/*
* Copyright 2002-2008 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.filter;
import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Logger;
import org.apache.log4j.NDC;
/**
* Request logging filter that adds the request log message to the Log4J
* nested diagnostic context (NDC) before the request is processed,
* removing it again after the request is processed.
*
* @author Juergen Hoeller
* @author Rob Harrop
* @since 1.2.5
* @see #setIncludeQueryString
* @see #setBeforeMessagePrefix
* @see #setBeforeMessageSuffix
* @see #setAfterMessagePrefix
* @see #setAfterMessageSuffix
* @see org.apache.log4j.NDC#push(String)
* @see org.apache.log4j.NDC#pop()
*/
public class Log4jNestedDiagnosticContextFilter extends AbstractRequestLoggingFilter {
/** Logger available to subclasses */
protected final Logger log4jLogger = Logger.getLogger(getClass());
/**
* Logs the before-request message through Log4J and
* adds a message the Log4J NDC before the request is processed.
*/
protected void beforeRequest(HttpServletRequest request, String message) {
if (log4jLogger.isDebugEnabled()) {
log4jLogger.debug(message);
}
NDC.push(getNestedDiagnosticContextMessage(request));
}
/**
* Determine the message to be pushed onto the Log4J nested diagnostic context.
* <p>Default is a plain request log message without prefix or suffix.
* @param request current HTTP request
* @return the message to be pushed onto the Log4J NDC
* @see #createMessage
*/
protected String getNestedDiagnosticContextMessage(HttpServletRequest request) {
return createMessage(request, "", "");
}
/**
* Removes the log message from the Log4J NDC after the request is processed
* and logs the after-request message through Log4J.
*/
protected void afterRequest(HttpServletRequest request, String message) {
NDC.pop();
if (NDC.getDepth() == 0) {
NDC.remove();
}
if (log4jLogger.isDebugEnabled()) {
log4jLogger.debug(message);
}
}
}