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From "Allistair Crossley" <Allistair.Cross...@QAS.com>
Subject RE: How to run servlet for every 30 minutes in Tomcat 4.1.30
Date Tue, 21 Dec 2004 17:02:34 GMT
of course you can ... look up http://jakarta.apache.org/commons/dbcp/ and commons-pool or your
database's driver may even have an implementation that supports pooling that you can instantiate
directly with the javax.sql or java.sql api.

cron(30s) --> 
  socket call --> 
    your app (ServerSocket) --> 
      spawn some new handler thread
        call database (dbcp e.g) -->
        get reply
        call client via xmlrpc 
        get reply
        call database
      delete handler thread or put back into a pool
      ServerSocket wait

> -----Original Message-----
> From: Shilpa Nalgonda [mailto:snalgonda@mypublisher.com]
> Sent: 21 December 2004 16:41
> To: Tomcat Users List; Billy Talton
> Subject: RE: How to run servlet for every 30 minutes in Tomcat 4.1.30
> 
> 
> My application has to use the connection pooling of Tomcat to 
> talk to the
> database...
> and all my Database access classes are deployed om 
> Tomcat...so if i just
> write a java standalone command line program,
> can i access those connection pooling classes...
> 
> -----Original Message-----
> From: Billy Talton [mailto:billy.talton@gmail.com]
> Sent: Tuesday, December 21, 2004 11:41 AM
> To: Tomcat Users List
> Subject: Re: How to run servlet for every 30 minutes in Tomcat 4.1.30
> 
> 
> Why are you writing a servlet for this?  If the application does not
> use any of the services confined to the Servlet API and Tomcat, just
> write a stand-alone application and setup up a cron job to run it.
> Seems like overkill to me.
> 
> 
> On Tue, 21 Dec 2004 16:28:49 -0000, Allistair Crossley
> <Allistair.Crossley@qas.com> wrote:
> > no, and I believe doing so it bad practice. use some OS 
> controlled timer
> like cron to issue a HTTP call to your servlet. I once wrote 
> a shell script
> that calls a http address on the local machine but cannot 
> remember how ;) if
> you are using oracle then you can setup this timer thread inside the
> database itself. don't add a thread into your web application.
> >
> > > -----Original Message-----
> > > From: Shilpa Nalgonda [mailto:snalgonda@mypublisher.com]
> > > Sent: 21 December 2004 16:14
> > > To: Tomcat Users List
> > > Subject: RE: How to run servlet for every 30 minutes in 
> Tomcat 4.1.30
> > >
> > >
> > > Thanks for the reply...
> > >
> > > The application which i am trying to write is a standalone
> > > utility.. Client
> > > does not hit this servlet.
> > >
> > > Instead my application which is a servlet, will make some
> > > database calls--
> > > and if the required data is present in the database, then
> > > that data is sent
> > > to the client via xmlrpc call and the response from the 
> xmlrpc call is
> > > updated back into the dataabse.
> > >
> > > So we want this utility preferably servlet in our Tomcat
> > > container to be run
> > > every 30 minutes like a cron job, to do the database updates..
> > >
> > > There are so many other classes deployed on Tomcat and i want
> > > to use those
> > > classes to write this servlet utility.
> > > This is the reason why chose to use servlet, but is there any
> > > configurable
> > > parameter to run servlet for every 30 minutes...
> > >
> > > -----Original Message-----
> > > From: Wade Chandler [mailto:wchandler@redesetgrow.com]
> > > Sent: Tuesday, December 21, 2004 11:03 AM
> > > To: Tomcat Users List
> > > Subject: Re: How to run servlet for every 30 minutes in 
> Tomcat 4.1.30
> > >
> > >
> > > Shilpa Nalgonda wrote:
> > > > Hi,
> > > > I am using Tomcat4.1.30 version.
> > > > I have to develop a client application which looks in the
> > > database every
> > > 30
> > > > minutes,
> > > > to retrieve the status of an order and send the status 
> to the remote
> > > client.
> > > > Again waits for the
> > > > The client's response and insert the repsonse back to 
> the database.
> > > >
> > > > I wanted to do this in a servlet, so is there any way that
> > > i could run
> > > this
> > > > servlet automatically inside the
> > > > Tomcat container, or is it configurable in servlet mapping?
> > > if so can
> > > > someone please suggest me with examples...
> > > >
> > > >
> > > >
> > > 
> ---------------------------------------------------------------------
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> > > >
> > > >
> > > >
> > >
> > > Well....it's kind of not extremely clear what you are 
> asking, but why
> > > does the servlet need to do anything except listen for a
> > > client which is
> > > threaded to do this every 30 minutes, in other words...why
> > > not have the
> > > servlet do what it naturally does...sit there and get hit 
> by client
> > > requests....get the info....and send it back?  I 
> mean...the servlet
> > > can't push to the client unless you want to use something
> > > besides http,
> > > or unless you are using servlets on both ends and http 
> servers on both
> > > ends.  You could use keep alives I guess.....I wouldn't 
> though....only
> > > so many tcp/ip connections.
> > >
> > > Wade
> > >
> > >
> > > 
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> > >
> > >
> >
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> > <a href="http://www.qas.com">www.qas.com</a>
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