X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FCore%2FWorker.php;h=00b22c78858c0b06c34ca643174b251fca5a5240;hb=3cd654e76f32dbcf505aef6a60a3e42d318f8b61;hp=760b40b1d30eb19adb742d85b8077fe385d5e730;hpb=eec2289619469ad4e43b760a980c56e5ea406568;p=friendica.git

diff --git a/src/Core/Worker.php b/src/Core/Worker.php
index 760b40b1d3..00b22c7885 100644
--- a/src/Core/Worker.php
+++ b/src/Core/Worker.php
@@ -4,16 +4,11 @@
  */
 namespace Friendica\Core;
 
-use Friendica\App;
-use Friendica\Core\System;
-use Friendica\Core\Config;
-use Friendica\Core\Worker;
-use Friendica\Database\DBM;
-use Friendica\Util\Lock;
-
-use dba;
-
-require_once 'include/dba.php';
+use Friendica\BaseObject;
+use Friendica\Database\DBA;
+use Friendica\Model\Process;
+use Friendica\Util\DateTimeFormat;
+use Friendica\Util\Network;
 
 /**
  * @file src/Core/Worker.php
@@ -36,50 +31,51 @@ class Worker
 	 *
 	 * @param boolean $run_cron Should the cron processes be executed?
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function processQueue($run_cron = true)
 	{
-		$a = get_app();
+		$a = \get_app();
 
 		self::$up_start = microtime(true);
 
 		// At first check the maximum load. We shouldn't continue with a high load
-		if ($a->maxload_reached()) {
-			logger('Pre check: maximum load reached, quitting.', LOGGER_DEBUG);
+		if ($a->isMaxLoadReached()) {
+			Logger::log('Pre check: maximum load reached, quitting.', Logger::DEBUG);
 			return;
 		}
 
 		// We now start the process. This is done after the load check since this could increase the load.
-		$a->start_process();
+		self::startProcess();
 
 		// Kill stale processes every 5 minutes
-		$last_cleanup = Config::get('system', 'poller_last_cleaned', 0);
+		$last_cleanup = Config::get('system', 'worker_last_cleaned', 0);
 		if (time() > ($last_cleanup + 300)) {
-			Config::set('system', 'poller_last_cleaned', time());
+			Config::set('system', 'worker_last_cleaned', time());
 			self::killStaleWorkers();
 		}
 
 		// Count active workers and compare them with a maximum value that depends on the load
 		if (self::tooMuchWorkers()) {
-			logger('Pre check: Active worker limit reached, quitting.', LOGGER_DEBUG);
+			Logger::log('Pre check: Active worker limit reached, quitting.', Logger::DEBUG);
 			return;
 		}
 
 		// Do we have too few memory?
-		if ($a->min_memory_reached()) {
-			logger('Pre check: Memory limit reached, quitting.', LOGGER_DEBUG);
+		if ($a->isMinMemoryReached()) {
+			Logger::log('Pre check: Memory limit reached, quitting.', Logger::DEBUG);
 			return;
 		}
 
 		// Possibly there are too much database connections
 		if (self::maxConnectionsReached()) {
-			logger('Pre check: maximum connections reached, quitting.', LOGGER_DEBUG);
+			Logger::log('Pre check: maximum connections reached, quitting.', Logger::DEBUG);
 			return;
 		}
 
 		// Possibly there are too much database processes that block the system
-		if ($a->max_processes_reached()) {
-			logger('Pre check: maximum processes reached, quitting.', LOGGER_DEBUG);
+		if ($a->isMaxProcessesReached()) {
+			Logger::log('Pre check: maximum processes reached, quitting.', Logger::DEBUG);
 			return;
 		}
 
@@ -102,72 +98,89 @@ class Worker
 
 				// The work will be done
 				if (!self::execute($entry)) {
-					logger('Process execution failed, quitting.', LOGGER_DEBUG);
+					Logger::log('Process execution failed, quitting.', Logger::DEBUG);
 					return;
 				}
 
 				// If possible we will fetch new jobs for this worker
-				if (!$refetched && Lock::set('poller_worker_process', 0)) {
+				if (!$refetched && Lock::acquire('worker_process', 0)) {
 					$stamp = (float)microtime(true);
 					$refetched = self::findWorkerProcesses($passing_slow);
 					self::$db_duration += (microtime(true) - $stamp);
-					Lock::remove('poller_worker_process');
+					Lock::release('worker_process');
 				}
 			}
 
 			// To avoid the quitting of multiple workers only one worker at a time will execute the check
-			if (Lock::set('poller_worker', 0)) {
+			if (Lock::acquire('worker', 0)) {
 				$stamp = (float)microtime(true);
 				// Count active workers and compare them with a maximum value that depends on the load
 				if (self::tooMuchWorkers()) {
-					logger('Active worker limit reached, quitting.', LOGGER_DEBUG);
+					Logger::log('Active worker limit reached, quitting.', Logger::DEBUG);
+					Lock::release('worker');
 					return;
 				}
 
 				// Check free memory
-				if ($a->min_memory_reached()) {
-					logger('Memory limit reached, quitting.', LOGGER_DEBUG);
+				if ($a->isMinMemoryReached()) {
+					Logger::log('Memory limit reached, quitting.', Logger::DEBUG);
+					Lock::release('worker');
 					return;
 				}
-				Lock::remove('poller_worker');
+				Lock::release('worker');
 				self::$db_duration += (microtime(true) - $stamp);
 			}
 
 			// Quit the worker once every 5 minutes
 			if (time() > ($starttime + 300)) {
-				logger('Process lifetime reached, quitting.', LOGGER_DEBUG);
+				Logger::log('Process lifetime reached, quitting.', Logger::DEBUG);
 				return;
 			}
 		}
-		logger("Couldn't select a workerqueue entry, quitting.", LOGGER_DEBUG);
+
+		// Cleaning up. Possibly not needed, but it doesn't harm anything.
+		if (Config::get('system', 'worker_daemon_mode', false)) {
+			self::IPCSetJobState(false);
+		}
+		Logger::log("Couldn't select a workerqueue entry, quitting process " . getmypid() . ".", Logger::DEBUG);
+	}
+
+	/**
+	 * @brief Returns the number of deferred entries in the worker queue
+	 *
+	 * @return integer Number of deferred entries in the worker queue
+	 * @throws \Exception
+	 */
+	private static function deferredEntries()
+	{
+		return DBA::count('workerqueue', ["`executed` <= ? AND NOT `done` AND `next_try` > ?",
+			DBA::NULL_DATETIME, DateTimeFormat::utcNow()]);
 	}
 
