Examples of org.mortbay.util.ajax.Continuation

org.mortbay.util.ajax.Continuation
Continuation. A continuation is a mechanism by which a HTTP Request can be suspended and restarted after a timeout or an asynchronous event has occured. Blocking continuations will block the process of the request during a call to {@link #suspend(long)}. Non-blocking continuation can abort the current request and arrange for it to be retried when {@link #resume()} is called or the timeout expires.In order to supprt non-blocking continuations, it is important that all actions taken by a filter or servlet before a call to {@link #suspend(long)} are either idempotent (can be retried) orare made conditional on {@link #isPending} so they are not performed on retried requests. With the appropriate HTTP Connector, this allows threadless waiting for events (see {@link org.mortbay.jetty.nio.SelectChannelConnector}). @author gregw

    {
        synchronized(request)
        {
            request.removeAttribute("org.apache.tomcat.comet");
            
            Continuation continuation=ContinuationSupport.getContinuation(request,request);
            if (continuation.isPending())
                continuation.resume();
        }
    }

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    {
        synchronized(request)
        {
            // TODO: wrap response so we can reset timeout on writes.
            
            Continuation continuation=ContinuationSupport.getContinuation(request,request);
            
            if (!continuation.isPending())
                begin(request,response);
            
            Integer timeout=(Integer)request.getAttribute("org.apache.tomcat.comet.timeout");
            boolean resumed=continuation.suspend(timeout==null?60000:timeout.intValue());
            
            if (!resumed)
                error(request,response);
        }
    }

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        if (request.getParameter("continue")!=null)
        {
            try
            {
                Continuation continuation = ContinuationSupport.getContinuation(request, null);
                continuation.suspend(Long.parseLong(request.getParameter("continue")));
            }
            catch(Exception e)
            {
                throw new ServletException(e);
            }
        }
            
        request.setAttribute("Dump", this);
        getServletContext().setAttribute("Dump",this);
        // getServletContext().log("dump "+request.getRequestURI());


        // Force a content length response
        String length= request.getParameter("length");
        if (length != null && length.length() > 0)
        {
            response.setContentLength(Integer.parseInt(length));
        }


        // Handle a dump of data
        String data= request.getParameter("data");
        String block= request.getParameter("block");
        String dribble= request.getParameter("dribble");
        if (data != null && data.length() > 0)
        {
            long d=Long.parseLong(data);
            int b=(block!=null&&block.length()>0)?Integer.parseInt(block):50;
            byte[] buf=new byte[b];
            for (int i=0;i<b;i++)
            {
                
                buf[i]=(byte)('0'+(i%10));
                if (i%10==9)
                    buf[i]=(byte)'\n';
            }
            buf[0]='o';
            OutputStream out=response.getOutputStream();
            response.setContentType("text/plain");
            while (d > 0)
            {
                if (b==1)
                {
                    out.write(d%80==0?'\n':'.');
                    d--;
                }
                else if (d>=b)
                {
                    out.write(buf);
                    d=d-b;
                }
                else
                {
                    out.write(buf,0,(int)d);
                    d=0;
                }
                
                if (dribble!=null)
                {
                    out.flush();
                    try
                    {
                        Thread.sleep(Long.parseLong(dribble));
                    }
                    catch (Exception e)
                    {
                        e.printStackTrace();
                        break;
                    }
                }
                
            }
            
            return;
        }


        // Handle a dump of data
        String chars= request.getParameter("chars");
        if (chars != null && chars.length() > 0)
        {
            long d=Long.parseLong(chars);
            int b=(block!=null&&block.length()>0)?Integer.parseInt(block):50;
            char[] buf=new char[b];
            for (int i=0;i<b;i++)
            {
                buf[i]=(char)('0'+(i%10));
                if (i%10==9)
                    buf[i]='\n';
            }
            buf[0]='o';
            response.setContentType("text/plain");
            PrintWriter out=response.getWriter();
            while (d > 0 && !out.checkError())
            {
                if (b==1)
                {
                    out.write(d%80==0?'\n':'.');
                    d--;
                }
                else if (d>=b)
                {
                    out.write(buf);
                    d=d-b;
                }
                else
                {
                    out.write(buf,0,(int)d);
                    d=0;
                }
            }
            return;
        }


        
        
        // handle an exception
        String info= request.getPathInfo();
        if (info != null && info.endsWith("Exception"))
        {
            try
            {
                throw (Throwable) Thread.currentThread().getContextClassLoader().loadClass(info.substring(1)).newInstance();
            }
            catch (Throwable th)
            {
                throw new ServletException(th);
            }
        }


