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Quellcode für qiskit.providers.job

# This code is part of Qiskit.
#
# (C) Copyright IBM 2017.
#
# This code is licensed under the Apache License, Version 2.0. You may
# obtain a copy of this license in the LICENSE.txt file in the root directory
# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
#
# Any modifications or derivative works of this code must retain this
# copyright notice, and modified files need to carry a notice indicating
# that they have been altered from the originals.

"""Job abstract interface."""

import time
from abc import ABC, abstractmethod
from typing import Callable, Optional

from qiskit.exceptions import QiskitError
from qiskit.providers.backend import Backend
from qiskit.providers.exceptions import JobTimeoutError
from qiskit.providers.jobstatus import JOB_FINAL_STATES, JobStatus


[Doku]class Job: """Base common type for all versioned Job abstract classes. Note this class should not be inherited from directly, it is intended to be used for type checking. When implementing a provider you should use the versioned abstract classes as the parent class and not this class directly. """ version = 0
[Doku]class JobV1(Job, ABC): """Class to handle jobs This first version of the Backend abstract class is written to be mostly backwards compatible with the legacy providers interface. This was done to ease the transition for users and provider maintainers to the new versioned providers. Expect, future versions of this abstract class to change the data model and interface. """ version = 1 _async = True def __init__(self, backend: Optional[Backend], job_id: str, **kwargs) -> None: """Initializes the asynchronous job. Args: backend: the backend used to run the job. job_id: a unique id in the context of the backend used to run the job. kwargs: Any key value metadata to associate with this job. """ self._job_id = job_id self._backend = backend self.metadata = kwargs
[Doku] def job_id(self) -> str: """Return a unique id identifying the job.""" return self._job_id
[Doku] def backend(self) -> Backend: """Return the backend where this job was executed.""" if self._backend is None: raise QiskitError("The job does not have any backend.") return self._backend
[Doku] def done(self) -> bool: """Return whether the job has successfully run.""" return self.status() == JobStatus.DONE
[Doku] def running(self) -> bool: """Return whether the job is actively running.""" return self.status() == JobStatus.RUNNING
[Doku] def cancelled(self) -> bool: """Return whether the job has been cancelled.""" return self.status() == JobStatus.CANCELLED
[Doku] def in_final_state(self) -> bool: """Return whether the job is in a final job state such as ``DONE`` or ``ERROR``.""" return self.status() in JOB_FINAL_STATES
[Doku] def wait_for_final_state( self, timeout: Optional[float] = None, wait: float = 5, callback: Optional[Callable] = None ) -> None: """Poll the job status until it progresses to a final state such as ``DONE`` or ``ERROR``. Args: timeout: Seconds to wait for the job. If ``None``, wait indefinitely. wait: Seconds between queries. callback: Callback function invoked after each query. The following positional arguments are provided to the callback function: * job_id: Job ID * job_status: Status of the job from the last query * job: This BaseJob instance Note: different subclass might provide different arguments to the callback function. Raises: JobTimeoutError: If the job does not reach a final state before the specified timeout. """ if not self._async: return start_time = time.time() status = self.status() while status not in JOB_FINAL_STATES: elapsed_time = time.time() - start_time if timeout is not None and elapsed_time >= timeout: raise JobTimeoutError(f"Timeout while waiting for job {self.job_id()}.") if callback: callback(self.job_id(), status, self) time.sleep(wait) status = self.status() return
[Doku] @abstractmethod def submit(self): """Submit the job to the backend for execution.""" pass
[Doku] @abstractmethod def result(self): """Return the results of the job.""" pass
[Doku] def cancel(self): """Attempt to cancel the job.""" raise NotImplementedError
[Doku] @abstractmethod def status(self): """Return the status of the job, among the values of ``JobStatus``.""" pass