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Groups > comp.lang.java.programmer > #19411

Re: RAM FileDescriptor

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On 17/10/2012 11:45 AM, Arne Vajhoej wrote:
> On 10/15/2012 3:59 PM, Daniel Pitts wrote:
>> On 10/15/12 12:07 PM, David Lamb wrote:
>>> I doubt it exists as a general concept and thus probably doesn't exist
>>> in Java. I seem to recall that some operating systems from many years
>>> ago let you map a file into RAM and operate on it from there, but I'm
>>> moderately sure that feature either went through the standard file
>>> system stuff and was (nearly) invisible, or you accessed a massive byte
>>> array directly.
>> Java's NIO does actually have this capability (for example, in
>> MappedByteBuffer)
>>
>> <http://docs.oracle.com/javase/7/docs/api/java/nio/MappedByteBuffer.html>
>
> At least it maps files into virtual address space.
>
> Which is probably what David was talking about.

Yes; I unfortunately often leave out necessary context.

> But strictly speaking it is not mapping into RAM.

You're right, and I did mistakenly reuse the OP's 'RAM' instead of the 
correct "virtual memory"

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RAM FileDescriptor bob smith <bob@coolfone.comze.com> - 2012-10-15 11:08 -0700
  Re: RAM FileDescriptor Lew <lewbloch@gmail.com> - 2012-10-15 11:27 -0700
  Re: RAM FileDescriptor Eric Sosman <esosman@comcast-dot-net.invalid> - 2012-10-15 14:34 -0400
  Re: RAM FileDescriptor Jeff Higgins <jeff@invalid.invalid> - 2012-10-15 14:41 -0400
    Re: RAM FileDescriptor David Lamb <dalamb@cs.queensu.ca> - 2012-10-15 15:07 -0400
      Re: RAM FileDescriptor Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2012-10-15 12:59 -0700
        Re: RAM FileDescriptor Arne Vajhoej <arne@vajhoej.dk> - 2012-10-17 11:45 -0400
          Re: RAM FileDescriptor David Lamb <dalamb@cs.queensu.ca> - 2012-10-17 15:08 -0400
    Re: RAM FileDescriptor Jeff Higgins <jeff@invalid.invalid> - 2012-10-15 15:25 -0400
  Re: RAM FileDescriptor Jeff Higgins <jeff@invalid.invalid> - 2012-10-15 16:22 -0400
    Re: RAM FileDescriptor Jeff Higgins <jeff@invalid.invalid> - 2012-10-15 16:26 -0400
  Re: RAM FileDescriptor Jim Janney <jjanney@shell.xmission.com> - 2012-10-16 12:40 -0600
  Re: RAM FileDescriptor Arne Vajhoej <arne@vajhoej.dk> - 2012-10-17 11:43 -0400
  Re: RAM FileDescriptor Jan Burse <janburse@fastmail.fm> - 2012-10-17 17:55 +0200

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