Package org.axonframework.eventsourcing

Class AbstractSnapshotTrigger

java.lang.Object

org.axonframework.eventsourcing.AbstractSnapshotTrigger

All Implemented Interfaces:

Serializable, SnapshotTrigger

public abstract class AbstractSnapshotTrigger
extends Object
implements SnapshotTrigger, Serializable

Abstract implementation of the SnapshotTrigger that schedules snapshots on the Unit of Work. Actual logic when to schedule a snapshot should be provided by a subclass.

Since:

4.4.4

Author:

Yvonne Ceelie

See Also:

• Serialized Form

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractSnapshotTrigger(Snapshotter snapshotter, Class<?> aggregateType)	Instantiate a AbstractSnapshotTrigger based on the Snapshotter and aggregateType Class<?>.

Method Summary

Modifier and Type	Method	Description
void	eventHandled(EventMessage<?> msg)	Invoked when an event is handled by an aggregate.
protected abstract boolean	exceedsThreshold()	This method is used to determine if a new snapshot should be created
void	initializationFinished()	Invoked when the initialization of the aggregate based on passed events is completed.
protected abstract void	reset()	This method is used to reset all the variables that are used to check if a threshold has been exceeded
void	setSnapshotter(Snapshotter snapshotter)	Sets the snapshotter

Methods inherited from class java.lang.Object

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

Constructor Details

AbstractSnapshotTrigger

protected AbstractSnapshotTrigger(Snapshotter snapshotter,
 Class<?> aggregateType)

Instantiate a AbstractSnapshotTrigger based on the Snapshotter and aggregateType Class<?>.

Parameters:

snapshotter - the Snapshotter for scheduling snapshots

aggregateType - the of the aggregate that is creating a snapshot

Method Details

eventHandled

public void eventHandled(@Nonnull
 EventMessage<?> msg)

Description copied from interface: SnapshotTrigger

Invoked when an event is handled by an aggregate. While these messages usually extend DomainEventMessage, this is not guaranteed. The given message can either be a historic Message from the Event Store, or one that has been just applied by the aggregate.

Specified by:

eventHandled in interface SnapshotTrigger

Parameters:

msg - The message handled by the aggregate

initializationFinished

public void initializationFinished()

Description copied from interface: SnapshotTrigger

Invoked when the initialization of the aggregate based on passed events is completed. Any subsequent invocation of SnapshotTrigger.eventHandled(EventMessage) involves an event being applied on "current state".

Specified by:

initializationFinished in interface SnapshotTrigger

setSnapshotter

public void setSnapshotter(Snapshotter snapshotter)

Sets the snapshotter

Parameters:

snapshotter - The Snapshotter for scheduling snapshots.

exceedsThreshold

protected abstract boolean exceedsThreshold()

This method is used to determine if a new snapshot should be created

Returns:

true if the threshold has been exceeded

reset

protected abstract void reset()

This method is used to reset all the variables that are used to check if a threshold has been exceeded