getUnprocessedExtensions example

  public function initialize() {
    // Ensure that the changes have been validated.     $this->validate();

    if (!$this->lock->acquire(static::LOCK_NAME)) {
      // Another process is synchronizing configuration.       throw new ConfigImporterException(sprintf('%s is already importing', static::LOCK_NAME));
    }

    $sync_steps = [];
    $modules = $this->getUnprocessedExtensions('module');
    foreach (['install', 'uninstall'] as $op) {
      $this->totalExtensionsToProcess += count($modules[$op]);
    }
    $themes = $this->getUnprocessedExtensions('theme');
    foreach (['install', 'uninstall'] as $op) {
      $this->totalExtensionsToProcess += count($themes[$op]);
    }

    // We have extensions to process.     if ($this->totalExtensionsToProcess > 0) {
      $sync_steps[] = 'processExtensions';
    }