Skip to main content

Forcefully Executing a View Accessor

To execute view accessor 'brutally' whenever frameworks refers view accessor row set, add the following in your parent view object implementation class.

  protected ViewRowSetImpl createViewLinkAccessorRS(AssociationDefImpl   
  assocDef, ViewObjectImpl accessorVO, Row masterRow, Object[] values){  
   if ("<viewlink accessor attribute name>".equals(assocDef.getName())) {  
   return super.createViewLinkAccessorRS(assocDef, accessorVO, masterRow,  

Learn More ...

There are a lot more points like this. If  you are curious to learn the internals of the ADF Business Components and ADF Binding Layer,  the following book is for you - Oracle ADF Real World Developer’s Guide.
More details about this book can be found in this post-


florinmarcus said…
This brings up another topic, related with caching on both view or entity level: What is the life span of the cache: per ADF session, per http request, or per transaction?

Oracle doesn't make this clear on documentation, might be because they see it as implementation detail, not for developer concern. Still, it would be helpful to have an understanding of caching.

Jobinesh said…
I'll blog on it sometime next week
Nick said…
Hi Jobinesh,

what are some of the use cases that you might find this brute force execution of a View Accessor useful?
Jobinesh said…
One use case is tree search - When you expand a parent node, application fails to refresh child nodes.
Interestingly, the above case may work sometimes in a non predicable way. Reason is WeakReference of the QueryCollection used for child rowset are garbage collected periodically(when GC runs) and that cause framework to requery child rowset. The code snippet in the blog post ensures child rowset refreshes whenever framework asks for it.
Nick said…
Thanks Jobinesh. Always very informative. :)

Popular posts from this blog

Happy New Year 2018 !

We can't go back and change the beginning, but we always can start where we are and change the ending. Believe in yourself and you will be unstoppable!

Wishing you and your family a very happy new year 2018 !!!

How to set Bind Variable Values at runtime ?

In this post I'm sharing a couple of approaches for programmatically setting bind variables values at run time. This post is an attempt to explain 'When to use what ?'[ In case if you are familiar with 'Bind Variables' in ADF BC, please refer Section 5.10, Working with Bind Variables in Fusion Developer's Guide ]

1. Set the Bind Variable value using RowSet::setNamedWhereClauseParam(...)

You can use use the setNamedWhereClauseParam(...) method on the ViewObject interface (which extends oracle.jbo.RowSet) to set the value for bind variables. Please note this sets the value on default RowSet. In other words, this doesn't have any effect on the secondary RowSets that you/system generates.
ViewObject vo = am.findViewObject("EmployeesView1"); vo.setNamedWhereClauseParam("bindVarDeptId", new Number(10)); vo.executeQuery();
2. Set the Bind Variable value using ViewObject's VariableValueManager::setVariableValue(...)

VariableValueManager Ma…