com.vaadin.server.LegacyVaadinServlet Maven / Gradle / Ivy
/*
* Copyright (C) 2000-2024 Vaadin Ltd
*
* This program is available under Vaadin Commercial License and Service Terms.
*
* See for the full
* license.
*/
package com.vaadin.server;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import com.vaadin.util.ReflectTools;
public class LegacyVaadinServlet extends VaadinServlet {
private static final UIProvider PROVIDER = new LegacyApplicationUIProvider() {
@Override
protected LegacyApplication createApplication() {
VaadinServlet servlet = VaadinServlet.getCurrent();
if (servlet instanceof LegacyVaadinServlet) {
LegacyVaadinServlet legacyServlet = (LegacyVaadinServlet) servlet;
HttpServletRequest request = VaadinServletService
.getCurrentServletRequest();
try {
if (legacyServlet.shouldCreateApplication(request)) {
return legacyServlet.getNewApplication(request);
}
} catch (ServletException e) {
throw new RuntimeException(e);
}
}
return null;
}
};
@Override
public void init(ServletConfig servletConfig) throws ServletException {
super.init(servletConfig);
getService().addSessionInitListener((SessionInitEvent event) -> {
try {
onVaadinSessionStarted(event.getRequest(), event.getSession());
} catch (ServletException e) {
throw new ServiceException(e);
}
});
}
protected Class getApplicationClass()
throws ClassNotFoundException {
try {
return ServletPortletHelper.getLegacyApplicationClass(getService());
} catch (ServiceException e) {
throw new RuntimeException(e);
}
}
protected LegacyApplication getNewApplication(HttpServletRequest request)
throws ServletException {
try {
Class applicationClass = getApplicationClass();
return ReflectTools.createInstance(applicationClass);
} catch (Exception e) {
throw new ServletException(e);
}
}
protected boolean shouldCreateApplication(HttpServletRequest request)
throws ServletException {
return true;
}
private void onVaadinSessionStarted(VaadinRequest request,
VaadinSession session) throws ServletException {
session.addUIProvider(PROVIDER);
}
}