Reverse Ajax Problem

Hi All,

 

I have Portlet application which is deployed in Liferay 4.3.5 and using Reverse Ajax functionality but my server side class doesn’t invoke the javascript function to display the data.

Following are the things that I have done to enable Reverse Ajax

 

In web.xml

           

<servlet>

     <servlet-name>dwr-invoker</servlet-name>

      <display-name>DWR Servlet</display-name>

      <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>

               

      <init-param>

                 <param-name>debug</param-name>

                 <param-value>true</param-value>

      </init-param>

    <init-param>

            <param-name>activeReverseAjaxEnabled</param-name>

            <param-value>true</param-value>

     </init-param>           

    <load-on-startup>2</load-on-startup>                

</servlet>  

 

In dwr.xml

 

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.org/dwr/dwr20.dtd">

 

<dwr>

  <allow>

     <convert converter="bean" match="utils..ClientServiceFormBean"/>

  

     <create creator="new" javascript="Service" scope="application">

         <param name="class" value="utils.Service"/>

    </create>

  </allow>

 </dwr>

 

We are using tiles for the GUI and have mainlayout.jsp which has reference to header.jsp,footer.jsp,menu.jsp and in the body part the respective jsp page changes.

I have added in jsp page the following thing

window.onload=dwr.engine.setActiveReverseAjax(true);

 

The call is going to my server side class utils.Service.java but the data it pushes is not getting displayed.

 

I have also downloaded the src code of dwr and kept SOP statements and have seen the data is flushed to the browser but it is not displaying data.

 

Please let me know the solution to the problem.

 

Thanks,

Pavan T | Software Engineer | Persistent Systems Limited
pavan_t@... | Tel: +91 (20) 3023 4150
Innovation in software product design, development and delivery -  www.persistentsys.com

 

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Hi,

 

Thanks for your reply

 

Following is the server side code

 

public class Service{

 

            private static List<ClientServiceFormBean> servicesDetails=null;

            private static int previous=0;

            private static int next=0;

            private static int initial=0;

 

 

            public static List<ClientServiceFormBean> getServicesDetails() {

                        return servicesDetails;

            }

 

            public static void setServicesDetails(

                                    List<ClientServiceFormBean> servicesDetails) {

                        Service.servicesDetails = servicesDetails;

            }

 

            public void getServices() throws InterruptedException{

 

                        System.out.println("inside get services");

 

                        ResourceBundle resource=ResourceBundle.getBundle("provgui_menu_items");

                        String displayRecords=resource.getString("totalRecords");

                        initial=Integer.parseInt(displayRecords);

                        next=initial-1;

                        previous=next;

                        next+=initial;

 

 

                         WebContext wctx = WebContextFactory.get();

                         String currentPage = wctx.getCurrentPage();

                         Collection sessions = wctx.getScriptSessionsByPage(currentPage);

                         Util utilAll = new Util(sessions);

 

            List<ClientServiceFormBean> services=new ArrayList<ClientServiceFormBean>();

                        int size=servicesDetails.size();

                        System.out.println("size of servicesDetails : "+size);

            for(int i=0;i<(size/initial)-1;i++){

                        System.out.println("previous: "+previous+" Next : "+next+" i: "+i);

                        List<ClientServiceFormBean> records=new ArrayList<ClientServiceFormBean>();

                        Thread.sleep(4000);

                        for(;previous<next;previous++){

                                    records.add(servicesDetails.get(previous));

                        }

                        previous=next;

                        next+=initial;

                        System.out.println("sending records....."+records.size());

 

                        utilAll.addFunctionCall("fillTable",records);

 

             }

 

}

}

 

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This *seems* ok depending on how it is invoked... the use of static fields scares me a bit. What is the size() of sessions?

