2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with any library licensed under the Apache Software License,
22 * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
23 * (or with modified versions of the above that use the same license as the above),
24 * and distribute linked combinations including the two. You must obey the
25 * GNU General Public License in all respects for all of the code used other than
26 * the above mentioned libraries. If you modify this file, you may extend this
27 * exception to your version of the file, but you are not obligated to do so.
28 * If you do not wish to do so, delete this exception statement from your version.
33 * <p>A Producer is a set of tasks, scripted in xml. Producers allow
34 * mir installations to have their own actions that can be called for
35 * instance when a new article is posted. Originally producers were
36 * mostly used to generate pages, but they are used for a lot of
37 * other tasks such as pulling rss feeds for the global wire on
40 * <p>Producers can be easily added and configured through the
41 * producers.xml file.</p>
43 * <p>In the admin web interface, producers appear, for example, on
44 * the admin->"Generate manually"->"advanced page": (as Tasks)</p>
46 * <p>Architecture: a "poducer" tag in the producers.xml file defines
47 * a small program. This program (or script) may contain constructs
48 * such as if, loop, and variables... The program is parsed into a
49 * tree of ProducerNodes. The root of this tree is defined in a
50 * NodedProducer (which is the only class that currently implements
51 * the Producer interface). When the Producer is executed, the
52 * "produce" methods of each node are recursively called, effectively
53 * executing the program as it was scripted</p>
55 public interface Producer {
57 * Execute the producer
59 public boolean execute(ProductionContext aContext) throws ProducerFailure, ProducerExc;
62 * Abort the execution of the producer. Will be called from a different
63 * thread and implementations should take this into account.
65 public void abort(ProductionContext aContext);