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package gobacktest
import (
// MetricHandler defines the handling of metrics to a data event
type MetricHandler interface {
Add(string, float64) error
Get(string) (float64, bool)
// Metric holds metric propertys to a data point.
type Metric map[string]float64
// Add ads a value to the metrics map
func (m Metric) Add(key string, value float64) error {
if m == nil {
m = make(map[string]float64)
if key == "" {
return errors.New("invalid key given")
m[key] = value
return nil
// Get return a metric by name, if not found it returns false.
func (m Metric) Get(key string) (float64, bool) {
value, ok := m[key]
return value, ok
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