pool

type FuncAdd func(metric libmet.Metric) error

type FuncGet func(name string) libmet.Metric

type FuncSet func(key string, metric libmet.Metric)

type FuncWalk func(pool MetricPool, key string, val libmet.Metric) bool

type MetricPool interface {
	// Get is used to retrieve the metric instance from the pool.
	Get(name string) libmet.Metric

	// Add is used to register the metric instance into the pool.
	Add(metric libmet.Metric) error

	// Set is used to replace the metric instance into the pool.
	Set(key string, metric libmet.Metric)

	// Del is used to remove the metric instance into the pool.
	Del(key string)

	// List retrieve a slice of metrics' name registered into the pool.
	List() []string

	// Walk run the given function for each stored item into the pool.
	// If the function return false, the process is stopped.
	Walk(fct FuncWalk, limit ...string) bool
}