Package org.apache.twill.discovery

Examples of org.apache.twill.discovery.Discoverable

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                           "null" : new String(response.getResponseBody(), Charsets.UTF_8));

  }

  private String resolve(String resource) throws DatasetManagementException {
    Discoverable discoverable = endpointStrategySupplier.get().pick();
    if (discoverable == null) {
      throw new DatasetManagementException("Cannot discover dataset service");
    }
    InetSocketAddress addr = discoverable.getSocketAddress();
    return String.format("http://%s:%s%s/data/%s", addr.getHostName(), addr.getPort(),
                         Constants.Gateway.GATEWAY_VERSION, resource);
  }
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  protected void run() throws Exception {
    waitForOpExecutorToStart();

    LOG.info("Announcing DatasetService for discovery...");
    // Register the service
    cancelDiscovery = discoveryService.register(new Discoverable() {
      @Override
      public String getName() {
        return Constants.Service.DATASET_MANAGER;
      }
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                                                                       Constants.Logging.COMPONENT_NAME,
                                                                       Constants.Service.DATASET_EXECUTOR));
    LOG.info("Starting DatasetOpExecutorService...");

    httpService.startAndWait();
    cancellable = discoveryService.register(new Discoverable() {
      @Override
      public String getName() {
        return Constants.Service.DATASET_EXECUTOR;
      }
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  private URL resolve(String instanceName, String opName) throws MalformedURLException {
    return resolve(String.format("datasets/%s/admin/%s", instanceName, opName));
  }

  private URL resolve(String path) throws MalformedURLException {
    Discoverable endpoint = endpointStrategySupplier.get().pick();
    if (endpoint == null) {
      throw new IllegalStateException("No endpoint for " + Constants.Service.DATASET_EXECUTOR);
    }
    InetSocketAddress addr = endpoint.getSocketAddress();
    return new URL(String.format("http://%s:%s%s/data/%s",
                         addr.getHostName(), addr.getPort(),
                         Constants.Gateway.GATEWAY_VERSION,
                         path));
  }
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  public boolean isServiceAvailable() {
    try {
      Iterable<Discoverable> discoverables = this.discoveryServiceClient.discover(serviceName);
      EndpointStrategy endpointStrategy = new TimeLimitEndpointStrategy(
        new RandomEndpointStrategy(discoverables), discoveryTimeout, TimeUnit.SECONDS);
      Discoverable discoverable = endpointStrategy.pick();
      if (discoverable == null) {
        return false;
      }

      return txClient.status().equals(Constants.Monitor.STATUS_OK);
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  public void getWorkflowStatus(String accountId, String appId, String workflowId, final Callback callback)
                      throws IOException, ExecutionException, InterruptedException {
    // determine the service provider for the given path
    String serviceName = String.format("workflow.%s.%s.%s", accountId, appId, workflowId);
    Discoverable discoverable = new RandomEndpointStrategy(discoveryServiceClient.discover(serviceName)).pick();

    if (discoverable == null) {
      LOG.debug("No endpoint for service {}", serviceName);
      callback.handle(new Status(Status.Code.NOT_FOUND, ""));
      return;
    }

    // make HTTP call to workflow service.
    InetSocketAddress endpoint = discoverable.getSocketAddress();
    // Construct request
    String url = String.format("http://%s:%d/status", endpoint.getHostName(), endpoint.getPort());
    Request workflowRequest = new RequestBuilder("GET").setUrl(url).build();

    httpClient.executeRequest(workflowRequest, new AsyncCompletionHandler<Void>() {
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      ApplicationSpecification spec = this.store.getApplication
        (new Id.Application(new Id.Account(accountId), applicationId));
      applications.add(spec);
    }
    Iterable<Discoverable> discoverables = this.discoveryServiceClient.discover(Constants.Service.METRICS);
    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.");
      throw new IOException("Can't find Metrics endpoint");
    }

    for (MetricsScope scope : MetricsScope.values()) {
      for (ApplicationSpecification application : applications) {
        String url = String.format("http://%s:%d%s/metrics/%s/apps/%s",
                                   discoverable.getSocketAddress().getHostName(),
                                   discoverable.getSocketAddress().getPort(),
                                   Constants.Gateway.GATEWAY_VERSION,
                                   scope.name().toLowerCase(),
                                   application.getName());
        sendMetricsDelete(url);
      }
    }

    if (applicationId == null) {
      String url = String.format("http://%s:%d%s/metrics", discoverable.getSocketAddress().getHostName(),
                                 discoverable.getSocketAddress().getPort(), Constants.Gateway.GATEWAY_VERSION);
      sendMetricsDelete(url);
    }
  }
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  }

  // deletes the process metrics for a flow
  private void deleteProcessMetricsForFlow(String application, String flow) throws IOException {
    Iterable<Discoverable> discoverables = this.discoveryServiceClient.discover(Constants.Service.METRICS);
    Discoverable discoverable = new TimeLimitEndpointStrategy(new RandomEndpointStrategy(discoverables),
                                                              3L, TimeUnit.SECONDS).pick();

    if (discoverable == null) {
      LOG.error("Fail to get any metrics endpoint for deleting metrics.");
      throw new IOException("Can't find Metrics endpoint");
    }

    LOG.debug("Deleting metrics for flow {}.{}", application, flow);
    String url = String.format("http://%s:%d%s/metrics/system/apps/%s/flows/%s?prefixEntity=process",
                               discoverable.getSocketAddress().getHostName(),
                               discoverable.getSocketAddress().getPort(),
                               Constants.Gateway.GATEWAY_VERSION,
                               application, flow);

    long timeout = TimeUnit.MILLISECONDS.convert(1, TimeUnit.MINUTES);
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    ServiceDiscovered serviceDiscovered = discoveryServiceClient.discover(String.format("service.%s.%s.%s",
                                                                                        getAccountId(),
                                                                                        applicationId,
                                                                                        serviceId));
    EndpointStrategy endpointStrategy = new RandomEndpointStrategy(serviceDiscovered);
    Discoverable discoverable = endpointStrategy.pick();
    if (discoverable != null) {
      return createURL(discoverable, applicationId, serviceId);
    }

    final SynchronousQueue<URL> discoverableQueue = new SynchronousQueue<URL>();
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      cancelDiscovery.cancel();
    }
  }

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