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

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

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

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)

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

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

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='2007-01-01' Composable, follow URI scheme

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

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

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

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

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

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

Resources Team blog: ADO.NET Data Services Forum http://blogs.msdn.com/astoriateam ADO.NET Data Services Forum http://forums.microsoft.com Data developer center: http://msdn.microsoft.com/data Email me: mike.flasko@microsoft.com

Related Content Data Services Chalk Talk WUX09-IS Creating hybrid application/platform web properties using REST services (Friday 9am @ Room 134) Entity Framework Sessions DAT 203 - Learning the Entity Framework DAT 307 – An In Depth Look at the Entity Framework

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