org.springframework.web.context.support.PerformanceMonitorListener Maven / Gradle / Ivy
/*
* Copyright 2002-2006 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.context.support;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.util.ResponseTimeMonitorImpl;
/**
* Listener that logs the response times of web requests.
* To be registered as bean in a WebApplicationContext.
*
* Logs performance statistics using Commons Logging at "trace" level.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since January 21, 2001
* @see RequestHandledEvent
*/
public class PerformanceMonitorListener implements ApplicationListener {
protected final Log logger = LogFactory.getLog(getClass());
protected final ResponseTimeMonitorImpl responseTimeMonitor = new ResponseTimeMonitorImpl();
public void onApplicationEvent(ApplicationEvent event) {
if (event instanceof RequestHandledEvent) {
RequestHandledEvent rhe = (RequestHandledEvent) event;
this.responseTimeMonitor.recordResponseTime(rhe.getProcessingTimeMillis());
if (logger.isTraceEnabled()) {
// Stringifying objects is expensive. Don't do it unless it will show.
logger.trace("PerformanceMonitorListener: last=[" + rhe.getProcessingTimeMillis() + "ms]; " +
this.responseTimeMonitor + "; " + rhe.getShortDescription());
}
}
}
}