Re: Yes, even one more concurrency question - relationship "freshness"
Re: Yes, even one more concurrency question - relationship "freshness"
- Subject: Re: Yes, even one more concurrency question - relationship "freshness"
- From: Miguel Arroz <email@hidden>
- Date: Tue, 14 Aug 2007 17:25:01 +0100
Hi!
On 2007/08/14, at 17:03, Chuck Hill wrote:
Hi Miguel,
You do have all the fun. Must be nice in Alentejo this time of
year...
Friday. Friday I go there. Right before the border with Spain,
Serpa is where I'll go. Good food. Sun. Pool. The bad news is... I
come back Sunday.
I can't see how EOF is finding this object. Can you post the start
of the stack trace when this happens?
Here it goes (tweaked some package names for trade-secret
purposes!). I used the debugger to peek inside all the EC variables,
and I found no reference to the object.
java.lang.IllegalStateException: Cannot obtain globalId for an object
which is not registered in any editingContext, object: {values =
{filterNumber = 1; status = "waiting"; survey = "null";
lastRepondentToProcess = "null"; issueDate = 2007-08-13 22:45:15 Etc/
GMT; }; this = "<com.DELETED.model.entity.FilterProcessingRequest
af8109 [Gid Not Found]>"; }, databaseContext:
com.webobjects.eoaccess.EODatabaseContext@81db25, object's
editingContext: null, databaseContext's active editingContext:
com.webobjects.eocontrol.EOEditingContext@356f42
at com.webobjects.eoaccess.EODatabaseContext._globalIDForObject
(EODatabaseContext.java:4847)
at
com.webobjects.eoaccess.EODatabaseContext.databaseOperationForObject
(EODatabaseContext.java:4964)
at com.webobjects.eoaccess.EODatabaseContext.recordUpdateForObject
(EODatabaseContext.java:6247)
at
com.webobjects.eoaccess.EODatabaseContext.nullifyAttributesInRelationshi
pSourceObjectDestinationObject(EODatabaseContext.java:5144)
at
com.webobjects.eoaccess.EODatabaseContext.nullifyAttributesInRelationshi
pSourceObjectDestinationObjects(EODatabaseContext.java:5165)
at
com.webobjects.eoaccess.EODatabaseContext.recordChangesInEditingContext(
EODatabaseContext.java:6133)
at
com.webobjects.eocontrol.EOObjectStoreCoordinator.saveChangesInEditingCo
ntext(EOObjectStoreCoordinator.java:412)
at com.webobjects.eocontrol.EOEditingContext.saveChanges
(EOEditingContext.java:3226)
at <my method>
...
I think there are a lot of applications our there with theoretical
problems. I am not sure that people find this to be a problem in
practice or, if they do, that they realize what happened. For many
of them concurrency is not a problem, users never edit objects that
other users can access. For may others, a "last in wins" approach
is just fine. It is definitely one of the unpolished areas of EOF.
I know that some problems that I'm fixing won't simply never
occur, and others may occur a few times in my app lifetime. But
still, it makes me nervous. I don't mind if a user in a thousand
users sees an error page in a thousand good pages. That doesn't
bother me. What bothers me is corrupting the data in the DB. When
dealing with tens of thousands of users, it's not something that you
can just go the backup and recover the erased file... the fact that
the data CANNOT be corrupted, period, scares me a little. That's why
I try to deal with all the possibilities.
Yours
Miguel Arroz
Miguel Arroz
http://www.terminalapp.net
http://www.ipragma.com
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| References: | |
| | >Yes, even one more concurrency question - relationship "freshness" (From: Miguel Arroz <email@hidden>) |
| | >Re: Yes, even one more concurrency question - relationship "freshness" (From: Chuck Hill <email@hidden>) |
| | >Re: Yes, even one more concurrency question - relationship "freshness" (From: Miguel Arroz <email@hidden>) |
| | >Re: Yes, even one more concurrency question - relationship "freshness" (From: Chuck Hill <email@hidden>) |
| | >Re: Yes, even one more concurrency question - relationship "freshness" (From: Miguel Arroz <email@hidden>) |
| | >Re: Yes, even one more concurrency question - relationship "freshness" (From: Chuck Hill <email@hidden>) |
| | >Re: Yes, even one more concurrency question - relationship "freshness" (From: Miguel Arroz <email@hidden>) |
| | >Re: Yes, even one more concurrency question - relationship "freshness" (From: Chuck Hill <email@hidden>) |
| | >Re: Yes, even one more concurrency question - relationship "freshness" (From: Miguel Arroz <email@hidden>) |
| | >Re: Yes, even one more concurrency question - relationship "freshness" (From: Chuck Hill <email@hidden>) |