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# Copyright 2021 The Duet Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import duet
import duet.impl as impl
class CompleteOnFlush(duet.BufferedFuture):
def __init__(self):
super().__init__()
self.flushed = False
def flush(self):
self.flushed = True
self.set_result(None)
def make_task(future: duet.AwaitableFuture) -> impl.Task:
"""Make a task from the given future.
We advance the task once, which just starts the generator and yields the
future itself.
"""
task = impl.Task(future, impl.Scheduler(), None)
task.advance()
return task
class TestReadySet:
def test_get_all_returns_all_ready_tasks(self):
task1 = make_task(duet.completed_future(None))
task2 = make_task(duet.completed_future(None))
task3 = make_task(duet.AwaitableFuture())
task4 = make_task(duet.completed_future(None))
rs = impl.ReadySet()
rs.register(task1)
rs.register(task2)
rs.register(task3)
rs.register(task4)
tasks = rs.get_all()
assert tasks == [task1, task2, task4]
def test_task_added_at_most_once(self):
task = make_task(duet.completed_future(None))
rs = impl.ReadySet()
rs.register(task)
rs.register(task)
tasks = rs.get_all()
assert tasks == [task]
def test_futures_flushed_if_no_task_ready(self):
future = CompleteOnFlush()
task = make_task(future)
rs = impl.ReadySet()
rs.register(task)
tasks = rs.get_all()
assert tasks == [task]
assert future.flushed
def test_futures_not_flushed_if_tasks_ready(self):
future = CompleteOnFlush()
task1 = make_task(future)
task2 = make_task(duet.completed_future(None))
rs = impl.ReadySet()
rs.register(task1)
rs.register(task2)
tasks = rs.get_all()
assert tasks == [task2]
assert not future.flushed
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