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37 lines
668 B
37 lines
668 B
package metric
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import "sync/atomic"
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var _ Metric = &gauge{}
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// Gauge stores a numerical value that can be add arbitrarily.
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type Gauge interface {
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Metric
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// Sets sets the value to the given number.
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Set(int64)
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}
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// GaugeOpts is an alias of Opts.
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type GaugeOpts Opts
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type gauge struct {
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val int64
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}
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// NewGauge creates a new Gauge based on the GaugeOpts.
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func NewGauge(opts GaugeOpts) Gauge {
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return &gauge{}
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}
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func (g *gauge) Add(val int64) {
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atomic.AddInt64(&g.val, val)
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}
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func (g *gauge) Set(val int64) {
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old := atomic.LoadInt64(&g.val)
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atomic.CompareAndSwapInt64(&g.val, old, val)
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}
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func (g *gauge) Value() int64 {
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return atomic.LoadInt64(&g.val)
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}
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