/*
* Copyright 2008-2017 by Emeric Vernat
*
* This file is part of Java Melody.
*
* 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 net.bull.javamelody;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
/**
* Abstract Filter of monitoring JavaMelody for Jenkins/JIRA/Bamboo/Confluence with emulated session listener.
* @author Emeric Vernat
*/
public abstract class PluginMonitoringFilter extends MonitoringFilter {
private final SessionListener emulatedSessionListener = new SessionListener(true);
/** {@inheritDoc} */
@Override
public void init(FilterConfig config) throws ServletException {
super.init(config);
final FilterContext filterContext = getFilterContext();
if (filterContext != null) {
final TimerTask sessionTimerTask = new TimerTask() {
/** {@inheritDoc} */
@Override
public void run() {
try {
unregisterInvalidatedSessions();
} catch (final Throwable t) { // NOPMD
LOG.warn("exception while checking sessions", t);
}
}
};
final int resolutionSeconds = Parameters.getResolutionSeconds();
final int periodMillis = resolutionSeconds * 1000;
final Timer timer = filterContext.getTimer();
timer.schedule(sessionTimerTask, periodMillis - 5 * 1000, periodMillis);
}
}
/** {@inheritDoc} */
@Override
public void destroy() {
// évitons ClassNotFoundException: net.bull.javamelody.SessionListener,
// au redémarrage de Tomcat, cf 8344 dans bugs Jenkins:
// http://issues.jenkins-ci.org/browse/JENKINS-8344
emulatedSessionListener.removeAllActivationListeners();
super.destroy();
}
/** {@inheritDoc} */
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
if (!(request instanceof HttpServletRequest)) {
super.doFilter(request, response, chain);
return;
}
final HttpServletRequest httpRequest = (HttpServletRequest) request;
registerSessionIfNeeded(httpRequest);
super.doFilter(request, response, chain);
// si logout on prend en compte de suite la destruction de la session
unregisterSessionIfNeeded(httpRequest);
}
private void registerSessionIfNeeded(HttpServletRequest httpRequest) {
// rq: cette session peut-être dors et déjà invalide et c'est pourquoi on vérifie
// isRequestedSessionIdValid
if (httpRequest.isRequestedSessionIdValid()) {
final HttpSession session = httpRequest.getSession(false);
emulatedSessionListener.registerSessionIfNeeded(session);
}
}
private void unregisterSessionIfNeeded(HttpServletRequest httpRequest) {
final HttpSession session = httpRequest.getSession(false);
emulatedSessionListener.unregisterSessionIfNeeded(session);
}
void unregisterInvalidatedSessions() {
emulatedSessionListener.unregisterInvalidatedSessions();
}
}