 	/**
 	 * @brief Returns the number of non executed entries in the worker queue
 	 *
 	 * @return integer Number of non executed entries in the worker queue
+	 * @throws \Exception
 	 */
 	private static function totalEntries()
 	{
-		$s = dba::fetch_first("SELECT COUNT(*) AS `total` FROM `workerqueue` WHERE `executed` <= ? AND NOT `done`", NULL_DATE);
-		if (DBM::is_result($s)) {
-			return $s["total"];
-		} else {
-			return 0;
-		}
+		return DBA::count('workerqueue', ["`executed` <= ? AND NOT `done` AND `next_try` < ?",
+			DBA::NULL_DATETIME, DateTimeFormat::utcNow()]);
 	}
 
 	/**
 	 * @brief Returns the highest priority in the worker queue that isn't executed
 	 *
 	 * @return integer Number of active worker processes
+	 * @throws \Exception
 	 */
 	private static function highestPriority()
 	{
-		$condition = array("`executed` <= ? AND NOT `done`", NULL_DATE);
-		$s = dba::select('workerqueue', array('priority'), $condition, array('limit' => 1, 'order' => array('priority')));
-		if (DBM::is_result($s)) {
-			return $s["priority"];
+		$condition = ["`executed` <= ? AND NOT `done` AND `next_try` < ?", DBA::NULL_DATETIME, DateTimeFormat::utcNow()];
+		$workerqueue = DBA::selectFirst('workerqueue', ['priority'], $condition, ['order' => ['priority']]);
+		if (DBA::isResult($workerqueue)) {
+			return $workerqueue["priority"];
 		} else {
 			return 0;
 		}
@@ -179,11 +192,13 @@ class Worker
 	 * @param integer $priority The priority that should be checked
 	 *
 	 * @return integer Is there a process running with that priority?
+	 * @throws \Exception
 	 */
 	private static function processWithPriorityActive($priority)
 	{
-		$condition = array("`priority` <= ? AND `executed` > ? AND NOT `done`", $priority, NULL_DATE);
-		return dba::exists('workerqueue', $condition);
+		$condition = ["`priority` <= ? AND `executed` > ? AND NOT `done` AND `next_try` < ?",
+			$priority, DBA::NULL_DATETIME, DateTimeFormat::utcNow()];
+		return DBA::exists('workerqueue', $condition);
 	}
 
 	/**
@@ -192,32 +207,33 @@ class Worker
 	 * @param array $queue Workerqueue entry
 	 *
 	 * @return boolean "true" if further processing should be stopped
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function execute($queue)
 	{
-		$a = get_app();
+		$a = \get_app();
 
 		$mypid = getmypid();
 
 		// Quit when in maintenance
-		if (Config::get('system', 'maintenance', true)) {
-			logger("Maintenance mode - quit process ".$mypid, LOGGER_DEBUG);
+		if (Config::get('system', 'maintenance', false, true)) {
+			Logger::log("Maintenance mode - quit process ".$mypid, Logger::DEBUG);
 			return false;
 		}
 
 		// Constantly check the number of parallel database processes
-		if ($a->max_processes_reached()) {
-			logger("Max processes reached for process ".$mypid, LOGGER_DEBUG);
+		if ($a->isMaxProcessesReached()) {
+			Logger::log("Max processes reached for process ".$mypid, Logger::DEBUG);
 			return false;
 		}
 
 		// Constantly check the number of available database connections to let the frontend be accessible at any time
 		if (self::maxConnectionsReached()) {
-			logger("Max connection reached for process ".$mypid, LOGGER_DEBUG);
+			Logger::log("Max connection reached for process ".$mypid, Logger::DEBUG);
 			return false;
 		}
 
-		$argv = json_decode($queue["parameter"]);
+		$argv = json_decode($queue["parameter"], true);
 
 		// Check for existance and validity of the include file
 		$include = $argv[0];
@@ -233,7 +249,7 @@ class Worker
 
 			if ($age > 1) {
 				$stamp = (float)microtime(true);
-				dba::update('workerqueue', array('executed' => datetime_convert()), array('pid' => $mypid, 'done' => false));
+				DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
 				self::$db_duration += (microtime(true) - $stamp);
 			}
 
@@ -242,8 +258,10 @@ class Worker
 			self::execFunction($queue, $include, $argv, true);
 
 			$stamp = (float)microtime(true);
-			if (dba::update('workerqueue', array('done' => true), array('id' => $queue["id"]))) {
-				Config::set('system', 'last_poller_execution', datetime_convert());
+
+			$condition = ["`id` = ? AND `next_try` < ?", $queue['id'], DateTimeFormat::utcNow()];
+			if (DBA::update('workerqueue', ['done' => true], $condition)) {
+				Config::set('system', 'last_worker_execution', DateTimeFormat::utcNow());
 			}
 			self::$db_duration = (microtime(true) - $stamp);
 
@@ -256,8 +274,8 @@ class Worker
 		}
 
 		if (!validate_include($include)) {
-			logger("Include file ".$argv[0]." is not valid!");
-			dba::delete('workerqueue', array('id' => $queue["id"]));
+			Logger::log("Include file ".$argv[0]." is not valid!");
+			DBA::delete('workerqueue', ['id' => $queue["id"]]);
 			return true;
 		}
 
@@ -276,20 +294,20 @@ class Worker
 
 			if ($age > 1) {
 				$stamp = (float)microtime(true);
-				dba::update('workerqueue', array('executed' => datetime_convert()), array('pid' => $mypid, 'done' => false));
+				DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow()], ['pid' => $mypid, 'done' => false]);
 				self::$db_duration += (microtime(true) - $stamp);
 			}
 
 			self::execFunction($queue, $funcname, $argv, false);
 
 			$stamp = (float)microtime(true);
-			if (dba::update('workerqueue', array('done' => true), array('id' => $queue["id"]))) {
-				Config::set('system', 'last_poller_execution', datetime_convert());
+			if (DBA::update('workerqueue', ['done' => true], ['id' => $queue["id"]])) {
+				Config::set('system', 'last_worker_execution', DateTimeFormat::utcNow());
 			}
 			self::$db_duration = (microtime(true) - $stamp);
 		} else {
-			logger("Function ".$funcname." does not exist");
-			dba::delete('workerqueue', array('id' => $queue["id"]));
+			Logger::log("Function ".$funcname." does not exist");
+			DBA::delete('workerqueue', ['id' => $queue["id"]]);
 		}
 
 		return true;
@@ -303,18 +321,19 @@ class Worker
 	 * @param array   $argv        Array of values to be passed to the function
 	 * @param boolean $method_call boolean
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function execFunction($queue, $funcname, $argv, $method_call)
 	{
-		$a = get_app();
+		$a = \get_app();
 
