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From "Joe Shaw (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENENET-8) Throwing an exception as a result of a normal situation is extremely bad in .net
Date Mon, 16 Oct 2006 20:17:51 GMT
    [ http://issues.apache.org/jira/browse/LUCENENET-8?page=comments#action_12442687 ] 
            
Joe Shaw commented on LUCENENET-8:
----------------------------------

As pointed out later in the linked thread, LUCENE-388 is *not* the same issue as this one.
 And that issue still exists in the Java version as well (where throwing exceptions for normal
flow is also very bad)

> Throwing an exception as a result of a normal situation is extremely bad in .net
> --------------------------------------------------------------------------------
>
>                 Key: LUCENENET-8
>                 URL: http://issues.apache.org/jira/browse/LUCENENET-8
>             Project: Lucene.Net
>          Issue Type: Task
>         Environment: Windows XP, Visual Studio 2003
>            Reporter: Jo Inge Arnes
>         Assigned To: George Aroush
>         Attachments: test.patch
>
>
> At the end of the FastCharStream.Refill() method, it says:
> int charsRead = input.Read(buffer, newPosition, buffer.Length - newPosition);
> if (charsRead <= 0)
>    throw new System.IO.IOException("read past eof");
> else
>    bufferLength += charsRead;
> When I run Lucene in the debugger, this causes an exception to be thrown all the time.
> To me it looks like it is thrown as a result of a normal situation, not because of some
critical error.
> Is this correct?
> If this is the case, then the code is horrible. Throwing an exception in .NET is extremely
slow, and should never be thrown as a result of a normal situation. I repeat: "extremely slow"

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