Small correction, In your example there is a difference whether you have a multiprocessor machine. On a single-proc machine it will work fine (prevent second user from overwriting), on a multi-processor machine it's undefined.
Regards Leon > -----Ursprüngliche Nachricht----- > Von: Durham David R Jr Contr 805 CSPTS/SCE > [mailto:[EMAIL PROTECTED] > Gesendet: Dienstag, 14. Dezember 2004 23:46 > An: Struts Users Mailing List > Betreff: RE: Preventing concurrent execution of an Action > > You might be able to get away with simply adding 'synchronized' to the > execute method's signature. > > > synchronized public ActionForward execute(...) { > updateXml(); > } > > private void updateXml() { ... } > > > The lock/key threading techniques have to do with, I think, a more > complex threading issue than the one you've presented. > > > - Dave > > > > -----Original Message----- > > From: Behrang Saeedzadeh [mailto:[EMAIL PROTECTED] > > Sent: Tuesday, December 14, 2004 4:34 PM > > To: [EMAIL PROTECTED] > > Subject: Preventing concurrent execution of an Action > > > > Hi > > > > I've an action that creates an XML file on the server. It's executed > > by clicking on a link. I don't want multiple instances of it to be > > executed concurrently. > > > > Does an approach like the following work? > > > > public class UpdateXmlAction ... > > { > > private static final boolean locked; > > > > public void execute(...) { > > > > if (UpdateXmlAction.locked) { > > return; > > } > > > > Synchronized(UpdateXmlAction.class) { > > locked = true; > > updateXml(); > > locked = false; > > } > > > > } > > } > > > > Thanks in advance. > > > > > > -- > > > > Behrang Saeedzadeh > > http://www.jroller.com/page/behrangsa > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
