Oren Eini

aka Ayende Rahien

Oren Eini

CEO of RavenDB

a NoSQL Open Source Document Database

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oren@ravendb.net

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RavenDB Workshops - Deep dive into practical use of Document Data Modeling

Apr 24 2006

Concurrency Questions

time to read 1 min | 168 words

I was asked a question today, and I'm not sure what the answer is. The issue is with optimistic concurrency on the web. I got an edit page that allows a user to edit a page. I want to throw a concurrency exception if a second user has changed the object while the first user was editing it.

The issue is that when I get the values of the form back when the user is finished editing, I no longer know what version of the object the user has edited. It looks like I would need to store the version of the object (most likely a SQL Server Row Version) in the form as well, and then get the object from NHibernate, set the version property of the object (and all the rest of the fields), and then try to save, to see if there was a concurrency violation.

Any other ideas that I have not thought of?

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RECENT COMMENTS

Dmitry, Yes, but this is _known_ to be a 64 bits system - since we are allocating 3GB (not possible in 64 bits). Note t...

By Oren Eini on Answer: What does this code do?
That's why it is a good idea to compare the return value of `write` to the buffer size. "size_t" can be 32-bit on some system...

By Dmitry on Answer: What does this code do?
There's a reason we miss `write_exact` and `read_exact` from the standard library. In fact, I am surprised the chunk is actua...

By Pyth0n on Challenge: What does this code do?
kpvleeuwen, I agree, unfortunately I don't have anyone to ask off the top of my head. Thanks, I fixed the headers.

By Oren Eini on Performance discovery: IOPS vs. IOPS
It could be interesting to reach out to storage firmware developers and ask what write patterns they think would be useful ex...

By kpvleeuwen on Performance discovery: IOPS vs. IOPS

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