gistfile1.txt

final Context ctx = vertx.currentContext();

otherLibrary.doSomethingAsync("foo", new Runnable() {
   public void run() {
     // This will be executed on the other library's thread so we need to make sure the result is done on the correct context
      ctx.runOnContext(new Handler<Void>() {
        public void handle(Void v) {
          // Now we are on the right context - use the Vert.x API as normal
          request.response().end("blah");
        }
      });  
   }
});