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Re: Is it possible to send message bursts?

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On 1/2/2023 2:05 PM, Andreas Leitgeb wrote:
> Arne Vajhøj <arne@vajhoej.dk> wrote:
>> On 1/2/2023 5:10 AM, mike wrote:
>>> Problem is when I test this is that I want to send message that first
>>> has some data and then no data giving making read() return -1 and
>>> then data again. Is it possible to create an inputstream that
>>> supports this behaviour?
> 
> I'd think it is possible to create a custom InputStream class
> that allows reading some bytes, then -1 and lateron some more
> bytes, if its read() actually gets called again.
> 
> The problem is, that standard-classes like BufferedReaders, or
> really any Reader, will just not expect further bytes after
> first EOF.  Those wrappers will just assume that an EOF on
> the stream is final, and not even attempt any further read.
> 
> So, if the code (that you want to pass your special stream to)
> relies on wrappers, it just won't work, but if it directly uses
> that InputStream and "knows" that -1 isn't final, it might
> even work - despite being fragile at best, as any software
> implementing undocumented/contradocumented behaviour.

True.

But if it was me then I would go in another direction.

>> I don't understand. read() is a blocking method, so if there
>> is no input it blocks until there is input. It returns -1
>> if end of stream is reached (and stream is then invalid and
>> no point in calling read again).
> 
> Outside of Java world, if stdin is bound to a terminal, then
> receiving an EOF and still being able to read more data till
> next EOF is not quite as bizarre as it might look like to
> Java'ists ;-)

True.

But then that is not really EOF just CTRL/D or CTRL/Z.
being treated like EOF.

Arne

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Thread

Is it possible to send message bursts? mike <mikaelpetterson@hotmail.com> - 2023-01-02 02:10 -0800
  Re: Is it possible to send message bursts? Arne Vajhøj <arne@vajhoej.dk> - 2023-01-02 10:42 -0500
    Re: Is it possible to send message bursts? Andreas Leitgeb <avl@logic.at> - 2023-01-02 19:05 +0000
      Re: Is it possible to send message bursts? Andreas Leitgeb <avl@logic.at> - 2023-01-02 19:13 +0000
      Re: Is it possible to send message bursts? Arne Vajhøj <arne@vajhoej.dk> - 2023-01-02 19:27 -0500
  Re: Is it possible to send message bursts? "e.d.pro...@gmail.com" <e.d.programmer@gmail.com> - 2023-01-03 04:07 -0800

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