Re: Equivalent of Resin "run-at" servlet configuration

[Parsons Technical Services]

With all the questions and suggestions flying around, a question to the 
other programmers: If one was to write a class for the purpose of running 
classes at set times, what pitfalls would one need to watch for?

I have a class that loads on startup and runs a continuous loop that is 
timed (sleeps, wakes up, does something, sleeps again). It runs fine, but I 
know that it could be better.

Any guidance or suggestions would be appreciated. And maybe we could create 
an add-on and post it for use in apps that need such a device.

Thanks
Doug
----- Original Message ----- 
From: "Nikola Milutinovic" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Thursday, March 03, 2005 6:55 AM
Subject: Re: Equivalent of Resin "run-at" servlet configuration


Subramanya Sastry wrote:
Hello,
I am developing a Java web application, and one of the requirements is to 
run a particular servlet periodically, or even at specified times.  Resin 
provides this ability via its "run-at" configuration element for servlets 
in web.xml

Example Resin configuration:
  <servlet>
     <servlet-name>download</servlet-name>
     <servlet-class>DownloadNewsServlet</servlet-class>
     <run-at period='360m'/>
  </servlet>
However, I haven't found an equivalent configuration for Tomcat.  I 
searched
the web and was unsuccessful.  So, any pointers as to how I could achieve 
this
for Tomcat would be appreciated.

There is none and shouldn't be any. I understand the need to run 
periodical tasks, but J2EE specification, prior to 1.4 has no such 
provisions. Further, Servlet/JSP specification has no such provision, even 
in J2EE 1.4. You'd be best advised to setup a cron-job to perform this 
periodic activity. There are several good HTTP client packages out there, 
Jakarta-Commons HTTPclient, to name one, that will help you in building 
the client side of your cron-job.

Nix.
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