How to use _assert_host_has_no_agent method in autotest

Best Python code snippet using autotest_python

monitor_db.py

Source:monitor_db.py

...458        for task_entry in task_entries:459            using_host = (task_entry.host is not None460                          and task_entry.status not in non_host_statuses)461            if using_host:462                self._assert_host_has_no_agent(task_entry)463    def _assert_host_has_no_agent(self, entry):464        """465        @param entry: a HostQueueEntry or a SpecialTask466        """467        if self.host_has_agent(entry.host):468            agent = tuple(self._host_agents.get(entry.host.id))[0]469            raise scheduler_lib.SchedulerError(470                    'While scheduling %s, host %s already has a host agent %s'471                    % (entry, entry.host, agent.task))472    def _get_agent_task_for_special_task(self, special_task):473        """474        Construct an AgentTask class to run the given SpecialTask and add it475        to this dispatcher.476        A special task is created through schedule_special_tasks, but only if477        the host doesn't already have an agent. This happens through478        add_agent_task. All special agent tasks are given a host on creation,479        and a Null hqe. To create a SpecialAgentTask object, you need a480        models.SpecialTask. If the SpecialTask used to create a SpecialAgentTask481        object contains a hqe it's passed on to the special agent task, which482        creates a HostQueueEntry and saves it as it's queue_entry.483        @param special_task: a models.SpecialTask instance484        @returns an AgentTask to run this SpecialTask485        """486        self._assert_host_has_no_agent(special_task)487        special_agent_task_classes = (prejob_task.CleanupTask,488                                      prejob_task.VerifyTask,489                                      prejob_task.RepairTask,490                                      prejob_task.ResetTask,491                                      prejob_task.ProvisionTask)492        for agent_task_class in special_agent_task_classes:493            if agent_task_class.TASK_TYPE == special_task.task:494                return agent_task_class(task=special_task)495        raise scheduler_lib.SchedulerError(496                'No AgentTask class for task', str(special_task))497    def _register_pidfiles(self, agent_tasks):498        for agent_task in agent_tasks:499            agent_task.register_necessary_pidfiles()500    def _recover_tasks(self, agent_tasks):...

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