        // test a reset
        String reset= request.getParameter("reset");
        if (reset != null && reset.length() > 0)
        {
            response.getOutputStream().println("THIS SHOULD NOT BE SEEN!");
            response.setHeader("SHOULD_NOT","BE SEEN");
            response.reset();
        }
        
        
        // handle an redirect
        String redirect= request.getParameter("redirect");
        if (redirect != null && redirect.length() > 0)
        {
            response.getOutputStream().println("THIS SHOULD NOT BE SEEN!");
            response.sendRedirect(redirect);
            try
            {
                response.getOutputStream().println("THIS SHOULD NOT BE SEEN!");
            }
            catch(IOException e)
            {
                // ignored as stream is closed.
            }
            return;
        }


        // handle an error
        String error= request.getParameter("error");
        if (error != null && error.length() > 0 && request.getAttribute("javax.servlet.error.status_code")==null)
        {
            response.getOutputStream().println("THIS SHOULD NOT BE SEEN!");
            response.sendError(Integer.parseInt(error));
            try
            {
                response.getOutputStream().println("THIS SHOULD NOT BE SEEN!");
            }
            catch(IllegalStateException e)
            {
                try
                {
                    response.getWriter().println("NOR THIS!!"); 
                }
                catch(IOException e2){}
            }
            catch(IOException e){}
            return;
        }


        // Handle a extra headers 
        String headers= request.getParameter("headers");
        if (headers != null && headers.length() > 0)
        {
            long h=Long.parseLong(headers);
            for (int i=0;i<h;i++)
                response.addHeader("Header"+i,"Value"+i);
        }


        String buffer= request.getParameter("buffer");
        if (buffer != null && buffer.length() > 0)
            response.setBufferSize(Integer.parseInt(buffer));


        String charset= request.getParameter("charset");
        if (charset==null)
            charset="UTF-8";
        response.setCharacterEncoding(charset);
        response.setContentType("text/html");


        if (info != null && info.indexOf("Locale/") >= 0)
        {
            try
            {
                String locale_name= info.substring(info.indexOf("Locale/") + 7);
                Field f= java.util.Locale.class.getField(locale_name);
                response.setLocale((Locale)f.get(null));
            }
            catch (Exception e)
            {
                e.printStackTrace();
                response.setLocale(Locale.getDefault());
            }
        }


        String cn= request.getParameter("cookie");
        String cv=request.getParameter("cookiev");
        if (cn!=null && cv!=null)
        {
            Cookie cookie= new Cookie(cn, cv);
            if (request.getParameter("version")!=null)
                cookie.setVersion(Integer.parseInt(request.getParameter("version")));
            cookie.setComment("Cookie from dump servlet");
            response.addCookie(cookie);
        }


        String pi= request.getPathInfo();
        if (pi != null && pi.startsWith("/ex"))
        {
            OutputStream out= response.getOutputStream();
            out.write("</H1>This text should be reset</H1>".getBytes());
            if ("/ex0".equals(pi))
                throw new ServletException("test ex0", new Throwable());
            else if ("/ex1".equals(pi))
                throw new IOException("test ex1");
            else if ("/ex2".equals(pi))
                throw new UnavailableException("test ex2");
            else if (pi.startsWith("/ex3/"))
                throw new UnavailableException("test ex3",Integer.parseInt(pi.substring(5)));
            throw new RuntimeException("test<script>alert('no script?');</script>");
        }


        if ("true".equals(request.getParameter("close")))
            response.setHeader("Connection","close");


        String buffered= request.getParameter("buffered");
        
        PrintWriter pout=null;
        
        try
        {
            pout =response.getWriter();
        }
        catch(IllegalStateException e)
        {
            pout=new PrintWriter(new OutputStreamWriter(response.getOutputStream(),charset));
        }
        if (buffered!=null)
            pout = new PrintWriter(new BufferedWriter(pout,Integer.parseInt(buffered)));
        
