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Posted to users@tomcat.apache.org by yo...@darkmag.net on 2003/05/20 14:12:46 UTC
[Half-OT] Background apps in webapp ?
Hail,
I've to developp a small java app for my webapp ; it must check every 10
mins (for example) some data into my oracle database and react according
to some values (still for example, if a date stored in a field is today,
send a mail to a person).
I thought I may build a standalone app, which would run in background. But
i'd like this app to retrieve data from my webapp's web.xml (as you can do
in servlets/tags/snippets with getInitParameter())
Is there a technology which allow such things ? Or should i try to "force"
the parsing of the web.xml file while completely ignoring the webapp &
Tomcat's features ? Or, do you have other ideas ? :)
Thx a lot,
Yogi
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Re: [Half-OT] Background apps in webapp ?
Posted by Tim Funk <fu...@joedog.org>.
If an app needs run every X minutes|hours --> use cron
Parsing xml in java is "easy" (google is your friend). Even perl might do
what you want (easier, ymmv)
Or using cron to spawn a script (which calls wget) to hit a "protected" web
page might do the trick.
-Tim
yogi-ml@darkmag.net wrote:
> Hail,
>
> I've to developp a small java app for my webapp ; it must check every 10
> mins (for example) some data into my oracle database and react according
> to some values (still for example, if a date stored in a field is today,
> send a mail to a person).
>
> I thought I may build a standalone app, which would run in background. But
> i'd like this app to retrieve data from my webapp's web.xml (as you can do
> in servlets/tags/snippets with getInitParameter())
>
> Is there a technology which allow such things ? Or should i try to "force"
> the parsing of the web.xml file while completely ignoring the webapp &
> Tomcat's features ? Or, do you have other ideas ? :)
>
> Thx a lot,
>
> Yogi
>
>
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Re: [Half-OT] Background apps in webapp ?
Posted by Emerson Cargnin <em...@tre-sc.gov.br>.
I made an webapp that needed to check for timed-out users, so I created
a thread int he init method of servlet, it just works great : )
code snippet:
UsersPolling poolUsers = new UsersPolling(users, configuracao);
poolUsers.start();
run method of thread :
public void run()
{
//loop infinito dando pooling nos usuarios
while (true)
{
try
{
sleep(Integer.parseInt(config.USERSPOOLINTERVAL) * 60000);
Enumeration usersenum = users.elements();
java.util.Date agora=new java.util.Date();
while (usersenum.hasMoreElements())
{
Usuario auxuser = (Usuario) usersenum.nextElement();
long
tempoSemAcesso=agora.getTime()-auxuser.getLastAcess().getTime();
long
tempoConectado=agora.getTime()-auxuser.getLoginTime().getTime();
if
((tempoSemAcesso)>(Integer.parseInt(config.SERVICETIMEOUT)*60000))
{
users.remove(auxuser.getId());
System.out.println("Usuario
"+auxuser.getNomeUsuario()+" desconectado por timeout
:"+(tempoSemAcesso/60000)+" minutos");
System.out.println("Login :
"+auxuser.getLoginTime()+" Agora : "+agora);
System.out.println("Permaneceu conectado por :
"+tempoConectado+" Agora : "+agora);
}
}
}
catch (InterruptedException e)
{
System.out.println(e);
}
}
Ari Suutari wrote:
>Hi,
>
>On Tuesday 20 May 2003 15:12, yogi-ml@darkmag.net wrote:
>
>
>>Hail,
>>
>>I've to developp a small java app for my webapp ; it must check every 10
>>mins (for example) some data into my oracle database and react according
>>to some values (still for example, if a date stored in a field is today,
>>send a mail to a person).
>>
>>
>>
>
> I have written a small servlet, which starts a thread in
> init method and stops it in destroy method. Then,
> I have configured web.xml to load this servlet when
> tomcat starts.
>
> In your case the thread's run-method would
> just sleep for 10 minutes, then do the work
> and go back to sleep.
>
> Ari S.
>
>
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>To unsubscribe, e-mail: tomcat-user-unsubscribe@jakarta.apache.org
>For additional commands, e-mail: tomcat-user-help@jakarta.apache.org
>
>
>
>
--
Emerson Cargnin
Analista de Sitemas
Setor de Desenvolvimento de Sistemas - TRE-SC
tel : (048) - 251-3700 - Ramal 3181
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Re: [Half-OT] Background apps in webapp ?
Posted by yo...@darkmag.net.
GREAT idea !
gonna check that right now.
Thx all for your answers, but i'd like it to be as easy as possible for
system backups/restores, so no cron and other subtilites.
YoGi
> I have written a small servlet, which starts a thread in
> init method and stops it in destroy method. Then,
> I have configured web.xml to load this servlet when
> tomcat starts.
>
> In your case the thread's run-method would
> just sleep for 10 minutes, then do the work
> and go back to sleep.
>
> Ari S.
>
>
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Re: [Half-OT] Background apps in webapp ?
Posted by Ari Suutari <ar...@syncrontech.com>.
Hi,
On Tuesday 20 May 2003 15:12, yogi-ml@darkmag.net wrote:
> Hail,
>
> I've to developp a small java app for my webapp ; it must check every 10
> mins (for example) some data into my oracle database and react according
> to some values (still for example, if a date stored in a field is today,
> send a mail to a person).
>
I have written a small servlet, which starts a thread in
init method and stops it in destroy method. Then,
I have configured web.xml to load this servlet when
tomcat starts.
In your case the thread's run-method would
just sleep for 10 minutes, then do the work
and go back to sleep.
Ari S.
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Re: [Half-OT] Background apps in webapp ?
Posted by 奕东 方 <fa...@yahoo.com.cn>.
I think that you can write a MDB(Message Driven Bean),which can get initial parameters from ejb-jar.xml,and you can write a standalone app to send message(via jms) to the MDB periodically telling the MDB to check the condition.
yogi-ml@darkmag.net wrote:Hail,
I've to developp a small java app for my webapp ; it must check every 10
mins (for example) some data into my oracle database and react according
to some values (still for example, if a date stored in a field is today,
send a mail to a person).
I thought I may build a standalone app, which would run in background. But
i'd like this app to retrieve data from my webapp's web.xml (as you can do
in servlets/tags/snippets with getInitParameter())
Is there a technology which allow such things ? Or should i try to "force"
the parsing of the web.xml file while completely ignoring the webapp &
Tomcat's features ? Or, do you have other ideas ? :)
Thx a lot,
Yogi
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