Re: Opening multiple database channels
Re: Opening multiple database channels
- Subject: Re: Opening multiple database channels
- From: Mike Schrag <email@hidden>
- Date: Thu, 22 Mar 2012 23:02:16 -0400
yeah, having multiple channels has to be locked by the store, because they are sharing a common set of snapshots ... you need multiple OSC's if you want multithreading. the only thing multiple channels is going to give you is headaches, it seems like.
ms
On Mar 22, 2012, at 10:53 PM, Chuck Hill wrote:
> OK, so... my first question has to be "what is your goal? What are you trying to accomplish?" This is NOT going to make EOF multi-threaded.
>
>
> Chuck
>
>
> On 2012-03-22, at 7:34 PM, Ramsey Gurley wrote:
>
>> Hi all,
>>
>> I'm looking at trying to open multiple database channels in a single instance of a WO app. No reason, just wondering if it can be done. I know there's ERXObjectStoreCoordinator pool, but this conceptually seems like the wrong way to do it. Maybe I want 4 open connections for one database, but only one on another… whatever. So I have a look at
>>
>> https://developer.apple.com/legacy/mac/library/documentation/WebObjects/Enterprise_Objects/Connecting/Connecting.html#//apple_ref/doc/uid/TP30001011-CH210-TPXREF145
>>
>> and this seems to be the answer to my question. Well, until I try it. It turns out that inside of objectsWithFetchSpec on EOEditingContext, the objectstore is locked before a fetch takes place. As a result, no other fetch can proceed until the object store is unlocked. The answer seemed suspicious in the fact that it's being done on the Session anyway...
>>
>> So, I guess my question boils down to… is it even possible? Is this the 'single EOF lock' that Chuck Hill and Ravi Mendis were referring to in a previous list message?
>>
>> Thanks,
>>
>> Ramsey
>>
>>
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