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# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
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, main=True, max_jobs=None, max_load=None):
PollScheduler.__init__(self, main=main)
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):
timeout_callback = None
if timeout is not None:
def timeout_callback():
timeout_callback.timed_out = True
return False
timeout_callback.timed_out = False
timeout_callback.timeout_id = self.sched_iface.timeout_add(
timeout, timeout_callback)
term_check_id = self.sched_iface.idle_add(self._termination_check)
try:
while not (timeout_callback is not None and
timeout_callback.timed_out):
# We don't have any callbacks to trigger _schedule(),
# so we have to call it explicitly here.
self._schedule()
if self._keep_scheduling():
self.sched_iface.iteration()
else:
break
while self._is_work_scheduled() and \
not (timeout_callback is not None and
timeout_callback.timed_out):
self.sched_iface.iteration()
finally:
self.sched_iface.source_remove(term_check_id)
if timeout_callback is not None:
self.sched_iface.unregister(timeout_callback.timeout_id)
def _schedule_tasks(self):
"""
@rtype: bool
@return: True if there may be remaining tasks to schedule,
False otherwise.
"""
if self._terminated_tasks:
return
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
def _keep_scheduling(self):
return not self._terminated_tasks and any(self._queues)
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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