Java tutorial
/******************************************************************************* * Copyright (c) 2012 by committers of lunifera.org * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Information: * Based on original sources of * - org.vaadin.artur.icepush.ICEPushServlet from Arthur Signell * * Contributors: * Florian Pirchner - implementation * *******************************************************************************/ package org.lunifera.runtime.web.gyrex.vaadin.internal; import java.io.IOException; import java.util.Dictionary; import java.util.HashSet; import java.util.Iterator; import java.util.Set; import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.icepush.servlet.MainServlet; import org.lunifera.web.vaadin.common.Constants; import org.lunifera.web.vaadin.common.OSGiUI; import org.lunifera.web.vaadin.common.OSGiUIProvider; import org.osgi.framework.BundleContext; import org.osgi.framework.InvalidSyntaxException; import org.osgi.framework.ServiceReference; import org.osgi.service.component.ComponentFactory; import org.osgi.util.tracker.ServiceTracker; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.vaadin.artur.icepush.ICEPush; import org.vaadin.artur.icepush.JavascriptProvider; import com.vaadin.server.DeploymentConfiguration; import com.vaadin.server.VaadinRequest; import com.vaadin.server.VaadinServlet; import com.vaadin.server.VaadinSession; /** * Used to create instances of applications that have been registered with the * container via a component factory. * */ @SuppressWarnings("rawtypes") public class VaadinOSGiServlet extends VaadinServlet { private static final long serialVersionUID = 1L; private MainServlet iCEPushServlet; private JavascriptProvider javascriptProvider; private UiProviderTracker tracker; private Dictionary webAppProperties; /** * Default constructor. * * @param webAppProperties * The properties specified by the vaadin http application OSGi * service. */ public VaadinOSGiServlet(Dictionary webAppProperties) { this.webAppProperties = webAppProperties; } @Override public void init(ServletConfig servletConfig) throws ServletException { try { super.init(servletConfig); } catch (ServletException e) { if (e.getMessage().equals("Application not specified in servlet parameters")) { // Ignore if application is not specified to allow the same // servlet to be used for only push in portals } else { throw e; } } try { tracker = new UiProviderTracker(VaadinActivator.getInstance().getBundle().getBundleContext()); tracker.open(); } catch (InvalidSyntaxException e) { throw new ServletException(e); } iCEPushServlet = new MainServlet(servletConfig.getServletContext()); try { javascriptProvider = new JavascriptProvider(getServletContext().getContextPath()); ICEPush.setCodeJavascriptLocation(javascriptProvider.getCodeLocation()); } catch (IOException e) { throw new ServletException("Error initializing JavascriptProvider", e); } } @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String pathInfo = request.getPathInfo(); if (pathInfo != null && pathInfo.equals("/" + javascriptProvider.getCodeName())) { // Serve icepush.js serveIcePushCode(request, response); return; } if (request.getRequestURI().endsWith(".icepush")) { // Push request try { iCEPushServlet.service(request, response); } catch (ServletException e) { throw e; } catch (IOException e) { throw e; } catch (Exception e) { throw new RuntimeException(e); } } else { // Vaadin request super.service(request, response); } } private void serveIcePushCode(HttpServletRequest request, HttpServletResponse response) throws IOException { String icepushJavscript = javascriptProvider.getJavaScript(); response.setHeader("Content-Type", "text/javascript"); response.getOutputStream().write(icepushJavscript.getBytes()); } @Override protected OSGiServletService createServletService(DeploymentConfiguration deploymentConfiguration) { OSGiServletService service = new OSGiServletService(this, deploymentConfiguration, webAppProperties, new OSGiServletService.IVaadinSessionFactory() { @Override public VaadinSession createSession(VaadinRequest request, HttpServletRequest httpServletRequest) { VaadinSession session = new VaadinSession(request.getService()); for (UiProviderInfo info : tracker.getInfos()) { session.addUIProvider(new OSGiUIProvider(info.getFactory(), info.getProviderClass())); } return session; } }); return service; } @Override public void destroy() { super.destroy(); if (tracker != null) { tracker.close(); tracker = null; } iCEPushServlet.shutdown(); } @SuppressWarnings("unchecked") public class UiProviderTracker extends ServiceTracker { private final Logger logger = LoggerFactory.getLogger(UiProviderTracker.class); private final Set<UiProviderInfo> infos = new HashSet<UiProviderInfo>(); public UiProviderTracker(BundleContext ctx) throws InvalidSyntaxException { super(ctx, ctx.createFilter("(component.factory=" + Constants.OSGI_COMP_FACTORY__VAADIN_UI + "/*)"), null); } public Set<UiProviderInfo> getInfos() { return infos; } @Override public Object addingService(ServiceReference reference) { Object o = super.addingService(reference); if (o instanceof ComponentFactory) { ComponentFactory factory = (ComponentFactory) o; String name = (String) reference.getProperty("component.factory"); String className = name.substring(Constants.PREFIX__UI_CLASS.length()); try { Class<? extends OSGiUI> clazz = (Class<? extends OSGiUI>) reference.getBundle() .loadClass(className); infos.add(new UiProviderInfo(factory, clazz)); logger.info(String.format("Added %s as UiProvider", clazz.getName())); } catch (ClassNotFoundException e) { logger.error("{}", e); throw new RuntimeException(e); } } return o; } @Override public void removedService(ServiceReference reference, Object service) { if (service instanceof ComponentFactory) { ComponentFactory factory = (ComponentFactory) service; for (Iterator<UiProviderInfo> iterator = infos.iterator(); iterator.hasNext();) { UiProviderInfo info = iterator.next(); if (info.getFactory() == factory) { iterator.remove(); break; } } } } } public static class UiProviderInfo { private final ComponentFactory factory; private final Class<? extends OSGiUI> clazz; public UiProviderInfo(ComponentFactory factory, Class<? extends OSGiUI> clazz) { super(); this.factory = factory; this.clazz = clazz; } public ComponentFactory getFactory() { return factory; } public Class<? extends OSGiUI> getProviderClass() { return clazz; } } }