Package org.axonframework.eventhandling.scheduling.java

Class SimpleEventScheduler

java.lang.Object

org.axonframework.eventhandling.scheduling.java.SimpleEventScheduler

All Implemented Interfaces:

EventScheduler, Lifecycle

public class SimpleEventScheduler
extends Object
implements EventScheduler, Lifecycle

An EventScheduler implementation that uses Java's ScheduledExecutorService as scheduling and triggering mechanism.

Note that this mechanism is non-persistent. Scheduled tasks will be lost when the JVM is shut down, unless special measures have been taken to prevent that. For more flexible and powerful scheduling options, see QuartzEventScheduler.

Since:

0.7

Author:

Allard Buijze

See Also:

• QuartzEventScheduler

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	SimpleEventScheduler.Builder	Builder class to instantiate a SimpleEventScheduler.

Nested classes/interfaces inherited from interface org.axonframework.lifecycle.Lifecycle

Lifecycle.LifecycleHandler, Lifecycle.LifecycleRegistry

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	SimpleEventScheduler(SimpleEventScheduler.Builder builder)	Instantiate a SimpleEventScheduler based on the fields contained in the SimpleEventScheduler.Builder.

Method Summary

Modifier and Type	Method	Description
static SimpleEventScheduler.Builder	builder()	Instantiate a Builder to be able to create a SimpleEventScheduler.
void	cancelSchedule(ScheduleToken scheduleToken)	Cancel the publication of a scheduled event.
void	registerLifecycleHandlers(Lifecycle.LifecycleRegistry lifecycle)	Registers the activities to be executed in the various phases of an application's lifecycle.
ScheduleToken	schedule(Duration triggerDuration, Object event)	Schedule the given event for publication after the given triggerDuration.
ScheduleToken	schedule(Instant triggerDateTime, Object event)	Schedule the given event for publication at the given triggerDateTime.
void	shutdown()	Shuts down this event scheduler.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.axonframework.eventhandling.scheduling.EventScheduler

reschedule, reschedule

Constructor Details

SimpleEventScheduler

protected SimpleEventScheduler(SimpleEventScheduler.Builder builder)

Instantiate a SimpleEventScheduler based on the fields contained in the SimpleEventScheduler.Builder.

Will assert that the ScheduledExecutorService, EventBus and TransactionManager are not null, and will throw an AxonConfigurationException if any of them is null.

Parameters:

builder - the SimpleEventScheduler.Builder used to instantiate a SimpleEventScheduler instance

Method Details

builder

public static SimpleEventScheduler.Builder builder()

Instantiate a Builder to be able to create a SimpleEventScheduler.

The TransactionManager is defaulted to a NoTransactionManager. The ScheduledExecutorService and EventBus are a hard requirements and as such should be provided.

Returns:

a Builder to be able to create a SimpleEventScheduler

schedule

public ScheduleToken schedule(Instant triggerDateTime,
 Object event)

Description copied from interface: EventScheduler

Schedule the given event for publication at the given triggerDateTime. The returned ScheduleToken can be used to cancel the planned publication.

The given event may be any object, as well as an EventMessage. In the latter case, the instance provided is the donor for the payload and Meta Data of the actual message being dispatched. In the former case, the given event will be wrapped as the payload of an EventMessage.

Specified by:

schedule in interface EventScheduler

Parameters:

triggerDateTime - The moment to trigger publication of the event

event - The event to publish

Returns:

the token to use when cancelling the schedule

schedule

public ScheduleToken schedule(Duration triggerDuration,
 Object event)

Description copied from interface: EventScheduler

Schedule the given event for publication after the given triggerDuration. The returned ScheduleToken can be used to cancel the planned publication.

The given event may be any object, as well as an EventMessage. In the latter case, the instance provided is the donor for the payload and Meta Data of the actual message being dispatched. In the former case, the given event will be wrapped as the payload of an EventMessage.

Specified by:

schedule in interface EventScheduler

Parameters:

triggerDuration - The amount of time to wait before publishing the event

event - The event to publish

Returns:

the token to use when cancelling the schedule

cancelSchedule

public void cancelSchedule(ScheduleToken scheduleToken)

Description copied from interface: EventScheduler

Cancel the publication of a scheduled event. If the events has already been published, this method does nothing.

Specified by:

cancelSchedule in interface EventScheduler

Parameters:

scheduleToken - the token returned when the event was scheduled

registerLifecycleHandlers

public void registerLifecycleHandlers(@Nonnull
 Lifecycle.LifecycleRegistry lifecycle)

Description copied from interface: Lifecycle

Registers the activities to be executed in the various phases of an application's lifecycle. This could either be at startup, shutdown, or both.

Specified by:

registerLifecycleHandlers in interface Lifecycle

Parameters:

lifecycle - the lifecycle instance to register the handlers with

See Also:

• Lifecycle.LifecycleRegistry.onShutdown(int, Runnable)
• Lifecycle.LifecycleRegistry.onShutdown(int, LifecycleHandler)
• Lifecycle.LifecycleRegistry.onStart(int, Runnable)
• Lifecycle.LifecycleRegistry.onStart(int, LifecycleHandler)

shutdown

public void shutdown()

Description copied from interface: EventScheduler

Shuts down this event scheduler.

Specified by:

shutdown in interface EventScheduler