org.axonframework.domain
Interface Event

All Superinterfaces:

Serializable

All Known Subinterfaces:

AggregateDeletedEvent

All Known Implementing Classes:

AggregateSnapshot, ApplicationEvent, DomainEvent, EventBase, ScheduledEvent, SystemEvent

public interface Event
extends Serializable

Base interface for all events in the application. All classes that represent an event should implement this interface.

Consider implementing one of the abstract subclasses to categorize events into one of three categories:

• DomainEvent: Events that represent a state change of an aggregate.
• ApplicationEvent: Events that do not represent a state change of an aggregate, but do have an important meaning to the application.
• SystemEvent: Events that represent a state change or notification of a subsystem. These events typically notify the application that part of it is not available.

Since:

0.4

Author:

Allard Buijze

See Also:

DomainEvent, ApplicationEvent, SystemEvent

Method Summary

UUID	getEventIdentifier() Returns the identifier of this event.
EventMetaData	getMetaData() Returns the meta data for this event.
Serializable	getMetaDataValue(String key) Returns the value registered in the meta data under the given key.
org.joda.time.LocalDateTime	getTimestamp() Returns the timestamp of this event.

Method Detail

getEventIdentifier

UUID getEventIdentifier()

Returns the identifier of this event.

Returns:

the identifier of this event.

getTimestamp

org.joda.time.LocalDateTime getTimestamp()

Returns the timestamp of this event. The timestamp is set to the date and time the event was created.

Returns:

the timestamp of this event.

getMetaData

EventMetaData getMetaData()

Returns the meta data for this event. This meta data is a collection of key-value pairs, where the key is a String, and the value is a serializable object.

Returns:

the meta data for this event

getMetaDataValue

Serializable getMetaDataValue(String key)

Returns the value registered in the meta data under the given key. If no value is known for the given key, this method returns null.

Parameters:

key - The key of the meta data entry

Returns:

The value registered under the given key, or null if the key wasn't found