Example usage for java.nio.file WatchEvent context

List of usage examples for java.nio.file WatchEvent context

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Introduction

In this page you can find the example usage for java.nio.file WatchEvent context.

Prototype

T context();

Source Link

Document

Returns the context for the event.

Usage

From source file:eu.edisonproject.rest.FolderWatcherRunnable.java

@Override
public void run() {
    final Path path = FileSystems.getDefault().getPath(dir);
    try (final WatchService watchService = FileSystems.getDefault().newWatchService()) {
        final WatchKey watchKey = path.register(watchService, StandardWatchEventKinds.ENTRY_CREATE);
        while (true) {
            final WatchKey wk = watchService.take();
            for (WatchEvent<?> event : wk.pollEvents()) {

                final Path changed = (Path) event.context();
                executeClassification(new File(dir + File.separator + changed));
            }/*www.j av  a2  s. co m*/
            // reset the key
            boolean valid = wk.reset();
            if (!valid) {
                Logger.getLogger(FolderWatcherRunnable.class.getName()).log(Level.WARNING,
                        "Key has been unregisterede");
            }
        }
    } catch (IOException ex) {
        Logger.getLogger(FolderWatcherRunnable.class.getName()).log(Level.SEVERE, null, ex);
    } catch (InterruptedException ex) {
        Logger.getLogger(FolderWatcherRunnable.class.getName()).log(Level.SEVERE, null, ex);
    } catch (Exception ex) {
        Logger.getLogger(FolderWatcherRunnable.class.getName()).log(Level.SEVERE, null, ex);
    }
}

From source file:org.dishevelled.thumbnail.examples.ThumbnailDrop.java

/**
 * Process file system watcher events./* w  ww .  ja  v a 2  s.  com*/
 */
void processEvents() {
    for (;;) {
        WatchKey key = null;
        try {
            key = watcher.take();
        } catch (InterruptedException e) {
            return;
        }
        for (WatchEvent<?> event : key.pollEvents()) {
            WatchEvent.Kind kind = event.kind();
            if (kind == OVERFLOW) {
                continue;
            }

            WatchEvent<Path> pathEvent = cast(event);
            Path name = pathEvent.context();
            Path path = watchDirectory.resolve(name);
            if (kind == ENTRY_CREATE) {
                created(path);
            } else if (kind == ENTRY_MODIFY) {
                modified(path);
            }
        }
        if (!key.reset()) {
            key.cancel();
            try {
                watcher.close();
            } catch (IOException e) {
                // ignore
            }
            break;
        }
    }
}

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 a  2s  . co  m*/
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();
    }
}

From source file:ddf.camel.component.catalog.content.ContentProducerDataAccessObject.java

public File getFileUsingRefKey(boolean storeRefKey, Message in) throws ContentComponentException {
    File ingestedFile = null;//from w  w  w.j  a  v  a 2 s  . co  m
    try {
        if (!storeRefKey) {
            ingestedFile = ((GenericFile<File>) in.getBody()).getFile();
        } else {
            WatchEvent<Path> pathWatchEvent = (WatchEvent<Path>) ((GenericFileMessage) in).getGenericFile()
                    .getFile();

            if (pathWatchEvent != null && pathWatchEvent.context() != null) {
                ingestedFile = pathWatchEvent.context().toFile();
            }
        }
    } catch (ClassCastException e) {
        throw new ContentComponentException(
                "Unable to cast message body to Camel GenericFile, so unable to process ingested file");
    }
    return ingestedFile;
}

From source file:org.springframework.integration.file.WatchServiceDirectoryScanner.java

