org.lunifera.runtime.web.vaadin.standalone.servlet.VaadinOSGiServlet.java Source code

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Here is the source code for org.lunifera.runtime.web.vaadin.standalone.servlet.VaadinOSGiServlet.java

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/*******************************************************************************
 * 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.vaadin.standalone.servlet;

import java.io.IOException;

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.runtime.web.vaadin.standalone.common.IVaadinWebApplication;
import org.lunifera.web.vaadin.common.OSGiUIProvider;
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.
 * 
 */
public class VaadinOSGiServlet extends VaadinServlet {

    private static final long serialVersionUID = 1L;

    private MainServlet iCEPushServlet;
    private JavascriptProvider javascriptProvider;

    private IVaadinWebApplication webApplication;

    /**
     * Default constructor.
     * 
     * @param webApplication
     *            The vaadin web application.
     */
    public VaadinOSGiServlet(IVaadinWebApplication webApplication) {
        this.webApplication = webApplication;
    }

    @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;
            }
        }

        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) {

        // create the servlet service initialized with the ui provider
        OSGiServletService service = new OSGiServletService(this, deploymentConfiguration,
                new OSGiServletService.IVaadinSessionFactory() {
                    @Override
                    public VaadinSession createSession(VaadinRequest request,
                            HttpServletRequest httpServletRequest) {
                        VaadinSession session = new VaadinSession(request.getService());
                        for (OSGiUIProvider provider : webApplication.getUiProviders()) {
                            session.addUIProvider(provider);
                        }
                        return session;
                    }
                });
        return service;
    }

    @Override
    public void destroy() {
        super.destroy();

        iCEPushServlet.shutdown();
    }

}