   Collection sessions = wctx.getScriptSessionsByPage(currentPage);

2009/11/6 Pavan T <pavan_t@...>

Hi,

 

Thanks for your reply

 

Following is the server side code

 

public class Service{

 

            private static List<ClientServiceFormBean> servicesDetails=null;

            private static int previous=0;

            private static int next=0;

            private static int initial=0;

 

 

            public static List<ClientServiceFormBean> getServicesDetails() {

                        return servicesDetails;

            }

 

            public static void setServicesDetails(

                                    List<ClientServiceFormBean> servicesDetails) {

                        Service.servicesDetails = servicesDetails;

            }

 

            public void getServices() throws InterruptedException{

 

                        System.out.println("inside get services");

 

                        ResourceBundle resource=ResourceBundle.getBundle("provgui_menu_items");

                        String displayRecords=resource.getString("totalRecords");

                        initial=Integer.parseInt(displayRecords);

                        next=initial-1;

                        previous=next;

                        next+=initial;

 

 

                         WebContext wctx = WebContextFactory.get();

                         String currentPage = wctx.getCurrentPage();

                         Collection sessions = wctx.getScriptSessionsByPage(currentPage);

                         Util utilAll = new Util(sessions);

 

            List<ClientServiceFormBean> services=new ArrayList<ClientServiceFormBean>();

                        int size=servicesDetails.size();

                        System.out.println("size of servicesDetails : "+size);

            for(int i=0;i<(size/initial)-1;i++){

                        System.out.println("previous: "+previous+" Next : "+next+" i: "+i);

                        List<ClientServiceFormBean> records=new ArrayList<ClientServiceFormBean>();

                        Thread.sleep(4000);

                        for(;previous<next;previous++){

                                    records.add(servicesDetails.get(previous));

                        }

                        previous=next;

                        next+=initial;

                        System.out.println("sending records....."+records.size());

 

                        utilAll.addFunctionCall("fillTable",records);

 

             }

 

}

}

 

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Also, in later versions of DWR it is preferred to use the following for scalability:

 

import org.directwebremoting.ScriptSessions;

import org.directwebremoting.Browser;

 

final Object[] args = ...;

Browser.withCurrentPage(new Runnable() {

   public void run() {

      ScriptSessions.addFunctionCall("someFunction", args);

   }

});

 

Cheers,

Lance.

2009/11/6 Lance Java <lance.java@...>

This *seems* ok depending on how it is invoked... the use of static fields scares me a bit. What is the size() of sessions?

   Collection sessions = wctx.getScriptSessionsByPage(currentPage);

2009/11/6 Pavan T <pavan_t@...>

Hi,

 

Thanks for your reply

 

Following is the server side code

 

public class Service{

 

            private static List<ClientServiceFormBean> servicesDetails=null;

            private static int previous=0;

            private static int next=0;

            private static int initial=0;

 

 

            public static List<ClientServiceFormBean> getServicesDetails() {

                        return servicesDetails;

            }

 

            public static void setServicesDetails(

                                    List<ClientServiceFormBean> servicesDetails) {

                        Service.servicesDetails = servicesDetails;

            }

 

            public void getServices() throws InterruptedException{

 

                        System.out.println("inside get services");

 

                        ResourceBundle resource=ResourceBundle.getBundle("provgui_menu_items");

                        String displayRecords=resource.getString("totalRecords");

                        initial=Integer.parseInt(displayRecords);

                        next=initial-1;

                        previous=next;

                        next+=initial;

 

 

                         WebContext wctx = WebContextFactory.get();

                         String currentPage = wctx.getCurrentPage();

                         Collection sessions = wctx.getScriptSessionsByPage(currentPage);

                         Util utilAll = new Util(sessions);

 

            List<ClientServiceFormBean> services=new ArrayList<ClientServiceFormBean>();

                        int size=servicesDetails.size();

                        System.out.println("size of servicesDetails : "+size);

            for(int i=0;i<(size/initial)-1;i++){

                        System.out.println("previous: "+previous+" Next : "+next+" i: "+i);

                        List<ClientServiceFormBean> records=new ArrayList<ClientServiceFormBean>();

                        Thread.sleep(4000);

                        for(;previous<next;previous++){

                                    records.add(servicesDetails.get(previous));

                        }

                        previous=next;

                        next+=initial;

                        System.out.println("sending records....."+records.size());

 

                        utilAll.addFunctionCall("fillTable",records);

 

             }

 

}

}

 

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The class posted by Paven is certainly not thread safe. 

