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109 lines
3.6 KiB
Python
109 lines
3.6 KiB
Python
4 years ago
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from __future__ import absolute_import
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from apscheduler.jobstores.base import BaseJobStore, JobLookupError, ConflictingIdError
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from apscheduler.util import datetime_to_utc_timestamp
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class MemoryJobStore(BaseJobStore):
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"""
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Stores jobs in an array in RAM. Provides no persistence support.
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Plugin alias: ``memory``
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"""
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def __init__(self):
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super(MemoryJobStore, self).__init__()
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# list of (job, timestamp), sorted by next_run_time and job id (ascending)
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self._jobs = []
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self._jobs_index = {} # id -> (job, timestamp) lookup table
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def lookup_job(self, job_id):
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return self._jobs_index.get(job_id, (None, None))[0]
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def get_due_jobs(self, now):
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now_timestamp = datetime_to_utc_timestamp(now)
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pending = []
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for job, timestamp in self._jobs:
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if timestamp is None or timestamp > now_timestamp:
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break
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pending.append(job)
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return pending
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def get_next_run_time(self):
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return self._jobs[0][0].next_run_time if self._jobs else None
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def get_all_jobs(self):
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return [j[0] for j in self._jobs]
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def add_job(self, job):
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if job.id in self._jobs_index:
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raise ConflictingIdError(job.id)
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timestamp = datetime_to_utc_timestamp(job.next_run_time)
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index = self._get_job_index(timestamp, job.id)
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self._jobs.insert(index, (job, timestamp))
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self._jobs_index[job.id] = (job, timestamp)
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def update_job(self, job):
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old_job, old_timestamp = self._jobs_index.get(job.id, (None, None))
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if old_job is None:
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raise JobLookupError(job.id)
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# If the next run time has not changed, simply replace the job in its present index.
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# Otherwise, reinsert the job to the list to preserve the ordering.
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old_index = self._get_job_index(old_timestamp, old_job.id)
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new_timestamp = datetime_to_utc_timestamp(job.next_run_time)
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if old_timestamp == new_timestamp:
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self._jobs[old_index] = (job, new_timestamp)
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else:
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del self._jobs[old_index]
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new_index = self._get_job_index(new_timestamp, job.id)
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self._jobs.insert(new_index, (job, new_timestamp))
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self._jobs_index[old_job.id] = (job, new_timestamp)
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def remove_job(self, job_id):
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job, timestamp = self._jobs_index.get(job_id, (None, None))
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if job is None:
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raise JobLookupError(job_id)
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index = self._get_job_index(timestamp, job_id)
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del self._jobs[index]
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del self._jobs_index[job.id]
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def remove_all_jobs(self):
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self._jobs = []
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self._jobs_index = {}
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def shutdown(self):
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self.remove_all_jobs()
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def _get_job_index(self, timestamp, job_id):
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"""
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Returns the index of the given job, or if it's not found, the index where the job should be
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inserted based on the given timestamp.
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:type timestamp: int
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:type job_id: str
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"""
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lo, hi = 0, len(self._jobs)
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timestamp = float('inf') if timestamp is None else timestamp
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while lo < hi:
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mid = (lo + hi) // 2
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mid_job, mid_timestamp = self._jobs[mid]
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mid_timestamp = float('inf') if mid_timestamp is None else mid_timestamp
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if mid_timestamp > timestamp:
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hi = mid
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elif mid_timestamp < timestamp:
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lo = mid + 1
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elif mid_job.id > job_id:
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hi = mid
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elif mid_job.id < job_id:
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lo = mid + 1
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else:
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return mid
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return lo
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