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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3970) PositionedStoreStream doesn't initialize itself properly
Date Tue, 02 Dec 2008 22:10:44 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kristian Waagan updated DERBY-3970:
-----------------------------------

    Attachment: derby-3970-1a-PositionedStoreStream_init.diff.txt

Patch 1a performs the initialization in the constructor and adjusts the calling code.
It also removed the resetting of the position variable in initStream, as only the first call
will actually ensure the position of the underlying stream is set to zero. Subsequent calls
are no-ops.

Patch ready for review.

> PositionedStoreStream doesn't initialize itself properly
> --------------------------------------------------------
>
>                 Key: DERBY-3970
>                 URL: https://issues.apache.org/jira/browse/DERBY-3970
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 10.3.3.0, 10.4.2.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>            Priority: Minor
>         Attachments: derby-3970-1a-PositionedStoreStream_init.diff.txt
>
>
> When a PositionedStoreStream is created on top of a stream from store, it must properly
initialize itself.
> Proper initialization consists of initializing and resetting the stream to make sure
the states of the streams are in sync.
> A case of out of sync stream states was detected in a test where the Clob reference wasn't
kept, but a new Clob object was created for each operation, i.e:
>   rs.getClob(1).length();
>   rs.getClob(1).getSubString(...);
> A symptom of out of sync stream states is EOFException on a valid request.
> I don't think the access style above is supposed to work, but the proper initialization
should be performed anyway.

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