void main(String[] args) throws Exception {
    FileSystem fileSystem = FileSystems.getDefault();
    WatchService watchService = fileSystem.newWatchService();
    Path directory = Paths.get("/home/docs");
    WatchEvent.Kind<?>[] events = { StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_DELETE,
            StandardWatchEventKinds.ENTRY_MODIFY };
    directory.register(watchService, events);
    while (true) {
        System.out.println("Waiting for a watch event");
        WatchKey watchKey = watchService.take();
        System.out.println("Path being watched: " + watchKey.watchable());
        if (watchKey.isValid() == false) {
            return;
        }//from  www . j  ava 2 s. co  m
        for (WatchEvent<?> event : watchKey.pollEvents()) {
            System.out.println("Kind: " + event.kind());
            System.out.println("Context: " + event.context());
            System.out.println("Count: " + event.count());
            System.out.println();
        }
        boolean valid = watchKey.reset();
        System.out.println(valid);

    }
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    FileSystem fileSystem = FileSystems.getDefault();
    WatchService watchService = fileSystem.newWatchService();
    Path directory = Paths.get("c:/");
    WatchEvent.Kind<?>[] events = { StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_DELETE,
            StandardWatchEventKinds.ENTRY_MODIFY };
    directory.register(watchService, events);
    while (true) {
        System.out.println("Waiting for a watch event");
        WatchKey watchKey = watchService.take();

        System.out.println("Path being watched: " + watchKey.watchable());
        System.out.println();//from w w  w .  ja v a  2s .c om

        if (watchKey.isValid()) {
            for (WatchEvent<?> event : watchKey.pollEvents()) {
                System.out.println("Kind: " + event.kind());
                System.out.println("Context: " + event.context());
                System.out.println("Count: " + event.count());
                System.out.println();
            }

            boolean valid = watchKey.reset();
            if (!valid) {
                // The watchKey is not longer registered
            }
        }
    }

}

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From source file:Main.java

public static void main(String[] args) throws Exception {

    FileSystem fileSystem = FileSystems.getDefault();
    WatchService watchService = fileSystem.newWatchService();
    Path directory = Paths.get("c:/");
    WatchEvent.Kind<?>[] events = { StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_DELETE,
            StandardWatchEventKinds.ENTRY_MODIFY };
    directory.register(watchService, events);
    while (true) {
        System.out.println("Waiting for a watch event");
        WatchKey watchKey = watchService.take();

        System.out.println("Path being watched: " + watchKey.watchable());
        System.out.println();/*from   w ww .  jav  a  2s.  c  o m*/

        if (watchKey.isValid()) {
            for (WatchEvent<?> event : watchKey.pollEvents()) {
                System.out.println("Kind: " + event.kind());
                System.out.println("Context: " + event.context());
                System.out.println("Count: " + event.count());
                System.out.println();
            }

            boolean valid = watchKey.reset();
            if (!valid) {
                // The watchKey is not longer registered
            }
        }
    }

}

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From source file:com.reactive.hzdfs.dll.JarModuleLoader.java

private Set<File> filesFromEvents() throws InterruptedException {
    WatchKey key = watcher.take();
    Set<File> files = new LinkedHashSet<File>();
    if (key != null && key.isValid()) {
        for (WatchEvent<?> event : key.pollEvents()) {
            if (event.kind() == StandardWatchEventKinds.ENTRY_CREATE
                    || event.kind() == StandardWatchEventKinds.ENTRY_MODIFY) {
                Path item = (Path) event.context();
                File file = new File(
                        ((Path) key.watchable()).toAbsolutePath() + File.separator + item.getFileName());
                if (log.isDebugEnabled()) {
                    log.debug("Watch Event: " + event.kind() + ": " + file);
                }// w  w w .j  a  va 2 s.c  o  m
                if (isJarFile(file)) {
                    files.add(file);
                } else
                    log.warn("[JAR Loader] Ignoring file:- " + file);
            }

        }
        key.reset();

