def create():
def func(acc, x):
if acc is None:
acc = 0
return of(acc + x)
return xs.pipe(_.merge_scan(func))
def _files_in_path(credentials, path, retries):
def find_with_parent(parent, name):
return (list_folder(credentials, parent, name_filter=name, retries=retries) if parent else of([])).pipe(
first(), # There might be more than one file with the same name - we just take the first
map(lambda files: files[0] if len(files) else None)
)
return _path_elements(path).pipe(
merge_scan(find_with_parent, _root_folder)
)
def create_folder_with_path(credentials, path: str):
def create_if_missing(parent, name_file):
name = name_file[0]
file = name_file[1]
if file:
return of(file)
else:
return create_folder(credentials, parent, name)
return zip(
_path_elements(path),
_files_in_path(credentials, path),
).pipe(merge_scan(create_if_missing, _root_folder), last())
def test_merge_scan_concurrent(self):
accumulator_calls = [0]
def accumulator(acc, x):
accumulator_calls[0] += 1
return of(acc + x)
xs = from_list([1, 2, 3, 4, 5]).pipe(_.merge_scan(accumulator, seed=0))
results = TestSubscriber(xs).results()
assert len(results) == 6
assert results[0].value.kind == 'N' and results[0].value.value == 1
assert results[1].value.kind == 'N' and results[1].value.value == 1 + 2
assert results[2].value.kind == 'N' and results[
2].value.value == 1 + 2 + 3
assert results[3].value.kind == 'N' and results[
3].value.value == 1 + 2 + 3 + 4
assert results[4].value.kind == 'N' and results[
4].value.value == 1 + 2 + 3 + 4 + 5
assert results[5].value.kind == 'C'
assert accumulator_calls[
0] == 5 # Accumulator os not called more often than needed
def create():
return xs.pipe(_.merge_scan(lambda acc, x: of(acc + x), seed=seed))
def create():
return xs.pipe(_.merge_scan(seed, lambda acc, x: of(acc + x)))
def create():
def func(acc, x):
return of(acc + x)
return never().pipe(_.merge_scan(seed=seed, accumulator=func))
def create():
return never().pipe(_.merge_scan(lambda acc, x: of(acc + x)))