Package org.springframework.scheduling

Interface TaskScheduler

All Known Implementing Classes:
ConcurrentTaskScheduler, DefaultManagedTaskScheduler, ThreadPoolTaskScheduler
public interface TaskScheduler
Task scheduler interface that abstracts the scheduling of Runnables based on different kinds of triggers.

This interface is separate from SchedulingTaskExecutor since it usually represents a different kind of backend, i.e. a thread pool with different characteristics and capabilities. Implementations may implement both interfaces if they can handle both kinds of execution characteristics.

The 'default' implementation is ThreadPoolTaskScheduler, wrapping a native ScheduledExecutorService and adding extended trigger capabilities.

This interface is roughly equivalent to a JSR-236 ManagedScheduledExecutorService as supported in Jakarta EE environments but aligned with Spring's TaskExecutor model.

Since:
3.0
Author:
Juergen Hoeller
See Also:

  • Method Details

    • getClock

      default Clock getClock()
      Return the clock to use for scheduling purposes.
      Since:
      5.3
      See Also:

    • schedule

      @Nullable ScheduledFuture<?> schedule(Runnable task, Trigger trigger)
      Schedule the given Runnable, invoking it whenever the trigger indicates a next execution time.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      trigger - an implementation of the Trigger interface, e.g. a CronTrigger object wrapping a cron expression
      Returns:
      a ScheduledFuture representing pending completion of the task, or null if the given Trigger object never fires (i.e. returns null from Trigger.nextExecutionTime(org.springframework.scheduling.TriggerContext))
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)
      See Also:

    • schedule

      ScheduledFuture<?> schedule(Runnable task, Instant startTime)
      Schedule the given Runnable, invoking it at the specified execution time.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      startTime - the desired execution time for the task (if this is in the past, the task will be executed immediately, i.e. as soon as possible)
      Returns:
      a ScheduledFuture representing pending completion of the task
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)
      Since:
      5.0

    • schedule

      @Deprecated(since="6.0") default ScheduledFuture<?> schedule(Runnable task, Date startTime)
      Deprecated.
      as of 6.0, in favor of schedule(Runnable, Instant)
      Schedule the given Runnable, invoking it at the specified execution time.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      startTime - the desired execution time for the task (if this is in the past, the task will be executed immediately, i.e. as soon as possible)
      Returns:
      a ScheduledFuture representing pending completion of the task
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)

    • scheduleAtFixedRate

      ScheduledFuture<?> scheduleAtFixedRate(Runnable task, Instant startTime, Duration period)
      Schedule the given Runnable, invoking it at the specified execution time and subsequently with the given period.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      startTime - the desired first execution time for the task (if this is in the past, the task will be executed immediately, i.e. as soon as possible)
      period - the interval between successive executions of the task
      Returns:
      a ScheduledFuture representing pending completion of the task
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)
      Since:
      5.0

    • scheduleAtFixedRate

      @Deprecated(since="6.0") default ScheduledFuture<?> scheduleAtFixedRate(Runnable task, Date startTime, long period)
      Deprecated.
      as of 6.0, in favor of scheduleAtFixedRate(Runnable, Instant, Duration)
      Schedule the given Runnable, invoking it at the specified execution time and subsequently with the given period.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      startTime - the desired first execution time for the task (if this is in the past, the task will be executed immediately, i.e. as soon as possible)
      period - the interval between successive executions of the task (in milliseconds)
      Returns:
      a ScheduledFuture representing pending completion of the task
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)

    • scheduleAtFixedRate

      ScheduledFuture<?> scheduleAtFixedRate(Runnable task, Duration period)
      Schedule the given Runnable, starting as soon as possible and invoking it with the given period.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      period - the interval between successive executions of the task
      Returns:
      a ScheduledFuture representing pending completion of the task
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)
      Since:
      5.0

    • scheduleAtFixedRate

      @Deprecated(since="6.0") default ScheduledFuture<?> scheduleAtFixedRate(Runnable task, long period)
      Deprecated.
      as of 6.0, in favor of scheduleAtFixedRate(Runnable, Duration)
      Schedule the given Runnable, starting as soon as possible and invoking it with the given period.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      period - the interval between successive executions of the task (in milliseconds)
      Returns:
      a ScheduledFuture representing pending completion of the task
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)

    • scheduleWithFixedDelay

      ScheduledFuture<?> scheduleWithFixedDelay(Runnable task, Instant startTime, Duration delay)
      Schedule the given Runnable, invoking it at the specified execution time and subsequently with the given delay between the completion of one execution and the start of the next.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      startTime - the desired first execution time for the task (if this is in the past, the task will be executed immediately, i.e. as soon as possible)
      delay - the delay between the completion of one execution and the start of the next
      Returns:
      a ScheduledFuture representing pending completion of the task
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)
      Since:
      5.0

    • scheduleWithFixedDelay

      @Deprecated(since="6.0") default ScheduledFuture<?> scheduleWithFixedDelay(Runnable task, Date startTime, long delay)
      Deprecated.
      as of 6.0, in favor of scheduleWithFixedDelay(Runnable, Instant, Duration)
      Schedule the given Runnable, invoking it at the specified execution time and subsequently with the given delay between the completion of one execution and the start of the next.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      startTime - the desired first execution time for the task (if this is in the past, the task will be executed immediately, i.e. as soon as possible)
      delay - the delay between the completion of one execution and the start of the next (in milliseconds)
      Returns:
      a ScheduledFuture representing pending completion of the task
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)

    • scheduleWithFixedDelay

      ScheduledFuture<?> scheduleWithFixedDelay(Runnable task, Duration delay)
      Schedule the given Runnable, starting as soon as possible and invoking it with the given delay between the completion of one execution and the start of the next.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      delay - the delay between the completion of one execution and the start of the next
      Returns:
      a ScheduledFuture representing pending completion of the task
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)
      Since:
      5.0

    • scheduleWithFixedDelay

      @Deprecated(since="6.0") default ScheduledFuture<?> scheduleWithFixedDelay(Runnable task, long delay)
      Deprecated.
      as of 6.0, in favor of scheduleWithFixedDelay(Runnable, Duration)
      Schedule the given Runnable, starting as soon as possible and invoking it with the given delay between the completion of one execution and the start of the next.

      Execution will end once the scheduler shuts down or the returned ScheduledFuture gets cancelled.

      Parameters:
      task - the Runnable to execute whenever the trigger fires
      delay - the delay between the completion of one execution and the start of the next (in milliseconds)
      Returns:
      a ScheduledFuture representing pending completion of the task
      Throws:
      TaskRejectedException - if the given task was not accepted for internal reasons (e.g. a pool overload handling policy or a pool shutdown in progress)