Scheduling and Checking a Java Programme.

[singh gaurav]

Hi EveryBody,

I have to create two class A, and class B.

1. class A have some methods executed sequentialy within an infinite loop,

2.class B have some logic to check Class A programme is running or not in every 2 minutes, if class A programme is not running then start it,

please suggest me a way to implement both class A & class B.

In abstract
>> How can i check class A is running or not?
>> How can i start class A execution from Class B ?
>> How can i schedule running of Class B application in every 2 mins in a windows environment?
>> How can i implement a infinte java loop ,with out stack over flow.

Hope for your complete reply

Thanks
Gaurav
[e-mail]

[Stephan van Hulst]

Take a look at java.util.Timer and java.util.concurrent.ExecutorService.

Honestly, there are often better ways than polling a process every so often. Instead, why don't you wait for the process to notify you of when it's done?

[singh gaurav]

Actually , it is a real time system,
the first class have a infinite loop and continuously executed some method , second class is only care taker of first class and their is no other relation ship like parent -child (inheritance),

So second class (Class B) only ensure that Class A loop and methods are in execution, when class get crashed or its execution stops class B restart Class A.

I also have to ensure that Class A have only one process running ,
no further process is created of class A in any condition.

[Stephan van Hulst]

Yes, so what's forcing you to poll the process? Why can't you be notified? You need to be more specific in your requirements.