load tasks from database

def _load_tasks(self, project):
        '''load tasks from database'''
        task_queue = project.task_queue

        for task in self.taskdb.load_tasks(
                self.taskdb.ACTIVE, project.name, self.scheduler_task_fields
        ):
            taskid = task['taskid']
            _schedule = task.get('schedule', self.default_schedule)
            priority = _schedule.get('priority', self.default_schedule['priority'])
            exetime = _schedule.get('exetime', self.default_schedule['exetime'])
            task_queue.put(taskid, priority, exetime)
        project.task_loaded = True
        logger.debug('project: %s loaded %d tasks.', project.name, len(task_queue))

        if project not in self._cnt['all']:
            self._update_project_cnt(project.name)
        self._cnt['all'].value((project.name, 'pending'), len(project.task_queue))