def __init__(self, backend: Backend) -> None:
self.name = backend.name()
self.n_qubits = backend.configuration().n_qubits
self.operational = backend.status().operational
self.simulator = backend.configuration().simulator
self.pending_jobs = backend.status().pending_jobs
self.active_jobs = backend.job_limit().active_jobs
self.maximum_jobs = backend.job_limit().maximum_jobs
self.status_msg = backend.status().status_msg
# only available by real QPUs
try:
self.quantum_volume = backend.configuration().quantum_volume
except AttributeError:
pass
def try_to_enter(self, backend_name:str, backend:Backend) -> bool:
"""Try to enter the lock of the backend
Args:
backend_name (str)
backend (Backend)
Returns:
bool: True, if successfully entered the lock. False, otherwise
"""
try:
lock = self._locks[backend_name]
counter = self._counters[backend_name]
except KeyError:
lock = Lock()
counter = 0
self._locks[backend_name] = lock
self._counters[backend_name] = counter
with lock:
limit = backend.job_limit()
self._log.debug(f"Backend: {backend_name} Counter:{counter} Active_Jobs:{limit.active_jobs} Maximum_jobs:{limit.maximum_jobs}")
if limit.active_jobs < limit.maximum_jobs:
if counter < limit.maximum_jobs:
self._counters[backend_name] += 1
return True
return False