    }
    return files;
}

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From source file:com.reactivetechnologies.platform.rest.dll.JarModuleLoader.java

private Set<File> filesFromEvents() throws InterruptedException {
    WatchKey key = watcher.take();
    Set<File> files = new LinkedHashSet<File>();
    if (key != null && key.isValid()) {
        for (WatchEvent<?> event : key.pollEvents()) {
            if (event.kind() == StandardWatchEventKinds.ENTRY_CREATE
                    || event.kind() == StandardWatchEventKinds.ENTRY_MODIFY) {
                Path item = (Path) event.context();
                File file = new File(
                        ((Path) key.watchable()).toAbsolutePath() + File.separator + item.getFileName());
                if (log.isDebugEnabled()) {
                    log.debug("Watch Event: " + event.kind() + ": " + file);
                }//from   w  w w .j  a  v a 2 s .co m
                if (isJarFile(file)) {
                    files.add(file);
                } else
                    log.warn("[JAR Loader] Ignoring file " + file);
            }

        }
        key.reset();

    }
    return files;
}

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From source file:ch.cyberduck.core.local.FileWatcher.java

public CountDownLatch register(final Local file, final FileWatcherListener listener) throws IOException {
    // Make sure to canonicalize the watched folder
    final Path folder = new File(file.getParent().getAbsolute()).getCanonicalFile().toPath();
    if (log.isDebugEnabled()) {
        log.debug(String.format("Register folder %s watching for file %s", folder, file));
    }//from   w  w w. j  av  a  2 s.c o  m
    final WatchKey key = monitor.register(folder,
            new WatchEvent.Kind[] { ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY });
    if (!key.isValid()) {
        throw new IOException(String.format("Failure registering for events in %s", file));
    }
    final CountDownLatch lock = new CountDownLatch(1);
    pool.execute(new Callable<Boolean>() {
        @Override
        public Boolean call() throws IOException {
            while (true) {
                // wait for key to be signaled
                final WatchKey key;
                try {
                    lock.countDown();
                    if (log.isDebugEnabled()) {
                        log.debug(String.format("Wait for key from watch service %s", monitor));
                    }
                    key = monitor.take();
                } catch (ClosedWatchServiceException e) {
                    // If this watch service is closed
                    return true;
                } catch (InterruptedException e) {
                    return false;
                }
                if (log.isDebugEnabled()) {
                    log.debug(String.format("Retrieved key %s from watch service %s", key, monitor));
                }
                for (WatchEvent<?> event : key.pollEvents()) {
                    final WatchEvent.Kind<?> kind = event.kind();
                    if (log.isInfoEnabled()) {
                        log.info(String.format("Detected file system event %s", kind.name()));
                    }
                    if (kind == OVERFLOW) {
                        log.error(String.format("Overflow event for %s", folder));
                        break;
                    }
                    // The filename is the context of the event. May be absolute or relative path name.
                    if (matches(normalize(LocalFactory.get(folder.toString()), event.context().toString()),
                            LocalFactory.get(folder.toString(), file.getName()))) {
                        callback(LocalFactory.get(folder.toString()), event, listener);
                    } else {
                        log.warn(String.format("Ignored file system event for unknown file %s",
                                event.context()));
                    }
                }
                // Reset the key -- this step is critical to receive further watch events.
                boolean valid = key.reset();
                if (!valid) {
                    // The key is no longer valid and the loop can exit.
                    return true;
                }
            }
        }
    });
    return lock;
}

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From source file:org.wso2.carbon.inbound.localfile.LocalFileOneTimePolling.java

@SuppressWarnings("unchecked")
private Object watchDirectory() throws IOException {
    Path newPath = Paths.get(watchedDir);
    WatchService watchService = FileSystems.getDefault().newWatchService();
    try {//  w  ww .  j a v  a  2 s . co m
        newPath.register(watchService, ENTRY_MODIFY);
        while (true) {
            WatchKey key = watchService.take();
            if (key != null) {
                for (WatchEvent<?> watchEvent : key.pollEvents()) {
                    WatchEvent.Kind<?> kind = watchEvent.kind();
                    WatchEvent<Path> watchEventPath = (WatchEvent<Path>) watchEvent;
                    Path entry = watchEventPath.context();

                    Path filePath = Paths.get(watchedDir, entry.toString());
                    if (kind == ENTRY_MODIFY) {
                        processFile(filePath, contentType);
                    } else if (kind == OVERFLOW) {
                        continue;
                    }
                    if (log.isDebugEnabled()) {
                        log.debug("Processing file is : " + entry);
                    }
                }
                key.reset();
                if (!key.isValid()) {
                    break;
                }
            }
        }
    } catch (IOException e) {
        log.error("Error while watching directory: " + e.getMessage(), e);
    } catch (InterruptedException ie) {
        log.error("Error while get the WatchKey : " + ie.getMessage(), ie);
    } finally {
        watchService.close();
    }
    return null;
}

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