This looks promising, but what do they do differently than just starting a deamon thread and doing some background work?
Why bother with this if you can start your own custom thread, or do they do something else? --- Kwok Peng Tuck <[EMAIL PROTECTED]> wrote: > Hello Riaan, you might want to check out jcrontab. > > http://jcrontab.sourceforge.net > > Riaan Oberholzer wrote: > > >Well, that was part of my question.... if I > >cannot/don't implement daemon threads to do e.g. > >automatic daily tasks, what else? E.g, at the end > of > >the day send an e-mail to a (real life) manager > with a > >summary of the day's transactions.... something > like > >that. > > > >Does Tomcat provide some sort of ActionEvent which > you > >can configure to be fired every x milliseconds? > > > > > > > >--- Tim Funk <[EMAIL PROTECTED]> wrote: > > > > > >>You can create threads all day in tomcat, but here > >>are the importnatn things > >>to consider: > >>- WHY! Are threads really the correct solution? > >>- If you create threads - what are their scope? > >>Daemon, non-daemon? > >>- If you create non-daemon threads - be prepared > for > >>the consequences such as > >>the JVM not going away on tomcat shutdown unless > you > >>have taken the needed > >>precautions. > >>- If you create dameon only threads, be prepared > for > >>when tomcat shuts down > >>and your daemon still has work to do because the > JVM > >>could exit before your > >>thread is ready to complete its unit of work > >>- WHY! Are threads really the correct solution? > >>- And last but not least: WHY! Are threads really > >>the correct solution? > >> > >>-Tim > >> > >>Riaan Oberholzer wrote: > >> > >> > >>>I've mainly worked in BEA WebLogic before and > from > >>>colleagues and other sources I have heard it is > >>> > >>> > >>not > >> > >> > >>>recommended (and sometimes not allowed, some even > >>>said) to create threads in your application. > >>> > >>> > >>Indeed, > >> > >> > >>>when the application went live in a multi-server > >>>clustered environment, we got very inconsistent > >>>results because of the threads, so we had to > >>> > >>> > >>remove > >> > >> > >>>them. > >>> > >>>Question is, how safe is it to create threads in > a > >>>Tomcat web-app? I would assume "worker" threads > >>> > >>> > >>are > >> > >> > >>>ok, i.e. threads you create to do a specific task > >>> > >>> > >>and > >> > >> > >>>then it terminates. When you are guaranteed the > >>> > >>> > >>thread > >> > >> > >>>will terminate either because of an error or > >>> > >>> > >>because > >> > >> > >>>the assigned task has been completed. > >>> > >>>But what about "monitor" threads, i.e. threads > >>> > >>> > >>that > >> > >> > >>>does a Thread.sleep(x) for an hour, check some > >>>condition and goes back to sleep... some > mechanism > >>> > >>> > >>you > >> > >> > >>>implement to e.g. do a task on a > >>> > >>> > >>hourly/daily/weekly > >> > >> > >>>base. You'd create the thread (and keep a handle > >>> > >>> > >>to > >> > >> > >>>it) in either an InitServlet.init() and then > >>>Thread.interrupt() in the InitServlet.destroy(), > >>> > >>> > >>or > >> > >> > >>>you can do it in an ApplicationListener > (something > >>>like that) class which I think you can define in > >>> > >>> > >>the > >> > >> > >>>web.xml. > >>> > >>>How else can you implement that (monitoring) in > >>>Tomcat? > >>> > >>> > >> > >> > >> > >--------------------------------------------------------------------- > > > > > >>To unsubscribe, e-mail: > >>[EMAIL PROTECTED] > >>For additional commands, e-mail: > >>[EMAIL PROTECTED] > >> > >> > >> > > > > > >__________________________________ > >Do you Yahoo!? > >Yahoo! SiteBuilder - Free, easy-to-use web site > design software > >http://sitebuilder.yahoo.com > > > >--------------------------------------------------------------------- > >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] > __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
