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package metrics
import (
"fmt"
"io"
"sync/atomic"
)
// NewCounter registers and returns new counter with the given name.
//
// name must be valid Prometheus-compatible metric with possible labels.
// For instance,
//
// - foo
// - foo{bar="baz"}
// - foo{bar="baz",aaa="b"}
//
// The returned counter is safe to use from concurrent goroutines.
func NewCounter(name string) *Counter {
return defaultSet.NewCounter(name)
}
// Counter is a counter.
//
// It may be used as a gauge if Dec and Set are called.
type Counter struct {
n uint64
}
// Inc increments c.
func (c *Counter) Inc() {
atomic.AddUint64(&c.n, 1)
}
// Dec decrements c.
func (c *Counter) Dec() {
atomic.AddUint64(&c.n, ^uint64(0))
}
// Add adds n to c.
func (c *Counter) Add(n int) {
atomic.AddUint64(&c.n, uint64(n))
}
// AddInt64 adds n to c.
func (c *Counter) AddInt64(n int64) {
atomic.AddUint64(&c.n, uint64(n))
}
// Get returns the current value for c.
func (c *Counter) Get() uint64 {
return atomic.LoadUint64(&c.n)
}
// Set sets c value to n.
func (c *Counter) Set(n uint64) {
atomic.StoreUint64(&c.n, n)
}
// marshalTo marshals c with the given prefix to w.
func (c *Counter) marshalTo(prefix string, w io.Writer) {
v := c.Get()
fmt.Fprintf(w, "%s %d\n", prefix, v)
}
func (c *Counter) metricType() string {
return "counter"
}
// GetOrCreateCounter returns registered counter with the given name
// or creates new counter if the registry doesn't contain counter with
// the given name.
//
// name must be valid Prometheus-compatible metric with possible labels.
// For instance,
//
// - foo
// - foo{bar="baz"}
// - foo{bar="baz",aaa="b"}
//
// The returned counter is safe to use from concurrent goroutines.
//
// Performance tip: prefer NewCounter instead of GetOrCreateCounter.
func GetOrCreateCounter(name string) *Counter {
return defaultSet.GetOrCreateCounter(name)
}
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