Add public interface to background jobs

lib/public/backgroundjob.php

+<?php
+/**
+* ownCloud
+*
+* @author Jakob Sack
+* @copyright 2012 Jakob Sack owncloud@jakobsack.de
+*
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
+* License as published by the Free Software Foundation; either
+* version 3 of the License, or any later version.
+*
+* This library 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 AFFERO GENERAL PUBLIC LICENSE for more details.
+*
+* You should have received a copy of the GNU Affero General Public
+* License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+*
+*/
+
+/**
+ * Public interface of ownCloud forbackground jobs.
+ */
+
+// use OCP namespace for all classes that are considered public. 
+// This means that they should be used by apps instead of the internal ownCloud classes
+namespace OCP;
+
+/**
+ * This class provides functions to manage backgroundjobs in ownCloud
+ *
+ * There are two kind of background jobs in ownCloud: regular tasks and
+ * scheduled tasks.
+ *
+ * Regular tasks have to be registered in appinfo.php and
+ * will run on a regular base. Fetching news could be a task that should run
+ * frequently.
+ *
+ * Scheduled tasks have to be registered each time you want to execute them.
+ * An example of the scheduled task would be the creation of the thumbnail. As
+ * soon as the user uploads a picture the gallery app registers the scheduled
+ * task "create thumbnail" and saves the path in the parameter. As soon as the
+ * task is done it will be deleted from the list.
+ */
+class Backgroundjob {
+	/**
+	 * @brief creates a regular task
+	 * @param $klass class name
+	 * @param $method method name
+	 * @return true
+	 */
+	public static function addRegularTask( $klass, $method ){
+		return \OC_BackgroundJob_RegularTask::register( $klass, $method );
+	}
+
+	/**
+	 * @brief gets all regular tasks
+	 * @return associative array
+	 *
+	 * key is string "$klass-$method", value is array( $klass, $method )
+	 */
+	static public function allRegularTasks(){
+		return \OC_BackgroundJob_RegularTask::all();
+	}
+
+	/**
+	 * @brief Gets one scheduled task
+	 * @param $id ID of the task
+	 * @return associative array
+	 */
+	public static function findScheduledTask( $id ){
+		return \OC_BackgroundJob_ScheduledTask::find( $id );
+	}
+
+	/**
+	 * @brief Gets all scheduled tasks
+	 * @return array with associative arrays
+	 */
+	public static function allScheduledTasks(){
+		return \OC_BackgroundJob_ScheduledTask::all();
+	}
+
+	/**
+	 * @brief Gets all scheduled tasks of a specific app
+	 * @param $app app name
+	 * @return array with associative arrays
+	 */
+	public static function scheduledTaskWhereAppIs( $app ){
+		return \OC_BackgroundJob_ScheduledTask::whereAppIs( $app );
+	}
+
+	/**
+	 * @brief schedules a task
+	 * @param $app app name
+	 * @param $klass class name
+	 * @param $method method name
+	 * @param $parameters all useful data as text
+	 * @return id of task
+	 */
+	public static function addScheduledTask( $task, $klass, $method, $parameters ){
+		return \OC_BackgroundJob_ScheduledTask::add( $task, $klass, $method, $parameters );
+	}
+
+	/**
+	 * @brief deletes a scheduled task
+	 * @param $id id of task
+	 * @return true/false
+	 *
+	 * Deletes a report
+	 */
+	public static function deleteScheduledTask( $id ){
+		return \OC_BackgroundJob_ScheduledTask::delete( $id );
+	}
+}