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.core.blackboard;
28:
29: import java.io.Serializable;
30:
31: /**
32: * A marker interface for describing a change to an object on the
33: * blackboard.
34: * <p>
35: * ChangeReports are published by using {@link
36: * org.cougaar.core.service.BlackboardService#publishChange(Object,Collection)}
37: * and are viewed by using {@link
38: * CollectionSubscription#getChangeReports(Object)}.
39: * <p>
40: * Subclasses describe specific types of changes.
41: * <p>
42: * The hashCode and equals methods should compute their return values
43: * based on the type and not any specific (old) value which may be
44: * stored in the object. This allows use of set operations on
45: * ChangeReport instances to filter out redundant reports.
46: * <p>
47: * Implementations should be as compact as possible and must be
48: * Serializable so that they can be sent between agents and
49: * persisted.
50: */
51: public interface ChangeReport extends Serializable {
52: }
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