/typo3/sysext/scheduler/mod1/index.php

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<?php
/***************************************************************
*  Copyright notice
*
*  (c) 2009-2010 Francois Suter <francois@typo3.org>
*  (c) 2005 Christian Jul Jensen <julle@typo3.org>
*  All rights reserved
*
*  This script is part of the TYPO3 project. The TYPO3 project is
*  free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  The GNU General Public License can be found at
*  http://www.gnu.org/copyleft/gpl.html.
*
*  This script is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  This copyright notice MUST APPEAR in all copies of the script!
***************************************************************/

require_once (t3lib_extMgm::extPath('scheduler') . 'interfaces/interface.tx_scheduler_additionalfieldprovider.php');

$LANG->includeLLFile('EXT:scheduler/mod1/locallang.xml');
$BE_USER->modAccess($MCONF, 1); // This checks permissions and exits if the users has no permission for entry.

/**
 * Module 'TYPO3 Scheduler administration module' for the 'scheduler' extension.
 *
 * @author		Francois Suter <francois@typo3.org>
 * @author		Christian Jul Jensen <julle@typo3.org>
 * @author		Ingo Renner <ingo@typo3.org>
 * @package		TYPO3
 * @subpackage	tx_scheduler
 * @version		$Id$
 */
class tx_scheduler_Module extends t3lib_SCbase {

	/**
	 * Back path to typo3 main dir
	 *
	 * @var	string		$backPath
	 */
	public $backPath;

	/**
	 * Array containing submitted data when editing or adding a task
	 *
	 * @var	array		$submittedData
	 */
	protected $submittedData = array();

	/**
	 * Array containing all messages issued by the application logic
	 * Contains the error's severity and the message itself
	 *
	 * @var	array	$messages
	 */
	protected $messages = array();

	/**
	 * @var	string	Key of the CSH file
	 */
	protected $cshKey;

	/**
	 *
	 * @var	tx_scheduler	Local scheduler instance
	 */
	protected $scheduler;

	/**
	 * Constructor
	 *
	 * @return	void
	 */
	public function __construct() {
		$this->backPath = $GLOBALS['BACK_PATH'];
			// Set key for CSH
		$this->cshKey = '_MOD_' . $GLOBALS['MCONF']['name'];
	}

	/**
	 * Initializes the backend module
	 *
	 * @return	void
	 */
	public function init() {
		parent::init();

			// Initialize document
		$this->doc = t3lib_div::makeInstance('template');
		$this->doc->setModuleTemplate(t3lib_extMgm::extPath('scheduler') . 'mod1/mod_template.html');
		$this->doc->getPageRenderer()->addCssFile(t3lib_extMgm::extRelPath('scheduler') . 'res/tx_scheduler_be.css');
		$this->doc->backPath = $this->backPath;
		$this->doc->bodyTagId = 'typo3-mod-php';
		$this->doc->bodyTagAdditions = 'class="tx_scheduler_mod1"';

			// Create scheduler instance
		$this->scheduler = t3lib_div::makeInstance('tx_scheduler');
	}

	/**
	 * Adds items to the ->MOD_MENU array. Used for the function menu selector.
	 *
	 * @return	void
	 */
	public function menuConfig() {
		$this->MOD_MENU = array(
			'function' => array(
				'scheduler' => $GLOBALS['LANG']->getLL('function.scheduler'),
				'check'     => $GLOBALS['LANG']->getLL('function.check'),
				'info'      => $GLOBALS['LANG']->getLL('function.info'),
			)
		);

		parent::menuConfig();
	}

	/**
	 * Main function of the module. Write the content to $this->content
	 *
	 * @return	void
	 */
	public function main() {
			// Access check!
			// The page will show only if user has admin rights
		if ($GLOBALS['BE_USER']->user['admin']) {

				// Set the form
			$this->doc->form = '<form name="tx_scheduler_form" id="tx_scheduler_form" method="post" action="">';

				// JavaScript for main function menu
			$this->doc->JScode = '
				<script language="javascript" type="text/javascript">
					script_ended = 0;
					function jumpToUrl(URL) {
						document.location = URL;
					}
				</script>
			';

				// Prepare main content
			$this->content  = $this->doc->header(
				$GLOBALS['LANG']->getLL('function.' . $this->MOD_SETTINGS['function'])
			);
			$this->content .= $this->doc->spacer(5);
			$this->content .= $this->getModuleContent();
		} else {
				// If no access, only display the module's title
			$this->content  = $this->doc->header($GLOBALS['LANG']->getLL('title'));
			$this->content .= $this->doc->spacer(5);
		}

			// Place content inside template
		$content  = $this->doc->startPage($GLOBALS['LANG']->getLL('title'));
		$content .= $this->doc->moduleBody(
			array(),
			$this->getDocHeaderButtons(),
			$this->getTemplateMarkers()
		);
		$content .= $this->doc->endPage();

			// Replace content with templated content
		$this->content = $content;
	}

	/**
	 * Generate the module's content
	 *
	 * @return	string	HTML of the module's main content
	 */
	protected function getModuleContent() {
		$content = '';
		$sectionTitle = '';

			// Get submitted data
		$this->submittedData = t3lib_div::_GPmerged('tx_scheduler');

			// If a save command was submitted, handle saving now
		if ($this->CMD == 'save') {
			$previousCMD = t3lib_div::_GP('previousCMD');
				// First check the submitted data
			$result = $this->preprocessData();

				// If result is ok, proceed with saving
			if ($result) {
				$this->saveTask();
					// Unset command, so that default screen gets displayed
				unset($this->CMD);

				// Errors occurred
				// Go back to previous step
			} else {
				$this->CMD = $previousCMD;
			}
		}

			// Handle chosen action
		switch((string)$this->MOD_SETTINGS['function'])	{
			case 'scheduler':
					// Scheduler's main screen
				$content .= $this->executeTasks();

					// Execute chosen action
				switch ($this->CMD) {
					case 'add':
					case 'edit':
						try {
								// Try adding or editing
							$content .= $this->editTask();
							$sectionTitle = $GLOBALS['LANG']->getLL('action.' . $this->CMD);
						} catch (Exception $e) {
								// An exception may happen when the task to
								// edit could not be found. In this case revert
								// to displaying the list of tasks
								// It can also happend when attempting to edit a running task
							$content .= $this->listTasks();
						}
						break;
					case 'delete':
						$this->deleteTask();
						$content .= $this->listTasks();
						break;
					case 'stop':
						$this->stopTask();
						$content .= $this->listTasks();
						break;
					case 'list':
					default:
						$content .= $this->listTasks();
						break;
				}
				break;
			case 'check':
					// Setup check screen
					// TODO: move check to the report module
				$content .= $this->displayCheckScreen();
				break;
			case 'info':
					// Information screen
				$content .= $this->displayInfoScreen();
				break;
		}

			// Wrap the content in a section
		return $this->doc->section($sectionTitle, '<div class="tx_scheduler_mod1">' . $content . '</div>', 0, 1);
	}

