Example usage for java.nio.file WatchKey pollEvents

Introduction

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

Prototype

List<WatchEvent<?>> pollEvents();

Source Link

Document

Retrieves and removes all pending events for this watch key, returning a List of the events that were retrieved.

Usage

From source file:net.mindengine.dashserver.compiler.GlobalAssetsFileWatcher.java

@Override
public void run() {
    copyAllAssets();/* w ww .ja  v a2 s.  c o m*/

    Path path = Paths.get(this.assetsFolderPath);
    FileSystem fileSystem = path.getFileSystem();
    try (WatchService service = fileSystem.newWatchService()) {
        path.register(service, ENTRY_MODIFY, ENTRY_CREATE);

        while (true) {
            WatchKey watchKey = service.take();

            for (WatchEvent<?> watchEvent : watchKey.pollEvents()) {
                Path watchEventPath = (Path) watchEvent.context();
                String fileName = watchEventPath.toString();
                copyFileAsset(fileName);
            }

            if (!watchKey.reset()) {
                break;
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:cz.muni.fi.pb138.cvmanager.service.PDFgenerator.java

/**
 * By external calling pdflatex function of laTex generates pdf curriculum vitae document from .tex file
 * @param username name of user whose is the CV
 * @return language to export (sk/en)/*  www.j  a  v  a  2 s  .c  om*/
 * @throws IOException
 * @throws InterruptedException
 * @throws NullPointerException
 */
public InputStream latexToPdf(String username) throws IOException, InterruptedException, NullPointerException {
    ProcessBuilder pb = new ProcessBuilder("pdflatex", username + "_cv.tex", "--output-directory=");
    File file = new File("cvxml/");
    pb.directory(file);
    Process p = pb.start();

    WatchService watcher = FileSystems.getDefault().newWatchService();
    Path dir = Paths.get("cvxml/");
    dir.register(watcher, ENTRY_CREATE, ENTRY_MODIFY);

    while (true) {
        // wait for a key to be available for 10 seconds
        WatchKey key = watcher.poll(10000L, TimeUnit.MILLISECONDS);
        if (key == null) {
            break;
        }

        for (WatchEvent<?> event : key.pollEvents()) {
            // get event type
            WatchEvent.Kind<?> kind = event.kind();

            // get file name
            @SuppressWarnings("unchecked")
            WatchEvent<Path> ev = (WatchEvent<Path>) event;
            Path fileName = ev.context();

            System.out.println(kind.name() + ": " + fileName);
        }

        boolean valid = key.reset();
        if (!valid) {
            break;
        }
    }

    System.out.println("end of cycle");

    File pdf = new File("cvxml/" + username + "_cv.pdf");

    return new FileInputStream(pdf);
}

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From source file:com.xiaomi.linden.common.util.FileChangeWatcher.java

@Override
public void run() {
    try {// w w w.  jav a 2 s  . co  m
        watcher = FileSystems.getDefault().newWatchService();
        Path path = new File(absolutePath).toPath().getParent();
        String fileWatched = FilenameUtils.getName(absolutePath);
        path.register(watcher, new WatchEvent.Kind[] { StandardWatchEventKinds.ENTRY_MODIFY },
                SensitivityWatchEventModifier.HIGH);
        LOGGER.info("File watcher start to watch {}", absolutePath);

        while (isAlive()) {
            try {
                Thread.sleep(interval);
                WatchKey key = watcher.poll(1000l, TimeUnit.MILLISECONDS);
                if (key == null) {
                    continue;
                }

                List<WatchEvent<?>> events = key.pollEvents();
                for (WatchEvent<?> event : events) {
                    if (event.kind() == StandardWatchEventKinds.ENTRY_MODIFY) {
                        String file = event.context().toString();
                        if (fileWatched.equals(file)) {
                            doOnChange();
                        }
                    }
                }

                if (!key.reset()) {
                    LOGGER.info("File watcher key not valid.");
                }
            } catch (InterruptedException e) {
                LOGGER.error("File watcher thread exit!");
                break;
            }
        }
    } catch (Throwable e) {
        LOGGER.error("File watcher error {}", Throwables.getStackTraceAsString(e));
    }
}

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From source file:SecurityWatch.java

public void watchVideoCamera(Path path) throws IOException, InterruptedException {

    watchService = FileSystems.getDefault().newWatchService();
    register(path, StandardWatchEventKinds.ENTRY_CREATE);

