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48 lines
1.6 KiB
Go
48 lines
1.6 KiB
Go
package eventstore
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import (
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"time"
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)
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// Command is the intend to store an event into the eventstore
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type Command interface {
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//Aggregate is the metadata of an aggregate
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Aggregate() Aggregate
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// EditorService is the service who wants to push the event
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EditorService() string
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//EditorUser is the user who wants to push the event
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EditorUser() string
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//KeyType must return an event type which should be unique in the aggregate
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Type() EventType
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//Data returns the payload of the event. It represent the changed fields by the event
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// valid types are:
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// * nil (no payload),
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// * json byte array
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// * struct which can be marshalled to json
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// * pointer to struct which can be marshalled to json
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Data() interface{}
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//UniqueConstraints should be added for unique attributes of an event, if nil constraints will not be checked
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UniqueConstraints() []*EventUniqueConstraint
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}
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// Event is a stored activity
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type Event interface {
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// EditorService is the service who pushed the event
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EditorService() string
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//EditorUser is the user who pushed the event
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EditorUser() string
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//KeyType is the type of the event
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Type() EventType
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Aggregate() Aggregate
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Sequence() uint64
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CreationDate() time.Time
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//PreviousAggregateSequence returns the previous sequence of the aggregate root (e.g. for org.42508134)
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PreviousAggregateSequence() uint64
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//PreviousAggregateTypeSequence returns the previous sequence of the aggregate type (e.g. for org)
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PreviousAggregateTypeSequence() uint64
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//DataAsBytes returns the payload of the event. It represent the changed fields by the event
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DataAsBytes() []byte
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}
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