private JsonObject setDefaults(JsonObject config) {
   config = config.copy();
   // Set the defaults
   if (config.getNumber("session_timeout") == null) {
     config.putNumber("session_timeout", 5l * 1000);
   }
   if (config.getBoolean("insert_JSESSIONID") == null) {
     config.putBoolean("insert_JSESSIONID", true);
   }
   if (config.getNumber("heartbeat_period") == null) {
     config.putNumber("heartbeat_period", 25l * 1000);
   }
   if (config.getNumber("max_bytes_streaming") == null) {
     config.putNumber("max_bytes_streaming", 128 * 1024);
   }
   if (config.getString("prefix") == null) {
     config.putString("prefix", "/");
   }
   if (config.getString("library_url") == null) {
     config.putString("library_url", "http://cdn.sockjs.org/sockjs-0.2.1.min.js");
   }
   if (config.getArray("disabled_transports") == null) {
     config.putArray("disabled_transports", new JsonArray());
   }
   return config;
 }
  @SuppressWarnings("ConstantConditions")
  @Override
  public void handle(Message<JsonObject> message) {
    if (uri == null) {
      sendError(message, "'" + gcm_url + "' is an illegal value for config parameter 'gcm_url'");
      return;
    }

    String apiKey = voidNull(message.body().getString("api_key"));
    if (apiKey.isEmpty()) {
      sendError(message, "Missing mandatory field 'api_key'");
      return;
    }

    JsonObject n = message.body().getObject("notification");
    if (n == null) {
      sendError(message, "Missing mandatory field 'notification'");
      return;
    }

    int ttl = n.getInteger("time_to_live");
    if (ttl > gcm_max_seconds_to_leave) {
      sendError(
          message,
          "Max value of 'time_to_live' exceeded: " + ttl + " > " + gcm_max_seconds_to_leave);
      return;
    }

    JsonArray regIds = n.getArray("registration_ids");
    if (regIds == null || regIds.size() == 0) {
      sendError(message, "Missing mandatory non-empty field 'registration_ids'");
      return;
    }
    if (regIds.size() > gcm_registration_ids_limit) {
      sendError(
          message,
          "Max size of 'registration_ids' exceeded: "
              + regIds.size()
              + " > "
              + gcm_registration_ids_limit);
      return;
    }
    logger.debug("Ready to push notification: " + message.body().encode());
    JsonObject notif = n.copy();

    try {
      send(message, notif, apiKey);
    } catch (Exception e) {
      sendError(message, e.getMessage());
    }
    message.reply("BusMod responded!");
  }
  private void doDeploy(
      final String depName,
      boolean autoRedeploy,
      boolean worker,
      boolean multiThreaded,
      String theMain,
      final ModuleIdentifier modID,
      final JsonObject config,
      final URL[] urls,
      int instances,
      final File modDir,
      final ModuleReference mr,
      final Handler<String> doneHandler) {
    checkWorkerContext();

    final String deploymentName = depName != null ? depName : genDepName();

    log.debug(
        "Deploying name : " + deploymentName + " main: " + theMain + " instances: " + instances);

    // How we determine which language implementation to use:
    // 1. Look for a prefix on the main, e.g. 'groovy:org.foo.myproject.MyGroovyMain' would force
    // the groovy
    //    language impl to be used
    // 2. If there is no prefix, then look at the extension, if any. If there is an extension
    // mapping for that
    //    extension, use that.
    // 3. No prefix and no extension mapping - use the default runtime

    LanguageImplInfo langImplInfo = null;

    final String main;
    // Look for a prefix
    int prefixMarker = theMain.indexOf(COLON);
    if (prefixMarker != -1) {
      String prefix = theMain.substring(0, prefixMarker);
      langImplInfo = languageImpls.get(prefix);
      if (langImplInfo == null) {
        throw new IllegalStateException("No language implementation known for prefix " + prefix);
      }
      main = theMain.substring(prefixMarker + 1);
    } else {
      main = theMain;
    }
    if (langImplInfo == null) {
      // No prefix - now look at the extension
      int extensionMarker = main.lastIndexOf('.');
      if (extensionMarker != -1) {
        String extension = main.substring(extensionMarker + 1);
        String langImplName = extensionMappings.get(extension);
        if (langImplName != null) {
          langImplInfo = languageImpls.get(langImplName);
          if (langImplInfo == null) {
            throw new IllegalStateException(
                "Extension mapping for "
                    + extension
                    + " specified as "
                    + langImplName
                    + ", but no language implementation known for that name");
          }
        }
      }
    }
    if (langImplInfo == null) {
      // Use the default
      langImplInfo = languageImpls.get(defaultLanguageImplName);
      if (langImplInfo == null) {
        throw new IllegalStateException(
            "Default language implementation is "
                + defaultLanguageImplName
                + " but no language implementation known for that name");
      }
    }

