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Date: Mon, 22 May 2006 17:17:50 +0800
From: "Andrew Zhang" <zhanghuangzhu@gmail.com>
To: harmony-dev@incubator.apache.org
Subject: Re: [classlib] [jira] Commented: (HARMONY-410) method
 decode(ByteBuffer, CharBuffer,
 boolean) should set correct position in ByteBuffer
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Hi, Mikhail and Vladimir,

I'd rather consider it as compatibility bug and close it as wontfix.

"Did I get it right that both solutions do not contradict to the spec and
that RI acts as the second one?"

Partly right. Vladimir, maybe as you know, deep studying on decode will sho=
w
many RI's unreasonable behaviours.

Since RI's behaviour is not logical and the spec description is very vague
in some situations (e.g. decode state defination, in/out buffer poistion
defination),

we finally decided not to follow RI's behaviour.

IMO, current Harmony implementation complies with spec strictly, acts in
logical way and also doesn't affect end-users.
So I'd rather consider it as compatibility bug and close it as wontfix.

What's your opnion?

Thanks.


On 5/15/06, Vladimir Strigun <vstrigun@gmail.com> wrote:
>
> On 5/5/06, Mikhail Loenko <mloenko@gmail.com> wrote:
> > 2006/5/5, Vladimir Strigun <vstrigun@gmail.com>:
> > > On 5/5/06, Mikhail Loenko <mloenko@gmail.com> wrote:
> > > > Vladimir, Andrew
> > > >
> > > > 2006/4/26, Andrew Zhang <zhanghuangzhu@gmail.com>:
> > > > > Here I propose two solutions:
> > > > >
> > > > > 1. Set the ByteBuffer to the limit, and store the remaining
> ByteBuffer in
> > > > > decoder. Invokers doesn't care the position of in. If the result
> is
> > > > > UNDERFLOW and there're furthur input, just pass the new input to
> the
> > > > > decoder. It's a typical streaming decoder.  That's what Harmony
> does
> > > > > currently.
> > > > >
> > > > > 2. Decoder doesn't store remaining ByteBuffer. Position of "in" i=
s
> set to
> > > > > indicate the remaining ByteBuffer. Invoker should take care to
> generate new
> > > > > input ByteBuffer for next invocation.  RI acts in this way.
> > > > >
> > > > > Both are acceptable.
> > > >
> > > >
> > > > Did I get it right that both solutions do not contradict to the spe=
c
> > > > and that RI acts as the second one?
> > >
> > > Mikhail,
> > >
> > > you absolutely right. I think this issue could be closed, but possibl=
y
> > > it would be better to mark it as non-bug difference from RI.
> > > Richard, what do you think?
> >
> > In this case according to our compatibility guidelines we should switch
> > behavior to RI-like.
>
> Andrew,
>
> what do you think about it? I think we should mark it as compatibility
> bug and close it as wontfix. If we will switch to RI behaviour, we
> need to check all decoding operations in java.io package and possibly
> correct some methods.
>
> Thanks.
> Vladimir.
>
>
> > Thanks,
> > Mikhail
> >
> >
> >
> > >
> > >
> > > Thanks.
> > > Vladimir.
> > >
> > > > Thanks,
> > > > Mikhail
> > > >
> > > >
> > > > >
> > > > > However, I think solution 1 is more reasonable.
> > > > >
> > > > > "Is it possible to store bytes in decoder, support streaming
> decoding, and,
> > > > > at the same time sets correct position in input buffer after each
> operation?
> > > > > "
> > > > >
> > > > > Yes.  In fact, your patch will make Harmony act as the descriptio=
n
> above.
> > > > >
> > > > > However, I don't think it solve the problem. Maybe invoker is mor=
e
> > > > > confusable and may think:
> > > > >
> > > > > "Is the remaining bytebuffer maintained in decoder or in ?  Shall
> I get the
> > > > > remaining buffer from in and pass it for next invocation?"
> > > > >
> > > > > Anyway, we need a decision on this compatibility issue.
> > > > > By the way, Vladimir, does solution one cause any problem on othe=
r
> classlib
> > > > > implementation?
> > > > >
> > > > > Any comment?
> > > > >
> > > > > Thanks !
> > > > >
> > > > >
> > > > > Vladimir Strigun commented on HARMONY-410:
> > > > > ------------------------------------------
> > > > >
> > > > > Hi Richard,
> > > > >
> > > > > Thanks for the clarification, I agree that streaming decode is
> good thing,
> > > > > but I'd like to explain my understanding of specification :)
> > > > > According to specification of CharsetDecoder decoding operation
> should
> > > > > process by the following steps:
> > > > > "
> > > > > 2. Invoke the decode method zero or more times, as long as
> additional input
> > > > > may be available, passing false for the endOfInput argument and
> filling the
> > > > > input buffer and flushing the output buffer between invocations;
> > > > >
> > > > > 3. Invoke the decode method one final time, passing true for the
> endOfInput
> > > > > argument; and then
> > > > > "
> > > > > spec also says:
> > > > > "The buffers' positions will be advanced to reflect the bytes rea=
d
> and the
> > > > > characters written, but their marks and limits will not be
> modified"
> > > > >
> > > > > I understand these sentences in the next way:
> > > > > invoke decode with endOfInput =3D false if you have additional
> input, then
> > > > > fill the buffer (i.e. add to buffer some additional input), invok=
e
> decode
> > > > > again and pass correct endOfInput parameter dependent of
> availability of
> > > > > input.
> > > > >
> > > > > Example you provided is very useful and, of course, 1st option
> looks better,
> > > > > but what I'm suggest here is to reflect actual processed bytes in
> input.
> > > > > After first invocation of decode, not all bytes processed
> actually, i.e.
> > > > > almost all bytes processed, but some stored in decoder to further
> operation.
> > > > > Is it possible to store bytes in decoder, support streaming
> decoding, and,
> > > > > at the same time sets correct position in input buffer after each
> operation?
> > > > >
> > > > > Thanks.
> > > > > Vladimir.
> > > > >
> > > > > > method decode(ByteBuffer, CharBuffer, boolean) should set
> correct position
> > > > > in ByteBuffer
> > > > > >
> > > > >
> -------------------------------------------------------------------------=
---------------
> > > > > >
> > > > > >          Key: HARMONY-410
> > > > > >          URL: http://issues.apache.org/jira/browse/HARMONY-410
> > > > > >      Project: Harmony
> > > > > >         Type: Bug
> > > > >
> > > > > >   Components: Classlib
> > > > > >     Reporter: Vladimir Strigun
> > > > > >     Assignee: Mikhail Loenko
> > > > > >     Priority: Minor
> > > > > >  Attachments: Harmony-410_patch.txt, harmony-410_test.txt
> > > > > >
> > > > > > When ByteBuffer contain incomplete sequence of bytes for
> successful
> > > > > decoding, position in ByteBuffer should be set to latest
> successful byte. I
> > > > > will attach testcase and patch soon.
> > > > >
> > > > > --
> > > > > This message is automatically generated by JIRA.
> > > > > -
> > > > > If you think it was sent incorrectly contact one of the
> administrators:
> > > > >  http://issues.apache.org/jira/secure/Administrators.jspa
> > > > > -
> > > > > For more information on JIRA, see:
> > > > >  http://www.atlassian.com/software/jira
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Andrew Zhang
> > > > > China Software Development Lab, IBM
> > > > >
> > > > >
> > > >
> > > >
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--=20
Andrew Zhang
China Software Development Lab, IBM

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