core

type BaseMeasure interface {
	Name() string
	Description() string
	Unit() unit.Unit

	DefinitionID() EventID
}

type EventID uint64

type Key interface {
	BaseMeasure

	Value(ctx context.Context) KeyValue

	Bool(v bool) KeyValue

	Int(v int) KeyValue
	Int32(v int32) KeyValue
	Int64(v int64) KeyValue

	Uint(v uint) KeyValue
	Uint32(v uint32) KeyValue
	Uint64(v uint64) KeyValue

	Float32(v float32) KeyValue
	Float64(v float64) KeyValue

	String(v string) KeyValue
	Bytes(v []byte) KeyValue
}

type KeyValue struct {
	Key   Key
	Value Value
}

type Measure interface {
	BaseMeasure

	M(float64) Measurement
	V(float64) KeyValue
}

type MeasureMetadata struct {
	MaxHops int // -1 == infinite, 0 == do not propagate

}

type Measurement struct {
	// NOTE: If we add a ScopeID field this can carry
	// pre-aggregated measures via the stats.Record API.
	Measure Measure
	Value   float64
	ScopeID ScopeID
}

type Mutator struct {
	MutatorOp
	KeyValue
	MeasureMetadata
}

type MutatorOp int

type ScopeID struct {
	EventID
	SpanContext
}

type SpanContext struct {
	TraceIDHigh uint64
	TraceIDLow  uint64
	SpanID      uint64
}

type Value struct {
	Type    ValueType
	Bool    bool
	Int64   int64
	Uint64  uint64
	Float64 float64
	String  string
	Bytes   []byte
}

type ValueType int