getVertx().sharedData().getLock("foo", ar -> {
assertTrue(ar.succeeded());
long start = System.currentTimeMillis();
Lock lock = ar.result();
vertx.setTimer(1000, tid -> {
lock.release();
});
getVertx().sharedData().getLock("foo", ar2 -> {
assertTrue(ar2.succeeded());
// Should be delayed
assertTrue(System.currentTimeMillis() - start >= 1000);