	/**
	 * This method actually prints out the module's HTML content
	 *
	 * @return	void
	 */
	public function render() {
		echo $this->content;
	}

	/**
	 * This method checks the status of the '_cli_scheduler' user
	 * It will differentiate between a non-existing user and an existing,
	 * but disabled user (as per enable fields)
	 *
	 * @return	integer		-1	if user doesn't exist
	 *						 0	if user exists, but is disabled
	 *						 1	if user exists and is not disabled
	 */
	protected function checkSchedulerUser() {
		$schedulerUserStatus = -1;
			// Assemble base WHERE clause
		$where = 'username = \'_cli_scheduler\' AND admin = 0' . t3lib_BEfunc::deleteClause('be_users');
			// Check if user exists at all
		$res = $GLOBALS['TYPO3_DB']->exec_SELECTquery(
			'1',
			'be_users',
			$where
		);
		if ($GLOBALS['TYPO3_DB']->sql_fetch_assoc($res)) {
			$schedulerUserStatus = 0;
				// Check if user exists and is enabled
			$res = $GLOBALS['TYPO3_DB']->exec_SELECTquery(
				'1',
				'be_users',
				$where . t3lib_BEfunc::BEenableFields('be_users')
			);
			if ($GLOBALS['TYPO3_DB']->sql_fetch_assoc($res)) {
				$schedulerUserStatus = 1;
			}
		}
		$GLOBALS['TYPO3_DB']->sql_free_result($res);

		return $schedulerUserStatus;
	}

	/**
	 * This method creates the "cli_scheduler" BE user if it doesn't exist
	 *
	 * @return	void
	 */
	protected function createSchedulerUser() {
			// Check _cli_scheduler user status
		$checkUser = $this->checkSchedulerUser();
			// Prepare default message
		$message = $GLOBALS['LANG']->getLL('msg.userExists');
		$severity = t3lib_FlashMessage::WARNING;
			// If the user does not exist, try creating it
		if ($checkUser == -1) {
				// Prepare necessary data for _cli_scheduler user creation
			$password = md5(uniqid('scheduler', true));
			$data = array('be_users' => array('NEW' => array('username' => '_cli_scheduler', 'password' => $password, 'pid' => 0)));
				/**
				 * Create an instance of TCEmain and execute user creation
				 *
				 * @var	t3lib_TCEmain
				 */
			$tcemain = t3lib_div::makeInstance('t3lib_TCEmain');
			$tcemain->stripslashes_values = 0;
			$tcemain->start($data, array());
			$tcemain->process_datamap();
				// Check if a new uid was indeed generated (i.e. a new record was created)
				// (counting TCEmain errors doesn't work as some failures don't report errors)
			$numberOfNewIDs = count($tcemain->substNEWwithIDs);
			if ($numberOfNewIDs == 1) {
				$message = $GLOBALS['LANG']->getLL('msg.userCreated');
				$severity = t3lib_FlashMessage::OK;
			} else {
				$message = $GLOBALS['LANG']->getLL('msg.userNotCreated');
				$severity = t3lib_FlashMessage::ERROR;
			}
		}
		$this->addMessage($message, $severity);
	}

	/**
	 * This method displays the result of a number of checks
	 * on whether the Scheduler is ready to run or running properly
	 *
	 * @return	string	further information
	 */
	protected function displayCheckScreen() {
		$message = '';
		$severity = t3lib_FlashMessage::OK;

			// First, check if cli_sceduler user creation was requested
		if ($this->CMD == 'user') {
			$this->createSchedulerUser();
		}

			// Start generating the content
		$content = $GLOBALS['LANG']->getLL('msg.schedulerSetupCheck');

			// Display information about last automated run, as stored in the system registry
			/**
			 * @var	t3lib_Registry
			 */
		$registry = t3lib_div::makeInstance('t3lib_Registry');
		$lastRun = $registry->get('tx_scheduler', 'lastRun');
		if (!is_array($lastRun)) {
			$message = $GLOBALS['LANG']->getLL('msg.noLastRun');
			$severity = t3lib_FlashMessage::WARNING;
		} else {
			if (empty($lastRun['end']) || empty($lastRun['start']) || empty($lastRun['type'])) {
				$message = $GLOBALS['LANG']->getLL('msg.incompleteLastRun');
				$severity = t3lib_FlashMessage::WARNING;
			} else {
				$startDate = date($GLOBALS['TYPO3_CONF_VARS']['SYS']['ddmmyy'], $lastRun['start']);
				$startTime = date($GLOBALS['TYPO3_CONF_VARS']['SYS']['hhmm'], $lastRun['start']);
				$endDate = date($GLOBALS['TYPO3_CONF_VARS']['SYS']['ddmmyy'], $lastRun['end']);
				$endTime = date($GLOBALS['TYPO3_CONF_VARS']['SYS']['hhmm'], $lastRun['end']);
				$label = 'automatically';
				if ($lastRun['type'] == 'manual') {
					$label = 'manually';
				}
				$type = $GLOBALS['LANG']->getLL('label.' . $label);
				$message = sprintf($GLOBALS['LANG']->getLL('msg.lastRun'), $type, $startDate, $startTime, $endDate, $endTime);
				$severity = t3lib_FlashMessage::INFO;
			}
		}
		$flashMessage = t3lib_div::makeInstance(
			't3lib_FlashMessage',
			$message,
			'',
			$severity
		);
		$content .= '<div class="info-block">';
		$content .= '<h3>' . $GLOBALS['LANG']->getLL('hdg.lastRun') . '</h3>';
		$content .= $flashMessage->render();
		$content .= '</div>';

			// Check CLI user
		$content .= '<div class="info-block">';
		$content .= '<h3>' . $GLOBALS['LANG']->getLL('hdg.schedulerUser') . '</h3>';
		$content .= '<p>' . $GLOBALS['LANG']->getLL('msg.schedulerUser') . '</p>';

		$checkUser = $this->checkSchedulerUser();
		if ($checkUser == -1) {
			$link = $GLOBALS['MCONF']['_'] . '&SET[function]=check&CMD=user';
			$message = sprintf($GLOBALS['LANG']->getLL('msg.schedulerUserMissing'), htmlspecialchars($link));
			$severity = t3lib_FlashMessage::ERROR;
		} elseif ($checkUser == 0) {
			$message = $GLOBALS['LANG']->getLL('msg.schedulerUserFoundButDisabled');
			$severity = t3lib_FlashMessage::WARNING;
		} else {
			$message = $GLOBALS['LANG']->getLL('msg.schedulerUserFound');
			$severity = t3lib_FlashMessage::OK;
		}
		$flashMessage = t3lib_div::makeInstance(
			't3lib_FlashMessage',
			$message,
			'',
			$severity
		);
		$content .= $flashMessage->render() . '</div>';