On Fri, Nov 6, 2009 at 3:29 AM, Lance Java <lance.java@...> wrote:

Also, in later versions of DWR it is preferred to use the following for scalability:

 

import org.directwebremoting.ScriptSessions;

import org.directwebremoting.Browser;

 

final Object[] args = ...;

Browser.withCurrentPage(new Runnable() {

   public void run() {

      ScriptSessions.addFunctionCall("someFunction", args);

   }

});

 

Cheers,

Lance.

2009/11/6 Lance Java <lance.java@...>

This *seems* ok depending on how it is invoked... the use of static fields scares me a bit. What is the size() of sessions?

   Collection sessions = wctx.getScriptSessionsByPage(currentPage);

2009/11/6 Pavan T <pavan_t@...>

Hi,

 

Thanks for your reply

 

Following is the server side code

 

public class Service{

 

            private static List<ClientServiceFormBean> servicesDetails=null;

            private static int previous=0;

            private static int next=0;

            private static int initial=0;

 

 

            public static List<ClientServiceFormBean> getServicesDetails() {

                        return servicesDetails;

            }

 

            public static void setServicesDetails(

                                    List<ClientServiceFormBean> servicesDetails) {

                        Service.servicesDetails = servicesDetails;

            }

 

            public void getServices() throws InterruptedException{

 

                        System.out.println("inside get services");

 

                        ResourceBundle resource=ResourceBundle.getBundle("provgui_menu_items");

                        String displayRecords=resource.getString("totalRecords");

                        initial=Integer.parseInt(displayRecords);

                        next=initial-1;

                        previous=next;

                        next+=initial;

 

 

                         WebContext wctx = WebContextFactory.get();

                         String currentPage = wctx.getCurrentPage();

                         Collection sessions = wctx.getScriptSessionsByPage(currentPage);

                         Util utilAll = new Util(sessions);

 

            List<ClientServiceFormBean> services=new ArrayList<ClientServiceFormBean>();

                        int size=servicesDetails.size();

                        System.out.println("size of servicesDetails : "+size);

            for(int i=0;i<(size/initial)-1;i++){

                        System.out.println("previous: "+previous+" Next : "+next+" i: "+i);

                        List<ClientServiceFormBean> records=new ArrayList<ClientServiceFormBean>();

                        Thread.sleep(4000);

                        for(;previous<next;previous++){

                                    records.add(servicesDetails.get(previous));

                        }

                        previous=next;

                        next+=initial;

                        System.out.println("sending records....."+records.size());

 

                        utilAll.addFunctionCall("fillTable",records);

 

             }

 

}

}

 

DISCLAIMER ========== This e-mail may contain privileged and confidential information which is the property of Persistent Systems Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Ltd. does not accept any liability for virus infected mails.

Hi,

 

The problem with statics is thread safe but why it is not invoking the javascript function and not displaying the data.

Please let me know.

 

Thanks,

Pavan T | Software Engineer | Persistent Systems Limited
pavan_t@... | Tel: +91 (20) 3023 4150
Innovation in software product design, development and delivery -  www.persistentsys.com

---

From: Pavan T
Sent: Friday, November 06, 2009 11:12 AM
To: 'users@...'
Subject: RE: [dwr-user] Reverse ajax problem

 

Hi,

 

Thanks for your reply

 

Following is the server side code

 

public class Service{

 

            private static List<ClientServiceFormBean> servicesDetails=null;

            private static int previous=0;

            private static int next=0;

            private static int initial=0;

 

 

            public static List<ClientServiceFormBean> getServicesDetails() {

                        return servicesDetails;

            }

 

            public static void setServicesDetails(

                                    List<ClientServiceFormBean> servicesDetails) {

                        Service.servicesDetails = servicesDetails;

            }

 

            public void getServices() throws InterruptedException{

 

                        System.out.println("inside get services");

 

                        ResourceBundle resource=ResourceBundle.getBundle("provgui_menu_items");

                        String displayRecords=resource.getString("totalRecords");

                        initial=Integer.parseInt(displayRecords);

                        next=initial-1;

                        previous=next;

