my app is reader2twitter, it receive notification from hub and send it to
twitter. However, recently, something strange happend. When the hub give me
a
notification, my app manipulate it twice and then send two updates to
twitter. I see it in the log. Can you explain me how this happened?

Here is some pseudocode:

hub notify my app a update

check the db to check whether my app receive the update before

if it is new send it to twitter and save to db

In the log, I see:

2010-02-18 22:10:19.069773 Found 1 entries
New
Sent done

 2010-02-18 22:10:19.113806
Found 1 entries
New
Sent done

But the update they find is just the same item...

-- 
Stay hungry,Stay foolish.

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