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37 lines
634 B
37 lines
634 B
6 years ago
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package metric
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import (
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"fmt"
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"sync/atomic"
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)
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var _ Metric = &counter{}
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// Counter stores a numerical value that only ever goes up.
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type Counter interface {
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Metric
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}
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// CounterOpts is an alias of Opts.
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type CounterOpts Opts
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type counter struct {
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val int64
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}
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// NewCounter creates a new Counter based on the CounterOpts.
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func NewCounter(opts CounterOpts) Counter {
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return &counter{}
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}
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func (c *counter) Add(val int64) {
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if val < 0 {
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panic(fmt.Errorf("stat/metric: cannot decrease in negative value. val: %d", val))
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}
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atomic.AddInt64(&c.val, val)
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}
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func (c *counter) Value() int64 {
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return atomic.LoadInt64(&c.val)
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}
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