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.qos.metrics;
28:
29: import java.util.Observer;
30: import java.util.Properties;
31:
32: /**
33: * Null MetricsSevice implementation that always returnds 0 `*
34: * credibility Metrics.
35: */
36: public class NullMetricsServiceImpl implements MetricsService,
37: DataFeedRegistrationService {
38: public Metric getValue(String path) {
39: return MetricImpl.UndefinedMetric;
40: }
41:
42: public Metric getValue(String path, Properties qos_tags) {
43: return MetricImpl.UndefinedMetric;
44: }
45:
46: public Metric getValue(String path, VariableEvaluator eval) {
47: return MetricImpl.UndefinedMetric;
48: }
49:
50: public Metric getValue(String path, VariableEvaluator eval,
51: Properties qos_tags) {
52: return MetricImpl.UndefinedMetric;
53: }
54:
55: public Object subscribeToValue(String path, Observer observer) {
56: return null;
57: }
58:
59: public Object subscribeToValue(String path, Observer observer,
60: MetricNotificationQualifier qualifier) {
61: return null;
62: }
63:
64: public Object subscribeToValue(String path, Observer observer,
65: VariableEvaluator eval) {
66: return null;
67: }
68:
69: public Object subscribeToValue(String path, Observer observer,
70: VariableEvaluator eval,
71: MetricNotificationQualifier qualifier) {
72: return null;
73: }
74:
75: public void unsubscribeToValue(Object subscription_handle) {
76: }
77:
78: public boolean registerFeed(Object feed, String name) {
79: return false;
80: }
81:
82: public void populateSites(String sitesURLString) {
83: }
84:
85: };
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