Task


1   /**
2    * PETALS - PETALS Services Platform.
3    * Copyright (c) 2006 EBM Websourcing, http://www.ebmwebsourcing.com/
4    *
5    * This library is free software; you can redistribute it and/or
6    * modify it under the terms of the GNU Lesser General Public
7    * License as published by the Free Software Foundation; either
8    * version 2.1 of the License, or (at your option) any later version.
9    * This library is distributed in the hope that it will be useful,
10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   * Lesser General Public License for more details.
13   *
14   * You should have received a copy of the GNU Lesser General Public
15   * License along with this library; if not, write to the Free Software
16   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
17   *
18   * -------------------------------------------------------------------------
19   * $Id: Task.java 154 6 oct. 06 ofabre $
20   * -------------------------------------------------------------------------
21   */
22  package org.objectweb.petals.processor;
23  
24  import java.util.HashMap  ;
25  
26  /**
27   * A Task is an execution unit, that can be executed or undo. Tasks can be used
28   * by a processor that will execute them and reverse execution in case of fault.
29   * 
30   * @author ofabre - EBM Websourcing
31   * 
32   */
33  public interface Task {
34  
35      /**
36       * Launch the task with the given context. Task can modify information
37       * included in this context during execution.
38       * 
39       * @param context
40       *            the execution context handling input and output information
41       * @throws Exception
42       *             if an error occurs during Task processing
43       */
44      void execute(HashMap   context) throws Exception  ;
45  
46      /**
47       * Reverse the task in order to retrieve the environ state before execution
48       * of this task.
49       * 
50       * @param context
51       *            the execution context handling input and output information
52       * @throws Exception
53       *             if an error occurs during Task unprocessing
54       */
55      void undo(HashMap   context) throws Exception  ;
56  }
57
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