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Groups > comp.lang.java.programmer > #10345

Re: Fav. Memory Stream Impl.

From Martin Gregorie <martin@address-in-sig.invalid>
Newsgroups comp.lang.java.programmer
Subject Re: Fav. Memory Stream Impl.
Date 2011-11-30 01:08 +0000
Organization UK Free Software Network
Message-ID <jb3vm5$ii7$1@localhost.localdomain> (permalink)
References (11 earlier) <jb2n7d$kgk$1@news.albasani.net> <jb3f5b$e7l$1@localhost.localdomain> <jb3flh$c34$1@news.albasani.net> <jb3hff$e7l$3@localhost.localdomain> <jb3kjd$nb5$1@news.albasani.net>

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On Tue, 29 Nov 2011 22:59:06 +0100, Jan Burse wrote:

> Martin Gregorie schrieb:
>> On Tue, 29 Nov 2011 21:34:54 +0100, Jan Burse wrote:
>>
>>> Martin Gregorie schrieb:
>>>> As you say the individual file sizes are a few tens of bytes, have
>>>> you looked at using ByteInputStream and ByteOutputStream?
>>>>
>>>> If you have considered them, why are they unsuitable?
>>>
>>> They could play a part in the game. But two problems are unsolved:
>>> sharing and positioning.
>>>
>> My bad: I meant ByteArrayInputStream and ByteArrayOutputStream
>>
>> The names are a little confusing: ByteArrayInputStream reads *from* a
>> byte array. The ByteArrayOutputStream writes *into* a byte array.
>>
>> I've used them to move byte arrays to and from CLOB columns in
>> databases,
>> where they were straight-forward to use with CLOB sizes ranging from a
>> few bytes to a few megabytes, though I never had more than one or two
>> instances in use at a time.
>>
>>
> I don't see a constructor where I could hand over a buffer content from
> the memory stream. So that multiple reader and/or writers can share the
> same buffer content.
>
The idea is that you write to the ByteArrayOutputStream, close it, grab 
the byte array using toByteArray() and store that until it is needed. 
Then you construct a ByteArrayInputStream with the byte array as the 
constructor argument. This does, of course, assume that you never want to 
write and read an instance simultaneously. 

I'd think implementing non-simultaneous access should be easy enough to 
bury inside a <MemoryStream> class.

Beyond that I'm guessing since you've said little or nothing about 
whether you need simultaneous read and write access to a <MemoryStream> 
instance, whether an instance gets read more than once and how many 
instances can exist at the same time.


-- 
martin@   | Martin Gregorie
gregorie. | Essex, UK
org       |

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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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