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SessionActivationServlet.java
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SessionActivationServlet.java
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/*
* JBoss, Home of Professional Open Source.
* Copyright 2019, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.test.clustering.cluster.web.event;
import java.io.IOException;
import java.io.NotSerializableException;
import java.io.Serializable;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionActivationListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
import javax.servlet.http.HttpSessionEvent;
import net.jcip.annotations.Immutable;
/**
* @author Paul Ferraro
*/
@WebServlet(urlPatterns = { SessionActivationServlet.SERVLET_PATH })
public class SessionActivationServlet extends HttpServlet {
private static final long serialVersionUID = 1000811377717375782L;
private static final String SERVLET_NAME = "activation";
static final String SERVLET_PATH = "/" + SERVLET_NAME;
private static final String IMMUTABLE_ATTRIBUTE_NAME = "immutable";
private static final String MUTABLE_ATTRIBUTE_NAME = "mutable";
public static URI createURI(URL baseURL) throws URISyntaxException {
return createURI(baseURL.toURI());
}
public static URI createURI(URI baseURI) {
return baseURI.resolve(SERVLET_NAME);
}
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.getServletContext().log(String.format("[%s] %s", request.getMethod(), request.getRequestURI()));
super.service(request, response);
}
@Override
protected void doPut(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
SessionActivationListener listener = new ImmutableSessionActivationListener(true);
session.setAttribute(IMMUTABLE_ATTRIBUTE_NAME, listener);
listener.assertActive();
listener = new MutableSessionActivationListener(true);
session.setAttribute(MUTABLE_ATTRIBUTE_NAME, listener);
listener.assertActive();
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
((SessionActivationListener) session.getAttribute(IMMUTABLE_ATTRIBUTE_NAME)).assertActive();
((SessionActivationListener) session.getAttribute(MUTABLE_ATTRIBUTE_NAME)).assertActive();
}
@Override
protected void doDelete(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
session.removeAttribute(IMMUTABLE_ATTRIBUTE_NAME);
session.removeAttribute(MUTABLE_ATTRIBUTE_NAME);
}
private static class MutableSessionActivationListener extends SessionActivationListener {
private static final long serialVersionUID = 7944013938798510317L;
MutableSessionActivationListener(boolean active) {
super(active);
}
}
@Immutable
private static class ImmutableSessionActivationListener extends SessionActivationListener {
private static final long serialVersionUID = -6294242158180373273L;
ImmutableSessionActivationListener(boolean active) {
super(active);
}
}
private abstract static class SessionActivationListener implements HttpSessionActivationListener, HttpSessionBindingListener, Serializable {
private static final long serialVersionUID = 8262547876438811845L;
private transient boolean active = false;
SessionActivationListener(boolean active) {
this.active = active;
}
public void assertActive() {
if (!this.active) {
throw new IllegalStateException(String.format("%s.sessionDidActivate(...) not invoked", this.getClass().getSimpleName()));
}
}
@Override
public void sessionWillPassivate(HttpSessionEvent event) {
if (!this.active) {
throw new IllegalStateException(String.format("%s.sessionWillPassivate(...) already invoked", this.getClass().getSimpleName()));
}
this.active = false;
}
@Override
public void sessionDidActivate(HttpSessionEvent event) {
if (this.active) {
throw new IllegalStateException(String.format("%s.sessionDidActivate(...) already invoked", this.getClass().getSimpleName()));
}
this.active = true;
}
@Override
public void valueBound(HttpSessionBindingEvent event) {
this.assertActive();
}
@Override
public void valueUnbound(HttpSessionBindingEvent event) {
this.assertActive();
}
private void writeObject(java.io.ObjectOutputStream out) throws IOException {
if (this.active) {
throw new NotSerializableException(String.format("%s.sessionWillPassivate(...) not invoked", this.getClass().getSimpleName()));
}
out.defaultWriteObject();
}
}
}