    // Include the language impl module as a parent of the classloader
    if (langImplInfo.moduleName != null) {
      if (!loadIncludedModules(modDir, mr, langImplInfo.moduleName)) {
        log.error("Failed to load module: " + langImplInfo.moduleName);
        doneHandler.handle(null);
        return;
      }
    }

    final VerticleFactory verticleFactory;

    final Container container = new DefaultContainer(this);

    try {
      // TODO not one verticle factory per module ref, but one per language per module ref
      verticleFactory = mr.getVerticleFactory(langImplInfo.factoryName, vertx, container);
    } catch (Exception e) {
      log.error("Failed to instantiate verticle factory", e);
      doneHandler.handle(null);
      return;
    }

    final int instCount = instances;

    class AggHandler {
      AtomicInteger count = new AtomicInteger(0);
      boolean failed;

      void done(boolean res) {
        if (!res) {
          failed = true;
        }
        if (count.incrementAndGet() == instCount) {
          String deploymentID = failed ? null : deploymentName;
          callDoneHandler(doneHandler, deploymentID);
        }
      }
    }

    final AggHandler aggHandler = new AggHandler();

    String parentDeploymentName = getDeploymentName();
    final Deployment deployment =
        new Deployment(
            deploymentName,
            main,
            modID,
            instances,
            config == null ? new JsonObject() : config.copy(),
            urls,
            modDir,
            parentDeploymentName,
            mr,
            autoRedeploy);
    mr.incRef();
    deployments.put(deploymentName, deployment);

    if (parentDeploymentName != null) {
      Deployment parentDeployment = deployments.get(parentDeploymentName);
      parentDeployment.childDeployments.add(deploymentName);
    }

    ClassLoader oldTCCL = Thread.currentThread().getContextClassLoader();
    Thread.currentThread().setContextClassLoader(mr.mcl);
    try {

      for (int i = 0; i < instances; i++) {

        // Launch the verticle instance

        Runnable runner =
            new Runnable() {
              public void run() {

                Verticle verticle = null;
                boolean error = true;

                try {
                  verticle = verticleFactory.createVerticle(main);
                  error = false;
                } catch (ClassNotFoundException e) {
                  log.error(
                      "Cannot find verticle "
                          + main
                          + " in "
                          + verticleFactory.getClass().getName(),
                      e);
                } catch (Throwable t) {
                  log.error(
                      "Failed to create verticle "
                          + main
                          + " in "
                          + verticleFactory.getClass().getName(),
                      t);
                }

                if (error) {
                  doUndeploy(
                      deploymentName,
                      new SimpleHandler() {
                        public void handle() {
                          aggHandler.done(false);
                        }
                      });
                  return;
                }
                verticle.setContainer(container);
                verticle.setVertx(vertx);

                try {
                  addVerticle(deployment, verticle, verticleFactory);
                  if (modDir != null) {
                    setPathAdjustment(modDir);
                  }
                  VoidResult vr = new VoidResult();
                  verticle.start(vr);
                  vr.setHandler(
                      new AsyncResultHandler<Void>() {
                        @Override
                        public void handle(AsyncResult<Void> ar) {
                          if (ar.succeeded()) {
                            aggHandler.done(true);
                          } else {
                            log.error(
                                "Failed to deploy verticle "
                                    + main
                                    + " in "
                                    + verticleFactory.getClass().getName(),
                                ar.exception);
                            aggHandler.done(false);
                          }
                        }
                      });
                } catch (Throwable t) {
                  t.printStackTrace();
                  vertx.reportException(t);
                  doUndeploy(
                      deploymentName,
                      new SimpleHandler() {
                        public void handle() {
                          aggHandler.done(false);
                        }
                      });
                }
              }
            };

        if (worker) {
          vertx.startInBackground(runner, multiThreaded);
        } else {
          vertx.startOnEventLoop(runner);
        }
      }
    } finally {
      Thread.currentThread().setContextClassLoader(oldTCCL);
    }
  }