Dalesio, Leo `Bob` wrote:
Return id, quality, data_type, number_of_elements, access
access - do I have access or not
How are we providing access rights information over DA?
o Other than with V3 one CA subscription can cover a property catalog
containing stuff with different access rights. To be exact, every single
property must have an access rights sub-property connected to it.
o The property catalog that is used for accessing the data won't carry
that information - it should only export readable properties to aViewer
and only writeable properties to a Manipulator. (Else it would be
throwing exeptions all the time.)
o So the probably most natural place for that info is the special
descriptive property catalog that is used to find out about the data
property catalog structure and native types of its properties. This
thing should contain /all/ properties regardless of access rights and
carry the access right info with every property.
o Will there be a separate callback for access rights change? (The
current V4 CA client interface doc says: no.)
o So: Clients that want to be notified if access rights change, have to
subscribe to ... what exactly? A pseudo property that exists for every
property in the catalog? The special desription property catalog? (If
this contains the access rights data as mentioned above, it will be
updated if access rights change.) Sounds feasible. The description
property catalog could (should?) be held internally in the CA client
library to spare the client tool from implementing storage for this
structure information. Storage would be provided by the Data Store
facility. (Alternatively, the client tool could organise storing the
structure info itself - probably also by using the Data Store facility.
o Will the access security configuration (as it is organised
hierarchically) be available or even modifyable through DA?
ps. Please use the mailing list that Andrew announced
(<email@example.com>) instead of multiple To:-Headers, so that
everyone gets the mail and it is archived on the web.
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