How to chage defautl ADF PPR behaviour for a component?

Question

I have a heavy page with lot of text fields. On value change of any of this field I am sending a request to server side for calculation. On execution of this request, result is displayed to user. I am using PPR for this.
But my service execution is heavy and takes time. I need to allow user to change input when service is being executed on server side. However result should be displayed for the last request.
Is it possible to override the default implementation of ADF PPR? How to achieve it?
Is there any alternative to achieve this requirement?
I would appreciate any help!!

Answer 1

Hi John,
jsff File.
<?xml version='1.0' encoding='UTF-8'?>
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.1"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:af="http://xmlns.oracle.com/adf/faces/rich">
<af:subform id="mainFrm">
<!-- Input parameters: Begins -->
<af:panelBox id="pfinput" text="Input Parameters">
<af:outputText id="txtwait" value="Please wait..." inlineStyle="color:Red;" visible="false" clientComponent="true"
partialTriggers="txt1 txt2 txt3 txt4 msg"/>
<af:inputNumberSpinbox id="txt1" label="Text Field 1: " autoSubmit="true" binding="#{backingBeanScope.testBackingBean.txt1}" value="0"
valueChangeListener="#{backingBeanScope.testBackingBean.calculate}" clientComponent="true">
</af:inputNumberSpinbox>
<af:inputNumberSpinbox id="txt2" label="Text Field 2: " autoSubmit="true" binding="#{backingBeanScope.testBackingBean.txt2}" value="0"
valueChangeListener="#{backingBeanScope.testBackingBean.calculate}" clientComponent="true">
</af:inputNumberSpinbox>
<af:inputNumberSpinbox id="txt3" label="Text Field 3: " autoSubmit="true" binding="#{backingBeanScope.testBackingBean.txt3}" value="0"
valueChangeListener="#{backingBeanScope.testBackingBean.calculate}" clientComponent="true">
</af:inputNumberSpinbox>
<af:inputNumberSpinbox id="txt4" label="Text Field 4: " autoSubmit="true" binding="#{backingBeanScope.testBackingBean.txt4}" value="0"
valueChangeListener="#{backingBeanScope.testBackingBean.calculate}" clientComponent="true">
</af:inputNumberSpinbox>
</af:panelBox>
<!-- Input parameters: Ends -->
<!-- Result text -->
<af:panelBox id="pfoutput" text="Result">
<af:outputText id="msg" binding="#{backingBeanScope.testBackingBean.txtResult}"
partialTriggers="txt1 txt2 txt3 txt4" clientComponent="true"
inlineStyle="color:Red; font-family:Georgia, 'Times New Roman', times, Serif; font-size:medium; font-weight:bold;"/>
</af:panelBox>
</af:subform>
</jsp:root>
Backing bean method
public void calculate (ValueChangeEvent event) {
System.out.println ("Inside calculate method....");
try {
// External web service call which takes much time.
txtResult.setValue (executeService ());
} catch (InterruptedException e) {
e.printStackTrace();
Right now for each request result text is updated. I need to show only result of the last request.
While changing field values, end user should not be displyed result generated for each request sent based on valuechange listner set on each of the field.