// 创建或更新聚合，并持久化到事件存储中
// isCreateAction：是否为创建操作
// store：事件存储
// id：聚合标识
// state：聚合状态
// agg：聚合
// action：创建或更新聚合的操作
func CreateOrUpdateAggregate(isCreateAction bool, store es.EventStore, id domain.AggregateIdentity, state domain.AggregateState, agg domain.Aggregate, action func(agg domain.Aggregate) error) {
stream := store.LoadEventStream(id)
state.Init(stream.Events)
if isCreateAction {
if stream.StreamVersion > 0 {
panic(fmt.Sprintf("Aggregate '%s' is already exists!", domain.AggIdToStr(id)))
}
} else {
if stream.StreamVersion <= 0 {
panic(fmt.Sprintf("Aggregate '%s' is not exists!", domain.AggIdToStr(id)))
} else if state.Version() < 0 {
panic(fmt.Sprintf("Aggregate '%s' is deleted, couldn't use it!", domain.AggIdToStr(id)))
}
}
agg.Init(state)
if err := action(agg); err != nil {
panic(err.Error())
}
streamExpectedVersion := stream.StreamVersion
if streamExpectedVersion < 0 {
streamExpectedVersion = 0
}
if err := store.AppendEventsToStream(id, streamExpectedVersion, agg.Changes()); err != nil {
panic(err.Error())
}
}
func (self *OptimisticConcurrencyError) Error() string {
message := fmt.Sprintf("OptimisticConcurrencyError: Expected v%d but found v%d in stream '%s'", self.ExpectedVersion, self.ActualVersion, domain.AggIdToStr(self.Id))
return message
}