			// Check if CLI script is executable or not
		$script = PATH_typo3 . 'cli_dispatch.phpsh';
		$isExecutable = FALSE;
			// Skip this check if running Windows, as rights do not work the same way on this platform
			// (i.e. the script will always appear as *not* executable)
		if (TYPO3_OS === 'WIN') {
			$isExecutable = TRUE;
		} else {
			$isExecutable = is_executable($script);
		}
		$content .= '<div class="info-block">';
		$content .= '<h3>' . $GLOBALS['LANG']->getLL('hdg.cliScript') . '</h3>';
		$content .= '<p>' . sprintf($GLOBALS['LANG']->getLL('msg.cliScript'), $script) . '</p>';

		if ($isExecutable) {
			$message = $GLOBALS['LANG']->getLL('msg.cliScriptExecutable');
			$severity = t3lib_FlashMessage::OK;
		} else {
			$message = $GLOBALS['LANG']->getLL('msg.cliScriptNotExecutable');
			$severity = t3lib_FlashMessage::ERROR;
		}
		$flashMessage = t3lib_div::makeInstance(
			't3lib_FlashMessage',
			$message,
			'',
			$severity
		);
		$content .= $flashMessage->render() . '</div>';

		return $content;
	}

	/**
	 * This method gathers information about all available task classes and displays it
	 *
	 * @return	string	HTML content to display
	 */
	protected function displayInfoScreen() {
		$content = '';
		$registeredClasses = self::getRegisteredClasses();

			// No classes available, display information message
		if (count($registeredClasses) == 0) {
				/** @var t3lib_FlashMessage $flashMessage */
			$flashMessage = t3lib_div::makeInstance('t3lib_FlashMessage',
				$GLOBALS['LANG']->getLL('msg.noTasksDefined'),
				'',
				t3lib_FlashMessage::INFO
			);
			$content .= $flashMessage->render();

			// Display the list of all available classes
		} else {
				// Initialise table layout
			$tableLayout = array (
				'table' => array ('<table border="0" cellspacing="1" cellpadding="2" style="width:auto;">', '</table>'),
				'0' => array (
					'tr' => array('<tr class="bgColor2" valign="top">', '</tr>'),
					'defCol' => array('<td class="cell">', '</td>')
				),
				'defRow' => array (
					'tr' => array('<tr class="bgColor3-20">', '</tr>'),
					'defCol' => array('<td class="cell">', '</td>')
				)
			);
			$table = array();
			$tr = 0;

				// Header row
			$table[$tr][] = $GLOBALS['LANG']->getLL('label.name');
			$table[$tr][] = $GLOBALS['LANG']->getLL('label.extension');
			$table[$tr][] = $GLOBALS['LANG']->getLL('label.description');
			$table[$tr][] = '';
			$tr++;

				// Display information about each service
			foreach ($registeredClasses as $class => $classInfo) {
				$table[$tr][] = $classInfo['title'];
				$table[$tr][] = $classInfo['extension'];
				$table[$tr][] = $classInfo['description'];
				$link = $GLOBALS['MCONF']['_'] . '&SET[function]=list&CMD=add&tx_scheduler[class]=' . $class;
				$table[$tr][] = '<a href="' . htmlspecialchars($link) . '" title="' . $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:new', TRUE) . '">' . t3lib_iconWorks::getSpriteIcon('actions-document-new') . '</a>';
				$tr++;
			}

				// Render the table and return it
			$content  = '<div>' . $GLOBALS['LANG']->getLL('msg.infoScreenIntro') . '</div>';
			$content .= $this->doc->spacer(5);
			$content .= $this->doc->table($table, $tableLayout);
		}

		return $content;
	}

	/**
	 * Display the current server's time along with a help text about server time
	 * usage in the Scheduler
	 *
	 * @return	string	HTML to display
	 */
	protected function displayServerTime() {
			// Get the current time, formatted
		$dateFormat = $GLOBALS['TYPO3_CONF_VARS']['SYS']['ddmmyy'] . ' ' . $GLOBALS['TYPO3_CONF_VARS']['SYS']['hhmm'] . ' T (e';
		$now = date($dateFormat) . ', GMT ' . date('P') . ')';
			// Display the help text
		$serverTime  = '<h4>' . $GLOBALS['LANG']->getLL('label.serverTime') . '</h4>';
		$serverTime .= '<p>' . $GLOBALS['LANG']->getLL('msg.serverTimeHelp') . '</p>';
		$serverTime .= '<p>' . sprintf($GLOBALS['LANG']->getLL('msg.serverTime'), $now) . '</p>';
		return $serverTime;
	}

	/**
	 * Delete a task from the execution queue
	 *
	 * @return	void
	 */
	protected function deleteTask() {
		try {
				// Try to fetch the task and delete it
				/**
				 * @var	tx_scheduler_Task
				 */
			$task = $this->scheduler->fetchTask($this->submittedData['uid']);
				// If the task is currently running, it may not be deleted
			if ($task->isExecutionRunning()) {
				$this->addMessage($GLOBALS['LANG']->getLL('msg.maynotDeleteRunningTask'), t3lib_FlashMessage::ERROR);
			} else {
				if ($this->scheduler->removeTask($task)) {
					$this->addMessage($GLOBALS['LANG']->getLL('msg.deleteSuccess'));
				} else {
					$this->addMessage($GLOBALS['LANG']->getLL('msg.deleteError'), t3lib_FlashMessage::ERROR);
				}
			}
		} catch (UnexpectedValueException $e) {
				// The task could not be unserialized properly, simply delete the database record
			$result = $GLOBALS['TYPO3_DB']->exec_DELETEquery('tx_scheduler_task', 'uid = ' . intval($this->submittedData['uid']));
			if ($result) {
				$this->addMessage($GLOBALS['LANG']->getLL('msg.deleteSuccess'));
			} else {
				$this->addMessage($GLOBALS['LANG']->getLL('msg.deleteError'), t3lib_FlashMessage::ERROR);
			}
		} catch (OutOfBoundsException $e) {
				// The task was not found, for some reason
			$this->addMessage(sprintf($GLOBALS['LANG']->getLL('msg.taskNotFound'), $this->submittedData['uid']), t3lib_FlashMessage::ERROR);
		}
	}

 	/**
	 * Clears the registered running executions from the task
	 * Note that this doesn't actually stop the running script. It just unmarks
	 * all executions.
	 * TODO: find a way to really kill the running task
	 *
	 * @return	void
	 */
	protected function stopTask() {
		try {
				// Try to fetch the task and stop it
				/**
				 * @var	tx_scheduler_Task
				 */
			$task = $this->scheduler->fetchTask($this->submittedData['uid']);
			if ($task->isExecutionRunning()) {
				// If the task is indeed currently running, clear marked executions

				$result = $task->unmarkAllExecutions();
				if ($result) {
					$this->addMessage($GLOBALS['LANG']->getLL('msg.stopSuccess'));
				} else {
					$this->addMessage($GLOBALS['LANG']->getLL('msg.stopError'), t3lib_FlashMessage::ERROR);
				}
			} else {
				// The task is not running, nothing to unmark

