cache: sync.Map{}, // [string]operationTimestamp {}
	}
}

// AddIfNotExist returns directly if there exists an entry with the key. Otherwise, it
// creates a new operation timestamp using operationName, pluginName, and current timestamp
// and stores the operation timestamp with the key
func (c *OperationStartTimeCache) AddIfNotExist(key, pluginName, operationName string) {
	ts := newOperationTimestamp(pluginName, operationName)

		// create a start timestamp entry in cache for deletion operation if no one exists with
		// key = volume.Name, pluginName = provisionerName, operation = "delete"
		ctrl.operationTimestamps.AddIfNotExist(volume.Name, ctrl.getProvisionerNameFromVolume(volume), "delete")
		ctrl.scheduleOperation(logger, opName, func() error {
			_, err := ctrl.deleteVolumeOperation(ctx, volume)
			if err != nil {