Re: Running schduled jobs
Ravi Sharma wrote: Hi All, I need to run some threads at particular time during the day, does Tomcat provide any such facility? If not then whats the other best way to go for it. Well for scheduled jobs Quartz is a common tool, if java.util.Timer is not sufficient. Certainly not Tomcat-related however as only full JEE containers have buildt-in timer support. Basically i recalculate my site's visitor data every 30 minute and keep in cahce and then display to users, 30 minute delay for my data is fine but atleast i dont need to run queries to find those data for each request. Now every 30 minute i want to run those query and update the cache. How can i achive it.? Trying to use java.util.Timer or Quartz for this particular problem appears architecturally questionable however. Preferably you would have an O/R mapper like Hibernate an rely on some second level cache like EHCache to do thus common DB query caching stuff via configuration instead of implementing such common tasks on your own. Maybe you want to rethink that from an architectural point of view to get things right for all DB queries, unless the problem described is very focused on that particular caching problem. Sometimes OSCache's JSP-based caching can also be a valid solution, if all you want to do is to cache some view results: http://www.opensymphony.com/oscache/wiki/JSP%20Tags.html Thanks, Ravi. Cheers, Michael -- TNG Technology Consulting GmbH, Betastr. 13a, D-85774 Unterföhring Geschäftsführer: Henrik Klagges, Eike Reinel, Christoph Stock Amtsgericht München, HRB 135082 - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Running schduled jobs
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Ravi, On 7/10/2009 10:32 PM, Ravi Sharma wrote: I need to run some threads at particular time during the day, does Tomcat provide any such facility? If not then whats the other best way to go for it. Other than webapp-oriented options, I'd like to remind you (and others) that any decent server OS has the ability to schedule jobs outside of any request-oriented server like Tomcat. Consider using cron on *NIX or the Task Scheduler on Windows or whatever. You can still write your code in Java is you want. I just find that running scheduled jobs from a webapp to be inappropriate at best and inconvenient and unreliable at worst. Schedulers such as cron have the ability to run jobs at strange intervals (such as every day, but only on weekdays), to run jobs missed during system downtime, etc. Basically i recalculate my site's visitor data every 30 minute and keep in cahce and then display to users, 30 minute delay for my data is fine but atleast i dont need to run queries to find those data for each request. Now every 30 minute i want to run those query and update the cache. How can i achive it.? You could write a component that updates visitor data on demand at intervals instead of proactively scheduling it: it's just an expiring cache. Your component returns the cached data unless some time limit has been exceeded, at which point all clients wait while the new set of visitor data is loaded into the cache. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkpY9d4ACgkQ9CaO5/Lv0PC/vACgiHAiV9InIcNcHtIbgszTZ6qm ZY4An26rZiSGInknLAJjzCToU9WqTf0L =/oX1 -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Running schduled jobs
Hi All, I need to run some threads at particular time during the day, does Tomcat provide any such facility? If not then whats the other best way to go for it. Basically i recalculate my site's visitor data every 30 minute and keep in cahce and then display to users, 30 minute delay for my data is fine but atleast i dont need to run queries to find those data for each request. Now every 30 minute i want to run those query and update the cache. How can i achive it.? Thanks, Ravi.
RE: Running schduled jobs
From: Ravi Sharma [mailto:ping2r...@gmail.com] Subject: Running schduled jobs I need to run some threads at particular time during the day, does Tomcat provide any such facility? Tomcat doesn't, but Java does: java.util.Timer. Just make sure to cancel() the timer when your webapp is being stopped. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
