List of watchChanges() Examples

Examples of watchChanges()

org.apache.twill.discovery.ServiceDiscovered.watchChanges()
Registers a {@link ChangeListener} to watch for changes in the discovery list.The {@link ChangeListener#onChange(ServiceDiscovered)} method will be triggered when start watching,and on every subsequent changes in the discovery list. @param listener A {@link ChangeListener} to watch for changes. @param executor A {@link Executor} for issuing call to the given listener. @return A {@link Cancellable} to cancel the watch.

Examples of org.apache.twill.discovery.ServiceDiscovered.watchChanges()

      getContext().announce(SERVICE_NAME, port);


      final CountDownLatch discoveredLatch = new CountDownLatch(1);


      ServiceDiscovered serviceDiscovered = getContext().discover(SERVICE_NAME);
      serviceDiscovered.watchChanges(new ServiceDiscovered.ChangeListener() {
        @Override
        public void onChange(ServiceDiscovered serviceDiscovered) {
          // Try to find a discoverable that is not this instance
          for (Discoverable discoverable : serviceDiscovered) {
            int discoveredPort = discoverable.getSocketAddress().getPort();

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Examples of org.apache.twill.discovery.ServiceDiscovered.watchChanges()

      getContext().announce(SERVICE_NAME, port);


      final CountDownLatch discoveredLatch = new CountDownLatch(1);


      ServiceDiscovered serviceDiscovered = getContext().discover(SERVICE_NAME);
      serviceDiscovered.watchChanges(new ServiceDiscovered.ChangeListener() {
        @Override
        public void onChange(ServiceDiscovered serviceDiscovered) {
          // Try to find a discoverable that is not this instance
          for (Discoverable discoverable : serviceDiscovered) {
            int discoveredPort = discoverable.getSocketAddress().getPort();

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Examples of org.apache.twill.discovery.ServiceDiscovered.watchChanges()

    if (discoverable != null) {
      return createURL(discoverable, applicationId, serviceName);
    }


    final SynchronousQueue<URL> discoverableQueue = new SynchronousQueue<URL>();
    Cancellable discoveryCancel = serviceDiscovered.watchChanges(new ServiceDiscovered.ChangeListener() {
      @Override
      public void onChange(ServiceDiscovered serviceDiscovered) {
        try {
          URL url = createURL(serviceDiscovered.iterator().next(), applicationId, serviceName);
          discoverableQueue.offer(url);

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Examples of org.apache.twill.discovery.ServiceDiscovered.watchChanges()

    httpService.startAndWait();


    // setting watch for ops executor service that we need to be running to operate correctly
    ServiceDiscovered discover = discoveryServiceClient.discover(Constants.Service.DATASET_EXECUTOR);
    opExecutorDiscovered = SettableFuture.create();
    opExecutorServiceWatch = discover.watchChanges(
      new ServiceDiscovered.ChangeListener() {
        @Override
        public void onChange(ServiceDiscovered serviceDiscovered) {
          if (!Iterables.isEmpty(serviceDiscovered)) {
            LOG.info("Discovered {} service", Constants.Service.DATASET_EXECUTOR);

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Examples of org.apache.twill.discovery.ServiceDiscovered.watchChanges()

    if (discoverable != null) {
      return createURL(discoverable, applicationId, serviceId);
    }


    final SynchronousQueue<URL> discoverableQueue = new SynchronousQueue<URL>();
    Cancellable discoveryCancel = serviceDiscovered.watchChanges(new ServiceDiscovered.ChangeListener() {
      @Override
      public void onChange(ServiceDiscovered serviceDiscovered) {
        try {
          URL url = createURL(serviceDiscovered.iterator().next(), applicationId, serviceId);
          discoverableQueue.offer(url);

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Examples of org.apache.twill.discovery.ServiceDiscovered.watchChanges()


  @Override
  protected void startUp() throws Exception {
    // Wait till DatasetService is discovered then start the scheduler.
    ServiceDiscovered discover = discoveryServiceClient.discover(Constants.Service.DATASET_MANAGER);
    cancellable = discover.watchChanges(
      new ServiceDiscovered.ChangeListener() {
        @Override
        public void onChange(ServiceDiscovered serviceDiscovered) {
          if (!Iterables.isEmpty(serviceDiscovered) && !schedulerStarted.get()) {
            LOG.info("Starting scheduler, Discovered {} dataset service(s)",

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