                        next+=initial;

 

 

                         WebContext wctx = WebContextFactory.get();

                         String currentPage = wctx.getCurrentPage();

                         Collection sessions = wctx.getScriptSessionsByPage(currentPage);

                         Util utilAll = new Util(sessions);

 

            List<ClientServiceFormBean> services=new ArrayList<ClientServiceFormBean>();

                        int size=servicesDetails.size();

                        System.out.println("size of servicesDetails : "+size);

            for(int i=0;i<(size/initial)-1;i++){

                        System.out.println("previous: "+previous+" Next : "+next+" i: "+i);

                        List<ClientServiceFormBean> records=new ArrayList<ClientServiceFormBean>();

                        Thread.sleep(4000);

                        for(;previous<next;previous++){

                                    records.add(servicesDetails.get(previous));

                        }

                        previous=next;

                        next+=initial;

                        System.out.println("sending records....."+records.size());

 

                        utilAll.addFunctionCall("fillTable",records);

 

             }

 

}

}

 

DISCLAIMER ========== This e-mail may contain privileged and confidential information which is the property of Persistent Systems Ltd. It is intended only for the use of the individual or entity to which it is addressed. If you are not the intended recipient, you are not authorized to read, retain, copy, print, distribute or use this message. If you have received this communication in error, please notify the sender and delete all copies of this message. Persistent Systems Ltd. does not accept any liability for virus infected mails.

Hi,

 

I have also some more problems. I will explain clearly the scenario that we are trying to achieve. In GUI when we select the drop down box and click on button it will fetch and display the data. The number of records that are displayed are very large and browser is talking much time to display all the records and we have decided to display 200 records at a time using ‘Reverse Ajax’. So the server pushes every 200 records.

We are using Liferay Portal 4.3.5 and using using strutsPortlet application. Intially the code is there in action class of Portlet

 

public class HaulAction extends CommonAction{

 

 

    /** Log4j logging. */

  private static Log logger = LogFactory.getLog(SwitchBackhaulAction.class);

 

 

 public HaulAction() {

 }

 

 

     public ActionForward render(ActionMapping mapping, ActionForm form, PortletConfig config,RenderRequest request, RenderResponse response)

                 throws Exception{

 

     {

 

     logger.info("Render Action :" +IConstant.ENTERED);

     String actionName=null;

     String selectedTab=request.getParameter("selectedTab");

     logger.info("Selected Tab :" + selectedTab);

     String forward = "normalSwitchBackhaul";

     //String forward=IConstant.FORWARD_SUCCESS;

     SwitchBackhaulForm switchBackhaulForm=(SwitchBackhaulForm)form;

 

     try{

     request.setAttribute("selectedTab",forward);

     String circuitName=(String)request.getParameter("hiddenLabel");

     System.out.println("circuitName :"+circuitName);

         logger.info("Label in Render Action :" +circuitName);

             SwitchBackhaulHelper helper=new SwitchBackhaulHelper();

     actionName=request.getParameter("Button");

     String reset=request.getParameter("reset");

     String userId=PortletUtil.getUsername(request);

     System.out.println("userId : "+userId);

     PortletSession session=request.getPortletSession();

     boolean forceEnabled;

      if(session.getAttribute("forceEnable",session.APPLICATION_SCOPE)==null){

         forceEnabled=false;

     }else{

         forceEnabled=((Boolean)session.getAttribute("forceEnable",session.APPLICATION_SCOPE)).booleanValue();

     }

      /* Added for Display All Checkbox change */

      //get the role of the Logged in User

      Collection roles=(Collection)session.getAttribute("roles",session.APPLICATION_SCOPE);

      //chk if the logged in user is Super user or not

      if(null != roles && roles.contains("PROVGUISUPER")){

      //set the user as an Super User in the form

      switchBackhaulForm.setIsSuperUser("true");

      logger.debug(" SwitchBackhaulAction : Role of Logged in User is Super User");

      }else{

      //set the user as not an Super User in the Form

      switchBackhaulForm.setIsSuperUser("false");

      logger.debug(" SwitchBackhaulAction : Role of Logged in User is not Super User");

