Re: [COAS-List] Proposed ObservationData IDL

[David Forslund <dwf@lanl.gov>]

Just two comments for people to note:

This change results in no ObservationData object when the IDL is mapped to 
the language since it is an Any.

Second, I thought the submitters were concerned about the performance of 
Any which is why they only used it
for the ObservationValue so that all navigation could be done with the 
struct.  With this proposal, everything is coming across the wire as an Any.

These are just issues to think about.

Dave
At 12:30 AM 8/30/99 -0700, Tim Brinson wrote:
>COAS Submitters and Supporters,
>
>Here is the proposed IDL changes for ObservationData.  I have not tried
>to compile it yet so there may be some typos.  You will have to comment
>out the old struct for ObservationData and put the following in.  You
>will have to move ObservationQualifier, TimeStamp and TimeSpan up before
>they are used.
>
>I kept the number of ObservationData types to a minimum (3) for COAS
>1.0.  They still give the biggest bang for the buck and don't require
>clients to expect very many types that could come back.  The first two
>are just generic Composite and Atomic types.  The SimpleObservationData
>may be a commonly used type.  There may be others that are more usefull
>but this could get the discussion going.
>
>As you will see I did not need to change the Information Model - just
>the IDL mapping.  The various structures are not bound statically into
>the operations which gives flexibility for the service to adapt to
>changes in the type definition.
>
>Regards,
>
>Tim
>
>
>         typedef any ObservationData;
>         // This is the type bound to the operations.
>         // COAS 1.0 ObservationData can only be one of the 3 structs
>defined below.
>
>
>         struct CompositeObservationData {
>                 QualifiedCodeStr code;
>                 sequence<ObservationData> composite;
>                 sequence<ObservationQualifier> qualifiers;
>         };
>
>         struct AtomicObservationData {
>                 QualifiedCodeStr code;
>                 any value;
>                 sequence<ObservationQualifier> qualifiers;
>         };
>
>         struct SimpleObservationData {
>                 QualifiedCodeStr code;
>                 any value;
>                 ObservedSubjectId observed_subject;
>                 TimeSpan time_span;
>         };
>