01: /*
02: * <copyright>
03: *
04: * Copyright 1997-2004 BBNT Solutions, LLC
05: * under sponsorship of the Defense Advanced Research Projects
06: * Agency (DARPA).
07: *
08: * You can redistribute this software and/or modify it under the
09: * terms of the Cougaar Open Source License as published on the
10: * Cougaar Open Source Website (www.cougaar.org).
11: *
12: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
13: * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
14: * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
15: * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
16: * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
17: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
18: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
22: * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23: *
24: * </copyright>
25: */
26:
27: package org.cougaar.mts.base;
28:
29: import org.cougaar.core.service.LoggingService;
30: import org.cougaar.mts.std.AspectFactory;
31:
32: import java.util.HashSet;
33: import java.util.Iterator;
34: import java.util.List;
35:
36: /**
37: * This abstraction provides 'listener' support to inform interested
38: * parties when objects are removed from message queues.
39: */
40: abstract class QueueFactory extends AspectFactory {
41: private HashSet listeners = new HashSet();
42:
43: public void addListener(QueueListener listener) {
44: synchronized (listeners) {
45: listeners.add(listener);
46: }
47: LoggingService lsvc = getLoggingService();
48: if (lsvc.isInfoEnabled())
49: lsvc.info("Add listener " + listener);
50: }
51:
52: public void removeListener(QueueListener listener) {
53: synchronized (listeners) {
54: listeners.remove(listener);
55: }
56: LoggingService lsvc = getLoggingService();
57: if (lsvc.isInfoEnabled())
58: lsvc.info("Remove listener " + listener);
59: }
60:
61: protected void notifyListeners(List messages) {
62: if (messages.isEmpty())
63: return;
64: LoggingService lsvc = getLoggingService();
65: if (lsvc.isInfoEnabled())
66: lsvc.info("Notify listeners");
67: synchronized (listeners) {
68: Iterator itr = listeners.iterator();
69: QueueListener listener;
70: while (itr.hasNext()) {
71: listener = (QueueListener) itr.next();
72: if (lsvc.isInfoEnabled())
73: lsvc.info("Notify listener " + listener);
74: listener.messagesRemoved(messages);
75: }
76: }
77: }
78:
79: }
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