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Date: Tue, 5 Jun 2007 06:48:26 -0700 (PDT)
From: "Kristian Waagan (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-2646) Cleanup of Clob control/support
 structures
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    [ https://issues.apache.org/jira/browse/DERBY-2646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12501559 ] 

Kristian Waagan commented on DERBY-2646:
----------------------------------------

I was planning to use it to ensure visibility of the variable without having to obtain a lock. This it achieves, but since release() is closing the store stream as well, I need to obtain a lock to ensure the stream is not closed while an operation is being performed on it. Thus the volatile modifier must go away (I will fix this at once).

And the reason why you don't understand much of the synchronization policy, is because it is not yet in place :)
The task grew a bit bigger than expected, and I need to push it out to "get things done". It is also bad to track all these things under this issue.
I have created DERBY-2762 to track the synchronization issue. There are also some related issues already filed, and I hope we can link them up soon.

Even though there are important things not yet addressed regarded to Clob, all our tests passes...
As a little warning, we might see some instabilities related to Clobs. There are two reasons; this rewrite on the embedded side, and the enabling of locator support on the client side. I think we should get these improvements into trunk ASAP and then address the remaining issues.

> Cleanup of Clob control/support structures
> ------------------------------------------
>
>                 Key: DERBY-2646
>                 URL: https://issues.apache.org/jira/browse/DERBY-2646
>             Project: Derby
>          Issue Type: Sub-task
>          Components: JDBC
>    Affects Versions: 10.3.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>             Fix For: 10.3.0.0
>
>         Attachments: derby-2646-01a_trailing_space.diff, derby-2646-01a_trailing_space.stat, derby-2646-02a-clob-reorg.diff, derby-2646-02a-clob-reorg.stat, derby-2646-03a-internalclob.diff, derby-2646-04a-storestreamclob_utf8util.diff, derby-2646-04a-storestreamclob_utf8util.stat, derby-2646-04b-storestreamclob_utf8util.diff, derby-2646-05a-tests.diff, derby-2646-05a-tests.stat, derby-2646-05b-tests.diff
>
>


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