io.micronaut.scheduling

Interface TaskScheduler

All Known Implementing Classes:

ScheduledExecutorTaskScheduler

public interface TaskScheduler

Interface for Scheduling tasks.

Since:

1.0

Author:

graemerocher

Method Summary

Modifier and Type	Method and Description
<V> ScheduledFuture<V>	schedule(Duration delay, Callable<V> callable) Creates and executes a ScheduledFuture that becomes enabled after the given delay.
ScheduledFuture<?>	schedule(Duration delay, Runnable command) Creates and executes a one-shot action that becomes enabled after the given delay.
<V> ScheduledFuture<V>	schedule(String cron, Callable<V> command) Creates and executes a one-shot action that becomes enabled after the given delay.
ScheduledFuture<?>	schedule(String cron, Runnable command) Creates and executes a one-shot action that becomes enabled after the given delay.
ScheduledFuture<?>	scheduleAtFixedRate(Duration initialDelay, Duration period, Runnable command) Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given period; that is executions will commence after initialDelay then initialDelay+period, then initialDelay + 2 * period, and so on.
ScheduledFuture<?>	scheduleWithFixedDelay(Duration initialDelay, Duration delay, Runnable command) Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given delay between the termination of one execution and the commencement of the next.

Method Detail

schedule

ScheduledFuture<?> schedule(String cron,
                            Runnable command)

Creates and executes a one-shot action that becomes enabled after the given delay.

Parameters:

cron - The cron expression

command - the task to execute

Returns:

a ScheduledFuture representing pending completion of the task and whose get() method will return null upon completion

Throws:

RejectedExecutionException - if the task cannot be scheduled for execution

NullPointerException - if command or delay is null

schedule

<V> ScheduledFuture<V> schedule(String cron,
                                Callable<V> command)

Creates and executes a one-shot action that becomes enabled after the given delay.

Type Parameters:

V - The type of the callable's result

Parameters:

cron - The cron expression

command - The task to execute

Returns:

a ScheduledFuture representing pending completion of the task and whose get() method will return null upon completion

Throws:

RejectedExecutionException - if the task cannot be scheduled for execution

NullPointerException - if command or delay is null

schedule

ScheduledFuture<?> schedule(Duration delay,
                            Runnable command)

Creates and executes a one-shot action that becomes enabled after the given delay.

Parameters:

delay - the time from now to delay execution

command - the task to execute

Returns:

a ScheduledFuture representing pending completion of the task and whose get() method will return null upon completion

Throws:

RejectedExecutionException - if the task cannot be scheduled for execution

NullPointerException - if command or delay is null

schedule

<V> ScheduledFuture<V> schedule(Duration delay,
                                Callable<V> callable)

Creates and executes a ScheduledFuture that becomes enabled after the given delay.

Type Parameters:

V - The type of the callable's result

Parameters:

delay - The time from now to delay execution

callable - The function to execute

Returns:

a ScheduledFuture that can be used to extract result or cancel

Throws:

RejectedExecutionException - if the task cannot be scheduled for execution

NullPointerException - if callable or delay is null

scheduleAtFixedRate

ScheduledFuture<?> scheduleAtFixedRate(@Nullable
                                       Duration initialDelay,
                                       Duration period,
                                       Runnable command)

Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given period; that is executions will commence after initialDelay then initialDelay+period, then initialDelay + 2 * period, and so on. If any execution of the task encounters an exception, subsequent executions are suppressed. Otherwise, the task will only terminate via cancellation or termination of the executor. If any execution of this task takes longer than its period, then subsequent executions may start late, but will not concurrently execute.

Parameters:

initialDelay - the time to delay first execution

period - the period between successive executions

command - the task to execute

Returns:

a ScheduledFuture representing pending completion of the task, and whose get() method will throw an exception upon cancellation

Throws:

RejectedExecutionException - if the task cannot be scheduled for execution

NullPointerException - if command or period is null

IllegalArgumentException - if period less than or equal to zero

scheduleWithFixedDelay

ScheduledFuture<?> scheduleWithFixedDelay(@Nullable
                                          Duration initialDelay,
                                          Duration delay,
                                          Runnable command)

Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given delay between the termination of one execution and the commencement of the next. If any execution of the task encounters an exception, subsequent executions are suppressed. Otherwise, the task will only terminate via cancellation or termination of the executor.

Parameters:

initialDelay - the time to delay first execution

delay - the delay between the termination of one

command - the task to execute execution and the commencement of the next

Returns:

a ScheduledFuture representing pending completion of the task, and whose get() method will throw an exception upon cancellation

Throws:

RejectedExecutionException - if the task cannot be scheduled for execution

NullPointerException - if command or delay is null

IllegalArgumentException - if delay less than or equal to zero