 		$mypid = getmypid();
 
 		$argc = count($argv);
 
-		$new_process_id = uniqid("wrk", true);
+		$new_process_id = System::processID("wrk");
 
-		logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]." - Process PID: ".$new_process_id);
+		Logger::log("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." ".$queue["parameter"]." - Process PID: ".$new_process_id);
 
 		$stamp = (float)microtime(true);
 
@@ -324,13 +343,15 @@ class Worker
 			$a->performance["start"] = microtime(true);
 			$a->performance["database"] = 0;
 			$a->performance["database_write"] = 0;
+			$a->performance["cache"] = 0;
+			$a->performance["cache_write"] = 0;
 			$a->performance["network"] = 0;
 			$a->performance["file"] = 0;
 			$a->performance["rendering"] = 0;
 			$a->performance["parser"] = 0;
 			$a->performance["marktime"] = 0;
 			$a->performance["markstart"] = microtime(true);
-			$a->callstack = array();
+			$a->callstack = [];
 		}
 
 		// For better logging create a new process id for every worker call
@@ -353,7 +374,7 @@ class Worker
 		$a->process_id = $old_process_id;
 		unset($a->queue);
 
-		$duration = number_format(microtime(true) - $stamp, 3);
+		$duration = (microtime(true) - $stamp);
 
 		self::$up_start = microtime(true);
 
@@ -362,35 +383,36 @@ class Worker
 		 * The execution time is the productive time.
 		 * By changing parameters like the maximum number of workers we can check the effectivness.
 		*/
-		logger(
+		Logger::log(
 			'DB: '.number_format(self::$db_duration, 2).
 			' - Lock: '.number_format(self::$lock_duration, 2).
 			' - Rest: '.number_format($up_duration - self::$db_duration - self::$lock_duration, 2).
 			' - Execution: '.number_format($duration, 2),
-			LOGGER_DEBUG
+			Logger::DEBUG
 		);
 
 		self::$lock_duration = 0;
 
 		if ($duration > 3600) {
-			logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", LOGGER_DEBUG);
+			Logger::log("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 1 hour (".round($duration/60, 3).")", Logger::DEBUG);
 		} elseif ($duration > 600) {
-			logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
+			Logger::log("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 10 minutes (".round($duration/60, 3).")", Logger::DEBUG);
 		} elseif ($duration > 300) {
-			logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
+			Logger::log("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 5 minutes (".round($duration/60, 3).")", Logger::DEBUG);
 		} elseif ($duration > 120) {
-			logger("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", LOGGER_DEBUG);
+			Logger::log("Prio ".$queue["priority"].": ".$queue["parameter"]." - longer than 2 minutes (".round($duration/60, 3).")", Logger::DEBUG);
 		}
 
-		logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds. Process PID: ".$new_process_id);
+		Logger::log("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - done in ".$duration." seconds. Process PID: ".$new_process_id);
 
 		// Write down the performance values into the log
 		if (Config::get("system", "profiler")) {
 			$duration = microtime(true)-$a->performance["start"];
 
+			$o = '';
 			if (Config::get("rendertime", "callstack")) {
 				if (isset($a->callstack["database"])) {
-					$o = "\nDatabase Read:\n";
+					$o .= "\nDatabase Read:\n";
 					foreach ($a->callstack["database"] as $func => $time) {
 						$time = round($time, 3);
 						if ($time > 0) {
@@ -407,6 +429,24 @@ class Worker
 						}
 					}
 				}
+				if (isset($a->callstack["dache"])) {
+					$o .= "\nCache Read:\n";
+					foreach ($a->callstack["dache"] as $func => $time) {
+						$time = round($time, 3);
+						if ($time > 0) {
+							$o .= $func.": ".$time."\n";
+						}
+					}
+				}
+				if (isset($a->callstack["dache_write"])) {
+					$o .= "\nCache Write:\n";
+					foreach ($a->callstack["dache_write"] as $func => $time) {
+						$time = round($time, 3);
+						if ($time > 0) {
+							$o .= $func.": ".$time."\n";
+						}
+					}
+				}
 				if (isset($a->callstack["network"])) {
 					$o .= "\nNetwork:\n";
 					foreach ($a->callstack["network"] as $func => $time) {
@@ -416,28 +456,30 @@ class Worker
 						}
 					}
 				}
-			} else {
-				$o = '';
 			}
 
-			logger(
+			Logger::log(
 				"ID ".$queue["id"].": ".$funcname.": ".sprintf(
-					"DB: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
+					"DB: %s/%s, Cache: %s/%s, Net: %s, I/O: %s, Other: %s, Total: %s".$o,
 					number_format($a->performance["database"] - $a->performance["database_write"], 2),
 					number_format($a->performance["database_write"], 2),
+					number_format($a->performance["cache"], 2),
+					number_format($a->performance["cache_write"], 2),
 					number_format($a->performance["network"], 2),
 					number_format($a->performance["file"], 2),
-					number_format($duration - ($a->performance["database"] + $a->performance["network"] + $a->performance["file"]), 2),
+					number_format($duration - ($a->performance["database"]
+						+ $a->performance["cache"] + $a->performance["cache_write"]
+						+ $a->performance["network"] + $a->performance["file"]), 2),
 					number_format($duration, 2)
 				),
-				LOGGER_DEBUG
+				Logger::DEBUG
 			);
 		}
 
