Re: Object Store Coordinator and User Info – Is this Dangerous?
Re: Object Store Coordinator and User Info – Is this Dangerous?
- Subject: Re: Object Store Coordinator and User Info – Is this Dangerous?
- From: Chuck Hill <email@hidden>
- Date: Tue, 28 Oct 2008 19:26:57 -0700
On Oct 28, 2008, at 5:51 PM, Andrew Lindesay wrote:
Hello Chuck;
Define safe. ec.lock() does not lock the root object store, so
other ec's can also set / clear foobar while you are in this code.
Thanks; I take back what I said to Peter just then!
Safe... I guess I mean no bad concurrent things happening to the
OSC. I guess this is going to get a bit mucky. I guess the
following would work because the locks in the object stores are re-
entrant locks as far as I can remember...
Yes, that should be OK. It will block all other EOF operations that
need the OSC.
Chuck
ec.lock();
try
{
EOObjectStore ros = ec. rootObjectStore();
ros.lock();
try
{
ros.setUserInfoForKey(xyz,"foobar");
try
{
// do some editing context foo here!
}
finally
{ ec.rootObjectStore().setUserInfoForKey(null,"foobar"); }
}
finally { ros.unlock(); }
}
finally { ec.unlock(); }
cheers.
___
Andrew Lindesay
www.lindesay.co.nz
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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