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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3781) PositionedStoreStream.reposition(pos) with pos greater than length leaves the stream object in an inconsistent state
Date Tue, 15 Jul 2008 11:55:31 GMT
PositionedStoreStream.reposition(pos) with pos greater than length leaves the stream object
in an inconsistent state
--------------------------------------------------------------------------------------------------------------------

                 Key: DERBY-3781
                 URL: https://issues.apache.org/jira/browse/DERBY-3781
             Project: Derby
          Issue Type: Bug
          Components: Store
    Affects Versions: 10.4.1.3, 10.3.3.0, 10.5.0.0
            Reporter: Kristian Waagan
            Assignee: Kristian Waagan
            Priority: Minor


PositionedStoreStream.reposition(pos) with pos greater than the stream length leaves the stream
object in an inconsistent state, causing subsequent calls to fail or the state to remain inconsistent
(which can cause the wrong data to be returned).

The problem is that the position variable gets out of sync with the underlying stream.
There are at least two ways to fix this (assuming the positioned store stream does not know
the length of the underlying stream):
 a) Reset stream to position zero.
 b) Let the stream be positioned at EOF and update the internal position variable.

Option b) leaves the stream in an unusable state, and the next request will cause option a)
to be performed. It also require a slight rewrite of 'PositionedStoreStream.skipFully' and
'PositionedStoreStream.reposition' to be able to determine the position of the stream (the
length in this case).

Option a) will cause the first page of the stream to be read into the cache (if not already
there), but taken the reason for doing this is an error condition it seems acceptable.

A correct value of the position variable is required for correct/valid operation of PositionedStoreStream.

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