public void testSimpleSerial() {
final RxEventBus rxEventBus = new RxEventBus(vertx.eventBus());
final AtomicInteger totalReqs = new AtomicInteger(3);
final AtomicInteger activeReqs = new AtomicInteger(0);
rxEventBus.<String>registerHandler("foo").subscribe(new Action1<RxMessage<String>>() {
@Override
public void call(RxMessage<String> message) {
System.out.println("serial-foo["+message.body()+"]");
message.reply("pong!");
activeReqs.incrementAndGet();