private Set<File> filesFromEvents() {
    WatchKey key = watcher.poll();
    Set<File> files = new LinkedHashSet<File>();
    while (key != null) {
        for (WatchEvent<?> event : key.pollEvents()) {
            if (event.kind() == StandardWatchEventKinds.ENTRY_CREATE) {
                Path item = (Path) event.context();
                File file = new File(
                        ((Path) key.watchable()).toAbsolutePath() + File.separator + item.getFileName());
                if (logger.isDebugEnabled()) {
                    logger.debug("Watch Event: " + event.kind() + ": " + file);
                }/*from   w w  w.  j  a v  a2 s  .co m*/
                if (file.isDirectory()) {
                    files.addAll(walkDirectory(file.toPath()));
                } else {
                    files.add(file);
                }
            } else if (event.kind() == StandardWatchEventKinds.OVERFLOW) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Watch Event: " + event.kind() + ": context: " + event.context());
                }
                if (event.context() != null && event.context() instanceof Path) {
                    files.addAll(walkDirectory((Path) event.context()));
                } else {
                    files.addAll(walkDirectory(this.directory));
                }
            } else {
                if (logger.isDebugEnabled()) {
                    logger.debug("Watch Event: " + event.kind() + ": context: " + event.context());
                }
            }
        }
        key.reset();
        key = watcher.poll();
    }
    return files;
}

From source file:uk.gov.gchq.gaffer.miniaccumulocluster.MiniAccumuloClusterController.java

protected void watchShutdown() {
    LOGGER.info("Watching Shutdown File " + clusterPath + "/" + SHUTDOWN_FILENAME);

    try {/* w  w  w .j  a v a  2s.co m*/
        WatchService watcher = FileSystems.getDefault().newWatchService();
        clusterPath.register(watcher, ENTRY_CREATE);

        OUTER: while (true) {
            WatchKey key;
            try {
                key = watcher.take();
            } catch (final InterruptedException e) {
                return;
            }

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

                if (kind == OVERFLOW) {
                    continue;
                }

                final WatchEvent<Path> ev = (WatchEvent<Path>) event;
                final Path filename = ev.context();

                LOGGER.debug("Filename changed " + filename);

                if (filename.toString().equals(SHUTDOWN_FILENAME)) {
                    MiniAccumuloClusterController.this.stop();
                    break OUTER;
                }
            }

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

        LOGGER.info("Finished Watching Shutdown");
    } catch (final IOException e) {
        LOGGER.error("Failed to watch shutdown", e);
    }
}

From source file:io.gravitee.gateway.services.localregistry.LocalApiDefinitionRegistry.java

@Override
protected void doStart() throws Exception {
    if (enabled) {
        super.doStart();

        this.init();

        executor = Executors.newSingleThreadExecutor(r -> new Thread(r, "registry-monitor"));
        executor.execute(() -> {//from   w  ww.ja va  2  s. co m
            Path registry = Paths.get(registryPath);
            LOGGER.info("Start local registry monitor for directory {}", registry);

            try {
                WatchService watcher = registry.getFileSystem().newWatchService();
                registry.register(watcher, StandardWatchEventKinds.ENTRY_CREATE,
                        StandardWatchEventKinds.ENTRY_DELETE, StandardWatchEventKinds.ENTRY_MODIFY);

                while (true) {
                    WatchKey key;
                    try {
                        key = watcher.take();
                    } catch (InterruptedException ex) {
                        return;
                    }

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

                        @SuppressWarnings("unchecked")
                        WatchEvent<Path> ev = (WatchEvent<Path>) event;
                        Path fileName = registry.resolve(ev.context().getFileName());

                        LOGGER.info("An event occurs for file {}: {}", fileName, kind.name());

                        if (kind == StandardWatchEventKinds.ENTRY_MODIFY) {
                            Api loadedDefinition = loadDefinition(fileName.toFile());
                            Api existingDefinition = definitions.get(fileName);
                            if (existingDefinition != null) {
                                if (apiManager.get(existingDefinition.getId()) != null) {
                                    apiManager.update(loadedDefinition);
                                } else {
                                    apiManager.undeploy(existingDefinition.getId());
                                    definitions.remove(fileName);
                                    apiManager.deploy(loadedDefinition);
                                    definitions.put(fileName, loadedDefinition);
                                }
                            }
                        } else if (kind == StandardWatchEventKinds.ENTRY_CREATE) {
                            Api loadedDefinition = loadDefinition(fileName.toFile());
                            Api existingDefinition = apiManager.get(loadedDefinition.getId());
                            if (existingDefinition != null) {
                                apiManager.update(loadedDefinition);
                            } else {
                                apiManager.deploy(loadedDefinition);
                                definitions.put(fileName, loadedDefinition);
                            }
                        } else if (kind == StandardWatchEventKinds.ENTRY_DELETE) {
                            Api existingDefinition = definitions.get(fileName);
                            if (existingDefinition != null
                                    && apiManager.get(existingDefinition.getId()) != null) {
                                apiManager.undeploy(existingDefinition.getId());
                                definitions.remove(fileName);
                            }
                        }

