Message


1   /*
2    * Copyright (C) The Apache Software Foundation. All rights reserved.
3    *
4    * This software is published under the terms of the Apache Software License
5    * version 1.1, a copy of which has been included with this distribution in
6    * the LICENSE.txt file.
7    */
8   package org.apache.avalon.excalibur.event;
9   
10  /**
11   * A Source implements the side of an event queue where QueueElements are
12   * dequeued operations only.
13   *
14   * @author <a HREF="mailto:bloritsch@apache.org">Berin Loritsch</a>
15   */
16  public interface Message extends QueueElement
17  {
18      /**
19       * Get the attachment associated with this Message.  If there is no
20       * attachment, this method will return null.
21       */
22      Object   getAttachment();
23  
24      /**
25       * Attach an Object to the message.
26       */
27      void attach( Object   attachment );
28  
29      /**
30       * Clear the attachment.
31       */
32      void clear();
33  }

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