Example usage for java.nio.file WatchKey watchable

List of usage examples for java.nio.file WatchKey watchable

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Introduction

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

Prototype

Watchable watchable();

Source Link

Document

Returns the object for which this watch key was created.

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  w  w  w  .j av a2 s . c  om
        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);

    }
}

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 .j  ava2 s . com

        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
            }
        }
    }

}

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 .j  a v 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
            }
        }
    }

}

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  ww. j  av a2  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: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);
                }/*w  ww  .  j  a v  a 2s  .  c o  m*/
                if (isJarFile(file)) {
                    files.add(file);
                } else
                    log.warn("[JAR Loader] Ignoring file " + file);
            }

        }
        key.reset();

    }
    return files;
}

From source file:com.lukakama.serviio.watchservice.watcher.WatcherRunnable.java

@Override
public void run() {
    try {//from w  ww  . ja  va 2 s .  c o m
        log.info("Watcher started.");

        initialize();

        while (true) {
            checkInterrupted();

            WatchKey watchKey = watcher.poll(CHECK_TIMEOUT, TimeUnit.MILLISECONDS);

            if (watchKey != null) {
                try {
                    log.debug("Received watchKey: {} - {}", watchKey, watchKey.watchable());

                    Path parentPath = (Path) watchKey.watchable();

                    for (WatchEvent<?> event : watchKey.pollEvents()) {
                        checkInterrupted();

                        log.debug("Received event: {} - {}", event.kind(), event.context());

                        if (event.kind() == StandardWatchEventKinds.OVERFLOW) {
                            log.warn("Performing a full scan due loss of native FileSystem tracking data.");

                            // Canceling the old watcher.
                            IOUtils.closeQuietly(watcher);

                            // Clean any pending unaccessible path.
                            unaccessiblePaths.clear();
                            creatingPaths.clear();
                            modifyingPaths.clear();

                            // Re-initialize the monitoring.
                            initialize();

                        } else {
                            Path eventPath = parentPath.resolve((Path) event.context());

                            if (event.kind() == StandardWatchEventKinds.ENTRY_CREATE) {
                                checkNewPath(eventPath);

                            } else if (event.kind() == StandardWatchEventKinds.ENTRY_MODIFY) {
                                if (!unaccessiblePaths.contains(eventPath)) {
                                    if (isPathFullyAccessible(eventPath)) {
                                        handlePathChanged(eventPath);

                                    } else {
                                        unaccessiblePaths.add(eventPath);
                                        modifyingPaths.add(eventPath);

                                        log.debug(
                                                "File unacessible upon modification. Starting monitoring for '{}'.",
                                                eventPath);
                                    }
                                }
                            } else if (event.kind() == StandardWatchEventKinds.ENTRY_DELETE) {
                                if (unaccessiblePaths.contains(eventPath)) {
                                    unaccessiblePaths.remove(eventPath);

                                    log.debug("Monitored file removed. Canceling monitoring for '{}'.",
                                            eventPath);

                                    if (modifyingPaths.contains(eventPath)) {
                                        modifyingPaths.remove(eventPath);
                                        handlePathRemoved(eventPath);
                                    } else {
                                        creatingPaths.remove(eventPath);
                                    }
                                } else {
                                    handlePathRemoved(eventPath);
                                }
                            }
                        }
                    }

                } finally {
                    watchKey.reset();
                }
            }

            if (!unaccessiblePaths.isEmpty()) {
                checkAccessiblePaths();

            } else if ((updateNotificationTimestamp != -1)
                    && ((System.currentTimeMillis() - updateNotificationTimestamp) > CHECK_TIMEOUT)) {
                // Nothing happened since last update. Resetting the updateTimestamp and requesting a library update on
                // Serviio.
                updateNotificationTimestamp = -1;
                updateServiioReposotories();

            } else if (updateNotificationTimestamp == -1) {
                // No pending path to checks and no pending updates to notify. Check external configuration changes.

