Examples of org.apache.tapestry.ApplicationServlet

org.apache.tapestry.ApplicationServlet
Links a servlet container with a Tapestry application. The servlet has some responsibilities related to bootstrapping the application (in terms of logging, reading the {@link ApplicationSpecification specification}, etc.). It is also responsible for creating or locating the {@link IEngine} and delegatingincoming requests to it.
The servlet init parameter org.apache.tapestry.specification-path should be set to the complete resource path (within the classpath) to the application specification, i.e., /com/foo/bar/MyApp.application.
In some servlet containers (notably WebLogic) it is necessary to invoke {@link HttpSession#setAttribute(String,Object)}in order to force a persistent value to be replicated to the other servers in the cluster. Tapestry applications usually only have a single persistent value, the {@link IEngine engine}. For persistence to work in such an environment, the JVM system property org.apache.tapestry.store-engine must be set to true. This will force the application servlet to restore the engine into the {@link HttpSession} at theend of each request cycle.
As of release 1.0.1, it is no longer necessary for a {@link HttpSession}to be created on the first request cycle. Instead, the HttpSession is created as needed by the {@link IEngine} ... that is, when a visit object is created,or when persistent page state is required. Otherwise, for sessionless requests, an {@link IEngine} from a {@link Pool} is used. Additional work must be doneso that the {@link IEngine} can change locale without forcing the creation of a session; this involves the servlet and the engine storing locale information in a {@link Cookie}. @version $Id: ApplicationServlet.java 244163 2005-03-17 05:18:32Z pferraro $ @author Howard Lewis Ship

        servletContext.addInitParameter(ContextLoader.CONFIG_LOCATION_PARAM, "classpath:org/springmodules/web/tapestry/applicationContext.xml");
        ContextLoader contextLoader = new ContextLoader();
        contextLoader.initWebApplicationContext(servletContext);


        MockServletConfig servletConfig = new MockServletConfig(servletContext, "servlet");
        ApplicationServlet servlet = new ApplicationServlet();
        servlet.init(servletConfig);


        Registry hiveMindRegistry = (Registry) servletContext.getAttribute("org.apache.tapestry.Registry:servlet");
        assertNotNull("HiveMind registry is not available in servlet context", hiveMindRegistry);


        BeanFactory beanFactory = (BeanFactory) hiveMindRegistry.getService("hivemind.lib.DefaultSpringBeanFactory", BeanFactory.class);

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        if (_localeChanged)
        {
            _localeChanged = false;


            RequestContext context = cycle.getRequestContext();
            ApplicationServlet servlet = context.getServlet();


            servlet.writeLocaleCookie(_locale, this, context);
        }


        // Commit all changes and ignore further changes.


        IPage page = cycle.getPage();

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     *
     **/


    public boolean service(RequestContext context) throws ServletException, IOException
    {
        ApplicationServlet servlet = context.getServlet();
        IRequestCycle cycle = null;
        ResponseOutputStream output = null;
        IMonitor monitor = null;


        if (LOG.isDebugEnabled())
            LOG.debug("Begin service " + context.getRequestURI());


        if (_specification == null)
            _specification = servlet.getApplicationSpecification();


        // The servlet invokes setLocale() before invoking service().  We want
        // to ignore that setLocale() ... that is, not force a cookie to be
        // written.


        _localeChanged = false;


        if (_resolver == null)
            _resolver = servlet.getResourceResolver();


        try
        {
            setupForRequest(context);

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    protected IPropertySource createPropertySource(RequestContext context)
    {
        DelegatingPropertySource result = new DelegatingPropertySource();


        ApplicationServlet servlet = context.getServlet();
        IApplicationSpecification spec = servlet.getApplicationSpecification();


        result.addSource(new PropertyHolderPropertySource(spec));
        result.addSource(new ServletPropertySource(servlet.getServletConfig()));
        result.addSource(new ServletContextPropertySource(servlet.getServletContext()));


        if (spec.checkExtension(EXTENSION_PROPERTY_SOURCE_NAME))
        {
            IPropertySource source =
                (IPropertySource) spec.getExtension(

