Configuration/ProcessConfiguration.php
protected function sortDependencies(array $dependencies)
    {
        if (\count($dependencies) <= 1) {
            return $dependencies;
        }

        try {
            $this->checkCircularDependencies();
        } catch (CircularProcessException $e) {
            // Skipping the sort phase, it will throw later, on runtime
            return $dependencies;
        }

        /** @var int $midOffset */
        $midOffset = \count($dependencies) / 2;
        $midTaskCode = $dependencies[$midOffset];
        $midTask = $this->getTaskConfiguration($midTaskCode);

        $previousTasks = [];
        $independentTasks = [];
        $nextTasks = [];

        foreach ($dependencies as $taskCode) {
            if ($taskCode !== $midTaskCode) {
                $task = $this->getTaskConfiguration($taskCode);

                if ($midTask->hasAncestor($task)) {
                    $previousTasks[] = $taskCode;
                } elseif ($midTask->hasDescendant($task)) {
                    $nextTasks[] = $taskCode;
                } else {
                    $independentTasks[] = $taskCode;
                }
            }
        }

        $previousTasks = $this->sortDependencies($previousTasks);
        $independentTasks = $this->sortDependencies($independentTasks);
        $nextTasks = $this->sortDependencies($nextTasks);

        return array_merge($previousTasks, [$midTaskCode], $independentTasks, $nextTasks);
    }
protected function sortDependencies(array $dependencies)
    {
        if (\count($dependencies) <= 1) {
            return $dependencies;
        }

        try {
            $this->checkCircularDependencies();
        } catch (CircularProcessException $e) {
            // Skipping the sort phase, it will throw later, on runtime
            return $dependencies;
        }

        /** @var int $midOffset */
        $midOffset = \count($dependencies) / 2;
        $midTaskCode = $dependencies[$midOffset];
        $midTask = $this->getTaskConfiguration($midTaskCode);

        $previousTasks = [];
        $independentTasks = [];
        $nextTasks = [];

        foreach ($dependencies as $taskCode) {
            if ($taskCode !== $midTaskCode) {
                $task = $this->getTaskConfiguration($taskCode);

                if ($midTask->hasAncestor($task)) {
                    $previousTasks[] = $taskCode;
                } elseif ($midTask->hasDescendant($task)) {
                    $nextTasks[] = $taskCode;
                } else {
                    $independentTasks[] = $taskCode;
                }
            }
        }

        $previousTasks = $this->sortDependencies($previousTasks);
        $independentTasks = $this->sortDependencies($independentTasks);
        $nextTasks = $this->sortDependencies($nextTasks);

        return array_merge($previousTasks, [$midTaskCode], $independentTasks, $nextTasks);
    }
Sort the tasks by dependencies

@param array $dependencies

@throws \CleverAge\ProcessBundle\Exception\MissingTaskConfigurationException

@return array