        try
        {
            pout.write("<html>\n<body>\n");
            pout.write("<h1>Dump Servlet</h1>\n");
            pout.write("<table width=\"95%\">");
            pout.write("<tr>\n");
            pout.write("<th align=\"right\">getMethod:&nbsp;</th>");
            pout.write("<td>" + notag(request.getMethod())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getContentLength:&nbsp;</th>");
            pout.write("<td>"+Integer.toString(request.getContentLength())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getContentType:&nbsp;</th>");
            pout.write("<td>"+notag(request.getContentType())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getRequestURI:&nbsp;</th>");
            pout.write("<td>"+notag(request.getRequestURI())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getRequestURL:&nbsp;</th>");
            pout.write("<td>"+notag(request.getRequestURL().toString())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getContextPath:&nbsp;</th>");
            pout.write("<td>"+request.getContextPath()+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getServletPath:&nbsp;</th>");
            pout.write("<td>"+notag(request.getServletPath())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getPathInfo:&nbsp;</th>");
            pout.write("<td>"+notag(request.getPathInfo())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getPathTranslated:&nbsp;</th>");
            pout.write("<td>"+notag(request.getPathTranslated())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getQueryString:&nbsp;</th>");
            pout.write("<td>"+notag(request.getQueryString())+"</td>");


            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getProtocol:&nbsp;</th>");
            pout.write("<td>"+request.getProtocol()+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getScheme:&nbsp;</th>");
            pout.write("<td>"+request.getScheme()+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getServerName:&nbsp;</th>");
            pout.write("<td>"+notag(request.getServerName())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getServerPort:&nbsp;</th>");
            pout.write("<td>"+Integer.toString(request.getServerPort())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getLocalName:&nbsp;</th>");
            pout.write("<td>"+request.getLocalName()+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getLocalAddr:&nbsp;</th>");
            pout.write("<td>"+request.getLocalAddr()+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getLocalPort:&nbsp;</th>");
            pout.write("<td>"+Integer.toString(request.getLocalPort())+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getRemoteUser:&nbsp;</th>");
            pout.write("<td>"+request.getRemoteUser()+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getRemoteAddr:&nbsp;</th>");
            pout.write("<td>"+request.getRemoteAddr()+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getRemoteHost:&nbsp;</th>");
            pout.write("<td>"+request.getRemoteHost()+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getRemotePort:&nbsp;</th>");
            pout.write("<td>"+request.getRemotePort()+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getRequestedSessionId:&nbsp;</th>");
            pout.write("<td>"+request.getRequestedSessionId()+"</td>");
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">isSecure():&nbsp;</th>");
            pout.write("<td>"+request.isSecure()+"</td>");


            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">isUserInRole(admin):&nbsp;</th>");
            pout.write("<td>"+request.isUserInRole("admin")+"</td>");


            pout.write("</tr><tr>\n");
            pout.write("<th align=\"right\">getLocale:&nbsp;</th>");
            pout.write("<td>"+request.getLocale()+"</td>");
            
            Enumeration locales= request.getLocales();
            while (locales.hasMoreElements())
            {
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">getLocales:&nbsp;</th>");
                pout.write("<td>"+locales.nextElement()+"</td>");
            }
            pout.write("</tr><tr>\n");
            
            pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Other HTTP Headers:</big></th>");
            Enumeration h= request.getHeaderNames();
            String name;
            while (h.hasMoreElements())
            {
                name= (String)h.nextElement();


                Enumeration h2= request.getHeaders(name);
                while (h2.hasMoreElements())
                {
                    String hv= (String)h2.nextElement();
                    pout.write("</tr><tr>\n");
                    pout.write("<th align=\"right\">"+notag(name)+":&nbsp;</th>");
                    pout.write("<td>"+notag(hv)+"</td>");
                }
            }


            pout.write("</tr><tr>\n");
            pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Request Parameters:</big></th>");
            h= request.getParameterNames();
            while (h.hasMoreElements())
            {
                name= (String)h.nextElement();
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">"+notag(name)+":&nbsp;</th>");
                pout.write("<td>"+notag(request.getParameter(name))+"</td>");
                String[] values= request.getParameterValues(name);
                if (values == null)
                {
                    pout.write("</tr><tr>\n");
                    pout.write("<th align=\"right\">"+notag(name)+" Values:&nbsp;</th>");
                    pout.write("<td>"+"NULL!"+"</td>");
                }
                else if (values.length > 1)
                {
                    for (int i= 0; i < values.length; i++)
                    {
                        pout.write("</tr><tr>\n");
                        pout.write("<th align=\"right\">"+notag(name)+"["+i+"]:&nbsp;</th>");
                        pout.write("<td>"+notag(values[i])+"</td>");
                    }
                }
            }


            pout.write("</tr><tr>\n");
            pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Cookies:</big></th>");
            Cookie[] cookies = request.getCookies();
            for (int i=0; cookies!=null && i<cookies.length;i++)
            {
                Cookie cookie = cookies[i];


