Class Scheduler

  • All Implemented Interfaces:
    Runnable

    public class Scheduler
    extends Thread
    A simple but still useful implementation of a Scheduler (in memory only).

    This implementation will work very well when the number of scheduled job is small, say less than 100 jobs. If a larger number of events need to be scheduled, than a better adapted data structure for the jobList can give improved performance.
    Author:
    Ceki
    • Constructor Detail

      • Scheduler

        public Scheduler()
        Create new instance.
    • Method Detail

      • delete

        public boolean delete​(Job job)
        Delete the given job.
        Parameters:
        job - job.
        Returns:
        true if the job could be deleted, and false if the job could not be found or if the Scheduler is about to shutdown in which case deletions are not permitted.
      • schedule

        public void schedule​(Job job,
                             long desiredTime)
        Schedule a Job for execution at system time given by the desiredTime parameter.
        Parameters:
        job - job to schedule.
        desiredTime - desired time of execution.
      • schedule

        public void schedule​(Job job,
                             long desiredTime,
                             long period)
        Schedule a Job for execution at system time given by the desiredTime parameter.

        The job will be rescheduled. It will execute with a frequency determined by the period parameter.
        Parameters:
        job - job to schedule.
        desiredTime - desired time of execution.
        period - repeat period.
      • changePeriod

        public boolean changePeriod​(Job job,
                                    long newPeriod)
        Change the period of a job. The original job must exist for its period to be changed.

        The method returns true if the period could be changed, and false otherwise.
        Parameters:
        job - job.
        newPeriod - new repeat period.
        Returns:
        true if period could be changed.
      • shutdown

        public void shutdown()
        Shut down scheduler.
      • run

        public void run()
        Run scheduler.
        Specified by:
        run in interface Runnable
        Overrides:
        run in class Thread