org.axonframework.eventsourcing
Interface EventStreamDecorator

All Known Subinterfaces:

SnapshotterTrigger

All Known Implementing Classes:

CompositeEventStreamDecorator, EventCountSnapshotterTrigger

public interface EventStreamDecorator

Interface describing a class that can decorates DomainEventStreams when events for aggregates are read or appended.

Since:

0.7

Author:

Allard Buijze

Method Summary

DomainEventStream	decorateForAppend(String aggregateType, EventSourcedAggregateRoot aggregate, DomainEventStream eventStream) Called when an event stream is appended to the event store.
DomainEventStream	decorateForRead(String aggregateType, Object aggregateIdentifier, DomainEventStream eventStream) Called when an event stream is read from the event store.

Method Detail

decorateForRead

DomainEventStream decorateForRead(String aggregateType,
                                  Object aggregateIdentifier,
                                  DomainEventStream eventStream)

Called when an event stream is read from the event store.

Note that a stream is read-once, similar to InputStream. If you read from the stream, make sure to store the read events and pass them to the chain. Usually, it is best to decorate the given eventStream and pass that to the chain.

Parameters:

aggregateType - The type of aggregate events are being read for

aggregateIdentifier - The identifier of the aggregate events are loaded for

eventStream - The eventStream containing the events to append to the event store

Returns:

the decorated event stream

decorateForAppend

DomainEventStream decorateForAppend(String aggregateType,
                                    EventSourcedAggregateRoot aggregate,
                                    DomainEventStream eventStream)

Called when an event stream is appended to the event store.

Note that a stream is read-once, similar to InputStream. If you read from the stream, make sure to store the read events and pass them to the chain. Usually, it is best to decorate the given eventStream and pass that to the chain.

Parameters:

aggregateType - The type of aggregate events are being appended for

aggregate - The aggregate for which the events are being stored

eventStream - The eventStream containing the events to append to the event store

Returns:

the decorated event stream