 		$cooldown = Config::get("system", "worker_cooldown", 0);
 
 		if ($cooldown > 0) {
-			logger("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
+			Logger::log("Process ".$mypid." - Prio ".$queue["priority"]." - ID ".$queue["id"].": ".$funcname." - in cooldown for ".$cooldown." seconds");
 			sleep($cooldown);
 		}
 	}
@@ -446,6 +488,7 @@ class Worker
 	 * @brief Checks if the number of database connections has reached a critical limit.
 	 *
 	 * @return bool Are more than 3/4 of the maximum connections used?
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function maxConnectionsReached()
 	{
@@ -457,13 +500,13 @@ class Worker
 
 		if ($max == 0) {
 			// the maximum number of possible user connections can be a system variable
-			$r = dba::fetch_first("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
-			if (DBM::is_result($r)) {
+			$r = DBA::fetchFirst("SHOW VARIABLES WHERE `variable_name` = 'max_user_connections'");
+			if (DBA::isResult($r)) {
 				$max = $r["Value"];
 			}
 			// Or it can be granted. This overrides the system variable
-			$r = dba::p('SHOW GRANTS');
-			while ($grants = dba::fetch($r)) {
+			$r = DBA::p('SHOW GRANTS');
+			while ($grants = DBA::fetch($r)) {
 				$grant = array_pop($grants);
 				if (stristr($grant, "GRANT USAGE ON")) {
 					if (preg_match("/WITH MAX_USER_CONNECTIONS (\d*)/", $grant, $match)) {
@@ -471,98 +514,100 @@ class Worker
 					}
 				}
 			}
-			dba::close($r);
+			DBA::close($r);
 		}
 
 		// If $max is set we will use the processlist to determine the current number of connections
 		// The processlist only shows entries of the current user
 		if ($max != 0) {
-			$r = dba::p('SHOW PROCESSLIST');
-			$used = dba::num_rows($r);
-			dba::close($r);
+			$r = DBA::p('SHOW PROCESSLIST');
+			$used = DBA::numRows($r);
+			DBA::close($r);
 
-			logger("Connection usage (user values): ".$used."/".$max, LOGGER_DEBUG);
+			Logger::log("Connection usage (user values): ".$used."/".$max, Logger::DEBUG);
 
 			$level = ($used / $max) * 100;
 
 			if ($level >= $maxlevel) {
-				logger("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
+				Logger::log("Maximum level (".$maxlevel."%) of user connections reached: ".$used."/".$max);
 				return true;
 			}
 		}
 
 		// We will now check for the system values.
 		// This limit could be reached although the user limits are fine.
-		$r = dba::fetch_first("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
-		if (!DBM::is_result($r)) {
+		$r = DBA::fetchFirst("SHOW VARIABLES WHERE `variable_name` = 'max_connections'");
+		if (!DBA::isResult($r)) {
 			return false;
 		}
 		$max = intval($r["Value"]);
 		if ($max == 0) {
 			return false;
 		}
-		$r = dba::fetch_first("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
-		if (!DBM::is_result($r)) {
+		$r = DBA::fetchFirst("SHOW STATUS WHERE `variable_name` = 'Threads_connected'");
+		if (!DBA::isResult($r)) {
 			return false;
 		}
 		$used = intval($r["Value"]);
 		if ($used == 0) {
 			return false;
 		}
-		logger("Connection usage (system values): ".$used."/".$max, LOGGER_DEBUG);
+		Logger::log("Connection usage (system values): ".$used."/".$max, Logger::DEBUG);
 
 		$level = $used / $max * 100;
 
 		if ($level < $maxlevel) {
 			return false;
 		}
-		logger("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
+		Logger::log("Maximum level (".$level."%) of system connections reached: ".$used."/".$max);
 		return true;
 	}
 
 	/**
 	 * @brief fix the queue entry if the worker process died
 	 * @return void
+	 * @throws \Exception
 	 */
 	private static function killStaleWorkers()
 	{
-		$entries = dba::select(
+		$entries = DBA::select(
 			'workerqueue',
-			array('id', 'pid', 'executed', 'priority', 'parameter'),
-			array('`executed` > ? AND NOT `done` AND `pid` != 0', NULL_DATE),
-			array('order' => array('priority', 'created'))
+			['id', 'pid', 'executed', 'priority', 'parameter'],
+			['`executed` > ? AND NOT `done` AND `pid` != 0', DBA::NULL_DATETIME],
+			['order' => ['priority', 'created']]
 		);
 
-		while ($entry = dba::fetch($entries)) {
+		while ($entry = DBA::fetch($entries)) {
 			if (!posix_kill($entry["pid"], 0)) {
-				dba::update(
+				DBA::update(
 					'workerqueue',
-					array('executed' => NULL_DATE, 'pid' => 0),
-					array('id' => $entry["id"])
+					['executed' => DBA::NULL_DATETIME, 'pid' => 0],
+					['id' => $entry["id"]]
 				);
 			} else {
 				// Kill long running processes
 				// Check if the priority is in a valid range
-				if (!in_array($entry["priority"], array(PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE))) {
+				if (!in_array($entry["priority"], [PRIORITY_CRITICAL, PRIORITY_HIGH, PRIORITY_MEDIUM, PRIORITY_LOW, PRIORITY_NEGLIGIBLE])) {
 					$entry["priority"] = PRIORITY_MEDIUM;
 				}
 
 				// Define the maximum durations
-				$max_duration_defaults = array(PRIORITY_CRITICAL => 720, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 720);
+				$max_duration_defaults = [PRIORITY_CRITICAL => 720, PRIORITY_HIGH => 10, PRIORITY_MEDIUM => 60, PRIORITY_LOW => 180, PRIORITY_NEGLIGIBLE => 720];
 				$max_duration = $max_duration_defaults[$entry["priority"]];
 
-				$argv = json_decode($entry["parameter"]);
+				$argv = json_decode($entry["parameter"], true);
 				$argv[0] = basename($argv[0]);
 
 				// How long is the process already running?
 				$duration = (time() - strtotime($entry["executed"])) / 60;
 				if ($duration > $max_duration) {
-					logger("Worker process ".$entry["pid"]." (".implode(" ", $argv).") took more than ".$max_duration." minutes. It will be killed now.");
+					Logger::log("Worker process ".$entry["pid"]." (".substr(json_encode($argv), 0, 50).") took more than ".$max_duration." minutes. It will be killed now.");
 					posix_kill($entry["pid"], SIGTERM);
 
