caller

type Caller interface {
	// Do runs executable functions base on given Config.
	// The key will combine with prefixKey if any.
	// 	CompleteFlow: "GetCache" -> "Singleflight" -> "Breaker" -> "WorkFn" -> "SetCache".
	Do(key string, timeout time.Duration, workFn func() (interface{}, error), nextFn NextFn) (resp interface{}, err error)
	// contains filtered or unexported methods
}

type Config struct {
	// PrefixKey represents prefix key of this session
	// and mandatory if using Cache / Singleflight
	// else optional.
	PrefixKey string

	// Cache store data in memory
	// in a way depending on their method.
	Cache cache.Cache

	// Singleflight make duplicate caller
	// flight in one execution.
	Singleflight singleflight.Singleflight

	// Breaker do go/no-go call to WorkFn
	// under certain threshold.
	Breaker breaker.Breaker
}

type NextFn struct {
	SuccessFn  func() // runs if workFn got success.
	FailFn     func() // runs if workFn got fail.
	TimeoutFn  func() // runs if workFn got timeout.
	BreakerFn  func() // runs if IsErrBerakerOpen=true.
	GetCacheFn func() // runs if GetCache got success.
	SetCacheFn func() // runs if SetCache got success.
}