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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
package org.apache.whirr.service;
A callback interface for cluster actions that apply to instances in a given role.

Implementation note. ClusterActionHandler implementations are discovered using a Service Provider Interface (SPI), described in java.util.ServiceLoader.

public abstract class ClusterActionHandler {
  public static final String BOOTSTRAP_ACTION = "bootstrap";
  public static final String CONFIGURE_ACTION = "configure";
  public static final String DESTROY_ACTION = "destroy";
  public abstract String getRole();
Called before the action is performed, giving the implementation an opportunity to specify scripts that should be run as a part of this action.

  public void beforeAction(ClusterActionEvent event)
      throws IOExceptionInterruptedException {
Called after the action has been performed.

  public void afterAction(ClusterActionEvent event)
      throws IOExceptionInterruptedException {
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