01: /*
02: * CheckerConsumer.java
03: *
04: * Version: $Revision: 2074 $
05: *
06: * Date: $Date: 2007-07-19 14:40:11 -0500 (Thu, 19 Jul 2007) $
07: *
08: * Copyright (c) 2002-2007, Hewlett-Packard Company and Massachusetts
09: * Institute of Technology. All rights reserved.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions are
13: * met:
14: *
15: * - Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: *
18: * - Redistributions in binary form must reproduce the above copyright
19: * notice, this list of conditions and the following disclaimer in the
20: * documentation and/or other materials provided with the distribution.
21: *
22: * - Neither the name of the Hewlett-Packard Company nor the name of the
23: * Massachusetts Institute of Technology nor the names of their
24: * contributors may be used to endorse or promote products derived from
25: * this software without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
30: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
31: * HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
32: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
33: * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
34: * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
35: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
36: * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
37: * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
38: * DAMAGE.
39: */
40:
41: package org.dspace.checker;
42:
43: import org.apache.log4j.Logger;
44: import org.dspace.core.Context;
45: import org.dspace.event.Consumer;
46: import org.dspace.event.Event;
47:
48: /**
49: * Class for removing Checker data for a Bitstreams based on deletion events.
50: *
51: * @version $Revision: 2074 $
52: */
53: public class CheckerConsumer implements Consumer {
54: /** log4j logger */
55: private static Logger log = Logger.getLogger(CheckerConsumer.class);
56:
57: private BitstreamInfoDAO bitstreamInfoDAO = new BitstreamInfoDAO();
58:
59: /**
60: * Initialize - allocate any resources required to operate.
61: * Called at the start of ANY sequence of event consume() calls.
62: */
63: public void initialize() throws Exception {
64: // no-op
65: }
66:
67: /**
68: * Consume an event
69: *
70: * @param ctx the execution context object
71: *
72: * @param event the content event
73: */
74: public void consume(Context ctx, Event event) throws Exception {
75:
76: if (event.getEventType() == Event.DELETE) {
77: log.debug("Attempting to remove Checker Info");
78: bitstreamInfoDAO.deleteBitstreamInfoWithHistory(event
79: .getSubjectID());
80: log.debug("Completed removing Checker Info");
81: }
82: }
83:
84: /**
85: * Signal that there are no more events queued in this
86: * event stream.
87: */
88: public void end(Context ctx) throws Exception {
89: // no-op
90: }
91:
92: /**
93: * Finish - free any allocated resources.
94: * Called when consumer is being released
95: */
96: public void finish(Context ctx) throws Exception {
97: // no-op
98: }
99: }
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