zitadel/internal/eventstore/v2/read_model.go

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package eventstore
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import "time"
func NewReadModel(id string) *ReadModel {
return &ReadModel{
ID: id,
Events: []Event{},
}
}
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//ReadModel is the minimum representation of a View model.
// it might be saved in a database or in memory
type ReadModel struct {
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ProcessedSequence uint64 `json:"-"`
ID string `json:"-"`
CreationDate time.Time `json:"-"`
ChangeDate time.Time `json:"-"`
Events []Event `json:"-"`
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}
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//AppendEvents adds all the events to the read model.
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// The function doesn't compute the new state of the read model
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func (rm *ReadModel) AppendEvents(events ...Event) *ReadModel {
rm.Events = append(rm.Events, events...)
return rm
}
//Reduce must be the last step in the reduce function of the extension
func (rm *ReadModel) Reduce() error {
if len(rm.Events) == 0 {
return nil
}
if rm.CreationDate.IsZero() {
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rm.CreationDate = rm.Events[0].Base().creationDate
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}
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rm.ChangeDate = rm.Events[len(rm.Events)-1].Base().creationDate
rm.ProcessedSequence = rm.Events[len(rm.Events)-1].Base().sequence
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// all events processed and not needed anymore
rm.Events = nil
rm.Events = []Event{}
return nil
}
func NewAggregate(id string) *Aggregate {
return &Aggregate{
ID: id,
Events: []Event{},
}
}
type Aggregate struct {
PreviousSequence uint64 `json:"-"`
ID string `json:"-"`
Events []Event `json:"-"`
}
//AppendEvents adds all the events to the aggregate.
// The function doesn't compute the new state of the aggregate
func (a *Aggregate) AppendEvents(events ...Event) *Aggregate {
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a.Events = append(a.Events, events...)
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return a
}
//Reduce must be the last step in the reduce function of the extension
func (a *Aggregate) Reduce() error {
if len(a.Events) == 0 {
return nil
}
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a.PreviousSequence = a.Events[len(a.Events)-1].Base().sequence
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// all events processed and not needed anymore
a.Events = nil
a.Events = []Event{}
return nil
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}