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How to use _can_start_agent method in autotest

Best Python code snippet using autotest_python

monitor_db.py

Source:monitor_db.py

...771                    # tasks against the host, and it must be set772                    # in addition to is_active, is_complete and success.773                    agent.task.epilog()774                    agent.task.abort()775    def _can_start_agent(self, agent, have_reached_limit):776        # always allow zero-process agents to run777        if agent.task.num_processes == 0:778            return True779        # don't allow any nonzero-process agents to run after we've reached a780        # limit (this avoids starvation of many-process agents)781        if have_reached_limit:782            return False783        # total process throttling784        max_runnable_processes = _drone_manager.max_runnable_processes(785                agent.task.owner_username,786                agent.task.get_drone_hostnames_allowed())787        if agent.task.num_processes > max_runnable_processes:788            return False789        return True790    def _handle_agents(self):791        """792        Handles agents of the dispatcher.793        Appropriate Agents are added to the dispatcher through794        _schedule_running_host_queue_entries. These agents each795        have a task. This method runs the agents task through796        agent.tick() leading to:797            agent.start798                prolog -> AgentTasks prolog799                          For each queue entry:800                            sets host status/status to Running801                            set started_on in afe_host_queue_entries802                run    -> AgentTasks run803                          Creates PidfileRunMonitor804                          Queues the autoserv command line for this AgentTask805                          via the drone manager. These commands are executed806                          through the drone managers execute actions.807                poll   -> AgentTasks/BaseAgentTask poll808                          checks the monitors exit_code.809                          Executes epilog if task is finished.810                          Executes AgentTasks _finish_task811                finish_task is usually responsible for setting the status812                of the HQE/host, and updating it's active and complete fileds.813            agent.is_done814                Removed the agent from the dispatchers _agents queue.815                Is_done checks the finished bit on the agent, that is816                set based on the Agents task. During the agents poll817                we check to see if the monitor process has exited in818                it's finish method, and set the success member of the819                task based on this exit code.820        """821        num_started_this_tick = 0822        num_finished_this_tick = 0823        have_reached_limit = False824        # iterate over copy, so we can remove agents during iteration825        logging.debug('Handling %d Agents', len(self._agents))826        for agent in list(self._agents):827            self._log_extra_msg('Processing Agent with Host Ids: %s and '828                                'queue_entry ids:%s' % (agent.host_ids,829                                agent.queue_entry_ids))830            if not agent.started:831                if not self._can_start_agent(agent, have_reached_limit):832                    have_reached_limit = True833                    logging.debug('Reached Limit of allowed running Agents.')834                    continue835                num_started_this_tick += agent.task.num_processes836                self._log_extra_msg('Starting Agent')837            agent.tick()838            self._log_extra_msg('Agent tick completed.')839            if agent.is_done():840                num_finished_this_tick += agent.task.num_processes841                self._log_extra_msg("Agent finished")842                self.remove_agent(agent)843        autotest_stats.Gauge('scheduler.jobs_per_tick').send(844                'agents_started', num_started_this_tick)845        autotest_stats.Gauge('scheduler.jobs_per_tick').send(...

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