 					// We killed the stale process.
 					// To avoid a blocking situation we reschedule the process at the beginning of the queue.
 					// Additionally we are lowering the priority. (But not PRIORITY_CRITICAL)
+					$new_priority = $entry["priority"];
 					if ($entry["priority"] == PRIORITY_HIGH) {
 						$new_priority = PRIORITY_MEDIUM;
 					} elseif ($entry["priority"] == PRIORITY_MEDIUM) {
@@ -570,13 +615,13 @@ class Worker
 					} elseif ($entry["priority"] != PRIORITY_CRITICAL) {
 						$new_priority = PRIORITY_NEGLIGIBLE;
 					}
-					dba::update(
+					DBA::update(
 						'workerqueue',
-						array('executed' => NULL_DATE, 'created' => datetime_convert(), 'priority' => $new_priority, 'pid' => 0),
-						array('id' => $entry["id"])
+						['executed' => DBA::NULL_DATETIME, 'created' => DateTimeFormat::utcNow(), 'priority' => $new_priority, 'pid' => 0],
+						['id' => $entry["id"]]
 					);
 				} else {
-					logger("Worker process ".$entry["pid"]." (".implode(" ", $argv).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", LOGGER_DEBUG);
+					Logger::log("Worker process ".$entry["pid"]." (".substr(json_encode($argv), 0, 50).") now runs for ".round($duration)." of ".$max_duration." allowed minutes. That's okay.", Logger::DEBUG);
 				}
 			}
 		}
@@ -586,6 +631,7 @@ class Worker
 	 * @brief Checks if the number of active workers exceeds the given limits
 	 *
 	 * @return bool Are there too much workers running?
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function tooMuchWorkers()
 	{
@@ -596,91 +642,105 @@ class Worker
 		$active = self::activeWorkers();
 
 		// Decrease the number of workers at higher load
-		$load = current_load();
+		$load = System::currentLoad();
 		if ($load) {
 			$maxsysload = intval(Config::get("system", "maxloadavg", 50));
 
-			$maxworkers = $queues;
+			/* Default exponent 3 causes queues to rapidly decrease as load increases.
+			 * If you have 20 max queues at idle, then you get only 5 queues at 37.1% of $maxsysload.
+			 * For some environments, this rapid decrease is not needed.
+			 * With exponent 1, you could have 20 max queues at idle and 13 at 37% of $maxsysload.
+			 */
+			$exponent = intval(Config::get('system', 'worker_load_exponent', 3));
+			$slope = pow(max(0, $maxsysload - $load) / $maxsysload, $exponent);
+			$queues = intval(ceil($slope * $maxqueues));
 
-			// Some magical mathemathics to reduce the workers
-			$exponent = 3;
-			$slope = $maxworkers / pow($maxsysload, $exponent);
-			$queues = ceil($slope * pow(max(0, $maxsysload - $load), $exponent));
+			$processlist = '';
 
 			if (Config::get('system', 'worker_debug')) {
 				// Create a list of queue entries grouped by their priority
-				$listitem = array();
+				$listitem = [];
 
 				// Adding all processes with no workerqueue entry
-				$processes = dba::p(
+				$processes = DBA::p(
 					"SELECT COUNT(*) AS `running` FROM `process` WHERE NOT EXISTS
 							(SELECT id FROM `workerqueue`
 							WHERE `workerqueue`.`pid` = `process`.`pid` AND NOT `done` AND `pid` != ?)",
 					getmypid()
 				);
 
-				if ($process = dba::fetch($processes)) {
+				if ($process = DBA::fetch($processes)) {
 					$listitem[0] = "0:".$process["running"];
 				}
-				dba::close($processes);
+				DBA::close($processes);
 
 				// Now adding all processes with workerqueue entries
-				$entries = dba::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` GROUP BY `priority`");
-				while ($entry = dba::fetch($entries)) {
-					$processes = dba::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done` WHERE `priority` = ?", $entry["priority"]);
-					if ($process = dba::fetch($processes)) {
+				$entries = DBA::p("SELECT COUNT(*) AS `entries`, `priority` FROM `workerqueue` WHERE NOT `done` AND `next_try` < ? GROUP BY `priority`", DateTimeFormat::utcNow());
+				while ($entry = DBA::fetch($entries)) {
+					$processes = DBA::p("SELECT COUNT(*) AS `running` FROM `process` INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` WHERE NOT `done` AND `next_try` < ? AND `priority` = ?",
+						DateTimeFormat::utcNow(), $entry["priority"]);
+					if ($process = DBA::fetch($processes)) {
 						$listitem[$entry["priority"]] = $entry["priority"].":".$process["running"]."/".$entry["entries"];
 					}
-					dba::close($processes);
+					DBA::close($processes);
 				}
-				dba::close($entries);
+				DBA::close($entries);
 
-				$intervals = array(1, 10, 60);
-				$jobs_per_minute = array();
+				$intervals = [1, 10, 60];
+				$jobs_per_minute = [];
 				foreach ($intervals as $interval) {
-					$jobs = dba::p("SELECT COUNT(*) AS `jobs` FROM `workerqueue` WHERE `done` AND `executed` > UTC_TIMESTAMP() - INTERVAL ".intval($interval)." MINUTE");
-					if ($job = dba::fetch($jobs)) {
+					$jobs = DBA::p("SELECT COUNT(*) AS `jobs` FROM `workerqueue` WHERE `done` AND `executed` > UTC_TIMESTAMP() - INTERVAL ".intval($interval)." MINUTE");
+					if ($job = DBA::fetch($jobs)) {
 						$jobs_per_minute[$interval] = number_format($job['jobs'] / $interval, 0);
 					}
-					dba::close($jobs);
+					DBA::close($jobs);
 				}
 				$processlist = ' - jpm: '.implode('/', $jobs_per_minute).' ('.implode(', ', $listitem).')';
 			}
 
 			$entries = self::totalEntries();
+			$deferred = self::deferredEntries();
 
 			if (Config::get("system", "worker_fastlane", false) && ($queues > 0) && ($entries > 0) && ($active >= $queues)) {
 				$top_priority = self::highestPriority();
 				$high_running = self::processWithPriorityActive($top_priority);
 
 				if (!$high_running && ($top_priority > PRIORITY_UNDEFINED) && ($top_priority < PRIORITY_NEGLIGIBLE)) {
-					logger("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", LOGGER_DEBUG);
+					Logger::log("There are jobs with priority ".$top_priority." waiting but none is executed. Open a fastlane.", Logger::DEBUG);
 					$queues = $active + 1;
 				}
 			}
 
-			logger("Load: ".$load."/".$maxsysload." - processes: ".$active."/".$entries.$processlist." - maximum: ".$queues."/".$maxqueues, LOGGER_DEBUG);
+			Logger::log("Load: " . $load ."/" . $maxsysload . " - processes: " . $deferred . "/" . $active . "/" . $entries . $processlist . " - maximum: " . $queues . "/" . $maxqueues, Logger::DEBUG);
 
