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.std;
28:
29: import org.cougaar.core.component.ServiceBroker;
30: import org.cougaar.mts.base.DestinationQueue;
31: import org.cougaar.mts.base.DestinationQueueDelegateImplBase;
32: import org.cougaar.mts.base.StandardAspect;
33:
34: /**
35: * This example Aspect shows a simple use of the {@link StepService}.
36: * It pauses each {@link DestinationQueue} after the second message.
37: * Since this Aspect needs the {@link StepService}, it should be
38: * loaded after that service is provided by the {@link StepperAspect}.
39: */
40: public class StepperControlExampleAspect extends StandardAspect {
41: public Object getDelegate(Object delegatee, Class type) {
42: if (type == DestinationQueue.class) {
43: return new DestinationQueueDelegate(
44: (DestinationQueue) delegatee);
45: } else {
46: return null;
47: }
48: }
49:
50: private class DestinationQueueDelegate extends
51: DestinationQueueDelegateImplBase {
52: int count = 0;
53:
54: public DestinationQueueDelegate(DestinationQueue delegatee) {
55: super (delegatee);
56: }
57:
58: public void dispatchNextMessage(AttributedMessage msg) {
59: super .dispatchNextMessage(msg);
60: if (++count == 2) {
61: // Seccond message to this destination has just gone
62: // through. Tell the stepper to pause this queue.
63: ServiceBroker sb = getServiceBroker();
64: StepService svc = (StepService) sb.getService(this ,
65: StepService.class, null);
66: if (svc != null)
67: svc.pause(getDestination());
68: else if (loggingService.isErrorEnabled())
69: loggingService.error("StepperAspect not loaded?");
70: }
71: }
72: }
73: }
|