The fast food store has 8 processors (cashiers/cooks). While the concurrent burgers store might have had only 2 (one cashier and one cook).

But still, the final experience is not the best. 😞

---

This would be the parallel equivalent story for burgers. 🍔

For a more "real life" example of this, imagine a bank.

	return
}

// replayItems - Reads the items from the store and replays.
func replayItems[I any](store Store[I], doneCh <-chan struct{}, log logger, id string) <-chan Key {
	keyCh := make(chan Key)

	go func() {
		defer xioutil.SafeClose(keyCh)

		retryTicker := time.NewTicker(retryInterval)
		defer retryTicker.Stop()

		for {
			for _, key := range store.List() {
				select {
				case keyCh <- key:

func (store *IAMStoreSys) ListGroups(ctx context.Context) (res []string, err error) {
	cache := store.lock()
	defer store.unlock()

	return store.updateGroups(ctx, cache)
}

// listGroups - lists groups - fetch groups from cache
func (store *IAMStoreSys) listGroups(ctx context.Context) (res []string, err error) {
	cache := store.rlock()
	defer store.runlock()

		logger.Info("IAM expired STS purge took %.2fs", took)
	}

	// Store the newly populated map in the iam cache. This takes care of
	// removing stale entries from the existing map.
	cache.iamSTSAccountsMap = stsAccountsFromStore

	stsAccPoliciesFromStore.Range(func(k string, v MappedPolicy) bool {
		cache.iamSTSPolicyMap.Store(k, v)
		return true
	})

	return nil
}

			return nil, fmt.Errorf("unable to initialize the queue store of NSQ `%s`: %w", id, err)
		}
	}

	target := &NSQTarget{
		id:         event.TargetID{ID: id, Name: "nsq"},
		args:       args,
		loggerOnce: loggerOnce,
		store:      queueStore,
		quitCh:     make(chan struct{}),
	}

	if target.store != nil {
		store.StreamItems(target.store, target, target.quitCh, target.loggerOnce)
	}

	return
}

// Del - Deletes an entry from the store.
func (store *QueueStore[_]) Del(key Key) error {
	store.Lock()
	defer store.Unlock()
	return store.del(key)
}

// Len returns the entry count.
func (store *QueueStore[_]) Len() int {
	store.RLock()
	l := len(store.entries)
	defer store.RUnlock()
	return l
}

// lockless call
func (store *QueueStore[_]) del(key Key) error {

	}
	// Put 10 items
	for i := 0; i < 10; i++ {
		if _, err := store.Put(testItem); err != nil {
			t.Fatal("Failed to put to queue store ", err)
		}
	}
	itemKeys := store.List()
	// Get 10 items.
	if len(itemKeys) == 10 {
		for _, key := range itemKeys {
			item, eErr := store.Get(key)
			if eErr != nil {
				t.Fatal("Failed to Get the item from the queue store ", eErr)
			}

	}

	// Delete the event from store.
	return target.store.Del(key)
}

// Save - saves the events to the store if queuestore is configured, which will
// be replayed when the mqtt connection is active.
func (target *MQTTTarget) Save(eventData event.Event) error {
	if target.store != nil {
		_, err := target.store.Put(eventData)
		return err
	}
	if err := target.init(); err != nil {
		return err
	}

// Name - returns the Name of the target.
func (target *MySQLTarget) Name() string {
	return target.ID().String()
}

// Store returns any underlying store if set.
func (target *MySQLTarget) Store() event.TargetStore {
	return target.store
}

// IsActive - Return true if target is up and active
func (target *MySQLTarget) IsActive() (bool, error) {
	if err := target.init(); err != nil {
		return false, err
	}

type BatchConfig[I any] struct {
	Limit         uint32
	Store         Store[I]
	CommitTimeout time.Duration
	Log           logger
}

// Add adds the item to the batch
func (b *Batch[I]) Add(item I) error {
	b.Lock()
	defer b.Unlock()

	if b.isFull() {
		if b.store == nil {
			return ErrBatchFull
		}
		// commit batch to store
		if err := b.commit(); err != nil {
			return err
		}
	}