                Object newFlagValue = getFieldValue(LibraryManager.getInstance(),
                        "libraryAdditionsCheckerThread");
                if ((configChangeFlag != null) && (newFlagValue != configChangeFlag)) {
                    log.info("Detected configuration change. Restart monitoring.");
                    configChangeFlag = newFlagValue;

                    // Canceling the old watcher.
                    IOUtils.closeQuietly(watcher);

                    // Clean any pending unaccessible path.
                    unaccessiblePaths.clear();
                    creatingPaths.clear();
                    modifyingPaths.clear();

                    // Re-initialize the monitoring.
                    initialize();
                }
            }
        }
    } catch (InterruptedException e) {
        // This thread has been interrupted. Just exit.
        return;

    } finally {
        // Release any bounded resource.
        unaccessiblePaths.clear();
        creatingPaths.clear();
        modifyingPaths.clear();

        IOUtils.closeQuietly(watcher);

        log.info("Watcher stopped.");
    }
}

From source file:io.stallion.fileSystem.FileSystemWatcherRunner.java

private void doRun() {
    while (shouldRun) {
        Log.fine("Running the file system watcher.");
        WatchKey key;
        try {//from w  w w .j ava 2s . c  o  m
            key = watcher.take();
        } catch (InterruptedException x) {
            Log.warn("Interuppted the watcher!!!");
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                Log.info("Exit watcher run method.");
                return;
            }
            continue;
        }
        Log.fine("Watch event key taken. Runner instance is {0}", this.hashCode());

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

            WatchEvent.Kind<?> kind = event.kind();
            Log.fine("Event is " + kind);
            // This key is registered only
            // for ENTRY_CREATE events,
            // but an OVERFLOW event can
            // occur regardless if events
            // are lost or discarded.
            if (kind == OVERFLOW) {
                continue;
            }

            // The filename is the
            // context of the event.
            WatchEvent<Path> ev = (WatchEvent<Path>) event;
            Path filename = ev.context();

            // Ignore emacs autosave files
            if (filename.toString().contains(".#")) {
                continue;
            }
            Log.finer("Changed file is {0}", filename);
            Path directory = (Path) key.watchable();
            Log.finer("Changed directory is {0}", directory);
            Path fullPath = directory.resolve(filename);
            Log.fine("Changed path is {0}", fullPath);
            Boolean handlerFound = false;
            for (IWatchEventHandler handler : watchedByPath.values()) {
                Log.finer("Checking matching handler {0} {1}", handler.getInternalHandlerLabel(),
                        handler.getWatchedFolder());
                // Ignore private files
                if (filename.getFileName().startsWith(".")) {
                    continue;
                }
                if ((handler.getWatchedFolder().equals(directory.toAbsolutePath().toString())
                        || (handler.getWatchTree() && directory.startsWith(handler.getWatchedFolder())))
                        && (StringUtils.isEmpty(handler.getExtension())
                                || fullPath.toString().endsWith(handler.getExtension()))) {
                    String relativePath = filename.getFileName().toString();
                    Log.info("Handling {0} with watcher {1} for folder {2}", filename,
                            handler.getClass().getName(), handler.getWatchedFolder());
                    try {
                        handler.handle(relativePath, fullPath.toString(), kind, event);
                        handlerFound = true;
                    } catch (Exception e) {
                        Log.exception(e, "Exception processing path={0} handler={1}", relativePath,
                                handler.getClass().getName());
                    }
                }
            }
            if (!handlerFound) {
                Log.info("No handler found for {0}", fullPath);
            }
        }
        // Reset the key -- this step is critical if you want to
        // receive further watch events.  If the key is no longer valid,
        // the directory is inaccessible so exit the loop.
        boolean valid = key.reset();
        if (!valid) {
            Log.warn("Key invalid! Exit watch.");
            break;
        }
    }
}

