Exclusive file lock

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Bruintje Beer - 21 Dec 2007 17:58 GMT

Hi,

I was wondering if there is a way to open a data file in exclusive mode not
using the nio package. The reason for not using the nio package is not
relevant I am just interrested in some kind of solution.

John

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Hunter Gratzner - 21 Dec 2007 18:51 GMT

> I was wondering if there is a way to open a data file in exclusive mode not
> using the nio package. The reason for not using the nio package is not
> relevant

So you thing we are not worthy to know some background. But we should
be glad to be at your service.

Hint: Hire a consultant if you need to have someone you can push
around.

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Daniel Pitts - 21 Dec 2007 19:02 GMT

> Hi,
>
[quoted text clipped - 3 lines]
>
> John

Exclusive file locks are often OS specific, and as such difficult to
have a OS neutral implementation.

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Roedy Green - 21 Dec 2007 19:29 GMT

>I was wondering if there is a way to open a data file in exclusive mode not
>using the nio package. The reason for not using the nio package is not
>relevant I am just interrested in some kind of solution

Only some half-assed solutions.

see http://mindprod.com/jgloss/lockedfiles.html

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Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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Arne Vajhøj - 21 Dec 2007 23:13 GMT

> I was wondering if there is a way to open a data file in exclusive mode not
> using the nio package. The reason for not using the nio package is not
> relevant I am just interrested in some kind of solution.

Write some C code and call it via JNI.

Arne

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Lew - 22 Dec 2007 01:32 GMT

Bruintje Beer wrote:

>> I was wondering if there is a way to open a data file in exclusive
>> mode not using the nio package. The reason for not using the nio
>> package is not relevant I am just interrested in some kind of solution.

How come you don't want to use NIO?

> Write some C code and call it via JNI.

Assuming an OS for which it's possible to take out such a lock on a file.

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Lew

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EJP - 22 Dec 2007 05:01 GMT

> The reason for not using the nio package is not
> relevant

Your reason for not using the only package that provides a solution is
*extremely* relevant.

You only have to use NIO for the lock, not for the I/O. Start with a
FileInputStream or RandomAccessFile, get the FileChannel from that, and
lock the file.

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Exclusive file lock

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