Does Java have asynchronized I/O?

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George George - 13 Apr 2005 05:19 GMT

Hello everyone,

I am wondering whether Java has asynchronized I/O (whether built-in core
Java SDK or 3rd party release), which is similar as select or poll in UNIX.
Current read/write will be blocked when underlying stream is not ready. For
example, when retrieving data from remote machine, we will be blocked if
the remote machine will not response immediately.

Thanks in advance,
George

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Tony Morris - 13 Apr 2005 06:51 GMT

> Hello everyone,
>
[quoted text clipped - 6 lines]
> Thanks in advance,
> George

Yes, it is "New I/O" (aka nio).
This package claims to be asynchronous I/O, but it is in fact not the same
as UNIX async I/O - it does, however, fulfill your request for something
'similar'.
http://java.sun.com/j2se/1.5.0/docs/guide/nio/index.html

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Tony Morris

JTiger Unit Test Framework for J2SE 1.5
http://www.jtiger.org/
Java Q&A (FAQ, Trivia)
http://qa.jtiger.org/
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George George - 13 Apr 2005 07:08 GMT

Thanks Tony,

I am using JDK 1.3 (not 1.5), and I am wondering whether there are some
asynchronized I/O SDK for Java 1.3.

regards,
George

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Tony Morris - 13 Apr 2005 08:15 GMT

> Thanks Tony,
>
[quoted text clipped - 3 lines]
> regards,
> George

Before 1.4, there is nothing in the core API.
I vaguely remember some third party that was implementing real async I/O,
but buggered if I can remember details.
Google should help.

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Tony Morris

JTiger Unit Test Framework for J2SE 1.5
http://www.jtiger.org/
Java Q&A (FAQ, Trivia)
http://qa.jtiger.org/
http://xdweb.net/~dibblego/

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George George - 15 Apr 2005 15:40 GMT

Thanks Tony,

Can you remember some more key information about the third party library? I
need some key words to make searches.

I have also Googled some third party Java non-blocking I/O libraries, but
all the for JDK 1.3 version libraries are dependent on native libraries. I
want to find some pure Java non-blocking I/O libraries which are written in
pure Java (means platform independent).

regards,
George

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Tony Morris - 15 Apr 2005 17:02 GMT

> Thanks Tony,
>
[quoted text clipped - 8 lines]
> regards,
> George

I have doubts that you'll find non-blocking I/O libraries that are not
dependant on native behaviour.
Sounds to me like you'll have to redefine requirements.
Good luck.

Signature

Tony Morris

JTiger Unit Test Framework for J2SE 1.5
http://www.jtiger.org/
Java Q&A (FAQ, Trivia)
http://qa.jtiger.org/
http://xdweb.net/~dibblego/

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George George - 18 Apr 2005 09:46 GMT

Thanks Tony,

Maybe I have not made myself understood. I mean I want to find an
asynchronized I/O library which is purely implemented by Java (for example,
using Java's internal multiple threading approaches), and not dependent on
native OS capabilities. Do you know where exists a solution for JDK 1.3?

regards,
George

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Thomas Schodt - 18 Apr 2005 17:12 GMT

Tony Morris wrote:

> I have doubts that you'll find non-blocking I/O libraries that are not
> dependant on native behaviour.
> Sounds to me like you'll have to redefine requirements.
> Good luck.

> Maybe I have not made myself understood. I mean I want to find an
> asynchronized I/O library which is purely implemented by Java (for example,
> using Java's internal multiple threading approaches), and not dependent on
> native OS capabilities. Do you know where exists a solution for JDK 1.3?

I don't think your requirements were unclear, rather, I think Tony was
"impressed" by your optimism.

A solution has already been provided: Upgrade to Java 1.4

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George George - 19 Apr 2005 03:04 GMT

Thanks Thomas,

Your reply is very helpful! I will consider your comments carefully.

regards,
George

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Does Java have asynchronized I/O?

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