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Re: A stream/pipe that fills only on demand...

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On 07/11/14 09:34, Andreas Leitgeb wrote:
> My needs are a bit different, though:  I need a pipe-stream
> that recognizes reader's request for bytes, and tells the
> writer-end about the requested volume, and then the writer
> will write just as much into the pipe as is needed by the
> reader. The reader just uses the normal API that InputStream
> offers, but I need these calls to identify themselves to the
> pipe-writer, which would use a (yet unspecified) special API,
> so the writer knows how much to put into the pipe-stream.

That's one scenario, but it's not the only one.
What you are essentially describing is a read request, write response.
The reader sends a request to the writer telling it what it wants and
the writer sends a response which the reader can read.

>
> Background is, that the items that the writer will put into
> the pipe-stream are "precious" and must not be wasted.
> Kind of like reading back a stream of serialized data, where
> each de-serializing object must not consume more than its own
> bytes, but the Object needing its data is on a different host
> than the byte stream. That's just an analogy - don't stress it.

When I need to do something similar I use either GenericServlet or RMI. Normally servlet for inter-host and RMI for 
inter-process, but there's no reason why you can't use either approach for either solution. Both of them are suitable 
for request/response operations. RMI has less overhead because it doesn't require a servlet engine, just the rmiregistry.

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Thread

A stream/pipe that fills only on demand... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-11-07 09:34 +0000
  Re: A stream/pipe that fills only on demand... Steven Simpson <ss@domain.invalid> - 2014-11-07 10:00 +0000
    Re: A stream/pipe that fills only on demand... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-11-07 15:14 +0000
  Re: A stream/pipe that fills only on demand... Martin Gregorie <martin@address-in-sig.invalid> - 2014-11-07 12:27 +0000
    Re: A stream/pipe that fills only on demand... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-11-07 15:13 +0000
  Re: A stream/pipe that fills only on demand... Robert Klemme <shortcutter@googlemail.com> - 2014-11-08 11:20 +0100
  Re: A stream/pipe that fills only on demand... Nigel Wade <nmw@ion.le.ac.uk> - 2014-11-10 09:24 +0000
    Re: A stream/pipe that fills only on demand... Andreas Leitgeb <avl@auth.logic.tuwien.ac.at> - 2014-11-29 16:02 +0000

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