Piwik\Columns\Updater::onNoUpdateAvailable PHP Method

    public function onNoUpdateAvailable($versionsThatWereChecked)
    {
        if (!empty($versionsThatWereChecked)) {
            // invalidate cache only if there were actually file changes before, otherwise we write the cache on each
            // request. There were versions checked only if there was a file change but no update, meaning we can
            // set the cache and declare this state as "no update available".
            self::cacheCurrentDimensionFileChanges();
        }
    }

 /**
  * Returns any updates that should occur for core and all plugins that are both loaded and
  * installed. Also includes updates required for dimensions.
  *
  * @return string[]|null Returns the result of `getComponentsWithUpdateFile()`.
  */
 public function getComponentUpdates()
 {
     $componentsToCheck = array('core' => Version::VERSION);
     $manager = \Piwik\Plugin\Manager::getInstance();
     $plugins = $manager->getLoadedPlugins();
     foreach ($plugins as $pluginName => $plugin) {
         if ($manager->isPluginInstalled($pluginName)) {
             $componentsToCheck[$pluginName] = $plugin->getVersion();
         }
     }
     $columnsVersions = $this->columnsUpdater->getAllVersions($this);
     foreach ($columnsVersions as $component => $version) {
         $componentsToCheck[$component] = $version;
     }
     $componentsWithUpdateFile = $this->getComponentsWithUpdateFile($componentsToCheck);
     if (count($componentsWithUpdateFile) == 0) {
         $this->columnsUpdater->onNoUpdateAvailable($columnsVersions);
         if (!$this->hasNewVersion('core')) {
             return null;
         }
     }
     return $componentsWithUpdateFile;
 }