Accessing Windows Live Services via AtomPub Pablo Castro Software Architect Microsoft Corporation
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Accessing Windows Live Services via AtomPubPablo CastroSoftware ArchitectMicrosoft Corporation
Agenda
Service InterfacesAtom & AtomPubAtom-Enabled Data ServicesDrill Down: Windows Live Spaces PhotosData Services FrameworkWrap-up
Service Interfaces
Operation-centric vs data-centric interface style depending on the nature of the service
Data Centric
• Spaces Photos, …• Application-Based Storage• SQL Data Services• …
Operations Centric
• Messenger• Live ID• Alerts• …
Existing interfaces work well
New Atom interfaces
Data Services & AtomPub
AtomPub
Unified Development Story
Visual Studio
.NET and Silverlight
2
ASP.NET Integration
AJAX library
3rd party component
s
Consumer Services
e.g.:• Windows Live Spaces (Photos)
Infrastructure Services
e.g.:• Application- Based Storage• SQL Server Data Services
On-Premises Services
e.g.:• Data Services framework against local SQL Server
The Atom Syndication Format
IETF RFC 4287
XML format
Organized in feeds, entries and links
Extensible data and metadata
<feed xmlns="…/Atom">
<id>…/Folders</id> <title>Folders</title> <updated>…</updated> <author> <name>John Doe</name> </author>
<entry> <id>…/Folders(123)</id> <title>Cool Pics</title> <updated>…</updated> <link rel="self" … /> <link rel="related" … /> <content type="app/xml"> < … content … > </content> </entry>
</feed>
The Atom Publishing Protocol
IETF RFC 5023
Protocol for publishing and editing resources
Atom representations over HTTP
Simple RESTful interaction model
DE
LETE
PU
T
PO
ST
GE
T
Server w/ AtomPub interface
Photos is part of Windows Live Spaces
New experimental AtomPub interfacehttps://cumulus.services.live.com/{id}/
AtomSpacesPhotos
Authorization via LiveIDMore information at http://dev.live.com/liveidCheck out the delegated authentication SDK
Browse and create folders and photosFolders/Photos as Atom feeds and entriesPhotos are Atom “media link entries”
Drill Down: Photos
URL Conventions
AtomPub does not specify URL formatWe follow a predictable, uniform pattern
Description Example URL
Top-level container /Folders
Address single entry by ID /Folders(123)
Traverse a link /Folders(123)/Photos
Addressing can nest as appropriate
/Folders(123)/Photos(456)/ImageStreams
Access primary value /Folders(123)/Photos(456)/$value
Presentation control ** $orderby, $filter, $top, $skip, $expand
Service metadata /$metadata
Accessing AtomPub Services
Any HTTP stack
• Minimal barrier of entry, retain full control• Manually deal with content and interaction
AtomPub libraries
• .NET: WCF Syndication• Many available for other environments
ADO.NET Data Services Framework
• Services that follow the ‘Astoria’ conventions• First-class support in client-stack
ADO.NET Data Services Framework
aka “Project Astoria”
Rich framework for data servicesConsume existing servicesExpose your own data as a serviceModel-driven, uses the Entity Data Model
Follows the same patterns as Live services
Same HTTP AtomPub-based interface
Clients for Data Services
ADO.NET Data Services tools apply across all data services
.NET & Silverlight librariesObject-based API, LINQ query supportASP.NET integration
AJAX libraryTools driven by Entity Data model
3rd party control vendors for even richer toolbox
AD
O.N
ET D
ata
S
erv
ices
Fram
ew
ork
Your Own Data Services
ADO.NET Data Services Framework
Data-centric servicesAtomPub interface‘Astoria’ conventionsVarious data sourcesOnline or on-premises
Data Access LayerEntity
Framework
Custom LINQ
provider
Relational database Other
sources
Service Runtime
Hosting/HTTP listener
HTTP
IQueryable [+ IUpdatable]
Summary
Service alignment We’re aligning our services on AtomPubFirst experimental interfaces available
Windows Live Spaces PhotosApplication-Based Storage (experimental service)SQL Server Data Services (soon)
Your own services can follow the same interface
Rich developer storyUnified conventions for URLs and data modelGrowing tools/components ecosystem
Try this out and give us feedback!
Related Talks at Mix 2008
SessionsRESTful Data Services with the ADO.NET Data Services FrameworkDeveloping with Windows LiveIntroducing SQL Server Data ServicesUsing the Microsoft Sync Framework and FeedSyncBuilding RESTful Real World Applications with the ADO.NET Data Services Framework
Also check out the hands-on labs!
Resources
Windows Live APIshttp://dev.live.com
ADO.NET Data Services Frameworkhttp://astoria.mslivelabs.comhttp://blogs.msdn.com/astoriateam
AtomPubhttp://atomenabled.org
Contact mehttp://blogs.msdn.com/[email protected]
© 2008 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after
the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.
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