http://nexus.sonatype.org/oss-repository-hosting.html/vertx-parent/vertx-ext/vertx-ext-parent/vertx-consul-client: Sonatype helps open source projects to set up Maven repositories on https://oss.sonatype.org/ (Eclipse) 
/*
 * Copyright (c) 2016 The original author or authors
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Apache License v2.0 which accompanies this distribution.
 *
 *      The Eclipse Public License is available at
 *      http://www.eclipse.org/legal/epl-v10.html
 *
 *      The Apache License v2.0 is available at
 *      http://www.opensource.org/licenses/apache2.0.php
 *
 * You may elect to redistribute this code under either of these licenses.
 */
package examples;

import io.vertx.core.Vertx;
import io.vertx.ext.consul.Watch;


Author:Ruslan Sennov
/**
 * @author <a href="mailto:ruslan.sennov@gmail.com">Ruslan Sennov</a>
 */
public class Watches {

  public void watchKey(Vertx vertx) {
    Watch.key("foo/bar", vertx)
      .setHandler(res -> {
        if (res.succeeded()) {
          System.out.println("value: " + res.nextResult().getValue());
        } else {
          res.cause().printStackTrace();
        }
      })
      .start();
  }
}