From source file:org.springframework.cloud.config.monitor.FileMonitorConfiguration.java

private Set<File> filesFromEvents() {
    Set<File> files = new LinkedHashSet<File>();
    if (this.watcher == null) {
        return files;
    }/*  ww  w.  j  av a  2s  .c  om*/
    WatchKey key = this.watcher.poll();
    while (key != null) {
        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 (file.isDirectory()) {
                    files.addAll(walkDirectory(file.toPath()));
                } else {
                    if (!file.getPath().contains(".git")
                            && !PatternMatchUtils.simpleMatch(this.excludes, file.getName())) {
                        if (log.isDebugEnabled()) {
                            log.debug("Watch Event: " + event.kind() + ": " + file);
                        }
                        files.add(file);
                    }
                }
            } else if (event.kind() == StandardWatchEventKinds.OVERFLOW) {
                if (log.isDebugEnabled()) {
                    log.debug("Watch Event: " + event.kind() + ": context: " + event.context());
                }
                if (event.context() != null && event.context() instanceof Path) {
                    files.addAll(walkDirectory((Path) event.context()));
                } else {
                    for (Path path : this.directory) {
                        files.addAll(walkDirectory(path));
                    }
                }
            } else {
                if (log.isDebugEnabled()) {
                    log.debug("Watch Event: " + event.kind() + ": context: " + event.context());
                }
            }
        }
        key.reset();
        key = this.watcher.poll();
    }
    return files;
}

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  va 2 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:org.wso2.carbon.uuf.renderablecreator.hbs.internal.io.HbsRenderableUpdater.java

private void run() {
    while (!isWatchServiceStopped) {
        WatchKey watchKey;
        try {//from w ww. j a  va2  s . c  o  m
            watchKey = watcher.take();
        } catch (ClosedWatchServiceException e) {
            log.debug("File watch service is closed.");
            return;
        } catch (InterruptedException e) {
            log.debug("File watch service interrupted.");
            return;
        }

        for (WatchEvent<?> event : watchKey.pollEvents()) {
            if (event.kind() != StandardWatchEventKinds.ENTRY_MODIFY) {
                continue; // We only watch file modify events.
            }

            Path updatedDirectory = (Path) watchKey.watchable();
            @SuppressWarnings("unchecked")
            Path updatedFileName = ((WatchEvent<Path>) event).context();
            Path updatedFileAbsolutePath = updatedDirectory.resolve(updatedFileName);
            try (DirectoryStream<Path> stream = Files.newDirectoryStream(updatedFileAbsolutePath.getParent())) {
                for (Path entry : stream) {
                    if (Files.isDirectory(entry)) {
                        continue;
                    }

                    MutableHbsRenderable mutableRenderable = watchingRenderables.get(entry);
                    if (mutableRenderable != null) {
                        // Updated file is a MutableHbsRenderable
                        try {
                            mutableRenderable.reload(new StringTemplateSource(
                                    mutableRenderable.getComponentPath(), readFileContent(entry)));
                            log.info("Handlebars template '" + entry + "' reloaded successfully.");
                        } catch (IOException e) {
                            log.error("An error occurred while reloading Handlebars template '" + entry + "'.",
                                    e);
                        }
                        continue;
                    }

                    MutableExecutable mutableExecutable = watchingExecutables.get(entry);
                    if (mutableExecutable != null) {
                        // Updated file is a MutableExecutable
                        try {
                            mutableExecutable.reload(readFileContent(entry));
                            log.info("JavaScript file '" + entry + "' reloaded successfully.");
                        } catch (IOException e) {
                            log.error("An error occurred while reloading JavaScript file '" + entry + "'.", e);
                        }
                    }
                }
            } catch (IOException e) {
                log.error("An error occurred while reloading modified files '" + updatedFileAbsolutePath + "'.",
                        e);
            }
        }

        boolean valid = watchKey.reset();
        if (!valid) {
            // Watch key cannot not be reset because watch service is already closed.
            break;
        }
    }
}