				$this->addMessage($GLOBALS['LANG']->getLL('msg.maynotStopNonRunningTask'), t3lib_FlashMessage::WARNING);
			}
		} catch (Exception $e) {
				// The task was not found, for some reason
			$this->addMessage(sprintf($GLOBALS['LANG']->getLL('msg.taskNotFound'), $this->submittedData['uid']), t3lib_FlashMessage::ERROR);
		}
	}

	/**
	 * Return a form to add a new task or edit an existing one
	 *
	 * @return	string	HTML form to add or edit a task
	 */
	protected function editTask() {
		$registeredClasses = self::getRegisteredClasses();
		$content = '';
		$taskInfo = array();
		$task = NULL;
		$process = 'edit';

		if ($this->submittedData['uid'] > 0) {
				// If editing, retrieve data for existing task
			try {
				$taskRecord = $this->scheduler->fetchTaskRecord($this->submittedData['uid']);
					// If there's a registered execution, the task should not be edited
				if (!empty($taskRecord['serialized_executions'])) {
					$this->addMessage($GLOBALS['LANG']->getLL('msg.maynotEditRunningTask'), t3lib_FlashMessage::ERROR);
					throw new LogicException('Runnings tasks cannot not be edited', 1251232849);
				}
					// Get the task object
				$task = unserialize($taskRecord['serialized_task_object']);

					// Set some task information
				$class = $taskRecord['classname'];
				$taskInfo['disable'] = $taskRecord['disable'];

					// Check that the task object is valid
				if ($this->scheduler->isValidTaskObject($task)) {
					// The task object is valid, process with fetching current data

					$taskInfo['class'] = $class;

						// Get execution information
					$taskInfo['start']    = $task->getExecution()->getStart();
					$taskInfo['end']      = $task->getExecution()->getEnd();
					$taskInfo['interval'] = $task->getExecution()->getInterval();
					$taskInfo['croncmd']  = $task->getExecution()->getCronCmd();
					$taskInfo['multiple'] = $task->getExecution()->getMultiple();

					if (!empty($taskInfo['interval']) || !empty($taskInfo['croncmd'])) {
							// Guess task type from the existing information
							// If an interval or a cron command is defined, it's a recurring task

							// FIXME remove magic numbers for the type, use class constants instead
						$taskInfo['type']      = 2;
						$taskInfo['frequency'] = (empty($taskInfo['interval'])) ? $taskInfo['croncmd'] : $taskInfo['interval'];
					} else {
							// It's not a recurring task
							// Make sure interval and cron command are both empty
						$taskInfo['type']      = 1;
						$taskInfo['frequency'] = '';
						$taskInfo['end']       = 0;
					}
				} else {
					// The task object is not valid

						// Issue error message
					$this->addMessage(sprintf($GLOBALS['LANG']->getLL('msg.invalidTaskClassEdit'), $class), t3lib_FlashMessage::ERROR);
						// Initialize empty values
					$taskInfo['start']     = 0;
					$taskInfo['end']       = 0;
					$taskInfo['frequency'] = '';
					$taskInfo['multiple']  = false;
					$taskInfo['type']      = 1;
				}
			} catch (OutOfBoundsException $e) {
					// Add a message and continue throwing the exception
				$this->addMessage(sprintf($GLOBALS['LANG']->getLL('msg.taskNotFound'), $this->submittedData['uid']), t3lib_FlashMessage::ERROR);
				throw $e;
			}
		} else {
				// If adding a new object, set some default values
			$taskInfo['class'] = key($registeredClasses);
			$taskInfo['type'] = 2;
			$taskInfo['start'] = $GLOBALS['EXEC_TIME'];
			$taskInfo['end'] = '';
			$taskInfo['frequency'] = '';
			$taskInfo['multiple'] = 0;
			$process = 'add';
		}

		if (count($this->submittedData) > 0) {
				// If some data was already submitted, use it to override
				// existing data
			$taskInfo = t3lib_div::array_merge_recursive_overrule($taskInfo, $this->submittedData);
		}

			// Get the extra fields to display for each task that needs some
		$allAdditionalFields = array();
		if ($process == 'add') {
			foreach ($registeredClasses as $class => $registrationInfo) {
				if (!empty($registrationInfo['provider'])) {
					$providerObject = t3lib_div::getUserObj($registrationInfo['provider']);
					if ($providerObject instanceof tx_scheduler_AdditionalFieldProvider) {
						$additionalFields = $providerObject->getAdditionalFields($taskInfo, NULL, $this);
						$allAdditionalFields = array_merge($allAdditionalFields, array($class => $additionalFields));
					}
				}
			}

			// In case of edit, get only the extra fields for the current task class
		} else {
			if (!empty($registeredClasses[$taskInfo['class']]['provider'])) {
				$providerObject = t3lib_div::getUserObj($registeredClasses[$taskInfo['class']]['provider']);
				if ($providerObject instanceof tx_scheduler_AdditionalFieldProvider) {
					$allAdditionalFields[$taskInfo['class']] = $providerObject->getAdditionalFields($taskInfo, $task, $this);
				}
			}
		}

			// Load necessary JavaScript
			/** @var $pageRenderer t3lib_PageRenderer */
		$pageRenderer = $this->doc->getPageRenderer();
		$pageRenderer->loadExtJS();
		$pageRenderer->addJsFile(t3lib_extMgm::extRelPath('scheduler') . 'res/tx_scheduler_be.js');
		$pageRenderer->addJsFile($this->backPath . '../t3lib/js/extjs/tceforms.js');

			// Define settings for Date Picker
		$typo3Settings = array(
			'datePickerUSmode' => $GLOBALS['TYPO3_CONF_VARS']['SYS']['USdateFormat'] ? 1 : 0,
			'dateFormat'       => array('j-n-Y', 'G:i j-n-Y'),
			'dateFormatUS'     => array('n-j-Y', 'G:i n-j-Y'),
		);
		$pageRenderer->addInlineSettingArray('', $typo3Settings);

			// Define table layout for add/edit form
		$tableLayout = array (
			'table' => array ('<table border="0" cellspacing="1" cellpadding="0" id="edit_form">', '</table>'),
		);

			// Define a style for hiding
			// Some fields will be hidden when the task is not recurring
		$style = '';
		if ($taskInfo['type'] == 1) {
			$style = ' style="display: none"';
		}

			// Start rendering the add/edit form
		$content .= '<input type="hidden" name="tx_scheduler[uid]" value="' . $this->submittedData['uid'] . '" />';
		$content .= '<input type="hidden" name="previousCMD" value="' . $this->CMD . '" />';
		$content .= '<input type="hidden" name="CMD" value="save" />';

		$table = array();
		$tr = 0;
		$defaultCell = array('<td class="bgColor5 cell">', '</td>');

