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From "Sebb (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NET-437) TelnetInputStream doesn't support non-blocking IO when reader thread is not enabled
Date Mon, 09 Jan 2012 22:23:39 GMT

    [ https://issues.apache.org/jira/browse/NET-437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13182864#comment-13182864
] 

Sebb commented on NET-437:
--------------------------

I'm not quite sure why it's important to check __bytesAvailable?

Perhaps the condition should be coded as follows:

{code}
if (__threaded) {
    return __bytesAvailable;
} else {
    return __bytesAvailable + super.available();
}
{code}

This should return a value closer to the actual number available.
                
> TelnetInputStream doesn't support non-blocking IO when reader thread is not enabled
> -----------------------------------------------------------------------------------
>
>                 Key: NET-437
>                 URL: https://issues.apache.org/jira/browse/NET-437
>             Project: Commons Net
>          Issue Type: Bug
>          Components: Telnet
>    Affects Versions: 3.0.1
>         Environment: Java 6 + commons-net-3.0.1
>            Reporter: Gavin Camp
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> When the telnet client is used without allowing it to create it's own reader thread (i.e.
setReaderThread(false)) then the TelnetInputStream.available() method will always return 0
bytes available.  This makes non-blocking IO impossible as you need to actualy call read to
get the data without knowing if it will block or not.
> This fix to the available method in org.apache.commons.net.telnet.TelnetInputStream,
seems to fix the issue, and should work for reader threads as well:
> {noformat} 
>     @Override
>     public int available() throws IOException
>     {
>         // Critical section because run() may change __bytesAvailable
>         synchronized (__queue)
>         {
>         	if (__bytesAvailable == 0 && !__threaded) {
>         		return super.available();
>         	} else {
>         		return __bytesAvailable;
>         	}
>         }
>     }
> {noformat} 

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