All,
I've posted this feedback in slide form at:
ftp://ftp.pwg.org/pub/pwg/cloud/white/cloud-extension-comments-sweet-20121203.pdf
This feedback is based on my work on IPPSIX, the IPP binding spec for this stuff...
.....
GetAvailableJobs
- Don’t like being able to get jobs for multiple Printers
- Doesn’t match existing SM or IPP Printer objects - the Client
is always talking to a single service endpoint/target, not
multiple services/targets
- Existing model does not preclude having a Cloud Print Manager
that fronts multiple output devices
- 1 Cloud Print Manager with multiple output devices
sharing the same Cloud Print Service, or
- N Cloud Print Managers (implementation might merge
these) each using their own Cloud Print Service
- But why have GetAvailableJobs at all?
- Existing GetJobs operation provides all the info needed
- Notifications tell you which printer needs to be polled
FetchDocument
- Need basic transform functionality
- Request that the document data be transformed to a
suitable format for printing, such as “I need PWG
Raster data in 8-bit grayscale at 300dpi”
- This is used by Google Cloud Print and other
implementations
- Also covers things such as copy generation, scaling,
number-up, etc.
- Cloud Print Service advertises capabilities
(FetchDocumentElementsSupported,
FetchDocumentPWGRasterDocumentTypesSupported,
FetchDocumentPWGRasterDocumentResolutionsSupported)
- Cloud Print Manager includes DocumentTicket in FetchDocument
request
- Includes additional elements for output format
(DocumentFormat/Details, PWGRasterDocumentType,
PWGRasterDocumentResolution)
- Cloud Print Service will need to fetch data from
Document URI
- Do we define when that happens?
- What about caching?
User Role “Printer”
- When characterizing access control policies, we often use
“adminstrator”, “operator”, “user”, and “system” as user
roles
- For Cloud Print we need a new role for the printer/ Cloud
Print Manager
- Printers can fetch documents, users probably can’t
(although there is a use case for users viewing
documents they have submitted...)
- Most of the other Cloud Print operations are probably
printer-only
__________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair
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