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#
# Copyright (C) 2016 Codethink Limited
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library. If not, see <http://www.gnu.org/licenses/>.
#
# Authors:
# Tristan Van Berkom <tristan.vanberkom@codethink.co.uk>
# Jürg Billeter <juerg.billeter@codethink.co.uk>
# Local imports
from . import Queue, QueueStatus, QueueType
# A queue which pulls element artifacts
#
class PullQueue(Queue):
action_name = "Pull"
complete_name = "Pulled"
queue_type = QueueType.FETCH
def process(self, element):
# returns whether an artifact was downloaded or not
return element._pull()
def status(self, element):
# state of dependencies may have changed, recalculate element state
element._update_state()
if not element._is_required():
# Artifact is not currently required but it may be requested later.
# Keep it in the queue.
return QueueStatus.WAIT
if not element._can_query_cache():
return QueueStatus.WAIT
if element._pull_pending():
return QueueStatus.READY
else:
return QueueStatus.SKIP
def done(self, element, result, success):
if not success:
return False
element._pull_done()
# Element._pull() returns True if it downloaded an artifact,
# here we want to appear skipped if we did not download.
return result
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