1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
# Copyright (c) 2010 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.
class PersistentPatchCollectionDelegate:
def collection_name(self):
raise NotImplementedError, "subclasses must implement"
def fetch_potential_patch_ids(self):
raise NotImplementedError, "subclasses must implement"
def status_server(self):
raise NotImplementedError, "subclasses must implement"
def is_terminal_status(self, status):
raise NotImplementedError, "subclasses must implement"
class PersistentPatchCollection:
def __init__(self, delegate):
self._delegate = delegate
self._name = self._delegate.collection_name()
self._status = self._delegate.status_server()
self._status_cache = {}
def _cached_status(self, patch_id):
cached = self._status_cache.get(patch_id)
if cached:
return cached
status = self._status.patch_status(self._name, patch_id)
if status and self._delegate.is_terminal_status(status):
self._status_cache[patch_id] = status
return status
def _is_active_patch_id(self, patch_id):
"""Active patches are patches waiting to be processed from this collection."""
status = self._cached_status(patch_id)
return not status or not self._delegate.is_terminal_status(status)
def _fetch_active_patch_ids(self):
patch_ids = self._delegate.fetch_potential_patch_ids()
return filter(lambda patch_id: self._is_active_patch_id(patch_id), patch_ids)
def next(self):
# Note: We only fetch all the ids so we can post them back to the server.
# This will go away once we have a feeder queue and all other queues are
# just pulling their next work item from the server.
patch_ids = self._fetch_active_patch_ids()
# FIXME: We're assuming self._name is a valid queue-name.
self._status.update_work_items(self._name, patch_ids)
if not patch_ids:
return None
return patch_ids[0]
|
