01: /*
02: * <copyright>
03: *
04: * Copyright 2003-2004 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.service;
28:
29: import java.util.Set;
30:
31: import org.cougaar.core.adaptivity.Condition;
32: import org.cougaar.core.component.Service;
33: import org.cougaar.core.persist.NotPersistable;
34:
35: /**
36: * This service is used by the {@link
37: * org.cougaar.core.adaptivity.AdaptivityEngine} to look up sensor
38: * data on the blackboard.
39: */
40: public interface ConditionService extends Service {
41: /**
42: * The interface to be implemented by listener objects for this
43: * service. Note that no implementation of the methods of this
44: * interface should do any more than set variables within the
45: * object. In particular, they should not use any services or
46: * synchronize on or wait for anything.
47: *
48: * There are currently no methods defined
49: */
50: interface Listener extends NotPersistable {
51: }
52:
53: /**
54: * Get a Condition object by name.
55: */
56: Condition getConditionByName(String sensor);
57:
58: /**
59: * Get the names of all known Conditions.
60: */
61: Set getAllConditionNames();
62:
63: /**
64: * Add a listener object. The given object will be publishChanged
65: * whenever any Condition is added, removed, or changed. The
66: * Object must already have been publishedAdded to the blackboard by
67: * the caller.
68: */
69: void addListener(Listener cb);
70:
71: /**
72: * Remove a listener object. The given object will no longer be
73: * publishChanged whenever any Condition is added, removed,
74: * or changed. The Object should not be removed from the blackboard
75: * until it has been removed as a listener.
76: */
77: void removeListener(Listener cb);
78: }
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