Re: [Springframework-developer] Spring scheduler?

[Ivan R. <iv...@we...>]

jürgen höller [werk3AT] wrote:
> On related terms, I'll work on J2EE integration for SBB's UC4
 > job scheduling system in October. There is definitely a lot of
> overlap here, and the big plus that SBB have agreed to define common
> parts and interfaces as open source project a la AOP Alliance. Generic
> interfaces and definitions for implementing jobs, and implementations
> for UC4 via JCA/JMS and for Spring in a bean factory style... sounds
> interesting to me :-) Additionally, SBB have good relations with SAP
> and the makers of Flux, so there should be plenty of feedback and
> chances for future developments.

   That's very good news. As far as I am concerned we can wait for
   that, especially since I moved my scheduler-related project
   for early next year.

   However, I did put some work toward this since our last email
   exchange and would like to proceed (slowly, as you can see)
   with it:

   I have reviewed Quartz and, now that I've invested time to learn
   how it works, I have no real desire to create a new scheduling
   library. I still find it too complex, though, but nothing is
   perfect. Therefore I am proposing what someone else proposed
   before, to create a simple Quartz wrapper.

   I also looked at the J2EE timer service and found it too
   simplistic. There is an interesting article on the subject:

   http://www2.theserverside.com/resources/article.jsp?l=MonsonHaefel-Column4

   I've tried to create a very simple (as simple as it can be) scheduling
   wrapper and this is what I've come up with:

-------------------------

public interface Scheduler {
     // schedule is cron-like scheduling formula
     public int createTask(String schedule, Runnable runnable);
     public boolean removeTask(int taskid);
}

public class SpringSchedulerHelper implements Scheduler {
     public int createTask(String schedule, String bean);
     public int createTask(String schedule, String bean, String method);
     public int createTask(String schedule, String bean, String method, 
String[] args);

     // these two are not specific to Spring, actually	
     public int createTask(String schedule, Object instance, Method m);
     public int createTask(String schedule, Object instance, Method m, 
Object[] args);
	
     public int createTask(String schedule, ApplicationEvent event);

     // perhaps more createTask methods here

     // scheduler implementation set at runtime
     public void setScheduler(Scheduler scheduler);
     public void getScheduler();
}

public class SpringTaskWrapper implements Runnable {
     // todo ...
}

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