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Re: Opening multiple database channels
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Re: Opening multiple database channels


  • Subject: Re: Opening multiple database channels
  • From: "Cheong Hee (Gmail)" <email@hidden>
  • Date: Fri, 23 Mar 2012 12:28:34 +0800

Hi Ramsey

To get a new database channel, you can initiate a new OSC and get a new access layer stack. This has to be done at session constructor, for after which, you will not be able to get the new database channel. Putting aside the argument whether it is necessary or good design or not, it works. If I could remember, this is also mentioned in the WO legacy documentation.

Cheers

Cheong Hee

----- Original Message ----- From: "Ramsey Gurley" <email@hidden>
To: "WebObjects Development" <email@hidden>
Sent: Friday, March 23, 2012 10:34 AM
Subject: Opening multiple database channels


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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References: 
 >Opening multiple database channels (From: Ramsey Gurley <email@hidden>)

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