ExtensionCommandController.php

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<?php
namespace TYPO3\CMS\Extensionmanager\Command;

use TYPO3\CMS\Extbase\Mvc\Controller\CommandController;

class ExtensionCommandController extends CommandController {

    protected $requestAdminPermissions = TRUE;

    protected $signalSlotDispatcher;

    public function installCommand($extensionKey) {
        $this->emitPackagesMayHaveChangedSignal();

        $service = $this->objectManager->get('TYPO3\\CMS\\Extensionmanager\\Utility\\InstallUtility');
        $service->install($extensionKey);
    }

    public function uninstallCommand($extensionKey) {
        $service = $this->objectManager->get('TYPO3\\CMS\\Extensionmanager\\Utility\\InstallUtility');
        $service->uninstall($extensionKey);
    }

    protected function emitPackagesMayHaveChangedSignal() {
        $this->signalSlotDispatcher->dispatch('PackageManagement', 'packagesMayHaveChanged');
    }
}