			// Disable checkbox
		$table[$tr][] = t3lib_BEfunc::cshItem($this->cshKey, 'task_disable', $this->backPath, '|', false, 'margin-bottom:0px;');
		$table[$tr][] = '<label for="task_disable">' . $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:disable') . '</label>';
		$table[$tr][] =
			'<input type="hidden"   name="tx_scheduler[disable]" value="0" />
			 <input type="checkbox" name="tx_scheduler[disable]" value="1" id="task_disable"' . ($taskInfo['disable'] == 1 ? ' checked="checked"' : '') . ' />';
		$tableLayout[$tr] = array (
			'tr'     => array('<tr id="task_disable_row">', '</tr>'),
			'defCol' => $defaultCell
		);
		$tr++;

			// Task class selector
		$table[$tr][] = t3lib_BEfunc::cshItem($this->cshKey, 'task_class', $this->backPath, '|', false, 'margin-bottom:0px;');
		$table[$tr][] = '<label for="task_class">'.$GLOBALS['LANG']->getLL('label.class').'</label>';
			// On editing, don't allow changing of the task class, unless it was not valid
		if ($this->submittedData['uid'] > 0 && !empty($taskInfo['class'])) {
			$cell = $registeredClasses[$taskInfo['class']]['title'] . ' (' . $registeredClasses[$taskInfo['class']]['extension'] . ')';
			$cell .= '<input type="hidden" name="tx_scheduler[class]" id="task_class" value="' . $taskInfo['class'] . '" />';
		} else {
			$cell = '<select name="tx_scheduler[class]" id="task_class" class="wide" onchange="actOnChangedTaskClass(this)">';
				// Loop on all registered classes to display a selector
			foreach ($registeredClasses as $class => $classInfo) {
				$selected = ($class == $taskInfo['class']) ? ' selected="selected"' : '';
				$cell .= '<option value="' . $class . '"' . $selected . '>' . $classInfo['title'] . ' (' . $classInfo['extension'] . ')' . '</option>';
			}
			$cell .= '</select>';
		}
		$table[$tr][] = $cell;
			// Make sure each row has a unique id, for manipulation with JS
		$tableLayout[$tr] = array (
			'tr'     => array('<tr id="task_class_row">', '</tr>'),
			'defCol' => $defaultCell
		);
		$tr++;

			// Task type selector
		$table[$tr][] = t3lib_BEfunc::cshItem($this->cshKey, 'task_type', $this->backPath, '|', false, 'margin-bottom:0px;');
		$table[$tr][] = '<label for="task_type">' . $GLOBALS['LANG']->getLL('label.type') . '</label>';
		$table[$tr][] =
			'<select name="tx_scheduler[type]" id="task_type" onchange="actOnChangedTaskType(this)">' .
				'<option value="1"' . ($taskInfo['type'] == 1 ? ' selected="selected"' : '') . '>' . $GLOBALS['LANG']->getLL('label.type.single') . '</option>' .
				'<option value="2"' . ($taskInfo['type'] == 2 ? ' selected="selected"' : '') . '>' . $GLOBALS['LANG']->getLL('label.type.recurring') . '</option>' .
			'</select>';
		$tableLayout[$tr] = array (
			'tr'     => array('<tr id="task_type_row">', '</tr>'),
			'defCol' => $defaultCell
		);
		$tr++;

			// Start date/time field
			// NOTE: datetime fields need a special id naming scheme
		$table[$tr][] = t3lib_BEfunc::cshItem($this->cshKey, 'task_start', $this->backPath, '|', false, 'margin-bottom:0px;');
		$table[$tr][] = '<label for="tceforms-datetimefield-task_start">' . $GLOBALS['LANG']->getLL('label.start') . '</label>';
		$table[$tr][] = '<input name="tx_scheduler[start]" type="text" id="tceforms-datetimefield-task_start" value="' . strftime('%H:%M %d-%m-%Y', $taskInfo['start']) . '" />' .
			t3lib_iconWorks::getSpriteIcon(
				'actions-edit-pick-date',
				array(
					'style' => 'cursor:pointer;',
					'id' => 'picker-tceforms-datetimefield-task_start'
				));

		$tableLayout[$tr] = array (
				'tr' => array('<tr id="task_start_row">', '</tr>'),
				'defCol' => $defaultCell
			);
		$tr++;

			// End date/time field
			// NOTE: datetime fields need a special id naming scheme
		$table[$tr][] = t3lib_BEfunc::cshItem($this->cshKey, 'task_end', $this->backPath, '|', false, 'margin-bottom:0px;');
		$table[$tr][] = '<label for="tceforms-datetimefield-task_end">' . $GLOBALS['LANG']->getLL('label.end') . '</label>';
		$table[$tr][] = '<input name="tx_scheduler[end]" type="text" id="tceforms-datetimefield-task_end" value="' . ((empty($taskInfo['end'])) ? '' : strftime('%H:%M %d-%m-%Y', $taskInfo['end'])) . '" />' .
			t3lib_iconWorks::getSpriteIcon(
				'actions-edit-pick-date',
				array(
					'style' => 'cursor:pointer;',
					'id' => 'picker-tceforms-datetimefield-task_end'
				));

		$tableLayout[$tr] = array (
			'tr'     => array('<tr id="task_end_row"' . $style . '>', '</tr>'),
			'defCol' => $defaultCell
		);
		$tr++;

			// Frequency input field
		$table[$tr][] = t3lib_BEfunc::cshItem($this->cshKey, 'task_frequency', $this->backPath, '|', false, 'margin-bottom:0px;');
		$table[$tr][] = '<label for="task_frequency">' . $GLOBALS['LANG']->getLL('label.frequency.long') . '</label>';
		$cell = '<input type="text" name="tx_scheduler[frequency]" id="task_frequency" value="' . $taskInfo['frequency'] . '" />';
		$table[$tr][] = $cell;
		$tableLayout[$tr] = array (
			'tr'     => array('<tr id="task_frequency_row"' . $style . '>', '</tr>'),
			'defCol' => $defaultCell
		);
		$tr++;

			// Multiple execution selector
		$table[$tr][] = t3lib_BEfunc::cshItem($this->cshKey, 'task_multiple', $this->backPath, '|', false, 'margin-bottom:0px;');
		$table[$tr][] = '<label for="task_multiple">' . $GLOBALS['LANG']->getLL('label.parallel.long') . '</label>';
		$table[$tr][] =
			'<input type="hidden"   name="tx_scheduler[multiple]" value="0" />
			 <input type="checkbox" name="tx_scheduler[multiple]" value="1" id="task_multiple"' . ($taskInfo['multiple'] == 1 ? ' checked="checked"' : '') . ' />';
		$tableLayout[$tr] = array (
			'tr'     => array('<tr id="task_multiple_row"' . $style . '>', '</tr>'),
			'defCol' => $defaultCell
		);
		$tr++;

			// Display additional fields
		foreach ($allAdditionalFields as $class => $fields) {
			if ($class == $taskInfo['class']) {
				$additionalFieldsStyle = '';
			} else {
				$additionalFieldsStyle = ' style="display: none"';
			}

