4 Replies Latest reply on Oct 26, 2007 8:50 AM by balteo

    Working example of a4j:push [Please help Ilya]

    balteo
    balteo Oct 26, 2007 5:03 AM

      Hello,

      I am trying to construct a working example of a4j:push that I might post on the wiki/cookbook and here what I came up with:

      The javabean (REQUEST SCOPE)

      package pack;

import java.util.Date;
import java.util.EventListener;
import java.util.EventObject;
import org.ajax4jsf.event.PushEventListener;


/**
 *
 * @author Administrator
 */
public class TheBean {

 /** Creates a new instance of TheBean */
 public TheBean() {

 }
 private Date date;
 private PushEventListener listener = new MyPushEventListener();

 public void addListener(EventListener listener) {
 synchronized (listener) {
 if (this.listener != listener) {
 this.listener = (PushEventListener) listener;
 }
 }
 }

 public Date getDate() {
 return new Date();
 }

 public void push() {
 synchronized (this.listener) {
 this.listener.onEvent(new EventObject(this));
 }
 }

}
class MyPushEventListener implements PushEventListener {

 public void onEvent(EventObject evt) {
 System.out.println(evt.getSource());
 //DO SOME ACTION IN HERE
 }



}


      and the fist jsp: receiver 

       <f:view>
 <a4j:status startText="in progress" stopText="done"/>

 <a4j:form>
 <a4j:push reRender="msg" eventProducer="#{theBean.addListener}" interval="100"/>
 <a4j:outputPanel id="msg" ajaxRendered="true">
 <h:outputText value="#{theBean.date}">
 <f:convertDateTime type="time"/>
 </h:outputText>
 </a4j:outputPanel>
 <a4j:log level="ALL" popup="true" hotkey="L"/>
 </a4j:form>
 </f:view>


      The receiver 
       <f:view>
 <a4j:status startText="in progress" stopText="done"/>

 <h:form>
 <a4j:region>
 <a4j:commandButton value="Push!!" action="#{theBean.push}"/>
 <a4j:log level="ALL" popup="true" hotkey="L"/>
 </a4j:region>
 </h:form>
 </f:view>


      My msg is not updated...

      Can anyone help,

      Julien.

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        • 1. Re: Working example of a4j:push [Please help Ilya]
          fmarwede Oct 26, 2007 6:03 AM (in response to balteo)

          I can't help but I'm (and many others in this forum, too, I think) very interested in that.

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          • 2. fmarwede
            balteo
            balteo Oct 26, 2007 8:26 AM (in response to balteo)

            Hello fmarwede,

            I am glad you too are interested in a4j:push.

            Have you tried a4j:push personally or do you have code you could share?

            I will definitely post info if and when I get information on my side.

            Julien.

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            • 3. Re: Working example of a4j:push [Please help Ilya]
              ilya_shaikovsky
              ilya_shaikovsky Oct 26, 2007 8:30 AM (in response to balteo)

              using just your code for bean and next page

              <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
 xmlns:a4j="https://ajax4jsf.dev.java.net/ajax"
 xmlns:f="http://java.sun.com/jsf/core"
 xmlns:h="http://java.sun.com/jsf/html"
 xmlns:rich="http://richfaces.ajax4jsf.org/rich"
 xmlns:ui="http://java.sun.com/jsf/facelets">
 <ui:composition template="/templates/common.xhtml">
 <ui:define name="body">
 <a4j:status startText="in progress" stopText="done"/>

 <a4j:form>
 <a4j:push reRender="msg" eventProducer="#{pushBean.addListener}" interval="100"/>
 <a4j:outputPanel id="msg" >
 <h:outputText value="#{pushBean.date}">
 <f:convertDateTime type="time"/>
 </h:outputText>
 </a4j:outputPanel>
 <a4j:commandButton value="Push!!" action="#{pushBean.push}" ajaxSingle="true"/>
 <a4j:log popup="false"/>
 </a4j:form>
 </ui:define>
 </ui:composition>
</html>


              I'm able to see that push working. Checked with enabled setted to false - button doesn't change anything and setting to true - time updated after button clicked.

