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# Which Problems Are Solved Float64 which was used for the event.Position field is [not precise in go and gets rounded](https://github.com/golang/go/issues/47300). This can lead to unprecies position tracking of events and therefore projections especially on cockcoachdb as the position used there is a big number. example of a unprecies position: exact: 1725257931223002628 float64: 1725257931223002624.000000 # How the Problems Are Solved The float64 was replaced by [github.com/jackc/pgx-shopspring-decimal](https://github.com/jackc/pgx-shopspring-decimal). # Additional Changes Correct behaviour of makefile for load tests. Rename `latestSequence`-queries to `latestPosition`
56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
package eventstore
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import (
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"time"
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"github.com/shopspring/decimal"
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)
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// ReadModel is the minimum representation of a read model.
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// It implements a basic reducer
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// it might be saved in a database or in memory
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type ReadModel struct {
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AggregateID string `json:"-"`
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ProcessedSequence uint64 `json:"-"`
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CreationDate time.Time `json:"-"`
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ChangeDate time.Time `json:"-"`
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Events []Event `json:"-"`
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ResourceOwner string `json:"-"`
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InstanceID string `json:"-"`
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Position decimal.Decimal `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) {
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rm.Events = append(rm.Events, events...)
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}
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// Reduce is the basic implementation of reducer
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// If this function is extended the extending function should be the last step
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func (rm *ReadModel) Reduce() error {
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if len(rm.Events) == 0 {
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return nil
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}
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if rm.AggregateID == "" {
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rm.AggregateID = rm.Events[0].Aggregate().ID
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}
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if rm.ResourceOwner == "" {
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rm.ResourceOwner = rm.Events[0].Aggregate().ResourceOwner
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}
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if rm.InstanceID == "" {
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rm.InstanceID = rm.Events[0].Aggregate().InstanceID
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}
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if rm.CreationDate.IsZero() {
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rm.CreationDate = rm.Events[0].CreatedAt()
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}
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rm.ChangeDate = rm.Events[len(rm.Events)-1].CreatedAt()
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rm.ProcessedSequence = rm.Events[len(rm.Events)-1].Sequence()
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rm.Position = rm.Events[len(rm.Events)-1].Position()
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// all events processed and not needed anymore
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rm.Events = rm.Events[0:0]
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return nil
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}
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