[VOL-1386] This commit add "dep" as the package management tool
for voltha-go.
Change-Id: I52bc4911dd00a441756ec7c30f46d45091f3f90e
diff --git a/vendor/github.com/rcrowley/go-metrics/meter.go b/vendor/github.com/rcrowley/go-metrics/meter.go
new file mode 100644
index 0000000..223669b
--- /dev/null
+++ b/vendor/github.com/rcrowley/go-metrics/meter.go
@@ -0,0 +1,251 @@
+package metrics
+
+import (
+ "math"
+ "sync"
+ "sync/atomic"
+ "time"
+)
+
+// Meters count events to produce exponentially-weighted moving average rates
+// at one-, five-, and fifteen-minutes and a mean rate.
+type Meter interface {
+ Count() int64
+ Mark(int64)
+ Rate1() float64
+ Rate5() float64
+ Rate15() float64
+ RateMean() float64
+ Snapshot() Meter
+ Stop()
+}
+
+// GetOrRegisterMeter returns an existing Meter or constructs and registers a
+// new StandardMeter.
+// Be sure to unregister the meter from the registry once it is of no use to
+// allow for garbage collection.
+func GetOrRegisterMeter(name string, r Registry) Meter {
+ if nil == r {
+ r = DefaultRegistry
+ }
+ return r.GetOrRegister(name, NewMeter).(Meter)
+}
+
+// NewMeter constructs a new StandardMeter and launches a goroutine.
+// Be sure to call Stop() once the meter is of no use to allow for garbage collection.
+func NewMeter() Meter {
+ if UseNilMetrics {
+ return NilMeter{}
+ }
+ m := newStandardMeter()
+ arbiter.Lock()
+ defer arbiter.Unlock()
+ arbiter.meters[m] = struct{}{}
+ if !arbiter.started {
+ arbiter.started = true
+ go arbiter.tick()
+ }
+ return m
+}
+
+// NewMeter constructs and registers a new StandardMeter and launches a
+// goroutine.
+// Be sure to unregister the meter from the registry once it is of no use to
+// allow for garbage collection.
+func NewRegisteredMeter(name string, r Registry) Meter {
+ c := NewMeter()
+ if nil == r {
+ r = DefaultRegistry
+ }
+ r.Register(name, c)
+ return c
+}
+
+// MeterSnapshot is a read-only copy of another Meter.
+type MeterSnapshot struct {
+ count int64
+ rate1, rate5, rate15, rateMean uint64
+}
+
+// Count returns the count of events at the time the snapshot was taken.
+func (m *MeterSnapshot) Count() int64 { return m.count }
+
+// Mark panics.
+func (*MeterSnapshot) Mark(n int64) {
+ panic("Mark called on a MeterSnapshot")
+}
+
+// Rate1 returns the one-minute moving average rate of events per second at the
+// time the snapshot was taken.
+func (m *MeterSnapshot) Rate1() float64 { return math.Float64frombits(m.rate1) }
+
+// Rate5 returns the five-minute moving average rate of events per second at
+// the time the snapshot was taken.
+func (m *MeterSnapshot) Rate5() float64 { return math.Float64frombits(m.rate5) }
+
+// Rate15 returns the fifteen-minute moving average rate of events per second
+// at the time the snapshot was taken.
+func (m *MeterSnapshot) Rate15() float64 { return math.Float64frombits(m.rate15) }
+
+// RateMean returns the meter's mean rate of events per second at the time the
+// snapshot was taken.
+func (m *MeterSnapshot) RateMean() float64 { return math.Float64frombits(m.rateMean) }
+
+// Snapshot returns the snapshot.
+func (m *MeterSnapshot) Snapshot() Meter { return m }
+
+// Stop is a no-op.
+func (m *MeterSnapshot) Stop() {}
+
+// NilMeter is a no-op Meter.
+type NilMeter struct{}
+
+// Count is a no-op.
+func (NilMeter) Count() int64 { return 0 }
+
+// Mark is a no-op.
+func (NilMeter) Mark(n int64) {}
+
+// Rate1 is a no-op.
+func (NilMeter) Rate1() float64 { return 0.0 }
+
+// Rate5 is a no-op.
+func (NilMeter) Rate5() float64 { return 0.0 }
+
+// Rate15is a no-op.
+func (NilMeter) Rate15() float64 { return 0.0 }
+
+// RateMean is a no-op.
+func (NilMeter) RateMean() float64 { return 0.0 }
+
+// Snapshot is a no-op.
+func (NilMeter) Snapshot() Meter { return NilMeter{} }
+
+// Stop is a no-op.
