package common

// Closable is the interface for objects that can release its resources.
type Closable interface {
	// Close release all resources used by this object, including goroutines.
	Close() error
}

// Close closes the obj if it is a Closable.
func Close(obj interface{}) error {
	if c, ok := obj.(Closable); ok {
		return c.Close()
	}
	return nil
}

// Runnable is the interface for objects that can start to work and stop on demand.
type Runnable interface {
	// Start starts the runnable object. Upon the method returning nil, the object begins to function properly.
	Start() error

	Closable
}