Using Caché Objects - InterSystems Documentation

%OnNew
20.8 %OnNew
This instance method is called by the %New method at the point when all the storage for an
object has been allocated and properties with initial values have had their values set. This
method allows you to pass initialization information to a new instance, such as the location
where an object resides on disk or a unique identifier.
Its syntax is:
ReturnValue %OnNew(InitialValue As %CacheString)
where:
ReturnValue
InitialValue
A %Status code, where an error stops the creation of the object.
A string that the method uses in setting up the object.
This method is available to the %Library.RegisteredObject class and its subclasses.
20.9 %OnOpen
This instance method is called by the %Open method just before an object is opened. It
allows you to verify the state of an instance compared to any relevant entities; for instance,
you can use the method also to ensure the function of an object's real-world analog.
Its syntax is:
ReturnValue %OnOpen()
where:
ReturnValue
A %Status code, where an error stops the opening of the object.
This method is available to the %Library.Persistent class and its subclasses.
Using Caché Objects 175