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aggregate_repository.go
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aggregate_repository.go
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package goengine
import (
"fmt"
)
type AggregateRepository interface {
Load(string, StreamName) (*EventStream, error)
Save(AggregateRoot, StreamName) error
Reconstitute(string, AggregateRoot, StreamName) error
}
type PublisherRepository struct {
EventStore EventStore
EventBus VersionedEventPublisher
}
func NewPublisherRepository(eventStore EventStore, eventBus VersionedEventPublisher) *PublisherRepository {
return &PublisherRepository{eventStore, eventBus}
}
func (r *PublisherRepository) Load(id string, streamName StreamName) (*EventStream, error) {
Log("Loading events from stream for aggregate", map[string]interface{}{"stream": streamName, "id": id}, nil)
stream, err := r.EventStore.GetEventsFor(streamName, id)
if nil != err {
return nil, err
}
return stream, nil
}
func (r *PublisherRepository) Save(aggregateRoot AggregateRoot, streamName StreamName) error {
events := aggregateRoot.GetUncommittedEvents()
eventStream := NewEventStream(streamName, events)
Log("Saving events to stream", map[string]interface{}{"count": len(events), "stream": streamName}, nil)
err := r.EventStore.Append(eventStream)
if nil != err {
return err
}
if nil == r.EventBus {
Log("Event bus not detected, skipping publishing events", nil, nil)
return nil
}
if err = r.EventBus.PublishEvents(events); err != nil {
return err
}
return nil
}
func (r *PublisherRepository) Reconstitute(id string, source AggregateRoot, streamName StreamName) error {
Log("Reconstituting aggregate from stream", map[string]interface{}{"stream": streamName, "id": id}, nil)
stream, err := r.Load(id, streamName)
if nil != err {
return err
}
events := stream.Events
if len(events) == 0 {
return fmt.Errorf("No events found for id: %s", id)
}
for _, event := range events {
source.Apply(event.Payload)
}
source.SetVersion(events[len(events)-1].Version)
Log("Aggregate reconstituted", map[string]interface{}{"id": id}, nil)
return nil
}