/*
 * 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
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.samoa.tasks;

import org.apache.samoa.topology.ComponentFactory;
import org.apache.samoa.topology.Topology;

/**
 * Task interface, the mother of all SAMOA tasks!
 */
public interface Task {

  /**
   * Initialize this SAMOA task, i.e. create and connect ProcessingItems and Streams and initialize the topology
   */
  public void init();

  /**
   * Return the final topology object to be executed in the cluster
   * 
   * @return topology object to be submitted to be executed in the cluster
   */
  public Topology getTopology();

  // /**
  // * Return the entrance processor to start SAMOA topology
  // * The logic to start the topology should be implemented here
  // * @return entrance processor to start the topology
  // */
  // public TopologyStarter getTopologyStarter();

  /**
   * Sets the factory. TODO: propose to hide factory from task, i.e. Task will only see TopologyBuilder, and factory
   * creation will be handled by TopologyBuilder
   * 
   * @param factory
   *          the new factory
   */
  public void setFactory(ComponentFactory factory);

}