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package com
import (
"sync"
"sync/atomic"
)
// Counter implements an atomic counter.
type Counter struct {
value uint64
mu sync.Mutex // Protects total.
total uint64
}
// Add adds the given delta to the counter.
func (c *Counter) Add(delta uint64) {
atomic.AddUint64(&c.value, delta)
}
// Inc increments the counter by one.
func (c *Counter) Inc() {
c.Add(1)
}
// Reset resets the counter to 0 and returns its previous value.
// Does not reset the total value returned from Total.
func (c *Counter) Reset() uint64 {
c.mu.Lock()
defer c.mu.Unlock()
v := atomic.SwapUint64(&c.value, 0)
c.total += v
return v
}
// Total returns the total counter value.
func (c *Counter) Total() uint64 {
c.mu.Lock()
defer c.mu.Unlock()
return c.total + c.Val()
}
// Val returns the current counter value.
func (c *Counter) Val() uint64 {
return atomic.LoadUint64(&c.value)
}
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