Object Oriented ABAP

BI_OBJECT~EXECUTE_DEFAULT_METHOD
BI_OBJECT~RELEASE
A class that implements the IF_WORKFLOW interface can be used in any workflow. The
class is automatically released for use in workflows when the interface is implemented.
Therefore, we can only make compatible changes to a class after implementation (we
cannot delete attributes, change types or delete methods). There is no where-used list to
show which workflows the class is used in.
Internal classes of an application should not implement the IF_WORKFLOW interface, since
this could mean that each method of the class is used in the workflow. Therefore, we should
encapsulate the workflow functions in another class that calls the selected methods of the
internal class.
Each method of the IF_WORKFLOW Interface as mentioned earlier has its distinct
functionality, which is discussed below.
16. BI_PERSISTENT~FIND_BY_LPOR Method:
If we want to convert a persistent saved display of an object into an instance of the
corresponding ABAP class, SAP Web flow Engine calls the BI_PERSISTENT~FIND_BY_LPOR
method.
Features:
The method parameter LPOR is the persistent object reference and is of SIBFLPOR structure
type. A reference of BI_PERSISTENT type is returned.
The following table shows the components of the SIBFLPOR structure:
Field Description
CATID Describes the object type ( CL for ABAP classes)
TYPEID ABAP class name
INSTID Object key. The key is limited to 32 characters.
We can implement this method in several ways. In the case of persistent classes we can
create the ABAP object instance using the generated classes. In the case of individual
persistence management we have to implement the individual actions (such as creating an
instance, performing an existence check, entering public attributes, and so on) manually
within the class.
Instance management takes place automatically in the case of persistent classes. In the
case of individual persistence management we also have to carry out instance management
by class. The SAP Web Flow Engine does not provide any instance management. We must
therefore implement our own instance management in the case of individual persistence
management.