				// Add each field to the display, if there are indeed any
			if (isset($fields) && is_array($fields)) {
				foreach ($fields as $fieldID => $fieldInfo) {
					$table[$tr][] = t3lib_BEfunc::cshItem($fieldInfo['cshKey'], $fieldInfo['cshLabel'], $this->backPath, '|', false, 'margin-bottom:0px;');
					$table[$tr][] = '<label for="' . $fieldID . '">' . $GLOBALS['LANG']->sL($fieldInfo['label']) . '</label>';
					$table[$tr][] = $fieldInfo['code'];
					$tableLayout[$tr] = array (
						'tr'     => array('<tr id="' . $fieldID . '_row"' . $additionalFieldsStyle .' class="extraFields extra_fields_' . $class . '">', '</tr>'),
						'defCol' => $defaultCell
					);
					$tr++;
				}
			}
		}

			// Render the add/edit task form
		$content .= $this->doc->table($table, $tableLayout);

		$content .= '<input type="submit" name="save" class="button" value="' . $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:save', TRUE) . '" /> '
			. '<input type="button" name="cancel" class="button" value="' . $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:cancel', TRUE) . '" onclick="document.location=\'' . $GLOBALS['MCONF']['_'] . '\'" />';

			// Display information about server time usage
		$content .= $this->displayServerTime();

		return $content;
	}

	/**
	 * Execute all selected tasks
	 *
	 * @return	void
	 */
	protected function executeTasks() {
			// Continue if some elements have been chosen for execution
		if (isset($this->submittedData['execute']) && count($this->submittedData['execute']) > 0) {

				// Get list of registered classes
			$registeredClasses = self::getRegisteredClasses();

				// Loop on all selected tasks
			foreach ($this->submittedData['execute'] as $uid) {

				try {
						// Try fetching the task
					$task = $this->scheduler->fetchTask($uid);
					$class = get_class($task);
					$name = $registeredClasses[$class]['title']. ' (' . $registeredClasses[$class]['extension'] . ')';
						// Now try to execute it and report on outcome
					try {
						$result = $this->scheduler->executeTask($task);
						if ($result) {
							$this->addMessage(sprintf($GLOBALS['LANG']->getLL('msg.executed'), $name));
						} else {
							$this->addMessage(sprintf($GLOBALS['LANG']->getLL('msg.notExecuted'), $name), t3lib_FlashMessage::ERROR);
						}
					}
					catch (Exception $e) {
							// An exception was thrown, display its message as an error
						$this->addMessage(sprintf($GLOBALS['LANG']->getLL('msg.executionFailed'), $name, $e->getMessage()), t3lib_FlashMessage::ERROR);
					}
				}
					// The task was not found, for some reason
				catch (OutOfBoundsException $e) {
					$this->addMessage(sprintf($GLOBALS['LANG']->getLL('msg.taskNotFound'), $uid), t3lib_FlashMessage::ERROR);
				}
					// The task object was not valid
				catch (UnexpectedValueException $e) {
					$this->addMessage(sprintf($GLOBALS['LANG']->getLL('msg.executionFailed'), $name, $e->getMessage()), t3lib_FlashMessage::ERROR);
				}
			}
				// Record the run in the system registry
			$this->scheduler->recordLastRun('manual');
				// Make sure to switch to list view after execution
			$this->CMD = 'list';
		}
	}

	/**
	 * Assemble display of list of scheduled tasks
	 *
	 * @return	string			table of waiting schedulings
	 */
	protected function listTasks() {
			// Define display format for dates
		$dateFormat = $GLOBALS['TYPO3_CONF_VARS']['SYS']['ddmmyy'] . ' ' . $GLOBALS['TYPO3_CONF_VARS']['SYS']['hhmm'];
		$content = '';

			// Get list of registered classes
		$registeredClasses = self::getRegisteredClasses();

			// Get all registered tasks
		$query = array(
			'SELECT'  => '*',
			'FROM'    => 'tx_scheduler_task',
			'ORDERBY' => 'nextexecution'
		);

		$res = $GLOBALS['TYPO3_DB']->exec_SELECT_queryArray($query);
		$numRows = $GLOBALS['TYPO3_DB']->sql_num_rows($res);
			// No tasks defined, display information message
		if ($numRows == 0) {
				/** @var t3lib_FlashMessage $flashMessage */
			$flashMessage = t3lib_div::makeInstance('t3lib_FlashMessage',
				$GLOBALS['LANG']->getLL('msg.noTasks'),
				'',
				t3lib_FlashMessage::INFO
			);
			$content .= $flashMessage->render();
		} else {
				// Load ExtJS framework and specific JS library
				/** @var $pageRenderer t3lib_PageRenderer */
			$pageRenderer = $this->doc->getPageRenderer();
			$pageRenderer->loadExtJS();
			$pageRenderer->addJsFile(t3lib_extMgm::extRelPath('scheduler') . 'res/tx_scheduler_be.js');

				// Initialise table layout
			$tableLayout = array(
				'table' => array(
					'<table border="0" cellspacing="1" cellpadding="2" class="tx_scheduler_task_list">', '</table>'
				),
				'0'     => array(
					'tr'     => array('<tr class="bgColor2">', '</tr>'),
					'defCol' => array('<td class="cell">', '</td>'),
					'1'      => array('<td style="width: 36px;" class="cell">', '</td>')
				),
				'defRow' => array(
					'tr'     => array('<tr class="bgColor3-20">', '</tr>'),
					'defCol' => array('<td class="cell">', '</td>'),
					'1'		 => array('<td class="cell right">', '</td>'),
					'2'		 => array('<td class="cell right">', '</td>'),
				)
			);
			$disabledTaskRow = array (
				'tr'     => array('<tr class="bgColor3-20 disabled">', '</tr>'),
				'defCol' => array('<td class="cell">', '</td>'),
				'1'		 => array('<td class="cell right">', '</td>'),
				'2'		 => array('<td class="cell right">', '</td>'),
			);
			$rowWithSpan = array (
				'tr'     => array('<tr class="bgColor3-20">', '</tr>'),
				'defCol' => array('<td class="cell">', '</td>'),
				'1'		 => array('<td class="cell right">', '</td>'),
				'2'		 => array('<td class="cell right">', '</td>'),
				'3'		 => array('<td class="cell" colspan="6">', '</td>'),
			);
			$table = array();
			$tr = 0;

				// Header row
			$table[$tr][] = '<a href="#" onclick="toggleCheckboxes();" title="' . $GLOBALS['LANG']->getLL('label.checkAll', TRUE) . '">' .
				t3lib_iconWorks::getSpriteIcon('actions-document-select') .
				'</a>';
			$table[$tr][] = '&nbsp;';
			$table[$tr][] = $GLOBALS['LANG']->getLL('label.id');
			$table[$tr][] = $GLOBALS['LANG']->getLL('task');
			$table[$tr][] = $GLOBALS['LANG']->getLL('label.type');
			$table[$tr][] = $GLOBALS['LANG']->getLL('label.frequency');
			$table[$tr][] = $GLOBALS['LANG']->getLL('label.parallel');
			$table[$tr][] = $GLOBALS['LANG']->getLL('label.lastExecution');
			$table[$tr][] = $GLOBALS['LANG']->getLL('label.nextExecution');
			$tr++;

