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Groups > comp.lang.java.programmer > #10282

Re: Fav. Memory Stream Impl.

From Jan Burse <janburse@fastmail.fm>
Newsgroups comp.lang.java.programmer
Subject Re: Fav. Memory Stream Impl.
Date 2011-11-28 00:13 +0100
Organization albasani.net
Message-ID <jaug5s$hsi$1@news.albasani.net> (permalink)
References <jaojsb$hso$1@news.albasani.net> <4ed0101b$0$282$14726298@news.sunsite.dk> <jaqhed$23v$1@news.albasani.net> <9jflnkFnrgU1@mid.individual.net>

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Robert Klemme schrieb:
>
> http://docs.oracle.com/javase/6/docs/api/java/io/PipedInputStream.html
> http://docs.oracle.com/javase/6/docs/api/java/io/PipedOutputStream.html
>
> Still, why do you want to do this?  What problem are you trying to
> solve?  I'm not convinced that it is a good idea - especially when using
> unbounded buffers.

A pipe is not a memory stream. In a pipe the reader
does read where the writer does write. But I don't
have this requirement.

The only requirement I have, is that I can use
the memory streams in place of >>TEMPORARY FILES<<.
Whereas >>TEMPORARY FILES<< have a name and usually
exist on some media.

The memory streams should not exist on some media,
except in the memory. But they should share with
 >>TEMPORARY FILES<< multiple readers / writers and
positioninng. Since I can use a >>TEMPORARY FILES<<
name and open a RandomAccessFile with it.

So basically in my application I would like to have
some class, call it MemoryStream. And It would like
to be able to instantiate it. And this instance serves
than as a kind of a file name.

So this instance I should be able to use where I normally
would use the >>TEMPORARY FILES<< name. The only places
that come to my mind are:
   - creating an input stream from a file name, should
     then work from a memory stream instance.
   - creating an output stream from a file name, should
     then work from a memory stream instance.
   - creating a random acccess file from a file name,
     should then work from a memory stream instance.

What the memory stream instance will have in common
with a >>TEMPORARY FILES<< name, is that it will go
away when the application closes. So they are very
similar to >>TEMPORARY FILES<< with the option delete
on close.

Also I would like to be able to use the same memory stream
to open input streams, output streams, random access files,
as many as I want. This is also provided by >>TEMPORARY
FiLES<<, once a >>TEMPORARY FILES<< name is established, it
can be used for all kinds of stuff.

Here is a little example:
    A large clip board: This could be realized by a temporary
    file. When you make the copy operation, you simply write
    the copied content into the temporary file. When you make
    the past operation you reopen the temporary file and
    read the content that should be pasted from it.

The above could be realized by even passing the >>TEMPORARY
FILES<< name around in the system clipboard, so that the copy
paste works across applications. Provided that the applications
understand the content type.

But memory streams cannot passed around like this. Here is
the difference to >>TEMPORARY FILES<<. In their simple
implementation they are confined to the application that
created them.

Of course we could extend them and provide some RMI extension
of them, or what ever, so that the a memory stream references
becomes mobile. Or we could implement them in special shared
memory of the operating system, so that a direct shared access
from multiple applications is possible.

This mobility and shared access across multiple application,
which is a property of >>TEMPORARY FILES<<, is not required
for the memory streams I am looking for. So I guess if my
grandmother could program as she can knit pullovers for me,
she might do a memory stream class for me.

But unfortunately she knows only COBOL and I am looking for
a Java library. But she assured me that something like this
must exist on the web, and that I don't need to go into lengths
to code it by myself. So she told me:

    It's not difficult, but why reinvent the wheel?

