2. Building and Consuming REST-based Data Services for the Web
Session Code: WUX313
Building and Consuming REST-based Data Services for the Web
Mike Flasko
Program Manager
Microsoft

3. Agenda Why data services Characteristics of a data service
Creating and consuming services
Summary: A data platform for the web

4. Silverlight Applications
Why Data Services?
HTML + Javascript
Data (XML, etc)
DLL + XAML
Data (XML, etc)
Data (XML, etc)
Mashup UI
Data Feeds
AJAX Applications
Silverlight Applications
Online Services
Mashups

5. Exploring Data Services
Clients
(Tools, Libraries, etc)
HTTP (AtomPub)
ADO.NET Data Services Framework
SQL Data Services
SQL Server
(Cloud data service)
(On premises data service)

6. A REST Interface for Data
Entity Data Model
URIs
Every resource is addressable via a URI
Flexible URI scheme for data retrieval
HTTP
Data as resources, HTTP verbs to manipulate it
Leverage caching, proxies, authentication, …
Formats
AtomPub, JSON
The underlying model
Entities and associations  resources and links

7. Creating Data Services
HTTP
Create services directly from Visual Studio
Various data sources
Entity Framework
LINQ providers
Model-driven
Structural description in Entity Data Model
Schema shapes the service contract
Hosting/HTTP Listener
Data Services Runtime
IQueryable [+ IUpdatable]
Data Access Layer
Entity Framework
Custom LINQ provider
Relational database
Other sources

8. Refining and Securing Services
Visibility
Per-container visibility control
Read, Query and Write options
Authentication
Integrate with hosting environment
ASP.NET, WCF or custom authentication schemes
Interceptors
Execute before HTTP GET/PUT/POST/DELETE
Enable validation, custom row-level security policies
Maintain the REST interface
Service Operations
Custom entry points, e.g. /MyTags?startDate=' '
Composable, follow URI scheme

9. Additional Service Considerations….
Optimistic Concurrency
Integrates with EF notion of concurrency tokens per type
Uses existing HTTP semantics (ETags)
Batching
Create responsive, operation intensive applications
Enables “all or nothing” groups of CUD operations
Versioning
Simple versioning scheme
Error Handling & Contracts
Map exceptions in service-tier to platform independent, HTTP-friendly responses
Debug mode to control verbosity of error information on the wire

10. Consuming Data Services
An HTTP stack is enough
AtomPub clients
.NET Framework & Silverlight 2
LINQ to ADO.NET Data Services Framework
AJAX (CodePlex)
ASP.NET Data Source Control

11. Summary Data Service Clients Tools HTTP (AtomPub, …) Domain Specific
(Visual Studio, …)
Data Service Clients
(Any HTTP client, .NET, SL, ASP.NET,
ASP.NET AJAX, …)
HTTP (AtomPub, …)
Windows Azure Tables
ADO.NET Data Services Framework
(on premise or hosted)
SQL Data Services
Domain Specific
Building Block

12. Roadmap
ADO.NET Data Services Framework shipped as part of .NET FX 3.5 SP1
Updated AJAX client for data services released just before PDC08
Windows Azure Tables & SQL Data Services CTPs announced at PDC 08
Working on the design of data services V2 features now – let us know what you think!
“Astoria Offline” Alpha Preview by EOY

13. What do you think? Transparent Design Process
Design notes posted to the team blog as we go (
Jump on a post early and its more likely your comments will shape the product
Watch team members describe features in an uncomfortable setting

14. Q & A FRIDAY - DAY 5 12:45 - 13:15 Meet me in the
Ask-the-Experts pavilion!
FRIDAY - DAY 5 12: :15

15. Resources Team blog: ADO.NET Data Services Forum
ADO.NET Data Services Forum
Data developer center:
me:

16. Related Content Data Services Chalk Talk
WUX09-IS Creating hybrid application/platform web
properties using REST services (Friday Room 134)
Entity Framework Sessions
DAT Learning the Entity Framework
DAT 307 – An In Depth Look at the Entity Framework

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20. © 2008 Microsoft Corporation. All rights reserved
© 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.