Optimistic Concurrency & Data Services

New and Notable 234

Sam Gentile's Blog — Wed, 03 Dec 2008 01:20:35 GMT

I am having a blast on my latest gig which has me using many different technologies at the same time from Ent Lib/SAB/WAB to WCF to Nunit to Oracle and so on. I love it. ALT.NET/DDD/TDD Greg has altdotnet seattle session video He also has his 9th is his

Astoria Design Walkthrough: Friendly Feeds Part 1

WF Channel9 Videos, Screencasts, and Podcasts — Sat, 27 Sep 2008 00:29:09 GMT

For V1 of ADO.NET Data Services (aka Project Astoria) we introduced a process we called Transparent Design

ADO.NET Data Services - Concurrency in Action

Mike Taulty's Blog — Fri, 30 May 2008 16:59:49 GMT

Just like for batching, there's a great explanation of how concurrency looks in ADO.NET Data Services...

ADO.NET Data Services Framework Beta 1 is Live!

Project Astoria Team Blog — Mon, 12 May 2008 19:21:03 GMT

We are very excited to announce that .NET 3.5 SP1 Beta 1 and Visual Studio 2008 SP1 Beta 1 are now available!

Astoria Data Services and Optimistic Concurrency

Hot Topics — Sat, 26 Apr 2008 18:51:20 GMT

Pablo Castro explains the new ETags attributes that will be available for ADO.NET Data Services classes

re: Optimistic Concurrency & Data Services

Steve — Fri, 25 Apr 2008 19:35:42 GMT

Is it possible to use data services with Silverlight2 beta 1 or future releases? and how easy is it to use with non microsoft ajax frameworks/javascript libraries, such as JQuery?

If so, can you supply some code/articles?

New and Notable 234

Sam Gentile — Fri, 25 Apr 2008 16:11:44 GMT

I am having a blast on my latest gig which has me using many different technologies at the same time

re: Optimistic Concurrency & Data Services

Pablo M. Castro — Fri, 25 Apr 2008 03:20:15 GMT

Hi Mark, thanks for the feedback. It's really interesting to hear this, as we struggled with it quite a bit.

I completely agree with you that weak ETags should be applicable anywhere. In fact, given that actual resources and their actual representation(s) are different constructs, I found it surprising that the ETag checks were based on bit-wise comparison and not on semantics alone.

I would be interesting to bring up this issue with the WG if there is enough momentum. I wrote to the AtomPub group because this seemed to be an application-level issue. That said, now that I know we're not alone I'd be happy to bring it up in other forums as well. Is the HTTPBIS WG mailing-list still active and a good place to send this?

-pablo

re: Optimistic Concurrency & Data Services

Mark Baker — Thu, 24 Apr 2008 21:14:11 GMT

Hey Pablo. FYI, the issue you describe wrt weak etags and PUT requests is not quite as clear cut as you make it out to be. There's been a bunch of discussion about similar issues in the HTTPBIS WG (which you guys should be participating in IMO!!).

Some people believe that weak etags should be able to be used on a PUT with If-None-Match. I think they could be used anywhere a strong etag could be used: the meaning of the message will change, that's all. e.g. PUT with If-Match with a weak etag means "set the state to that represented in the provided representation so long as the current state is semantically equivalent to the state identified by the etag I'm providing". With a strong etag, that meaning would change to "... so long as the current state is bit-wise equivalent to the state identified by the etag I'm providing".

While this has been discussed in the WG, it's on the periphery and may require its own issue. Do you want to handle that or will I?

REST and Concurrency Control

Pablo Castro's blog — Wed, 23 Apr 2008 04:17:55 GMT

As part of the Astoria design process we scanned through many topics, some of them are straightforward,