Bye

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Thread

Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-25 18:39 +0100
  Re: Fav. Memory Stream Impl. markspace <-@.> - 2011-11-25 10:34 -0800
    Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-25 20:59 +0100
      Re: Fav. Memory Stream Impl. markspace <-@.> - 2011-11-25 12:16 -0800
        Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-25 21:23 +0100
          Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-25 21:23 +0100
            Re: Fav. Memory Stream Impl. markspace <-@.> - 2011-11-25 13:00 -0800
              Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-25 22:32 +0100
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-25 22:36 +0100
                Re: Fav. Memory Stream Impl. Robert Klemme <shortcutter@googlemail.com> - 2011-11-25 23:22 +0100
  Re: Fav. Memory Stream Impl. Arne Vajhøj <arne@vajhoej.dk> - 2011-11-25 17:00 -0500
    Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-26 12:10 +0100
      Re: Fav. Memory Stream Impl. Robert Klemme <shortcutter@googlemail.com> - 2011-11-27 21:43 +0100
        Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-28 00:13 +0100
          Re: Fav. Memory Stream Impl. Robert Klemme <shortcutter@googlemail.com> - 2011-11-28 08:14 +0100
            Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-28 09:10 +0100
              Re: Fav. Memory Stream Impl. Robert Klemme <shortcutter@googlemail.com> - 2011-11-28 02:47 -0800
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-28 14:58 +0100
                Re: Fav. Memory Stream Impl. Robert Klemme <shortcutter@googlemail.com> - 2011-11-28 19:52 +0100
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-29 00:22 +0100
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-29 00:39 +0100
                Re: Fav. Memory Stream Impl. Gene Wirchenko <genew@ocis.net> - 2011-11-28 17:03 -0800
                Re: Fav. Memory Stream Impl. Arne Vajhøj <arne@vajhoej.dk> - 2012-02-06 21:06 -0500
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2012-02-07 09:59 +0100
                Re: Fav. Memory Stream Impl. Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-02-07 09:59 -0800
                Re: Fav. Memory Stream Impl. Arne Vajhøj <arne@vajhoej.dk> - 2012-02-07 21:02 -0500
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2012-02-08 09:55 +0100
                Re: Fav. Memory Stream Impl. "John B. Matthews" <nospam@nospam.invalid> - 2012-02-08 12:18 -0500
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2012-02-08 20:23 +0100
                Re: Fav. Memory Stream Impl. Gene Wirchenko <genew@ocis.net> - 2012-02-08 13:18 -0800
                Re: Fav. Memory Stream Impl. Gene Wirchenko <genew@ocis.net> - 2012-02-08 13:18 -0800
                Re: Fav. Memory Stream Impl. Mayeul <mayeul.marguet@free.fr> - 2011-11-29 12:25 +0100
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-29 14:37 +0100
                Re: Fav. Memory Stream Impl. Lew <lewbloch@gmail.com> - 2011-11-29 07:37 -0800
                Re: Fav. Memory Stream Impl. Martin Gregorie <martin@address-in-sig.invalid> - 2011-11-29 20:26 +0000
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-29 21:34 +0100
                Re: Fav. Memory Stream Impl. Martin Gregorie <martin@address-in-sig.invalid> - 2011-11-29 21:05 +0000
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-29 22:59 +0100
                Re: Fav. Memory Stream Impl. markspace <-@.> - 2011-11-29 14:06 -0800
                Re: Fav. Memory Stream Impl. "John B. Matthews" <nospam@nospam.invalid> - 2011-11-29 21:23 -0500
                Re: Fav. Memory Stream Impl. Martin Gregorie <martin@address-in-sig.invalid> - 2011-11-30 01:08 +0000
                Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-30 14:03 +0100
      Re: Fav. Memory Stream Impl. Arne Vajhøj <arne@vajhoej.dk> - 2012-02-06 20:59 -0500
  Re: Fav. Memory Stream Impl. Roedy Green <see_website@mindprod.com.invalid> - 2011-11-26 00:26 -0800
    Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-26 12:05 +0100
      Re: Fav. Memory Stream Impl. Lew <lewbloch@gmail.com> - 2011-11-26 11:22 -0800
        Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2011-11-26 20:44 +0100
          Re: Fav. Memory Stream Impl. Lew <lewbloch@gmail.com> - 2011-11-26 17:15 -0800
    Re: Fav. Memory Stream Impl. Jan Burse <janburse@fastmail.fm> - 2012-01-28 00:11 +0100

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