69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
// Copyright 2020 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package metrics
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import (
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"math"
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"unsafe"
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)
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// ValueKind is a tag for a metric Value which indicates its type.
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type ValueKind int
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const (
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// KindBad indicates that the Value has no type and should not be used.
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KindBad ValueKind = iota
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// KindUint64 indicates that the type of the Value is a uint64.
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KindUint64
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// KindFloat64 indicates that the type of the Value is a float64.
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KindFloat64
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// KindFloat64Histogram indicates that the type of the Value is a *Float64Histogram.
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KindFloat64Histogram
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)
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// Value represents a metric value returned by the runtime.
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type Value struct {
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kind ValueKind
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scalar uint64 // contains scalar values for scalar Kinds.
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pointer unsafe.Pointer // contains non-scalar values.
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}
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// Kind returns the tag representing the kind of value this is.
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func (v Value) Kind() ValueKind {
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return v.kind
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}
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// Uint64 returns the internal uint64 value for the metric.
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//
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// If v.Kind() != KindUint64, this method panics.
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func (v Value) Uint64() uint64 {
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if v.kind != KindUint64 {
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panic("called Uint64 on non-uint64 metric value")
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}
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return v.scalar
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}
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// Float64 returns the internal float64 value for the metric.
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//
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// If v.Kind() != KindFloat64, this method panics.
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func (v Value) Float64() float64 {
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if v.kind != KindFloat64 {
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panic("called Float64 on non-float64 metric value")
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}
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return math.Float64frombits(v.scalar)
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}
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// Float64Histogram returns the internal *Float64Histogram value for the metric.
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//
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// If v.Kind() != KindFloat64Histogram, this method panics.
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func (v Value) Float64Histogram() *Float64Histogram {
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if v.kind != KindFloat64Histogram {
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panic("called Float64Histogram on non-Float64Histogram metric value")
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}
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return (*Float64Histogram)(v.pointer)
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}
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