/
inmemory.go
64 lines (51 loc) · 1.28 KB
/
inmemory.go
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package eventstore
import (
"context"
"errors"
"sync"
"github.com/ThreeDotsLabs/esja"
)
type InMemoryStore[T esja.Entity[T]] struct {
lock sync.RWMutex
events map[string][]esja.VersionedEvent[T]
}
func NewInMemoryStore[T esja.Entity[T]]() *InMemoryStore[T] {
return &InMemoryStore[T]{
lock: sync.RWMutex{},
events: map[string][]esja.VersionedEvent[T]{},
}
}
func (i *InMemoryStore[T]) Load(_ context.Context, id string) (*T, error) {
i.lock.RLock()
defer i.lock.RUnlock()
events, ok := i.events[id]
if !ok {
return nil, ErrEntityNotFound
}
return esja.NewEntity(id, events)
}
func (i *InMemoryStore[T]) Save(_ context.Context, t *T) error {
i.lock.Lock()
defer i.lock.Unlock()
if t == nil {
return errors.New("target to save must not be nil")
}
stm := *t
events := stm.Stream().PopEvents()
if len(events) == 0 {
return errors.New("no events to save")
}
if priorEvents, ok := i.events[stm.Stream().ID()]; !ok {
i.events[stm.Stream().ID()] = events
} else {
for _, event := range events {
if len(priorEvents) > 0 {
if priorEvents[len(priorEvents)-1].StreamVersion >= event.StreamVersion {
return errors.New("stream version duplicate")
}
}
i.events[stm.Stream().ID()] = append(i.events[stm.Stream().ID()], event)
}
}
return nil
}