Source Code Cross Referenced for StepperControlExampleAspect.java in  » Science » Cougaar12_4 » org » cougaar » mts » std » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Science » Cougaar12_4 » org.cougaar.mts.std 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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:        }
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