code: public void signalReady(String stackName, String resourceName) {
          Preconditions.checkArgument(stackName != null && !stackName.isEmpty());
          Preconditions.checkArgument(resourceName != null && !resourceName.isEmpty());
          SignalResourceRequest req = new SignalResourceRequest();
          req.setLogicalResourceId(resourceName);
          req.setStackName(stackName);
          req.setStatus(ResourceSignalStatus.SUCCESS);
          req.setUniqueId(this.ec2Context.getInstanceId());
          this.cloudFormationClient.signalResource(req);
      }
docs: signal success to the given CloudFormation stack.<br>
  <br>
  Needed AWS actions:
  <ul>
  <li>cloudformation:SignalResource</li>
  </ul>