CompositionFuture

comp.java

import io.vertx.core.AbstractVerticle;
import io.vertx.core.CompositeFuture;
import io.vertx.core.Future;
import io.vertx.core.Launcher;
import io.vertx.core.eventbus.EventBus;

import java.util.ArrayList;
import java.util.List;

public class ServiceConnector extends AbstractVerticle {

  public static void main(String[] args) {
    Launcher.main(new String[]{"run", ServiceConnector.class.getName()});
  }

  @Override
  public void start() {
    EventBus eb = vertx.eventBus();

    List<Future> futureList = new ArrayList<Future>();
    for (int i = 0; i < 5; i++) {
      futureList.add(Future.future());
    }

    CompositeFuture.all(futureList).setHandler(fHdl -> {
      System.out.println("All composition");
      for (int i = 0; i < fHdl.result().list().size(); i++) {
        System.out.println("result: " + fHdl.result().list().get(i).toString());
      }
    });


    for (int i = 4; i >= 0; i--) {
      Future<String> future = futureList.get(i);
      future.complete("result: "+i);
    }
  }
}