                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">"+notag(cookie.getName())+":&nbsp;</th>");
                pout.write("<td>"+notag(cookie.getValue())+"</td>");
            }
            
            String content_type=request.getContentType();
            if (content_type!=null &&
                !content_type.startsWith("application/x-www-form-urlencoded") &&
                !content_type.startsWith("multipart/form-data"))
            {
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"left\" valign=\"top\" colspan=\"2\"><big><br/>Content:</big></th>");
                pout.write("</tr><tr>\n");
                pout.write("<td><pre>");
                char[] content= new char[4096];
                int len;
                try{
                    Reader in=request.getReader();
                    
                    while((len=in.read(content))>=0)
                        pout.write(notag(new String(content,0,len)));
                }
                catch(IOException e)
                {
                    pout.write(e.toString());
                }
                
                pout.write("</pre></td>");
            }
            
            
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Request Attributes:</big></th>");
            Enumeration a= request.getAttributeNames();
            while (a.hasMoreElements())
            {
                name= (String)a.nextElement();
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\" valign=\"top\">"+name+":&nbsp;</th>");
                pout.write("<td>"+"<pre>" + toString(request.getAttribute(name)) + "</pre>"+"</td>");
            }            


            
            pout.write("</tr><tr>\n");
            pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Servlet InitParameters:</big></th>");
            a= getInitParameterNames();
            while (a.hasMoreElements())
            {
                name= (String)a.nextElement();
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">"+name+":&nbsp;</th>");
                pout.write("<td>"+ toString(getInitParameter(name)) +"</td>");
            }


            pout.write("</tr><tr>\n");
            pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Context InitParameters:</big></th>");
            a= getServletContext().getInitParameterNames();
            while (a.hasMoreElements())
            {
                name= (String)a.nextElement();
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">"+name+":&nbsp;</th>");
                pout.write("<td>"+ toString(getServletContext().getInitParameter(name)) + "</td>");
            }


            pout.write("</tr><tr>\n");
            pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Context Attributes:</big></th>");
            a= getServletContext().getAttributeNames();
            while (a.hasMoreElements())
            {
                name= (String)a.nextElement();
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\" valign=\"top\">"+name+":&nbsp;</th>");
                pout.write("<td>"+"<pre>" + toString(getServletContext().getAttribute(name)) + "</pre>"+"</td>");
            }




            String res= request.getParameter("resource");
            if (res != null && res.length() > 0)
            {
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"left\" colspan=\"2\"><big><br/>Get Resource: \""+res+"\"</big></th>");
                
                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">this.getClass().getResource(...):&nbsp;</th>");
                pout.write("<td>"+this.getClass().getResource(res)+"</td>");


                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">this.getClass().getClassLoader().getResource(...):&nbsp;</th>");
                pout.write("<td>"+this.getClass().getClassLoader().getResource(res)+"</td>");


                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">Thread.currentThread().getContextClassLoader().getResource(...):&nbsp;</th>");
                pout.write("<td>"+Thread.currentThread().getContextClassLoader().getResource(res)+"</td>");


                pout.write("</tr><tr>\n");
                pout.write("<th align=\"right\">getServletContext().getResource(...):&nbsp;</th>");
                try{pout.write("<td>"+getServletContext().getResource(res)+"</td>");}
                catch(Exception e) {pout.write("<td>"+"" +e+"</td>");}
            }
            
            pout.write("</tr></table>\n");


            /* ------------------------------------------------------------ */
            pout.write("<h2>Request Wrappers</h2>\n");
            ServletRequest rw=request;
            int w=0;
            while (rw !=null)
            {
                pout.write((w++)+": "+rw.getClass().getName()+"<br/>");
                if (rw instanceof HttpServletRequestWrapper)
                    rw=((HttpServletRequestWrapper)rw).getRequest();
                else if (rw  instanceof ServletRequestWrapper)
                    rw=((ServletRequestWrapper)rw).getRequest();
                else
                    rw=null;
            }
            
