01: /*
02: * Copyright 2002-2006 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.web.context.support;
18:
19: import org.apache.commons.logging.Log;
20: import org.apache.commons.logging.LogFactory;
21:
22: import org.springframework.context.ApplicationEvent;
23: import org.springframework.context.ApplicationListener;
24: import org.springframework.util.ResponseTimeMonitorImpl;
25:
26: /**
27: * Listener that logs the response times of web requests.
28: * To be registered as bean in a WebApplicationContext.
29: *
30: * <p>Logs performance statistics using Commons Logging at "trace" level.
31: *
32: * @author Rod Johnson
33: * @author Juergen Hoeller
34: * @since January 21, 2001
35: * @see RequestHandledEvent
36: */
37: public class PerformanceMonitorListener implements ApplicationListener {
38:
39: protected final Log logger = LogFactory.getLog(getClass());
40:
41: protected final ResponseTimeMonitorImpl responseTimeMonitor = new ResponseTimeMonitorImpl();
42:
43: public void onApplicationEvent(ApplicationEvent event) {
44: if (event instanceof RequestHandledEvent) {
45: RequestHandledEvent rhe = (RequestHandledEvent) event;
46: this .responseTimeMonitor.recordResponseTime(rhe
47: .getProcessingTimeMillis());
48: if (logger.isTraceEnabled()) {
49: // Stringifying objects is expensive. Don't do it unless it will show.
50: logger.trace("PerformanceMonitorListener: last=["
51: + rhe.getProcessingTimeMillis() + "ms]; "
52: + this .responseTimeMonitor + "; "
53: + rhe.getShortDescription());
54: }
55: }
56: }
57:
58: }
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