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.component.Container;
30: import org.cougaar.core.component.ServiceBroker;
31: import org.cougaar.core.component.ServiceProvider;
32: import org.cougaar.core.service.LoggingService;
33:
34: /**
35: * This {@link ServiceProvider} provides the {@link
36: * LinkSelectionPolicy} service. If no implementation of that service
37: * has been loaded at the time this singleton is made, it will create
38: * a default implementation, using {@link MinCostLinkSelectionPolicy}.
39: */
40: public class LinkSelectionPolicyServiceProvider implements
41: ServiceProvider {
42:
43: private LinkSelectionPolicy policy;
44: private LoggingService loggingService;
45:
46: LinkSelectionPolicyServiceProvider(ServiceBroker sb,
47: Container container) {
48: loggingService = (LoggingService) sb.getService(this ,
49: LoggingService.class, null);
50: LinkSelectionProvisionService lsp = (LinkSelectionProvisionService) sb
51: .getService(this , LinkSelectionProvisionService.class,
52: null);
53: policy = lsp.getPolicy();
54: if (policy == null) {
55: policy = new MinCostLinkSelectionPolicy();
56: container.add(policy);
57: }
58: }
59:
60: public Object getService(ServiceBroker sb, Object requestor,
61: Class serviceClass) {
62: if (serviceClass == LinkSelectionPolicy.class) {
63: if (requestor instanceof DestinationQueueImpl)
64: return policy;
65: else if (loggingService.isErrorEnabled())
66: loggingService
67: .error("Illegal request for LinkSelectionPolicy from "
68: + requestor);
69: }
70: return null;
71: }
72:
73: public void releaseService(ServiceBroker sb, Object requestor,
74: Class serviceClass, Object service) {
75: if (serviceClass == LinkSelectionPolicy.class) {
76: // ??
77: }
78: }
79:
80: }
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