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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3935) Introduce interface for a position aware stream
Date Fri, 21 Nov 2008 09:52:44 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3935?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kristian Waagan updated DERBY-3935:
-----------------------------------

    Attachment: derby-3935-1b-PositionedStream.diff

Regarding Resetable and PositionedStream (PS), the former is more tightly bound to store.
For instance, initStream handles locking, which is probably not required for data streams
outside of store. I don't see any immediate need to add the three methods resetStream, initStream
and closeStream to LOBInputStream.
I'm opting for committing what I have now, and look at combining the interfaces later if it
turns out that is the best thing to do.

I attached revision 1b, which adds two debug blocks (checking for a negative requested position),
removed the throws clause for EOFException and fixed some errors in the JavaDoc.
After rerunning the tests, I intend to commit patch 1b.

> Introduce interface for a position aware stream
> -----------------------------------------------
>
>                 Key: DERBY-3935
>                 URL: https://issues.apache.org/jira/browse/DERBY-3935
>             Project: Derby
>          Issue Type: Sub-task
>          Components: JDBC
>    Affects Versions: 10.5.0.0
>            Reporter: Kristian Waagan
>            Assignee: Kristian Waagan
>            Priority: Minor
>         Attachments: derby-3935-1a-PositionedStream.diff, derby-3935-1b-PositionedStream.diff
>
>
> Add an interface for streams that are aware of their position and that can reposition
itself on request.
> Initially there will be two such stream objects; PositionedStoreStream and LOBInputStream.
> The interface will be used to allow the Clob implementation (including UTF8Reader) to
handle the various internal Clob representations in a consistent manner when it comes to positioning
the underlying byte stream.

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