				// Loop on all tasks
			while (($schedulerRecord = $GLOBALS['TYPO3_DB']->sql_fetch_assoc($res))) {
					// Define action icons
				$editAction = '<a href="' . $GLOBALS['MCONF']['_'] . '&CMD=edit&tx_scheduler[uid]=' . $schedulerRecord['uid'] . '" title="'.$GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:edit', TRUE) . '">' . t3lib_iconWorks::getSpriteIcon('actions-document-open') . '</a>';
				$deleteAction = '<a href="' . $GLOBALS['MCONF']['_'] . '&CMD=delete&tx_scheduler[uid]=' . $schedulerRecord['uid'] . '" onclick="return confirm(\'' . $GLOBALS['LANG']->getLL('msg.delete') . '\');" title="' . $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:delete', TRUE) . '">' . t3lib_iconWorks::getSpriteIcon('actions-edit-delete') . '</a>';
				$stopAction = '<a href="' . $GLOBALS['MCONF']['_'] . '&CMD=stop&tx_scheduler[uid]=' . $schedulerRecord['uid'] . '" onclick="return confirm(\'' . $GLOBALS['LANG']->getLL('msg.stop') . '\');" title="' . $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:stop', TRUE) . '"><img ' . t3lib_iconWorks::skinImg($this->backPath, t3lib_extMgm::extRelPath('scheduler') . '/res/gfx/stop.png') . ' alt="'.$GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:stop') . '" /></a>';
					// Define some default values
				$lastExecution = '-';
				$isRunning = false;
				$executionStatus = 'scheduled';
				$executionStatusDetail = '';
				$executionStatusOutput = '';
				$name = '';
				$nextDate = '-';
				$execType = '-';
				$frequency = '-';
				$multiple = '-';
				$startExecutionElement = '&nbsp;';

					// Restore the serialized task and pass it a reference to the scheduler object
				$task = unserialize($schedulerRecord['serialized_task_object']);

					// Assemble information about last execution
				$context = '';
				if (!empty($schedulerRecord['lastexecution_time'])) {
					$lastExecution = date($dateFormat, $schedulerRecord['lastexecution_time']);
					if ($schedulerRecord['lastexecution_context'] == 'CLI') {
						$context = $GLOBALS['LANG']->getLL('label.cron');
					} else {
						$context = $GLOBALS['LANG']->getLL('label.manual');
					}
					$lastExecution .= ' (' . $context . ')';
				}

				if ($this->scheduler->isValidTaskObject($task)) {
					// The task object is valid

					$name = $registeredClasses[$schedulerRecord['classname']]['title']. ' (' . $registeredClasses[$schedulerRecord['classname']]['extension'] . ')';
					$additionalInformation = $task->getAdditionalInformation();
					if (!empty($additionalInformation)) {
						$name .= ' [' . $additionalInformation . ']';
					}

						// Check if task currently has a running execution
					if (!empty($schedulerRecord['serialized_executions'])) {
						$isRunning = true;
						$executionStatus = 'running';
					}

						// Prepare display of next execution date
						// If task is currently running, date is not displayed (as next hasn't been calculated yet)
						// Also hide the date if task is disabled (the information doesn't make sense, as it will not run anyway)
					if ($isRunning || $schedulerRecord['disable'] == 1) {
						$nextDate = '-';
					}
					else {
						$nextDate = date($dateFormat, $schedulerRecord['nextexecution']);
						if (empty($schedulerRecord['nextexecution'])) {
							$nextDate = $GLOBALS['LANG']->getLL('none');
						} elseif ($schedulerRecord['nextexecution'] < $GLOBALS['EXEC_TIME']) {
								// Next execution is overdue, highlight date
							$nextDate = '<span class="late" title="' . $GLOBALS['LANG']->getLL('status.legend.scheduled') . '">' . $nextDate . '</span>';
							$executionStatus = 'late';
						}
					}

						// Get execution type
					if ($task->getExecution()->getInterval() == 0 && $task->getExecution()->getCronCmd() == '') {
						$execType = $GLOBALS['LANG']->getLL('label.type.single');
						$frequency = '-';
					} else {
						$execType = $GLOBALS['LANG']->getLL('label.type.recurring');
						if ($task->getExecution()->getCronCmd() == '') {
							$frequency = $task->getExecution()->getInterval();
						} else {
							$frequency = $task->getExecution()->getCronCmd();
						}
					}

						// Get multiple executions setting
					if ($task->getExecution()->getMultiple()) {
						$multiple = $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:yes');
					} else {
						$multiple = $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:no');
					}

						// Define checkbox
					$startExecutionElement = '<input type="checkbox" name="tx_scheduler[execute][]" value="' . $schedulerRecord['uid'] . '" id="task_' . $schedulerRecord['uid'] . '" class="checkboxes" />';

						// Show no action links (edit, delete) if task is running
					$actions = $editAction . $deleteAction;
					if ($isRunning) {
						$actions = $stopAction;
					}

						// Check the disable status
						// Row is shown dimmed if task is disabled, unless it is still running
					if ($schedulerRecord['disable'] == 1 && !$isRunning) {
						$tableLayout[$tr] = $disabledTaskRow;
						$executionStatus  = 'disabled';
					}

						// Check if the last run failed
					$failureOutput = '';
					if (!empty($schedulerRecord['lastexecution_failure'])) {
							// Try to get the stored exception object
						$exception = unserialize($schedulerRecord['lastexecution_failure']);
							// If the exception could not be unserialized, issue a default error message
						if ($exception === FALSE) {
							$failureDetail = $GLOBALS['LANG']->getLL('msg.executionFailureDefault');
						} else {
							$failureDetail = sprintf($GLOBALS['LANG']->getLL('msg.executionFailureReport'), $exception->getCode(), $exception->getMessage());
						}
						$failureOutput = ' <img ' . t3lib_iconWorks::skinImg(t3lib_extMgm::extRelPath('scheduler'), 'res/gfx/status_failure.png') . ' alt="' . htmlspecialchars($GLOBALS['LANG']->getLL('status.failure')) . '" title="' . htmlspecialchars($failureDetail) . '" />';
					}

						// Format the execution status,
						// including failure feedback, if any
					$executionStatusOutput = '<img ' . t3lib_iconWorks::skinImg(t3lib_extMgm::extRelPath('scheduler'), 'res/gfx/status_' . $executionStatus . '.png') . ' alt="' . htmlspecialchars($GLOBALS['LANG']->getLL('status.' . $executionStatus)) . '" title="' . htmlspecialchars($executionStatusDetail) . '" />' . $failureOutput . ' ' . htmlspecialchars($name);

