ADF BC and the Active Data Service

Question

hi
The OFM Fusion Developer's Guide for Oracle ADF 11g Release 1 (B31974-05) has a section "42 Using the Active Data Service"
at http://download.oracle.com/docs/cd/E15523_01/web.1111/b31974/adv_ads.htm
that says "... If you want your components to update based on events passed into ADF Business Components, then you need to use the Active Data Proxy. ..."
but it does not seem to explain how to use ADF BC and the Active Data Service.
I have been able to create this example application ...
http://www.consideringred.com/files/oracle/2010/ActiveDataServiceADFBCApp-v0.01.zip
... that does not have a af:poll component (but has moved polling into a managed bean).
  <managed-bean>
    <managed-bean-name>sumSalBean</managed-bean-name>
    <managed-bean-class>activedataserviceadfbcapp.view.SumSalBean</managed-bean-class>
    <managed-bean-scope>session</managed-bean-scope>
    <managed-property>
      <property-name>empSumSalVO</property-name>
      <value>#{data.activedataserviceadfbcapp_view_sumSalPagePageDef.SumSal.viewObject}</value>
    </managed-property>
  </managed-bean>This is some code in the SumSalBean class:
package activedataserviceadfbcapp.view;
// also based on code found in "ADF’s Active Data Service and scalar data (like activeOutputText)" by Matthias Wessendorf
// at http://matthiaswessendorf.wordpress.com/2010/01/07/adf%E2%80%99s-active-data-service-and-scalar-data-like-activeoutputtext/
public class SumSalBean
     extends BaseActiveDataModel
     protected static final String SUM_SAL_NAME = "sumSal";
     protected final AtomicInteger fCurrentChangeCount = new AtomicInteger(0);
     protected long fActiveDataUpdateEventTime;
     protected EmpSumSalVO fEmpSumSalVO = null;
     @PostConstruct
     public void setupActiveData()
          ActiveModelContext vActiveModelContext =
               ActiveModelContext.getActiveModelContext();
          Object[] vKeyPath = new String[0];
          vActiveModelContext.addActiveModelInfo(this, vKeyPath, SUM_SAL_NAME);
          ScheduledExecutorService vSEService = Executors.newScheduledThreadPool(1);
          vSEService.scheduleAtFixedRate(new Runnable()
                    public void run()
                         if (hasDataChanged())
                              triggerActiveDataUpdateEvent();
               3, // let's wait some seconds
               2, // period between the updates
               TimeUnit.SECONDS);
     public void triggerActiveDataUpdateEvent()
          setActiveDataUpdateEventTime(System.currentTimeMillis());
          incrementCurrentChangeCount();
          ActiveDataUpdateEvent vEvent =
               ActiveDataEventUtil.buildActiveDataUpdateEvent(
                    ActiveDataEntry.ChangeType.UPDATE,
                    getCurrentChangeCount(), new String[0], null,
                    new String[] { SUM_SAL_NAME },
                    new Object[] { getSumSal() });
          fireActiveDataUpdate(vEvent);
     public String getSumSal()
          EmpSumSalVO vEmpSumSalVO = getEmpSumSalVO();
          return "" + vEmpSumSalVO.getFirstSumSal();
     protected void startActiveData(Collection<Object> rowKeys,
          int startChangeCount)
     protected void stopActiveData(Collection<Object> rowKeys)
     public int getCurrentChangeCount()
          return fCurrentChangeCount.get();
     protected boolean hasDataChanged()
          EmpSumSalVO vEmpSumSalVO = getEmpSumSalVO();
          return vEmpSumSalVO.hasDataChanged(getActiveDataUpdateEventTime());
     public void setEmpSumSalVO(EmpSumSalVO pEmpSumSalVO)
          fEmpSumSalVO = pEmpSumSalVO;
}How all this behaves a runtime can be seen in this screencast
at http://www.screentoaster.com/watch/stUEpQSkxIR19aSV9YW1NRVF9W/activedataserviceadfbcapp_v0_01_zip_demo
I would welcome comments on how the example application in ActiveDataServiceADFBCApp-v0.01.zip can be improved, or references to information on how this should be done properly.
question
(q1) Where can I find some example code that does use ADF BC and the Active Data Service?
many thanks
Jan Vervecken

Answer 1

Jan,
ADF BC does not natively support ADF yet. Its planned for a next release. The only Data Control that out of the box support ADS is BAM. To use ADF BC with e.g. databae change notifications you
- create a shared AM
- Configure the VO to respond to database changes (check box)
- Configure the database to broadcast changes
- Use an af:poll component for the refresh because the update would be on the model layer only
So what is in the documentation is a doc bug. In the current releae you can use ADS best with a POJO model (that you use directly for dashboard use cases). You can though use a POJO data control, but this at the current stage would just act as a pass through for the data access.
See example 156 on http://blogs.oracle.com/smuenchadf/examples/ for how to do it with ADF BC
Frank
Ps.: Of course, the plan is to make everything working out of the box with no developer action required.
Edited by: Frank Nimphius on Feb 12, 2010 6:56 AM
Re-read your post. Maybe I need to revise my comment. Are you accessing AM directly or via the ADF layer. If the latter - I did not yet look at your sample - then this may work if you don't release the AM module you access directly (may not scale well)