51 lines
1.3 KiB
Go
51 lines
1.3 KiB
Go
package metrics
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import (
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"math"
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"sync/atomic"
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)
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// GetOrRegisterGaugeFloat64 returns an existing GaugeFloat64 or constructs and registers a
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// new GaugeFloat64.
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func GetOrRegisterGaugeFloat64(name string, r Registry) *GaugeFloat64 {
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if nil == r {
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r = DefaultRegistry
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}
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return r.GetOrRegister(name, NewGaugeFloat64()).(*GaugeFloat64)
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}
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// GaugeFloat64Snapshot is a read-only copy of a GaugeFloat64.
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type GaugeFloat64Snapshot float64
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// Value returns the value at the time the snapshot was taken.
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func (g GaugeFloat64Snapshot) Value() float64 { return float64(g) }
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// NewGaugeFloat64 constructs a new GaugeFloat64.
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func NewGaugeFloat64() *GaugeFloat64 {
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return new(GaugeFloat64)
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}
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// NewRegisteredGaugeFloat64 constructs and registers a new GaugeFloat64.
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func NewRegisteredGaugeFloat64(name string, r Registry) *GaugeFloat64 {
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c := NewGaugeFloat64()
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if nil == r {
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r = DefaultRegistry
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}
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r.Register(name, c)
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return c
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}
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// GaugeFloat64 hold a float64 value that can be set arbitrarily.
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type GaugeFloat64 atomic.Uint64
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// Snapshot returns a read-only copy of the gauge.
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func (g *GaugeFloat64) Snapshot() GaugeFloat64Snapshot {
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v := math.Float64frombits((*atomic.Uint64)(g).Load())
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return GaugeFloat64Snapshot(v)
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}
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// Update updates the gauge's value.
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func (g *GaugeFloat64) Update(v float64) {
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(*atomic.Uint64)(g).Store(math.Float64bits(v))
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}
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