            pout.write("<br/>");
            pout.write("<h2>International Characters (UTF-8)</h2>");
            pout.write("LATIN LETTER SMALL CAPITAL AE<br/>\n");
            pout.write("Directly uni encoded(\\u1d01): \u1d01<br/>");
            pout.write("HTML reference (&amp;AElig;): &AElig;<br/>");
            pout.write("Decimal (&amp;#7425;): &#7425;<br/>");
            pout.write("Javascript unicode (\\u1d01) : <script language='javascript'>document.write(\"\u1d01\");</script><br/>");
            pout.write("<br/>");
            pout.write("<h2>Form to generate GET content</h2>");
            pout.write("<form method=\"GET\" action=\""+response.encodeURL(getURI(request))+"\">");
            pout.write("TextField: <input type=\"text\" name=\"TextField\" value=\"value\"/><br/>\n");
            pout.write("<input type=\"submit\" name=\"Action\" value=\"Submit\">");
            pout.write("</form>");


            pout.write("<br/>");
            
            pout.write("<h2>Form to generate POST content</h2>");
            pout.write("<form method=\"POST\" accept-charset=\"utf-8\" action=\""+response.encodeURL(getURI(request))+"\">");
            pout.write("TextField: <input type=\"text\" name=\"TextField\" value=\"value\"/><br/>\n");
            pout.write("Select: <select multiple name=\"Select\">\n");
            pout.write("<option>ValueA</option>");
            pout.write("<option>ValueB1,ValueB2</option>");
            pout.write("<option>ValueC</option>");
            pout.write("</select><br/>");
            pout.write("<input type=\"submit\" name=\"Action\" value=\"Submit\"><br/>");
            pout.write("</form>");
            pout.write("<br/>");
            
            pout.write("<h2>Form to generate UPLOAD content</h2>");
            pout.write("<form method=\"POST\" enctype=\"multipart/form-data\" accept-charset=\"utf-8\" action=\""+response.encodeURL(getURI(request))+"\">");
            pout.write("TextField: <input type=\"text\" name=\"TextField\" value=\"comment\"/><br/>\n");
            pout.write("File 1: <input type=\"file\" name=\"file1\" /><br/>\n");
            pout.write("File 2: <input type=\"file\" name=\"file2\" /><br/>\n");
            pout.write("<input type=\"submit\" name=\"Action\" value=\"Submit\"><br/>");
            pout.write("</form>");


            pout.write("<h2>Form to set Cookie</h2>");
            pout.write("<form method=\"POST\" action=\""+response.encodeURL(getURI(request))+"\">");
            pout.write("cookie: <input type=\"text\" name=\"cookie\" /><br/>\n");
            pout.write("value: <input type=\"text\" name=\"cookiev\" /><br/>\n");
            pout.write("<input type=\"submit\" name=\"Action\" value=\"setCookie\">");
            pout.write("</form>\n");
            
            pout.write("<h2>Form to get Resource</h2>");
            pout.write("<form method=\"POST\" action=\""+response.encodeURL(getURI(request))+"\">");
            pout.write("resource: <input type=\"text\" name=\"resource\" /><br/>\n");
            pout.write("<input type=\"submit\" name=\"Action\" value=\"getResource\">");
            pout.write("</form>\n");
            


        }
        catch (Exception e)
        {
            getServletContext().log("dump", e);
        }


        
        if (request.getParameter("stream")!=null)
        {
            pout.flush();
            Continuation continuation = ContinuationSupport.getContinuation(request, null);
            continuation.suspend(Long.parseLong(request.getParameter("stream")));
        }


        String lines= request.getParameter("lines");
        if (lines!=null)
        {

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      }
      queue.heartBeat();


      if (wait) {
        synchronized (queue.getActivationLock()) {
          final Continuation cont = ContinuationSupport.getContinuation(httpServletRequest, queue);


          if (!cont.isResumed() && !queue.messagesWaiting()) {
            queue.setActivationCallback(new JettyQueueActivationCallback(cont));
            if (cont.suspend(30 * 1000)) {
              return;
            }
          }
        }
      }

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      }




      if (wait) {
        synchronized (queue.getActivationLock()) {
          final Continuation cont = ContinuationSupport.getContinuation(httpServletRequest, queue);


          if (!cont.isResumed() && !queue.messagesWaiting()) {
            queue.setActivationCallback(new JettyQueueActivationCallback(cont));
            if (cont.suspend(30 * 1000)) {
              return;
            }
          }
        }
      }

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      }
      queue.heartBeat();


      if (wait) {
        synchronized (queue.getActivationLock()) {
          final Continuation cont = ContinuationSupport.getContinuation(httpServletRequest, queue);


          if (!cont.isResumed() && !queue.messagesWaiting()) {
            queue.setActivationCallback(new JettyQueueActivationCallback(cont));
            if (cont.suspend(30 * 1000)) {
              return;
            }
          }
        }
      }

