"sync"
)

// This file provides abstractions for setting the provider (e.g., prometheus)
// of metrics.

type leaderMetricsAdapter interface {
	leaderOn(name string)
	leaderOff(name string)
}

// GaugeMetric represents a single numerical value that can arbitrarily go up
// and down.
type SwitchMetric interface {
	On(name string)
	Off(name string)
}

type noopMetric struct{}

func (noopMetric) On(name string)  {}

	Inc()
	Dec()
	Clear()
}

var _ MetricRecorder = &PendingPodsRecorder{}

// PendingPodsRecorder is an implementation of MetricRecorder
type PendingPodsRecorder struct {
	recorder metrics.GaugeMetric
}

// NewActivePodsRecorder returns ActivePods in a Prometheus metric fashion
func NewActivePodsRecorder() *PendingPodsRecorder {
	return &PendingPodsRecorder{
		recorder: ActivePods(),
	}
}