[jira] Commented: (HARMONY-5635) [classlib][luni][performance] ObjectInputStream should empty the underlying stream in right way

["Tim Ellison (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-5635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12582667#action_12582667 ] 

Tim Ellison commented on HARMONY-5635:
--------------------------------------

Aleksey,

Removed the static modifier at repo revision r641839.

re: (1) How could the code succeed in writing to an InputStream anyway?


> [classlib][luni][performance] ObjectInputStream should empty the underlying stream in right way
> -----------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5635
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5635
>             Project: Harmony
>          Issue Type: Improvement
>            Reporter: Aleksey Shipilev
>            Assignee: Tim Ellison
>         Attachments: 0003-serial-emptystream.patch
>
>
> For now, ObjectInputStream empties the underlying stream by assigning it to static emptyStream instance.
> This is very buggy way to do things, for two reasons:
>  1. Consider you've done
>          ByteArrayInputStream temp1 = emptyStream;
>      then you might do temp1.write(...) and spoil the emptyStream with garbage. Luckily there are no such opportunities in current OIS.
>  2. Consider you've "emptied" several streams in different threads and then ask for OIS.available() then you would have the BAIS.available() [synchronized by spec] - and the _contention_, up to fat monitors invocation.

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