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    }
    
    @Test
    public void testRetrieveFromContinuation() throws Exception {
        
        Continuation continuation = EasyMock.createMock(Continuation.class);
        
        Message m = new MessageImpl();
        ContinuationInfo ci = new ContinuationInfo(m);
        Object userObject = new Object();
        ci.setUserObject(userObject);
        continuation.getObject();
        EasyMock.expectLastCall().andReturn(ci);
        continuation.setObject(ci.getUserObject());
        EasyMock.expectLastCall();
        EasyMock.replay(continuation);
        
        HttpServletRequest httpRequest = EasyMock.createMock(HttpServletRequest.class);
        httpRequest.getAttribute("org.mortbay.jetty.ajax.Continuation");

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    }
    
    @Test
    public void testContinuationsIgnored() throws Exception {
        
        Continuation continuation = EasyMock.createMock(Continuation.class);
        HttpServletRequest httpRequest = EasyMock.createMock(HttpServletRequest.class);
        httpRequest.getAttribute("org.mortbay.jetty.ajax.Continuation");
        EasyMock.expectLastCall().andReturn(continuation);
        EasyMock.replay(httpRequest);

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                }


                setCurrentConnection(this);
                long io = 0;


                Continuation continuation = _request.getContinuation();
                if (continuation != null && continuation.isPending())
                {
                    Log.debug("resume continuation {}",continuation);
                    if (_request.getMethod() == null)
                        throw new IllegalStateException();
                    handleRequest();
                }
                else
                {
                    // If we are not ended then parse available
                    if (!_parser.isComplete())
                        io = _parser.parseAvailable();


                    // Do we have more generating to do?
                    // Loop here because some writes may take multiple steps and
                    // we need to flush them all before potentially blocking in
                    // the
                    // next loop.
                    while (_generator.isCommitted() && !_generator.isComplete())
                    {
                        long written = _generator.flush();
                        io += written;
                        if (written <= 0)
                            break;
                        if (_endp.isBufferingOutput())
                            _endp.flush();
                    }


                    // Flush buffers
                    if (_endp.isBufferingOutput())
                    {
                        _endp.flush();
                        if (!_endp.isBufferingOutput())
                            no_progress = 0;
                    }


                    if (io > 0)
                        no_progress = 0;
                    else if (no_progress++ >= 2)
                        return;
                }
            }
            catch (HttpException e)
            {
                if (Log.isDebugEnabled())
                {
                    Log.debug("uri=" + _uri);
                    Log.debug("fields=" + _requestFields);
                    Log.debug(e);
                }
                _generator.sendError(e.getStatus(),e.getReason(),null,true);


                _parser.reset(true);
                _endp.close();
                throw e;
            }
            finally
            {
                setCurrentConnection(null);


                more_in_buffer = _parser.isMoreInBuffer() || _endp.isBufferingInput();


                synchronized (this)
                {
                    _handling = false;


                    if (_destroy)
                    {
                        destroy();
                        return;
                    }
                }


                if (_parser.isComplete() && _generator.isComplete() && !_endp.isBufferingOutput())
                {
                    if (!_generator.isPersistent())
                    {
                        _parser.reset(true);
                        more_in_buffer = false;
                    }


                    reset(!more_in_buffer);
                    no_progress = 0;
                }


                Continuation continuation = _request.getContinuation();
                if (continuation != null && continuation.isPending())
                {
                    break;
                }
                else if (_generator.isCommitted() && !_generator.isComplete() && _endp instanceof SelectChannelEndPoint) // TODO
                                                                                                                         // remove

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        if (!engine.getContinuationsEnabled()) {
            return null;
        }
        
        Continuation cont = ContinuationSupport.getContinuation(req, null);
        synchronized (cont) {
            Object o = cont.getObject();
            if (o instanceof ContinuationInfo) {
                ContinuationInfo ci = (ContinuationInfo)o;
                m = (MessageImpl)ci.getMessage();
                
                // now that we got the message we don't need ContinuationInfo
                // as we don't know how continuation was suspended, by jetty wrapper
                // or directly in which (latter) case we need to ensure that an original user object
                // if any, need to be restored
                cont.setObject(ci.getUserObject());
            }
            if (m == null && (cont.isPending() || cont.isResumed())) {
                String message = "No message for existing continuation, status : "
                    + (cont.isPending() ? "Pending" : "Resumed");
                if (!(o instanceof ContinuationInfo)) {
                    message += ", ContinuationInfo object is unavailable";
                }
                LOG.warning(message);
            }

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