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              • 4. Re: Working example of a4j:push [Please help Ilya]
                balteo
                balteo Oct 26, 2007 8:50 AM (in response to balteo)

                Thanks a lot for you reply Ilya.
                I forgot to mention that the two JSP fragments go into separate JSP pages. I reworked the example and came up with something more complex and that make sense but that does not work.

                from faces-config.xml

                <managed-bean>
 <managed-bean-name>theBean</managed-bean-name>
 <managed-bean-class>pack.TheBean</managed-bean-class>
 <managed-bean-scope>request</managed-bean-scope>
 </managed-bean>
 <managed-bean>
 <managed-bean-name>myApplicationBean</managed-bean-name>
 <managed-bean-class>pack.MyApplicationBean</managed-bean-class>
 <managed-bean-scope>application</managed-bean-scope>
 </managed-bean>


                TheBean.java 

                package pack;

import java.util.Date;
import java.util.EventListener;
import java.util.EventObject;
import javax.faces.context.FacesContext;


/**
 *
 * @author Administrator
 */
public class TheBean {

 private Date date;
 private MyPushEventListener listener;

 public TheBean() {
 MyApplicationBean app_bean = (MyApplicationBean) FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().get("myApplicationBean");
 this.listener = app_bean.getListener();
 }

 public void addListener(EventListener listener) {
 synchronized (listener) {
 if (this.listener != listener) {
 MyApplicationBean app_bean = (MyApplicationBean) FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().get("myApplicationBean");
 this.listener = app_bean.getListener();
 }
 }
 }

 public Date getDate() {
 return new Date();
 }

 public void push() {
 synchronized (this.listener) {
 MyApplicationBean app_bean = (MyApplicationBean) FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().get("myApplicationBean");
 this.listener = app_bean.getListener();
 this.listener.onEvent(new EventObject(this));
 }
 }
}


                the application-scoped bean: 

                package pack;

/**
 *
 * @author jumartin
 */

public class MyApplicationBean {

 private MyPushEventListener listener;

 public MyApplicationBean() {
 listener = new MyPushEventListener();
 }

 public MyPushEventListener getListener() {
 return listener;
 }



}


                in a jsp page invoked before other pages 
                 <%
 application.setAttribute("myApplicationBean", new pack.MyApplicationBean());
 %>


                the push event listener 
                package pack;

import java.util.EventObject;
import org.ajax4jsf.event.PushEventListener;

public class MyPushEventListener implements PushEventListener {

 public void onEvent(EventObject evt) {
 System.out.println(evt.getSource());
 System.out.println(this);
 //DO SOME ACTION IN HERE
 }

}


                the TWO jsps (fragments) 
                receiver.jsp
<a4j:form>
 <rich:message for="date" passedLabel="ok" ajaxRendered="true" showDetail="true"/>

 <a4j:push reRender="date" immediate="true" eventProducer="#{theBean.addListener}" interval="100"/>
 <a4j:outputPanel id="date" ajaxRendered="true">
 <h:outputText value="#{theBean.date}">
 <f:convertDateTime type="time"/>
 </h:outputText>
 </a4j:outputPanel>
 <a4j:log level="ALL" popup="false" hotkey="L"/>
 </a4j:form>


**************
Pusher.jsp
<f:view>
 <a4j:status startText="in progress" stopText="done"/>

 <h:form>
 <a4j:region>
 <a4j:commandButton value="Push!!" action="#{theBean.push}" ajaxSingle="true"/>
 <a4j:log level="ALL" popup="false" hotkey="L"/>
 </a4j:region>
 </h:form>
 </f:view>


                I have spent a good part of the afternoon working on this and I am still not able to make it work.

                Any clue? I changed to ajaxSingle=true

                Julien.

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