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# Copyright 1999-2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
import time
from _emerge.PollScheduler import PollScheduler
class QueueScheduler(PollScheduler):
"""
Add instances of SequentialTaskQueue and then call run(). The
run() method returns when no tasks remain.
"""
def __init__(self, max_jobs=None, max_load=None):
PollScheduler.__init__(self)
if max_jobs is None:
max_jobs = 1
self._max_jobs = max_jobs
self._max_load = max_load
self._queues = []
self._schedule_listeners = []
def add(self, q):
self._queues.append(q)
def remove(self, q):
self._queues.remove(q)
def clear(self):
for q in self._queues:
q.clear()
def run(self, timeout=None):
start_time = None
timed_out = False
remaining_timeout = timeout
if timeout is not None:
start_time = time.time()
while self._schedule():
self._schedule_wait(timeout=remaining_timeout)
if timeout is not None:
elapsed_time = time.time() - start_time
if elapsed_time < 0:
# The system clock has changed such that start_time
# is now in the future, so just assume that the
# timeout has already elapsed.
timed_out = True
break
remaining_timeout = timeout - 1000 * elapsed_time
if remaining_timeout <= 0:
timed_out = True
break
if timeout is None or not timed_out:
while self._running_job_count():
self._schedule_wait(timeout=remaining_timeout)
if timeout is not None:
elapsed_time = time.time() - start_time
if elapsed_time < 0:
# The system clock has changed such that start_time
# is now in the future, so just assume that the
# timeout has already elapsed.
timed_out = True
break
remaining_timeout = timeout - 1000 * elapsed_time
if remaining_timeout <= 0:
timed_out = True
break
def _schedule_tasks(self):
"""
@rtype: bool
@returns: True if there may be remaining tasks to schedule,
False otherwise.
"""
if self._terminated_tasks:
return False
while self._can_add_job():
n = self._max_jobs - self._running_job_count()
if n < 1:
break
if not self._start_next_job(n):
return False
for q in self._queues:
if q:
return True
return False
def _running_job_count(self):
job_count = 0
for q in self._queues:
job_count += len(q.running_tasks)
self._jobs = job_count
return job_count
def _start_next_job(self, n=1):
started_count = 0
for q in self._queues:
initial_job_count = len(q.running_tasks)
q.schedule()
final_job_count = len(q.running_tasks)
if final_job_count > initial_job_count:
started_count += (final_job_count - initial_job_count)
if started_count >= n:
break
return started_count
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