      }

 

      /* End of Addition */

 

      List<CustomerInfo> customerList=null;

     //populate customer list

   if(reset!=null && reset.equals("true"))

   {

        customerList=helper.getCustomers(userId);

        Collections.sort(customerList);

        switchBackhaulForm.setCustomerNames(customerList);

        logger.info(" got customers  " + customerList.size());

        switchBackhaulForm.setClientServiceList(null);

        //make a call to helper to get the Filter inputs

        helper.getFilterInputs(userId,switchBackhaulForm);

        forward="customerSuccess";

   }

 

 

     logger.info("Clicked on Action :" + actionName);

 

     ArrayList<ServiceInfo> filterServices=null;

 

     if(actionName==null)

     {

     logger.info("cleaning session ");

         cleanSession(request);

     }

     while(actionName!=null){

         if(actionName.equals("Fetch")){

                 logger.info("Fetch Circuits Action :" + IConstant.ENTERED);

                 /* Added Change By Sukanta dey for SVC Layer*/

                 helper.getCircuits(switchBackhaulForm,userId);

                 /* Change End */

                 List ipProfiles=helper.getAllIpProfiles(userId);

                 logger.info("Fetch Circuits Action :" + IConstant.EXITED);

 

             break;

          }

 

 

                 if(actionName.equals("Get Services")){

                  String forceEnabledCheckbox=request.getParameter("forceEnabledCheckbox");

                  System.out.println("forceEnabledCheckbox : "+forceEnabledCheckbox);

                  if(forceEnabledCheckbox!=null){

                     forceEnabled=Boolean.parseBoolean(forceEnabledCheckbox);

                     session.setAttribute("forceEnable",forceEnabled,PortletSession.APPLICATION_SCOPE);

                  }

                  logger.info("Get Services Action :" + IConstant.ENTERED);

                 boolean showDisconnectCheckbox=switchBackhaulForm.getShowDisconnectCheckbox();

                 String [] selectedFrom=request.getParameterValues("selectedFromCircuit");

                 System.out.println("selectedFrom : ");

                 for(int i=0;i<selectedFrom.length;i++){

                 System.out.print(selectedFrom[i]+",");

                 }

                 if(showDisconnectCheckbox){

                  if(selectedFrom != null && selectedFrom.length > 1){

                     logger.info("***Checkbox value is True***" + selectedFrom[0]);

                     switchBackhaulForm.setSelectedFromCircuit(selectedFrom[0]);

                 }

                 }

                 else{

                 if(selectedFrom != null && selectedFrom.length > 1){

                     logger.info("***Checkbox value is False***" + selectedFrom[1]);

                     switchBackhaulForm.setSelectedFromCircuit(selectedFrom[1]);

                 }

                 }

                 selectedFrom=null;

                 /* Added for Display all checkbox change */

                 //get the status of the displayAll checkbox

                 boolean displayAllCheckbox=switchBackhaulForm.isDisplayAllCheckbox();

                 //collect the values of checkboxes

                 String [] selectedTo=request.getParameterValues("selectedToCircuit");

                 System.out.println("selectedTo : ");

                 for(int i=0;i<selectedTo.length;i++){

                 System.out.print(selectedTo[i]+",");

                 }                   

                 //chk the vallue of checkbox

                 if(displayAllCheckbox){

                 if(null != selectedTo && selectedTo.length > 1){

                     logger.info("*** Display All Checkbox value is True ***" + selectedTo[0]);

                     //if checkbx is checked get the circuit from total circuits

                     switchBackhaulForm.setSelectedToCircuit(selectedTo[0]);

                 }

                 }

                 else{

                        if(null != selectedTo && selectedTo.length > 1){

                     logger.info("*** Display All Checkbox value is False ***" + selectedTo[1]);

                     //if checkbx is not checked get the circuit from matching circuits

                     switchBackhaulForm.setSelectedToCircuit(selectedTo[1]);

                 }

                 }

                 //make the string array null

                 selectedTo=null;

 

                 /* End of Addition */

             String circuitId=switchBackhaulForm.getSelectedFromCircuit();

             logger.info(

...

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