/*
 * Copyright (c) 2011-2019 Contributors to the Eclipse Foundation
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 * which is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 */

package io.vertx.core.spi.cluster;

/**
 *
 * A NodeListener is called when nodes join or leave the cluster
 *
 * @author <a href="http://tfox.org">Tim Fox</a>
 */
public interface NodeListener {

  /**
   * A node has been added
   * @param nodeID The unique ID of the node
   */
  void nodeAdded(String nodeID);

  /**
   * A node has left
   * @param nodeID  The unique ID of the node
   */
  void nodeLeft(String nodeID);
}