+func (NilMeter) Stop() {}
+
+// StandardMeter is the standard implementation of a Meter.
+type StandardMeter struct {
+ snapshot *MeterSnapshot
+ a1, a5, a15 EWMA
+ startTime time.Time
+ stopped uint32
+}
+
+func newStandardMeter() *StandardMeter {
+ return &StandardMeter{
+ snapshot: &MeterSnapshot{},
+ a1: NewEWMA1(),
+ a5: NewEWMA5(),
+ a15: NewEWMA15(),
+ startTime: time.Now(),
+ }
+}
+
+// Stop stops the meter, Mark() will be a no-op if you use it after being stopped.
+func (m *StandardMeter) Stop() {
+ if atomic.CompareAndSwapUint32(&m.stopped, 0, 1) {
+ arbiter.Lock()
+ delete(arbiter.meters, m)
+ arbiter.Unlock()
+ }
+}
+
+// Count returns the number of events recorded.
+func (m *StandardMeter) Count() int64 {
+ return atomic.LoadInt64(&m.snapshot.count)
+}
+
+// Mark records the occurance of n events.
+func (m *StandardMeter) Mark(n int64) {
+ if atomic.LoadUint32(&m.stopped) == 1 {
+ return
+ }
+
+ atomic.AddInt64(&m.snapshot.count, n)
+
+ m.a1.Update(n)
+ m.a5.Update(n)
+ m.a15.Update(n)
+ m.updateSnapshot()
+}
+
+// Rate1 returns the one-minute moving average rate of events per second.
+func (m *StandardMeter) Rate1() float64 {
+ return math.Float64frombits(atomic.LoadUint64(&m.snapshot.rate1))
+}
+
+// Rate5 returns the five-minute moving average rate of events per second.
+func (m *StandardMeter) Rate5() float64 {
+ return math.Float64frombits(atomic.LoadUint64(&m.snapshot.rate5))
+}
+
+// Rate15 returns the fifteen-minute moving average rate of events per second.
+func (m *StandardMeter) Rate15() float64 {
+ return math.Float64frombits(atomic.LoadUint64(&m.snapshot.rate15))
+}
+
+// RateMean returns the meter's mean rate of events per second.
+func (m *StandardMeter) RateMean() float64 {
+ return math.Float64frombits(atomic.LoadUint64(&m.snapshot.rateMean))
+}
+
+// Snapshot returns a read-only copy of the meter.
+func (m *StandardMeter) Snapshot() Meter {
+ copiedSnapshot := MeterSnapshot{
+ count: atomic.LoadInt64(&m.snapshot.count),
+ rate1: atomic.LoadUint64(&m.snapshot.rate1),
+ rate5: atomic.LoadUint64(&m.snapshot.rate5),
+ rate15: atomic.LoadUint64(&m.snapshot.rate15),
+ rateMean: atomic.LoadUint64(&m.snapshot.rateMean),
+ }
+ return &copiedSnapshot
+}
+
+func (m *StandardMeter) updateSnapshot() {
+ rate1 := math.Float64bits(m.a1.Rate())
+ rate5 := math.Float64bits(m.a5.Rate())
+ rate15 := math.Float64bits(m.a15.Rate())
+ rateMean := math.Float64bits(float64(m.Count()) / time.Since(m.startTime).Seconds())
+
+ atomic.StoreUint64(&m.snapshot.rate1, rate1)
+ atomic.StoreUint64(&m.snapshot.rate5, rate5)
+ atomic.StoreUint64(&m.snapshot.rate15, rate15)
+ atomic.StoreUint64(&m.snapshot.rateMean, rateMean)
+}
+
+func (m *StandardMeter) tick() {
+ m.a1.Tick()
+ m.a5.Tick()
+ m.a15.Tick()
+ m.updateSnapshot()
+}
+
+// meterArbiter ticks meters every 5s from a single goroutine.
+// meters are references in a set for future stopping.
+type meterArbiter struct {
+ sync.RWMutex
+ started bool
+ meters map[*StandardMeter]struct{}
+ ticker *time.Ticker
+}
+
+var arbiter = meterArbiter{ticker: time.NewTicker(5e9), meters: make(map[*StandardMeter]struct{})}
+
+// Ticks meters on the scheduled interval
+func (ma *meterArbiter) tick() {
+ for {
+ select {
+ case <-ma.ticker.C:
+ ma.tickMeters()
+ }
+ }
+}
+
+func (ma *meterArbiter) tickMeters() {
+ ma.RLock()
+ defer ma.RUnlock()
+ for meter := range ma.meters {
+ meter.tick()
+ }
+}