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From "V.Narayanan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2763) In the Network Client InputStreams and Readers returned from LOB's should be sensitive to underlying LOB data changes.
Date Tue, 12 Jun 2007 12:32:27 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

V.Narayanan updated DERBY-2763:
-------------------------------

    Summary: In the Network Client InputStreams and Readers returned from LOB's should be
sensitive to underlying LOB data changes.  (was: In the Network Client InputStream returned
using Blob.getBinaryStream() should reflect the changes made to the underlying Blob.)

Since update sensitive LOB discussion has mostly happened on this issue
and proposals for the solution and sample implementations have been
generalized to LOB's I am changing this issue from Blob specific to dealing
with LOB streams in general. I will mark 2764 as duplicate.

> In the Network Client InputStreams and Readers returned from LOB's should be sensitive
to underlying LOB data changes.
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-2763
>                 URL: https://issues.apache.org/jira/browse/DERBY-2763
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Client
>    Affects Versions: 10.3.0.0
>            Reporter: V.Narayanan
>            Assignee: V.Narayanan
>             Fix For: 10.3.0.0
>
>         Attachments: Approach_2.diff, Approach_2.stat, Approach_2.txt, Approach_3.diff,
Approach_3.stat, Approach_4.diff, Approach_4.stat, LOBLengthPersists.java
>
>
> Currently the Embedded and Network Client would differ 
> in behaviour when the following series of steps is 
> followed.
> a) Create an empty Blob
> b) get an InputStream using Blob.getBinaryStream()
> c) write data into this Blob
>    c.1) Get an OutputStream
>    c.2) Use OutputStream.write(byte [] b) to write
>         into this Blob.
> d) Now read from the InputStream obtained in step b)
>    and print the number of bytes read as output.
> The output of step d) differs in the client and in the Embedded side.
> In the Client
> -------------
> The number of bytes read would always be -1.
> In the Embedded
> ---------------
> The number of bytes would be the number of bytes we
> reflected.
> The above behaviour in the NetworkClient is because
> the length of the Blob is read once and stored in the 
> constructor of the locator Stream returned (in the 
> attribute maxPos).
> This instead should be read each time we use the streams.
> A similar issue exists for Clobs also.
> I will raise a seperate JIRA issue for this.

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