01: /*
02: * Copyright 2002-2005 the original author or authors.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
16:
17: package org.springframework.util;
18:
19: /**
20: * Interface implemented by objects that can provide performance information
21: * as well as a record of the number of times they are accessed.
22: *
23: * <p>Implementing objects must ensure that implementing this interface
24: * does <b>not</b> compromise thread safety. However, it may be acceptable
25: * for slight innaccuracies in reported statistics to result from the
26: * avoidance of synchronization: performance may be well be more important
27: * than exact reporting, so long as the errors are not likely to be misleading.
28: *
29: * @author Rod Johnson
30: * @since November 21, 2000
31: */
32: public interface ResponseTimeMonitor {
33:
34: /**
35: * Return the number of accesses to this resource.
36: */
37: int getAccessCount();
38:
39: /**
40: * Return the average response time in milliseconds.
41: */
42: int getAverageResponseTimeMillis();
43:
44: /**
45: * Return the best (quickest) response time in milliseconds.
46: */
47: int getBestResponseTimeMillis();
48:
49: /**
50: * Return the worst (slowest) response time in milliseconds.
51: */
52: int getWorstResponseTimeMillis();
53:
54: }
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