 			// Are there fewer workers running as possible? Then fork a new one.
-			if (!Config::get("system", "worker_dont_fork") && ($queues > ($active + 1)) && ($entries > 1)) {
-				logger("Active workers: ".$active."/".$queues." Fork a new worker.", LOGGER_DEBUG);
-				self::spawnWorker();
+			if (!Config::get("system", "worker_dont_fork", false) && ($queues > ($active + 1)) && ($entries > 1)) {
+				Logger::log("Active workers: ".$active."/".$queues." Fork a new worker.", Logger::DEBUG);
+				if (Config::get('system', 'worker_daemon_mode', false)) {
+					self::IPCSetJobState(true);
+				} else {
+					self::spawnWorker();
+				}
 			}
 		}
 
-		return $active >= $queues;
+		// if there are too much worker, we don't spawn a new one.
+		if (Config::get('system', 'worker_daemon_mode', false) && ($active > $queues)) {
+			self::IPCSetJobState(false);
+		}
+
+		return $active > $queues;
 	}
 
 	/**
 	 * @brief Returns the number of active worker processes
 	 *
 	 * @return integer Number of active worker processes
+	 * @throws \Exception
 	 */
 	private static function activeWorkers()
 	{
-		$workers = dba::fetch_first("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'Worker.php'");
-
-		return $workers["processes"];
+		return DBA::count('process', ['command' => 'Worker.php']);
 	}
 
 	/**
@@ -691,26 +751,27 @@ class Worker
 	 *
 	 * @param string $highest_priority Returns the currently highest priority
 	 * @return bool We let pass a slower process than $highest_priority
+	 * @throws \Exception
 	 */
 	private static function passingSlow(&$highest_priority)
 	{
 		$highest_priority = 0;
 
-		$r = dba::p(
+		$r = DBA::p(
 			"SELECT `priority`
 				FROM `process`
 				INNER JOIN `workerqueue` ON `workerqueue`.`pid` = `process`.`pid` AND NOT `done`"
 		);
 
 		// No active processes at all? Fine
-		if (!DBM::is_result($r)) {
+		if (!DBA::isResult($r)) {
 			return false;
 		}
-		$priorities = array();
-		while ($line = dba::fetch($r)) {
+		$priorities = [];
+		while ($line = DBA::fetch($r)) {
 			$priorities[] = $line["priority"];
 		}
-		dba::close($r);
+		DBA::close($r);
 
 		// Should not happen
 		if (count($priorities) == 0) {
@@ -729,11 +790,11 @@ class Worker
 				++$high;
 			}
 		}
-		logger("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, LOGGER_DEBUG);
+		Logger::log("Highest priority: ".$highest_priority." Total processes: ".count($priorities)." Count high priority processes: ".$high, Logger::DEBUG);
 		$passing_slow = (($high/count($priorities)) > (2/3));
 
 		if ($passing_slow) {
-			logger("Passing slower processes than priority ".$highest_priority, LOGGER_DEBUG);
+			Logger::log("Passing slower processes than priority ".$highest_priority, Logger::DEBUG);
 		}
 		return $passing_slow;
 	}
@@ -743,6 +804,7 @@ class Worker
 	 *
 	 * @param boolean $passing_slow Returns if we had passed low priority processes
 	 * @return boolean Have we found something?
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function findWorkerProcesses(&$passing_slow)
 	{
@@ -759,43 +821,46 @@ class Worker
 		$queue_length = Config::get('system', 'worker_fetch_limit', 1);
 		$lower_job_limit = $worker_queues * $queue_length * 2;
 		$jobs = self::totalEntries();
+		$deferred = self::deferredEntries();
 
 		// Now do some magic
 		$exponent = 2;
 		$slope = $queue_length / pow($lower_job_limit, $exponent);
 		$limit = min($queue_length, ceil($slope * pow($jobs, $exponent)));
 
-		logger('Total: '.$jobs.' - Maximum: '.$queue_length.' - jobs per queue: '.$limit, LOGGER_DEBUG);
-
+		Logger::log('Deferred: ' . $deferred . ' - Total: ' . $jobs . ' - Maximum: ' . $queue_length . ' - jobs per queue: ' . $limit, Logger::DEBUG);
+		$ids = [];
 		if (self::passingSlow($highest_priority)) {
 			// Are there waiting processes with a higher priority than the currently highest?
-			$result = dba::select(
+			$result = DBA::select(
 				'workerqueue',
-				array('id'),
-				array("`executed` <= ? AND `priority` < ? AND NOT `done`", NULL_DATE, $highest_priority),
-				array('limit' => $limit, 'order' => array('priority', 'created'), 'only_query' => true)
+				['id'],
+				["`executed` <= ? AND `priority` < ? AND NOT `done` AND `next_try` < ?",
+				DBA::NULL_DATETIME, $highest_priority, DateTimeFormat::utcNow()],
+				['limit' => $limit, 'order' => ['priority', 'created']]
 			);
 
-			while ($id = dba::fetch($result)) {
+			while ($id = DBA::fetch($result)) {
 				$ids[] = $id["id"];
 			}
-			dba::close($result);
+			DBA::close($result);
 
 			$found = (count($ids) > 0);
 
 			if (!$found) {
 				// Give slower processes some processing time
-				$result = dba::select(
+				$result = DBA::select(
 					'workerqueue',
-					array('id'),
-					array("`executed` <= ? AND `priority` > ? AND NOT `done`", NULL_DATE, $highest_priority),
-					array('limit' => $limit, 'order' => array('priority', 'created'), 'only_query' => true)
+					['id'],
+					["`executed` <= ? AND `priority` > ? AND NOT `done` AND `next_try` < ?",
+					DBA::NULL_DATETIME, $highest_priority, DateTimeFormat::utcNow()],
+					['limit' => $limit, 'order' => ['priority', 'created']]
 				);
 
-				while ($id = dba::fetch($result)) {
+				while ($id = DBA::fetch($result)) {
 					$ids[] = $id["id"];
 				}
-				dba::close($result);
+				DBA::close($result);
 
 				$found = (count($ids) > 0);
 				$passing_slow = $found;
@@ -804,17 +869,18 @@ class Worker
 
 		// If there is no result (or we shouldn't pass lower processes) we check without priority limit
 		if (!$found) {
-			$result = dba::select(
+			$result = DBA::select(
 				'workerqueue',
-				array('id'),
-				array("`executed` <= ? AND NOT `done`", NULL_DATE),
-				array('limit' => $limit, 'order' => array('priority', 'created'), 'only_query' => true)
+				['id'],
+				["`executed` <= ? AND NOT `done` AND `next_try` < ?",
+				DBA::NULL_DATETIME, DateTimeFormat::utcNow()],
+				['limit' => $limit, 'order' => ['priority', 'created']]
 			);
 
