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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: How to enable JNA for Cassandra on Windows?
Date Fri, 23 Sep 2011 12:49:26 GMT
mmap is supported by the JDK, jna is not required.

On Fri, Sep 23, 2011 at 5:07 AM, Viktor Jevdokimov <
Viktor.Jevdokimov@adform.com> wrote:

> I found that there‘s no C library under Windows, and msvcrt does not
> provide mlockall function, so currently there‘s no way to use JNA under
> Windows. That way mmap is not a good idea?****
>
> ** **
>
> ** **
> **
>
> ** **
>
> Best regards/ Pagarbiai****
>
> ** **
>
> *Viktor Jevdokimov*
>
> Senior Developer****
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> Email:  Viktor.Jevdokimov@adform.com****
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> *From:* Viktor Jevdokimov [mailto:vjevdokimov@gmail.com]
> *Sent:* Thursday, September 22, 2011 15:01
> *To:* user@cassandra.apache.org
> *Subject:* How to enable JNA for Cassandra on Windows?****
>
> ** **
>
> Hi,****
>
> ** **
>
> I'm trying without success to enable JNA for Cassandra on Windows.****
>
> ** **
>
> Tried to place JNA 3.3.0 libs jna.jar and platform.jar into Cassandra 0.8.6
> lib dir, but getting in log:****
>
> Unable to link C library. Native methods will be disabled.****
>
> ** **
>
> What is missed or what is wrong?****
>
> ** **
>
> One thing I've found on inet about JNA and Windows is this sample:****
>
> ** **
>
> // Library is c for unix and msvcrt for windows
>
> String libName = "c";
> if (System.getProperty("os.name").contains("Windows"))
> {
>   libName = "msvcrt";
>
> ****
>
> }
>
> ****
>
> // Loading dynamically the library
> CInterface demo = (CInterface) Native.loadLibrary(libName, CInterface.class); ****
>
> ** **
>
> from http://www.scriptol.com/programming/jna.php****
>
> ** **
>
> while in Cassandra:****
>
> ** **
>
> try****
>
>     {****
>
>         Native.register("c");****
>
>     }****
>
>     catch (NoClassDefFoundError e)****
>
>     {****
>
>         logger.info("JNA not found. Native methods will be disabled.");****
>
>     }****
>
>     catch (UnsatisfiedLinkError e)****
>
>     {****
>
>         logger.info("Unable to link C library. Native methods will be disabled.");****
>
>     }****
>
>     catch (NoSuchMethodError e)****
>
>     {****
>
>         logger.warn("Obsolete version of JNA present; unable to register C library. Upgrade
to JNA 3.2.7 or later");****
>
>     }****
>
> ** **
>
> Is it true that for Windows Cassandra should do something like:****
>
> ** **
>
> if (System.getProperty("os.name").contains("Windows"))
>
> {
>     Native.register("msvcrt");
> }****
>
> else****
>
> {****
>
>     Native.register("c");
> }****
>
> ** **
>
> ** **
>
> Thanks****
>
> Viktor****
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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