Piwik\Plugins\Marketplace\Plugins\InvalidLicenses::getPluginNamesOfInvalidLicenses PHP Method

    public function getPluginNamesOfInvalidLicenses()
    {
        // it is very important this is cached, otherwise performance may decrease a lot. Eager cache is currently
        // cached for 12 hours. In case we lower ttl for eager cache it might be worth considering to change to another
        // cache
        if ($this->cache->contains($this->cacheKey)) {
            $expiredPlugins = $this->cache->fetch($this->cacheKey);
        } else {
            $expiredPlugins = $this->getPluginNamesToExpireInCaseLicenseIsInvalid();
            $this->cache->save($this->cacheKey, $expiredPlugins);
        }
        return $expiredPlugins;
    }