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# Copyright 2015, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Utilities helpful for working with the base layer of RPC Framework."""
import collections
import threading
from _framework.base import interfaces
class _ServicedSubscription(
collections.namedtuple('_ServicedSubscription', ['category', 'ingestor']),
interfaces.ServicedSubscription):
"""See interfaces.ServicedSubscription for specification."""
_NONE_SUBSCRIPTION = _ServicedSubscription(interfaces.NONE, None)
_TERMINATION_ONLY_SUBSCRIPTION = _ServicedSubscription(
interfaces.TERMINATION_ONLY, None)
def none_serviced_subscription():
"""Creates a "none" interfaces.ServicedSubscription object.
Returns:
An interfaces.ServicedSubscription indicating no subscription to an
operation's results (such as would be the case for a fire-and-forget
operation invocation).
"""
return _NONE_SUBSCRIPTION
def termination_only_serviced_subscription():
"""Creates a "termination only" interfaces.ServicedSubscription object.
Returns:
An interfaces.ServicedSubscription indicating that the front-side customer
is interested only in the overall termination outcome of the operation
(such as completion or expiration) and would ignore the actual results of
the operation.
"""
return _TERMINATION_ONLY_SUBSCRIPTION
def full_serviced_subscription(ingestor):
"""Creates a "full" interfaces.ServicedSubscription object.
Args:
ingestor: A ServicedIngestor.
Returns:
A ServicedSubscription object indicating a full subscription.
"""
return _ServicedSubscription(interfaces.FULL, ingestor)
def wait_for_idle(end):
"""Waits for an interfaces.End to complete all operations.
Args:
end: Any interfaces.End.
"""
event = threading.Event()
end.add_idle_action(event.set)
event.wait()
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