package actor

// Dispatcher chooses where a mailbox's entire drain task executes. Schedule
// may run the task inline or asynchronously. It must accept every task, execute
// it exactly once eventually, and must not reject, silently discard, or panic.
// Schedule must be safe for concurrent calls when shared by actors. The actor
// does not provide a fallback for a dispatcher that violates this contract.
type Dispatcher interface {
	Schedule(task func())
}

// DispatcherFunc adapts a scheduling function to Dispatcher. A nil function is
// rejected by New when supplied through WithDispatcher.
type DispatcherFunc func(task func())

// Schedule delegates to f. The function must satisfy the Dispatcher contract.
func (f DispatcherFunc) Schedule(task func()) {
	f(task)
}

type inlineDispatcher struct{}

func (inlineDispatcher) Schedule(task func()) {
	task()
}