    OUTERMOST: while (true) {

        final WatchKey key = watchService.poll();

        if (key == null) {
            System.out.println("The video camera is jammed - security watch system is canceled!");
            break;
        } else {/*from  w w  w  .j a  va  2  s .  c  o  m*/

            for (WatchEvent<?> watchEvent : key.pollEvents()) {

                final Kind<?> kind = watchEvent.kind();

                if (kind == StandardWatchEventKinds.OVERFLOW) {
                    continue;
                }

                if (kind == StandardWatchEventKinds.ENTRY_CREATE) {

                    //get the filename for the event
                    final WatchEvent<Path> watchEventPath = (WatchEvent<Path>) watchEvent;
                    final Path filename = watchEventPath.context();
                    final Path child = path.resolve(filename);

                    if (Files.probeContentType(child).equals("image/jpeg")) {

                        //print it out the video capture time
                        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MMM-dd HH:mm:ss");
                        System.out.println("Video capture successfully at: " + dateFormat.format(new Date()));
                    } else {
                        System.out.println("The video camera capture format failed! This could be a virus!");
                        break OUTERMOST;
                    }
                }
            }

            boolean valid = key.reset();
            if (!valid) {
                break;
            }
        }
    }

    watchService.close();
}

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From source file:io.mangoo.build.Watcher.java

@SuppressWarnings("all")
private void handleEvents(WatchKey watchKey, Path path) {
    for (WatchEvent<?> watchEvent : watchKey.pollEvents()) {
        WatchEvent.Kind<?> watchEventKind = watchEvent.kind();
        if (OVERFLOW.equals(watchEventKind)) {
            continue;
        }/*  ww w .  j a  va2 s.  c o m*/

        WatchEvent<Path> ev = (WatchEvent<Path>) watchEvent;
        Path name = ev.context();
        Path child = path.resolve(name);

        if (ENTRY_MODIFY.equals(watchEventKind) && !child.toFile().isDirectory()) {
            handleNewOrModifiedFile(child);
        }

        if (ENTRY_CREATE.equals(watchEventKind)) {
            if (!child.toFile().isDirectory()) {
                handleNewOrModifiedFile(child);
            }
            try {
                if (Files.isDirectory(child, NOFOLLOW_LINKS)) {
                    registerAll(child);
                }
            } catch (IOException e) {
                LOG.error("Something fishy happened. Unable to register new dir for watching", e);
            }
        }
    }
}

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From source file:com.gwac.job.FileTransferServiceImpl.java

public void transFile() {
    System.out.println("123");
    try {//from ww  w. j a  v  a2s .com
        System.out.println("123");
        watcher = FileSystems.getDefault().newWatchService();
        Path dir = Paths.get("E:/TestData/gwacTest");
        dir.register(watcher, ENTRY_CREATE, ENTRY_MODIFY);
        System.out.println("Watch Service registered for dir: " + dir.getFileName());
        isSuccess = true;
    } catch (IOException ex) {
        isSuccess = false;
        ex.printStackTrace();
    }

    if (isBeiJingServer || !isSuccess) {
        return;
    }

    if (running == true) {
        log.debug("start job fileTransferJob...");
        running = false;
    } else {
        log.warn("job fileTransferJob is running, jump this scheduler.");
        return;
    }
    try {
        WatchKey key = watcher.poll();
        if (key != null) {
            for (WatchEvent<?> event : key.pollEvents()) {
                WatchEvent.Kind<?> kind = event.kind();
                WatchEvent<Path> ev = (WatchEvent<Path>) event;
                Path fileName = ev.context();
                System.out.println(kind.name() + ": " + fileName);

                if (kind == ENTRY_MODIFY) {
                    System.out.println("My source file has changed!!!");
                }
            }
        }

        boolean valid = key.reset();
        if (!valid) {
            return;
        }
    } catch (Exception ex) {
    }

    if (running == false) {
        running = true;
        log.debug("job fileTransferJob is done.");
    }
}

---

From source file:SecurityWatch.java

public void watchVideoCamera(Path path) throws IOException, InterruptedException {

    watchService = FileSystems.getDefault().newWatchService();
    register(path, StandardWatchEventKinds.ENTRY_CREATE);

