Examples of org.apache.twill.discovery.Discoverable

org.apache.twill.discovery.Discoverable
Discoverable defines the attributes of service to be discovered.


      DiscoveryService dService = new DiscoveryService() {
        @Override
        public Cancellable register(final Discoverable discoverable) {
          discoverables.add(discoverable);
          return dsService.register(new Discoverable() {
            @Override
            public String getName() {
              return String.format("service.%s.%s.%s", program.getAccountId(),
                                   program.getApplicationId(), program.getName());
            }

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   * generic method to discover a thrift service and start up the
   * thrift transport and protocol layer.
   */
  public static TProtocol getThriftProtocol(String serviceName, EndpointStrategy endpointStrategy) throws
    ServerException {
    Discoverable endpoint = endpointStrategy.pick();
    if (endpoint == null) {
      String message = String.format("Service '%s' is not registered in discovery service.", serviceName);
      LOG.error(message);
      throw new ServerException(message);
    }
    TTransport transport = new TFramedTransport(
      new TSocket(endpoint.getSocketAddress().getHostName(), endpoint.getSocketAddress().getPort()));
    try {
      transport.open();
    } catch (TTransportException e) {
      String message = String.format("Unable to connect to thrift service %s at %s. Reason: %s",
                                     serviceName, endpoint.getSocketAddress(), e.getMessage());
      LOG.error(message);
      throw new ServerException(message, e);
    }
    // now try to connect the thrift client
    return new TBinaryProtocol(transport);

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    emit(appSpec);
  }


  private void deleteMetrics(String account, String application, Iterable<String> flows) throws IOException {
    Iterable<Discoverable> discoverables = this.discoveryServiceClient.discover(Constants.Service.GATEWAY);
    Discoverable discoverable = new TimeLimitEndpointStrategy(new RandomEndpointStrategy(discoverables),
                                                              DISCOVERY_TIMEOUT_SECONDS, TimeUnit.SECONDS).pick();


    if (discoverable == null) {
      LOG.error("Fail to get any metrics endpoint for deleting metrics.");
      return;
    }


    LOG.debug("Deleting metrics for application {}", application);
    for (MetricsScope scope : MetricsScope.values()) {
      for (String flow : flows) {
        String url = String.format("http://%s:%d%s/metrics/%s/apps/%s/flows/%s",
                                   discoverable.getSocketAddress().getHostName(),
                                   discoverable.getSocketAddress().getPort(),
                                   Constants.Gateway.GATEWAY_VERSION,
                                   scope.name().toLowerCase(),
                                   application, flow);


        SimpleAsyncHttpClient client = new SimpleAsyncHttpClient.Builder()

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      for (String hname : getServingHostNames(program.getJarLocation().getInputStream())) {
        final String sname = ProgramType.WEBAPP.name().toLowerCase() + "/" + hname;


        LOG.info("Webapp {} running on address {} registering as {}", program.getApplicationId(), address, sname);
        cancellables.add(discoveryService.register(new Discoverable() {
          @Override
          public String getName() {
            return sname;
          }

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      this.hostname = hostname;
    }


    @Override
    public Cancellable announce(final String serviceName, final int port) {
      return discoveryService.register(new Discoverable() {
        @Override
        public String getName() {
          return serviceName;
        }

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                                  TxConstants.Service.DEFAULT_DATA_TX_BIND_ADDRESS);
      port = configuration.getInt(TxConstants.Service.CFG_DATA_TX_BIND_PORT,
                                  TxConstants.Service.DEFAULT_DATA_TX_BIND_PORT);
      LOG.info("Service assumed at " + address + ":" + port);
    } else {
      Discoverable endpoint = endpointStrategy.pick();
      if (endpoint == null) {
        LOG.error("Unable to discover tx service.");
        throw new TException("Unable to discover tx service.");
      }
      address = endpoint.getSocketAddress().getHostName();
      port = endpoint.getSocketAddress().getPort();
      LOG.info("Service discovered at " + address + ":" + port);
    }


    // now we have an address and port, try to connect a client
    if (timeout < 0) {

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      this.timeoutUnit = timeoutUnit;
    }


    @Override
    public Discoverable pick() {
      Discoverable pick = delegate.pick();
      try {
        long count = 0;
        while (pick == null && count++ < timeout) {
          timeoutUnit.sleep(1);
          pick = delegate.pick();

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    }


    @Override
    public Discoverable pick() {
      // Reservoir sampling
      Discoverable result = null;
      Iterator<Discoverable> itor = endpoints.iterator();
      Random random = new Random();
      int count = 0;
      while (itor.hasNext()) {
        Discoverable next = itor.next();
        if (random.nextInt(++count) == 0) {
          result = next;
        }
      }
      return result;

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      cancelDiscovery.cancel();
    }
  }


  protected void doRegister() {
    cancelDiscovery = discoveryService.register(new Discoverable() {
      @Override
      public String getName() {
        return serviceName;
      }

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    LoggingContextAccessor.setLoggingContext(new ServiceLoggingContext(Constants.Logging.SYSTEM_NAME,
                                                                       Constants.Logging.COMPONENT_NAME,
                                                                       Constants.Service.STREAMS));
    httpService.startAndWait();


    cancellable = discoveryService.register(new Discoverable() {
      @Override
      public String getName() {
        return Constants.Service.STREAMS;
      }

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