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    public void initialize(IRequestCycle cycle)
    {
        if (!init)
        {
            RequestContext requestContext = cycle.getRequestContext();
            ApplicationServlet servlet = requestContext.getServlet();
            ServletContext context = servlet.getServletContext();
            IPropertySource propertySource = cycle.getEngine().getPropertySource();


            Resource webInfLocation = new ContextResource(context, "/WEB-INF/");


            Resource webInfAppLocation =
                webInfLocation.getRelativeResource(servlet.getServletName() + "/");


            readQuestions(
                easyQuestions,
                webInfAppLocation,
                propertySource.getPropertyValue("easyquestionsfile"));

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        if (_localeChanged)
        {
            _localeChanged = false;


            RequestContext context = cycle.getRequestContext();
            ApplicationServlet servlet = context.getServlet();


            servlet.writeLocaleCookie(_locale, this, context);
        }


        // Commit all changes and ignore further changes.


        IPage page = cycle.getPage();

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     *
     **/


    public boolean service(RequestContext context) throws ServletException, IOException
    {
        ApplicationServlet servlet = context.getServlet();
        IRequestCycle cycle = null;
        ResponseOutputStream output = null;
        IMonitor monitor = null;


        if (LOG.isDebugEnabled())
            LOG.debug("Begin service " + context.getRequestURI());


        if (_specification == null)
            _specification = servlet.getApplicationSpecification();


        // The servlet invokes setLocale() before invoking service().  We want
        // to ignore that setLocale() ... that is, not force a cookie to be
        // written.


        _localeChanged = false;


        if (_resolver == null)
            _resolver = servlet.getResourceResolver();


        try
        {
            setupForRequest(context);

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    protected IPropertySource createPropertySource(RequestContext context)
    {
        DelegatingPropertySource result = new DelegatingPropertySource();


        ApplicationServlet servlet = context.getServlet();
        IApplicationSpecification spec = servlet.getApplicationSpecification();


        result.addSource(new PropertyHolderPropertySource(spec));
        result.addSource(new ServletPropertySource(servlet.getServletConfig()));
        result.addSource(new ServletContextPropertySource(servlet.getServletContext()));


        if (spec.checkExtension(EXTENSION_PROPERTY_SOURCE_NAME))
        {
            IPropertySource source =
                (IPropertySource) spec.getExtension(

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    public void initialize(IRequestCycle cycle)
    {
        if (!init)
        {
            RequestContext requestContext = cycle.getRequestContext();
            ApplicationServlet servlet = requestContext.getServlet();
            ServletContext context = servlet.getServletContext();
            IPropertySource propertySource = cycle.getEngine().getPropertySource();


            Resource webInfLocation = new ContextResource(context, "/WEB-INF/");


            Resource webInfAppLocation =
                webInfLocation.getRelativeResource(servlet.getServletName() + "/");


            readQuestions(
                easyQuestions,
                webInfAppLocation,
                propertySource.getPropertyValue("easyquestionsfile"));

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    public void initialize(IRequestCycle cycle)
    {
        if (!init)
        {
            RequestContext requestContext = cycle.getRequestContext();
            ApplicationServlet servlet = requestContext.getServlet();
            ServletContext context = servlet.getServletContext();
            IPropertySource propertySource = cycle.getEngine().getPropertySource();
            IResourceLocation webInfLocation = new ContextResourceLocation(context, "/WEB-INF/");
            IResourceLocation webInfAppLocation = webInfLocation.getRelativeLocation(servlet.getServletName() + "/");
            readQuestions(easyQuestions, webInfAppLocation, propertySource.getPropertyValue("easyquestionsfile"));
            readQuestions(mediumQuestions, webInfAppLocation, propertySource.getPropertyValue("mediumquestiosfile"));
            readQuestions(hardQuestions, webInfAppLocation, propertySource.getPropertyValue("hardquestionsfile"));
            points = new int[10];
            names = new String[10];

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