-			while ($id = dba::fetch($result)) {
+			while ($id = DBA::fetch($result)) {
 				$ids[] = $id["id"];
 			}
-			dba::close($result);
+			DBA::close($result);
 
 			$found = (count($ids) > 0);
 		}
@@ -822,7 +888,7 @@ class Worker
 		if ($found) {
 			$condition = "`id` IN (".substr(str_repeat("?, ", count($ids)), 0, -2).") AND `pid` = 0 AND NOT `done`";
 			array_unshift($ids, $condition);
-			dba::update('workerqueue', array('executed' => datetime_convert(), 'pid' => $mypid), $ids);
+			DBA::update('workerqueue', ['executed' => DateTimeFormat::utcNow(), 'pid' => $mypid], $ids);
 		}
 
 		return $found;
@@ -833,21 +899,22 @@ class Worker
 	 *
 	 * @param boolean $passing_slow Returns if we had passed low priority processes
 	 * @return string SQL statement
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function workerProcess(&$passing_slow)
 	{
 		$stamp = (float)microtime(true);
 
 		// There can already be jobs for us in the queue.
-		$r = dba::select('workerqueue', array(), array('pid' => getmypid(), 'done' => false));
-		if (DBM::is_result($r)) {
+		$r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
+		if (DBA::isResult($r)) {
 			self::$db_duration += (microtime(true) - $stamp);
-			return dba::inArray($r);
+			return DBA::toArray($r);
 		}
-		dba::close($r);
+		DBA::close($r);
 
 		$stamp = (float)microtime(true);
-		if (!Lock::set('poller_worker_process')) {
+		if (!Lock::acquire('worker_process')) {
 			return false;
 		}
 		self::$lock_duration = (microtime(true) - $stamp);
@@ -856,11 +923,11 @@ class Worker
 		$found = self::findWorkerProcesses($passing_slow);
 		self::$db_duration += (microtime(true) - $stamp);
 
-		Lock::remove('poller_worker_process');
+		Lock::release('worker_process');
 
 		if ($found) {
-			$r = dba::select('workerqueue', array(), array('pid' => getmypid(), 'done' => false));
-			return dba::inArray($r);
+			$r = DBA::select('workerqueue', [], ['pid' => getmypid(), 'done' => false]);
+			return DBA::toArray($r);
 		}
 		return false;
 	}
@@ -868,17 +935,19 @@ class Worker
 	/**
 	 * @brief Removes a workerqueue entry from the current process
 	 * @return void
+	 * @throws \Exception
 	 */
 	public static function unclaimProcess()
 	{
 		$mypid = getmypid();
 
-		dba::update('workerqueue', array('executed' => NULL_DATE, 'pid' => 0), array('pid' => $mypid, 'done' => false));
+		DBA::update('workerqueue', ['executed' => DBA::NULL_DATETIME, 'pid' => 0], ['pid' => $mypid, 'done' => false]);
 	}
 
 	/**
 	 * @brief Call the front end worker
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function callWorker()
 	{
@@ -887,12 +956,13 @@ class Worker
 		}
 
 		$url = System::baseUrl()."/worker";
-		fetch_url($url, false, $redirects, 1);
+		Network::fetchUrl($url, false, $redirects, 1);
 	}
 
 	/**
 	 * @brief Call the front end worker if there aren't any active
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function executeIfIdle()
 	{
@@ -914,14 +984,14 @@ class Worker
 			if (self::tooMuchWorkers()) {
 				// Cleaning dead processes
 				self::killStaleWorkers();
-				get_app()->remove_inactive_processes();
+				Process::deleteInactive();
 
 				return;
 			}
 
 			self::runCron();
 
-			logger('Call worker', LOGGER_DEBUG);
+			Logger::log('Call worker', Logger::DEBUG);
 			self::spawnWorker();
 			return;
 		}
@@ -933,9 +1003,9 @@ class Worker
 
 		self::clearProcesses();
 
-		$workers = dba::fetch_first("SELECT COUNT(*) AS `processes` FROM `process` WHERE `command` = 'worker.php'");
+		$workers = self::activeWorkers();
 
-		if ($workers["processes"] == 0) {
+		if ($workers == 0) {
 			self::callWorker();
 		}
 	}
@@ -943,24 +1013,26 @@ class Worker
 	/**
 	 * @brief Removes long running worker processes
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	public static function clearProcesses()
 	{
 		$timeout = Config::get("system", "frontend_worker_timeout", 10);
 
 		/// @todo We should clean up the corresponding workerqueue entries as well
-		$condition = array("`created` < ? AND `command` = 'worker.php'",
-				datetime_convert('UTC', 'UTC', "now - ".$timeout." minutes"));
-		dba::delete('process', $condition);
+		$condition = ["`created` < ? AND `command` = 'worker.php'",
+				DateTimeFormat::utc("now - ".$timeout." minutes")];
+		DBA::delete('process', $condition);
 	}
 
 	/**
 	 * @brief Runs the cron processes
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
 	private static function runCron()
 	{
-		logger('Add cron entries', LOGGER_DEBUG);
+		Logger::log('Add cron entries', Logger::DEBUG);
 
 		// Check for spooled items
 		self::add(PRIORITY_HIGH, "SpoolPost");
@@ -968,20 +1040,28 @@ class Worker
 		// Run the cron job that calls all other jobs
 		self::add(PRIORITY_MEDIUM, "Cron");
 
-		// Run the cronhooks job separately from cron for being able to use a different timing
-		self::add(PRIORITY_MEDIUM, "CronHooks");
-
 		// Cleaning dead processes
 		self::killStaleWorkers();
 	}
 
 	/**
+	 * @brief Spawns a new worker
+	 * @param bool $do_cron
 	 * @return void
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 */
-	public static function spawnWorker()
+	public static function spawnWorker($do_cron = false)
 	{
-		$args = array("scripts/worker.php", "no_cron");
-		get_app()->proc_run($args);
+		$command = 'bin/worker.php';
+
+		$args = ['no_cron' => !$do_cron];
+
+		get_app()->proc_run($command, $args);
+
+		// after spawning we have to remove the flag.
+		if (Config::get('system', 'worker_daemon_mode', false)) {
+			self::IPCSetJobState(false);
+		}
 	}
 
