Make use of internal Vert.x EventLoopGroup

[meshuga]

Mongo client can make use of Netty event loop group for async request processing, so it might be possible to pass a vert.x group instance using io.vertx.core.Vertx#nettyEventLoopGroup() to https://github.com/mongodb/mongo-java-driver/blob/master/driver-async/src/main/com/mongodb/async/client/MongoClientSettings.java#L272 like below:

builder.streamFactoryFactory(
  new NettyStreamFactoryFactory(vertx.nettyEventLoopGroup(), ByteBufAllocator.DEFAULT))
  .build();

According to http://normanmaurer.me/presentations/2014-facebook-eng-netty/slides.html#25.0 it's a good idea 😉

[karianna]

@johnoliver going to have to defer to your wisdom here. Good idea or no?

[llfbandit]

Seems a good idea to me (with all my noobishness knowledge in vertx 🎱 ), the job has been already done in other sections by the way to be more concrete.
This commit is a partial view of some of the places where we can find the attachement to the netty looper : eclipse-vertx/vert.x@a595010