anchor.diff:  vertx.eventBus().send("com.rhymewithgravy.com.doesit", // <1>
       "apples", // <2>
       reply -> {
  -        System.out.println("Does apples rhyme with gravy? " + reply.result().body()); // <3>
  +        System.out.println("Does apples rhyme with gravy? " + 
  +        	reply.result().body()); // <3>
       }
   );
   ----
  
positive.code:     },
      res -> {
          if (result.succeeded()) {
              System.out.println(String.format("Does %s rhyme with gravy? %b"), word, res.result()); // <3>
          }
      }
  } );
  
negative.code: public class BlockingVerticle extends AbstractVerticle {
      @Override
      public void start() throws Exception {
          vertx.eventBus().<String>consumer("com.rhymewithgravy.doesit", 
              message -> { // <0>
                  boolean answer = SlowBlockingRhyme
                  	  .doesItRhymeWithGravy(message.body()); // <1>
                  message.reply(answer);
              } );
      }
  
      public static void main(String... args) {
          DeploymentOptions opts = new DeploymentOptions().
              setWorker(true); //<2>
          Vertx.vertx()
          	.deployVerticle("com.example.foo.BlockingVerticle", opts); //<3>
      }
  }
  ----
  