 	/**
@@ -993,51 +1073,34 @@ class Worker
 	 * or: Worker::add(PRIORITY_HIGH, "Notifier", "drop", $drop_id);
 	 * or: Worker::add(array('priority' => PRIORITY_HIGH, 'dont_fork' => true), "CreateShadowEntry", $post_id);
 	 *
+	 * @return boolean "false" if proc_run couldn't be executed
+	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 	 * @note $cmd and string args are surrounded with ""
 	 *
 	 * @hooks 'proc_run'
-	 * 	array $arr
+	 *    array $arr
 	 *
-	 * @return boolean "false" if proc_run couldn't be executed
 	 */
 	public static function add($cmd)
 	{
-		$proc_args = func_get_args();
+		$args = func_get_args();
 
-		$args = array();
-		if (!count($proc_args)) {
+		if (!count($args)) {
 			return false;
 		}
 
-		// Preserve the first parameter
-		// It could contain a command, the priority or an parameter array
-		// If we use the parameter array we have to protect it from the following function
-		$run_parameter = array_shift($proc_args);
-
-		// expand any arrays
-		foreach ($proc_args as $arg) {
-			if (is_array($arg)) {
-				foreach ($arg as $n) {
-					$args[] = $n;
-				}
-			} else {
-				$args[] = $arg;
-			}
-		}
-
-		// Now we add the run parameters back to the array
-		array_unshift($args, $run_parameter);
+		$arr = ['args' => $args, 'run_cmd' => true];
 
-		$arr = array('args' => $args, 'run_cmd' => true);
-
-		call_hooks("proc_run", $arr);
+		Hook::callAll("proc_run", $arr);
 		if (!$arr['run_cmd'] || !count($args)) {
 			return true;
 		}
 
 		$priority = PRIORITY_MEDIUM;
-		$dont_fork = Config::get("system", "worker_dont_fork");
-		$created = datetime_convert();
+		$dont_fork = Config::get("system", "worker_dont_fork", false);
+		$created = DateTimeFormat::utcNow();
+
+		$run_parameter = array_shift($args);
 
 		if (is_int($run_parameter)) {
 			$priority = $run_parameter;
@@ -1053,19 +1116,16 @@ class Worker
 			}
 		}
 
-		$argv = $args;
-		array_shift($argv);
-
-		$parameters = json_encode($argv);
-		$found = dba::exists('workerqueue', array('parameter' => $parameters, 'done' => false));
+		$parameters = json_encode($args);
+		$found = DBA::exists('workerqueue', ['parameter' => $parameters, 'done' => false]);
 
 		// Quit if there was a database error - a precaution for the update process to 3.5.3
-		if (dba::errorNo() != 0) {
+		if (DBA::errorNo() != 0) {
 			return false;
 		}
 
 		if (!$found) {
-			dba::insert('workerqueue', array('parameter' => $parameters, 'created' => $created, 'priority' => $priority));
+			DBA::insert('workerqueue', ['parameter' => $parameters, 'created' => $created, 'priority' => $priority]);
 		}
 
 		// Should we quit and wait for the worker to be called as a cronjob?
@@ -1074,21 +1134,115 @@ class Worker
 		}
 
 		// If there is a lock then we don't have to check for too much worker
-		if (!Lock::set('poller_worker', 0)) {
+		if (!Lock::acquire('worker', 0)) {
 			return true;
 		}
 
 		// If there are already enough workers running, don't fork another one
 		$quit = self::tooMuchWorkers();
-		Lock::remove('poller_worker');
+		Lock::release('worker');
 
 		if ($quit) {
 			return true;
 		}
 
+		// We tell the daemon that a new job entry exists
+		if (Config::get('system', 'worker_daemon_mode', false)) {
+			// We don't have to set the IPC flag - this is done in "tooMuchWorkers"
+			return true;
+		}
+
 		// Now call the worker to execute the jobs that we just added to the queue
 		self::spawnWorker();
 
 		return true;
 	}
+
+	/**
+	 * Defers the current worker entry
+	 */
+	public static function defer()
+	{
+		if (empty(BaseObject::getApp()->queue)) {
+			return;
+		}
+
+		$queue = BaseObject::getApp()->queue;
+
+		$retrial = $queue['retrial'];
+		$id = $queue['id'];
+
+		if ($retrial > 14) {
+			Logger::log('Id ' . $id . ' had been tried 14 times. We stop now.', Logger::DEBUG);
+			return;
+		}
+
+		// Calculate the delay until the next trial
+		$delay = (($retrial + 3) ** 4) + (rand(1, 30) * ($retrial + 1));
+		$next = DateTimeFormat::utc('now + ' . $delay . ' seconds');
+
+		Logger::log('Defer execution ' . $retrial . ' of id ' . $id . ' to ' . $next, Logger::DEBUG);
+
+		$fields = ['retrial' => $retrial + 1, 'next_try' => $next, 'executed' => DBA::NULL_DATETIME, 'pid' => 0];
+		DBA::update('workerqueue', $fields, ['id' => $id]);
+	}
+
+	/**
+	 * Log active processes into the "process" table
+	 *
+	 * @brief Log active processes into the "process" table
+	 */
+	public static function startProcess()
+	{
+		$trace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 1);
+
+		$command = basename($trace[0]['file']);
+
+		Process::deleteInactive();
+
+		Process::insert($command);
+	}
+
+	/**
+	 * Remove the active process from the "process" table
+	 *
+	 * @brief Remove the active process from the "process" table
+	 * @return bool
+	 * @throws \Exception
+	 */
+	public static function endProcess()
+	{
+		return Process::deleteByPid();
+	}
+
+	/**
+	 * Set the flag if some job is waiting
+	 *
+	 * @brief Set the flag if some job is waiting
+	 * @param boolean $jobs Is there a waiting job?
+	 * @throws \Exception
+	 */
+	public static function IPCSetJobState($jobs)
+	{
+		DBA::update('worker-ipc', ['jobs' => $jobs], ['key' => 1], true);
+	}
+
+	/**
+	 * Checks if some worker job waits to be executed
+	 *
+	 * @brief Checks if some worker job waits to be executed
+	 * @return bool
+	 * @throws \Exception
+	 */
+	public static function IPCJobsExists()
+	{
+		$row = DBA::selectFirst('worker-ipc', ['jobs'], ['key' => 1]);
+
+		// When we don't have a row, no job is running
+		if (!DBA::isResult($row)) {
+			return false;
+		}
+
+		return (bool)$row['jobs'];
+	}
 }