1 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 # Use of this source code is governed by a BSD-style license that can be
3 # found in the LICENSE file.
10 def Collect(futures, except_pass=None):
11 '''Creates a Future which returns a list of results from each Future in
12 |futures|. |except_pass| should be one or more exceptions to ignore when
13 calling Get on the futures.
19 resolved.append(f.Get())
20 # "except None" will simply not catch any errors
24 return Future(callback=resolve)
28 '''Stores a value, error, or callback to be used later.
30 def __init__(self, value=_no_value, callback=None, exc_info=None):
32 self._callback = callback
33 self._exc_info = exc_info
34 if (self._value is _no_value and
35 self._callback is None and
36 self._exc_info is None):
37 raise ValueError('Must have either a value, error, or callback.')
40 '''Gets the stored value, error, or callback contents.
42 if self._value is not _no_value:
44 if self._exc_info is not None:
47 self._value = self._callback()
50 self._exc_info = sys.exc_info()
54 exc_info = self._exc_info
55 raise exc_info[0], exc_info[1], exc_info[2]