					$table[$tr][] = $startExecutionElement;
					$table[$tr][] = $actions;
					$table[$tr][] = $schedulerRecord['uid'];
					$table[$tr][] = $executionStatusOutput;
					$table[$tr][] = $execType;
					$table[$tr][] = $frequency;
					$table[$tr][] = $multiple;
					$table[$tr][] = $lastExecution;
					$table[$tr][] = $nextDate;

				} else {
					// The task object is not valid
					// Prepare to issue an error

						/** @var t3lib_FlashMessage $flashMessage */
					$flashMessage = t3lib_div::makeInstance('t3lib_FlashMessage',
						sprintf($GLOBALS['LANG']->getLL('msg.invalidTaskClass'), $schedulerRecord['classname']),
						'',
						t3lib_FlashMessage::ERROR
					);
					$executionStatusOutput = $flashMessage->render();

					$tableLayout[$tr] = $rowWithSpan;
					$table[$tr][] = $startExecutionElement;
					$table[$tr][] = $deleteAction;
					$table[$tr][] = $schedulerRecord['uid'];
					$table[$tr][] = $executionStatusOutput;
				}

				$tr++;
			}
				// Render table
			$content .= $this->doc->table($table, $tableLayout);

			$content .= '<input type="submit" class="button" name="go" value="' . $GLOBALS['LANG']->getLL('label.executeSelected') . '" />';
		}

		if (count($registeredClasses) > 0) {
				// Display add new task link
			$link = $GLOBALS['MCONF']['_'] . '&CMD=add';
			$content .= '<p><a href="' . htmlspecialchars($link) .'"><img '
				. t3lib_iconWorks::skinImg($this->backPath, 'gfx/new_el.gif')
				. ' alt="' . $GLOBALS['LANG']->sL('LLL:EXT:lang/locallang_common.xml:new', TRUE)
				. '" /> ' . $GLOBALS['LANG']->getLL('action.add') . '</a></p>';
		} else {
				/** @var t3lib_FlashMessage $flashMessage */
			$flashMessage = t3lib_div::makeInstance('t3lib_FlashMessage',
				$GLOBALS['LANG']->getLL('msg.noTasksDefined'),
				'',
				t3lib_FlashMessage::INFO
			);
			$content .= $flashMessage->render();
		}

			// Display legend, if there's at least one registered task
			// Also display information about the usage of server time
		if ($numRows > 0) {
			$content .= $this->doc->spacer(20);
			$content .= '<h4>' . $GLOBALS['LANG']->getLL('status.legend') . '</h4>
			<ul>
				<li><img ' . t3lib_iconWorks::skinImg(t3lib_extMgm::extRelPath('scheduler'), 'res/gfx/status_failure.png') . ' alt="' . htmlspecialchars($GLOBALS['LANG']->getLL('status.failure')) . '" /> ' . $GLOBALS['LANG']->getLL('status.legend.failure') . '</li>
				<li><img ' . t3lib_iconWorks::skinImg(t3lib_extMgm::extRelPath('scheduler'), 'res/gfx/status_late.png') . ' alt="' . htmlspecialchars($GLOBALS['LANG']->getLL('status.late')) . '" /> ' . $GLOBALS['LANG']->getLL('status.legend.late') . '</li>
				<li><img ' . t3lib_iconWorks::skinImg(t3lib_extMgm::extRelPath('scheduler'), 'res/gfx/status_running.png') . ' alt="' . htmlspecialchars($GLOBALS['LANG']->getLL('status.running')) . '" /> ' . $GLOBALS['LANG']->getLL('status.legend.running') . '</li>
				<li><img ' . t3lib_iconWorks::skinImg(t3lib_extMgm::extRelPath('scheduler'), 'res/gfx/status_scheduled.png') . ' alt="' . htmlspecialchars($GLOBALS['LANG']->getLL('status.scheduled')) . '" /> ' . $GLOBALS['LANG']->getLL('status.legend.scheduled') . '</li>
				<li><img ' . t3lib_iconWorks::skinImg(t3lib_extMgm::extRelPath('scheduler'), 'res/gfx/status_disabled.png') . ' alt="' . htmlspecialchars($GLOBALS['LANG']->getLL('status.disabled')) . '" /> ' . $GLOBALS['LANG']->getLL('status.legend.disabled') . '</li>
			</ul>';
			$content .= $this->doc->spacer(10);
			$content .= $this->displayServerTime();
		}


		$GLOBALS['TYPO3_DB']->sql_free_result($res);

		return $content;
	}

	/**
	 * Saves a task specified in the backend form to the database
	 *
	 * @return	void
	 */
	protected function saveTask() {

			// If a task is being edited fetch old task data
		if (!empty($this->submittedData['uid'])) {
			try {
				$taskRecord = $this->scheduler->fetchTaskRecord($this->submittedData['uid']);
				/**
				 * @var	tx_scheduler_Task
				 */
				$task = unserialize($taskRecord['serialized_task_object']);
			} catch (OutOfBoundsException $e) {
					// If the task could not be fetched, issue an error message
					// and exit early
				$this->addMessage(sprintf($GLOBALS['LANG']->getLL('msg.taskNotFound'), $this->submittedData['uid']), t3lib_FlashMessage::ERROR);
				return;
			}

				// Register single execution
			if ($this->submittedData['type'] == 1) {
				$task->registerSingleExecution($this->submittedData['start']);

				// Else, it's a recurring task
			} else {
				if (!empty($this->submittedData['croncmd'])) {
						// Definition by cron-like syntax

					$interval = 0;
					$cronCmd = $this->submittedData['croncmd'];
				} else {
						// Definition by interval

					$interval = $this->submittedData['interval'];
					$cronCmd = '';
				}

					// Register recurring execution
				$task->registerRecurringExecution($this->submittedData['start'], $interval, $this->submittedData['end'], $this->submittedData['multiple'], $cronCmd);
			}

				// Set disable flag
			$task->setDisabled($this->submittedData['disable']);

				// Save additional input values
			if (!empty($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['scheduler']['tasks'][$this->submittedData['class']]['additionalFields'])) {
				$providerObject = t3lib_div::getUserObj($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['scheduler']['tasks'][$this->submittedData['class']]['additionalFields']);
				if ($providerObject instanceof tx_scheduler_AdditionalFieldProvider) {
					$providerObject->saveAdditionalFields($this->submittedData, $task);
				}
			}

				// Save to database
			$result = $this->scheduler->saveTask($task);
			if ($result) {
				$this->addMessage($GLOBALS['LANG']->getLL('msg.updateSuccess'));
			} else {
				$this->addMessage($GLOBALS['LANG']->getLL('msg.updateError'), t3lib_FlashMessage::ERROR);
			}
		} else {
				// A new task is being created

				// Create an instance of chosen class
			$task = t3lib_div::makeInstance($this->submittedData['class']);

			if ($this->submittedData['type'] == 1) {
					// Set up single execution
				$task->registerSingleExecution($this->submittedData['start']);
			} else {
					// Set up recurring execution
				$task->registerRecurringExecution(…