                        boolean valid = key.reset();
                        if (!valid) {
                            break;
                        }
                    }
                }
            } catch (IOException ioe) {
                LOGGER.error("Unexpected error while looking for PI definitions from filesystem", ioe);
            }
        });
    }
}

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);
                }/*from   w w w  .  j av a 2 s  .  c  o m*/
                if (isJarFile(file)) {
                    files.add(file);
                } else
                    log.warn("[JAR Loader] Ignoring file:- " + file);
            }

        }
        key.reset();

    }
    return files;
}

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

/**
 * Starts synchronization of the given base path with the registry.
 * <p/>// w  w w.j  a  v  a  2s  .  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();
    }
}

From source file:org.apache.tomee.jul.handler.rotating.ArchivingTest.java

@SuppressWarnings("unchecked")
@Test//from ww  w  .  j  a  v  a 2  s .  c  om
public void logAndRotateAndPurge() throws Exception {
    clean("target/ArchivingTestPurge-" + format + "/logs");

    final AtomicReference<String> today = new AtomicReference<>();
    final Map<String, String> config = new HashMap<>();

    // initial config
    today.set("2015-09-01");
    config.put("filenamePattern", "target/ArchivingTestPurge-" + format + "/logs/test.%s.%d.log");
    config.put("archiveDirectory", "target/ArchivingTestPurge-" + format + "/logs/archives");
    config.put("archiveFormat", format);
    config.put("archiveOlderThan", "1 s");
    config.put("purgeOlderThan", "2 s");
    config.put("limit", "10 kilobytes");
    config.put("level", "INFO");
    config.put("dateCheckInterval", "1 second");

    final LocalFileHandler handler = new LocalFileHandler() {
        @Override
        protected String currentDate() {
            return today.get();
        }

        @Override
        protected String getProperty(final String name, final String defaultValue) {
            final String s = config.get(name.substring(name.lastIndexOf('.') + 1));
            return s != null ? s : defaultValue;
        }
    };

    final String string10chars = "abcdefghij";
    final int iterations = 950;
    for (int i = 0; i < iterations; i++) {
        handler.publish(new LogRecord(Level.INFO, string10chars));
    }

    today.set("2015-09-02");
    try {
        Thread.sleep(2000);
    } catch (final InterruptedException e) {
        Thread.interrupted();
    }

    final File logArchive = new File(
            "target/ArchivingTestPurge-" + format + "/logs/archives/test.2015-09-01.0.log." + format);
    final File parentFile = logArchive.getParentFile();
    if (!parentFile.exists() && !parentFile.mkdirs()) {
        Assert.fail("Unable to create: " + parentFile);
    }
    final Path dir = parentFile.toPath();
    final WatchService watcher = FileSystems.getDefault().newWatchService();
    final WatchKey key = dir.register(watcher, ENTRY_CREATE, ENTRY_MODIFY);

    latch.set(new CountDownLatch(1));
    watch(key);

    handler.publish(new LogRecord(Level.INFO, string10chars)); // will trigger the archiving

    assertTrue("Failed to get archived log", latch.get().await(20, TimeUnit.SECONDS));
    final WatchEvent<?> watchEvent = lastEvent.get();

    assertTrue(StandardWatchEventKinds.ENTRY_CREATE.equals(watchEvent.kind())
            || StandardWatchEventKinds.ENTRY_MODIFY.equals(watchEvent.kind()));

    final WatchEvent<Path> ev = (WatchEvent<Path>) watchEvent;

    final String io = ev.context().toString();
    assertTrue(io.startsWith("test.2015-09-01.") && io.endsWith(format));

    today.set("2015-09-03");
    try {
        Thread.sleep(2500);
    } catch (final InterruptedException e) {
        Thread.interrupted();
    }

    handler.publish(new LogRecord(Level.INFO, string10chars)); // will trigger the purging
    handler.close();
    withRetry(10, 2, new Runnable() {
        @Override
        public void run() {
            assertFalse(logArchive.getAbsolutePath() + " was purged", logArchive.exists());
        }
    });
}