Handler Atomic

HandlerAtomicCount.java

final AtomicInteger counter = new AtomicInteger(0);
vertx.eventBus().send("address1", "args", event -> {
 //some logic
  counter.incrementAndGet();
  next();
});

vertx.eventBus().send("address2", "args", event -> {
  //some logic
  counter.incrementAndGet();
  netx();
});

public void next() {
  if (counter.get() == 2) {
    System.out.println("success.");
  } else {
    System.out.println("wait.");
  }
}