Masterminds / glide

import (

	"sync"

)

// UpdateTracker holds a list of all the packages that have been updated from

// an external source. This is a concurrency safe implementation.

type UpdateTracker struct {

	sync.RWMutex

	updated map[string]bool

}

// NewUpdateTracker creates a new instance of UpdateTracker ready for use.

// Add adds a name to the list of items being tracked.

func (u *UpdateTracker) Add(name string) {

	u.Lock()

	u.updated[name] = true

	u.Unlock()

}

// Check returns if an item is on the list or not.

func (u *UpdateTracker) Check(name string) bool {

	u.RLock()

	_, f := u.updated[name]

	u.RUnlock()

	return f

}

// Remove takes a package off the list

func (u *UpdateTracker) Remove(name string) {

	u.Lock()

	delete(u.updated, name)

	u.Unlock()

}