    OUTERMOST: while (true) {

        final WatchKey key = watchService.poll(11, TimeUnit.SECONDS);

        if (key == null) {
            System.out.println("The video camera is jammed - security watch system is canceled!");
            break;
        } else {/* w  ww .  jav  a  2  s  . c o  m*/

            for (WatchEvent<?> watchEvent : key.pollEvents()) {

                final Kind<?> kind = watchEvent.kind();

                if (kind == StandardWatchEventKinds.OVERFLOW) {
                    continue;
                }

                if (kind == StandardWatchEventKinds.ENTRY_CREATE) {

                    //get the filename for the event
                    final WatchEvent<Path> watchEventPath = (WatchEvent<Path>) watchEvent;
                    final Path filename = watchEventPath.context();
                    final Path child = path.resolve(filename);

                    if (Files.probeContentType(child).equals("image/jpeg")) {

                        //print it out the video capture time
                        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MMM-dd HH:mm:ss");
                        System.out.println("Video capture successfully at: " + dateFormat.format(new Date()));
                    } else {
                        System.out.println("The video camera capture format failed! This could be a virus!");
                        break OUTERMOST;
                    }
                }
            }

            boolean valid = key.reset();
            if (!valid) {
                break;
            }
        }
    }

    watchService.close();
}

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From source file:de.elomagic.carafile.client.CaraCloud.java

/**
 * Starts synchronization of the given base path with the registry.
 * <p/>//from   w ww . j  av a 2 s  .co m
 * This method will block till call method {@link CaraCloud#stop() }
 *
 * @throws IOException Thrown when an I/O error occurs
 * @throws InterruptedException Thrown when method stop was called or application will terminate
 * @throws GeneralSecurityException
 */
public void start() throws IOException, InterruptedException, GeneralSecurityException {
    if (client == null) {
        throw new IllegalStateException("Attribute \"client\" must be set.");
    }

    if (basePath == null) {
        throw new IllegalStateException("Attribute \"basePath\" must be set.");
    }

    if (!Files.exists(basePath)) {
        throw new IllegalStateException("Path \"" + basePath + "\" must exists.");
    }

    if (!Files.isDirectory(basePath)) {
        throw new IllegalStateException("Path \"" + basePath + "\" must be a directory/folder.");
    }

    watcher = FileSystems.getDefault().newWatchService();
    registerDefaultWatch(basePath);

    while (!Thread.interrupted()) {
        WatchKey key = watcher.take();
        for (WatchEvent<?> event : key.pollEvents()) {
            if (event.kind() == StandardWatchEventKinds.ENTRY_CREATE) {
                Path path = basePath.resolve(event.context().toString());
                createFile(path);
            } else if (event.kind() == StandardWatchEventKinds.ENTRY_MODIFY) {

            } else if (event.kind() == StandardWatchEventKinds.ENTRY_DELETE) {
                Path path = basePath.resolve(event.context().toString());
                deleteFile(path);
            } else {
                LOG.error("Unsupported kind: " + event.kind() + ", path: " + event.context());
            }
        }

        key.reset();
    }
}

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From source file:org.eclipse.smarthome.core.transform.AbstractFileTransformationService.java

/**
 * Ensures that a modified or deleted cached files does not stay in the cache
 */// w  w w  .j av  a2  s .c om
private void processFolderEvents() {
    WatchKey key = watchService.poll();
    if (key != null) {
        for (WatchEvent<?> e : key.pollEvents()) {
            if (e.kind() == OVERFLOW) {
                continue;
            }

            // Context for directory entry event is the file name of entry
            @SuppressWarnings("unchecked")
            WatchEvent<Path> ev = (WatchEvent<Path>) e;
            Path path = ev.context();

            logger.debug("Refreshing transformation file '{}'", path);

            for (String fileEntry : cachedFiles.keySet()) {
                if (fileEntry.endsWith(path.toString())) {
                    cachedFiles.remove(fileEntry);
                }
            }
        }
        key.reset();
    }
}

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From source file:jsonbrowse.JsonBrowse.java

@Override
public void run() {
    try {// www .j  av a 2s . c o m
        WatchKey key = watcher.take();
        while (key != null) {

            if (watching) {
                for (WatchEvent event : key.pollEvents()) {
                    if (event.context() instanceof Path) {
                        Path path = (Path) (event.context());
                        if (path.getFileName().equals(jsonFilePath.getFileName())) {
                            if (path.toFile().length() > 0)
                                updateModel();
                        }
                    }
                }
            }
            key.reset();
            key = watcher.take();
        }
    } catch (InterruptedException | IOException ex) {
        Logger.getLogger(JsonBrowse.class.getName()).log(Level.SEVERE, null, ex);
    }
    System.out.println("Stopping thread.");
}

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