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Date: Sat, 9 Jun 2007 07:37:26 -0700 (PDT)
From: "V.Narayanan (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Updated: (DERBY-2763) In the Network Client InputStream
 returned using Blob.getBinaryStream() should reflect the changes made to
 the underlying Blob.
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     [ https://issues.apache.org/jira/browse/DERBY-2763?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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

    Attachment: Approach_2.txt
                Approach_2.stat
                Approach_2.diff

This patch address this issue using Approach 2 namely

Streams sees the changes that have been made to the part of the Lob
that has not yet been read. 

I have attached a .txt file that explains the changes in detail

I ran BlobClob4BlobTest on this patch and saw no failues.

The patch still needs more tests to test for the case of the underlying
LOB being invalidated.

> In the Network Client InputStream returned using Blob.getBinaryStream() should reflect the changes made to the underlying Blob.
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 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, 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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