01: /*
02: * <copyright>
03: *
04: * Copyright 2001-2004 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 org.cougaar.core.component.Service;
30: import org.cougaar.util.UnaryPredicate;
31:
32: /**
33: * This service provides primitive blackboard metrics.
34: * <p>
35: * Also see the {@link BlackboardQueryService}.
36: */
37: public interface BlackboardMetricsService extends Service {
38:
39: /**
40: * Get a count of the total number of objects currently
41: * found in the Blackboard.
42: * <p>
43: * Equivalent to "getBlackboardCount(Object.class)".
44: */
45: int getBlackboardCount();
46:
47: /**
48: * Get a count of all instances of the given type currently found
49: * in the Blackboard.
50: * <p>
51: * This is more efficient than the equivalent predicate-based
52: * approach.
53: */
54: int getBlackboardCount(Class cl);
55:
56: /**
57: * Get a count of objects currently in the Blackboard that
58: * match the given predicate.
59: */
60: int getBlackboardCount(UnaryPredicate predicate);
61:
62: }
|