util/check-once.go

package util

import "sync"

// CheckOnce struct
type CheckOnce struct {
	mutex sync.Mutex
	done  bool
}

// IsDone func
func (c *CheckOnce) IsDone() bool {
	c.mutex.Lock()
	defer c.mutex.Unlock()

	return c.done
}

// Done func
func (c *CheckOnce) Done(f func()) {
	c.mutex.Lock()
	defer c.mutex.Unlock()

	if !c.done {
		f()
		c.done = true
	}
}