Re: [basex-talk] Best practices for concurrency

Hi Gary,

if you want to deal with concurrency issues, you'll indeed have to stick with one single context. What you can do, however, is to explicitly register a process, as I've shown in the mail to Rainer just a minute ago.

Best, Christian ___________________________

Thank-you both. I'm currently creating new context before executing queries on the local database and it seems to be handling the concurrency well already, but I guess I may have just been lucky so far. I'll add the LocalSession bit and see how that works out.

Cheers Gary ________________________________ From: Christian Grün christian.gruen@gmail.com To: Andreas Weiler andreas.weiler@uni-konstanz.de Cc: The Trainspotter wys01@btinternet.com; "basex-talk@mailman.uni-konstanz.de" basex-talk@mailman.uni-konstanz.de Sent: Tuesday, 23 October 2012, 12:55 Subject: Re: [basex-talk] Best practices for concurrency

Hi Gary,

as Andreas mentioned, the server approach will ensure that all operations will be concurrently handled. An alternative, however, is to create a LocalSession instance, which provides the same interface and functionality as the ClientSession class, but does not rely on a database server. A little example (I hope I didn't introduce any typos):

Context ctx = new Context();
LocalSession ls = new LocalSession(ctx);
ls.execute(new CreateDB("db", "<a/>"));
System.out.println(ls.execute(new XQuery("db:open('db')")));
ctx.close();

Best, Christian ___________________________

On Sun, Oct 21, 2012 at 12:42 PM, Andreas Weiler andreas.weiler@uni-konstanz.de wrote:

...

Hi Gary,

best approach is to run a local server and then use client sessions. If you dont want to run a server, you need one seperate context for each thread.

-- Andreas

Am 20.10.2012 um 17:53 schrieb The Trainspotter:

Hi,

I've read through the online example on server concurrency, however, currently I'm not running a BaseXServer instance I'm just running things locally. I want multiple threads in my application to be able to query the database at once without treading on each others toes. What's the best approach for doing this?

I have tried querying the database using different threads but I keep getting internal BaseX errors which leads me to think I'm going about this the wrong way.

Cheers Gary _______________________________________________ BaseX-Talk mailing list BaseX-Talk@mailman.uni-konstanz.de https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk

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