EJB @Schedule wait until method completed

Question

I want to write a back-ground job (EJB 3.1), which executes every minute. For this I use the following annotation:

@Schedule(minute = \"*/1\", hour = \"*\")
         


        

Answer 1

well I had a similar problem. There was a job that was supposed to run every 30 minutes and sometimes the job was taking more than 30 minutes to complete in this case another instance of job was starting while previous one was not yet finished. I solved it by having a static boolean variable which my job would set to true whenever it started run and then set it back to false whenever it finished. Since its a static variable all instances will see the same copy at all times. You could even synchronize the block when u set and unset the static variable. class myjob{ private static boolean isRunning=false;

public executeJob(){
if (isRunning)
    return;
isRunning=true;
//execute job
isRunning=false;
  }

}