Example usage for java.nio.file FileSystem newWatchService

Introduction

In this page you can find the example usage for java.nio.file FileSystem newWatchService.

Prototype

public abstract WatchService newWatchService() throws IOException;

Source Link

Document

Constructs a new WatchService (optional operation).

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 ww .  j a  va 2  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);

    }
}

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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();/*w w  w .  j av  a  2s  . co  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: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  a2s .  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:net.mindengine.dashserver.compiler.GlobalAssetsFileWatcher.java

@Override
public void run() {
    copyAllAssets();//from   www .  j a  v  a 2 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:acromusashi.stream.ml.common.spout.WatchTextBatchSpout.java

/**
 * ???????????????????/* w  w  w.  j a  v  a  2s . c o  m*/
 * 
 * @param collector Collector
 * @throws IOException 
 * @throws InterruptedException ?
 */
@SuppressWarnings({ "rawtypes" })
protected void checkDataFile(TridentCollector collector) throws IOException, InterruptedException {
    // ?????????????????
    if (this.isInitialReaded == false) {
        List<String> fileContents = FileUtils.readLines(this.targetFile);
        emitTuples(fileContents, collector);
        this.isInitialReaded = true;

        // 
        Path dirPath = new File(this.dataFileDir).toPath();
        FileSystem fileSystem = dirPath.getFileSystem();
        this.watcherService = fileSystem.newWatchService();
        this.watchKey = dirPath.register(this.watcherService,
                new Kind[] { StandardWatchEventKinds.ENTRY_CREATE, StandardWatchEventKinds.ENTRY_MODIFY });

        return;
    }

    // ????????
    WatchKey detectedKey = this.watcherService.poll(1, TimeUnit.SECONDS);

    // ???????????????????????
    if (detectedKey == null || detectedKey.equals(this.watchKey) == false) {
        return;
    }

    try {
        // ???????????????
        for (WatchEvent event : detectedKey.pollEvents()) {

            Path filePath = (Path) event.context();

            // ?????????????
            if (filePath == null
                    || this.targetFile.toPath().getFileName().equals(filePath.getFileName()) == false) {
                continue;
            }

            List<String> fileContents = FileUtils.readLines(this.targetFile);
            emitTuples(fileContents, collector);
        }
    } finally {
        detectedKey.reset();
    }
}

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