01: /*
02: * <copyright>
03: *
04: * Copyright 2002-2004 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.core.wp.bootstrap;
28:
29: import org.cougaar.core.component.Service;
30: import org.cougaar.core.component.ServiceAvailableEvent;
31: import org.cougaar.core.component.ServiceAvailableListener;
32: import org.cougaar.core.component.ServiceBroker;
33:
34: /**
35: * A utility class to hide late-binding {@link Service} lookups.
36: * <p>
37: * This could be moved into org.cougaar.core.component.
38: */
39: public class ServiceFinder {
40:
41: private ServiceFinder() {
42: }
43:
44: public interface Callback {
45: void foundService(Service s);
46: }
47:
48: public static boolean findServiceLater(final ServiceBroker sb,
49: final Class cl, final Object requestor, final Callback cb) {
50: final Object req = (requestor == null ? ServiceFinder.class
51: : requestor);
52: if (sb.hasService(cl)) {
53: Service s = (Service) sb.getService(req, cl, null);
54: cb.foundService(s);
55: return true;
56: }
57: ServiceAvailableListener sal = new ServiceAvailableListener() {
58: public void serviceAvailable(ServiceAvailableEvent ae) {
59: if (cl.isAssignableFrom(ae.getService())) {
60: Service s = (Service) sb.getService(req, cl, null);
61: cb.foundService(s);
62: //sb.removeServiceListener(this);
63: }
64: }
65: };
66: sb.addServiceListener(sal);
67: return false;
68: }
69: }
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