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1 | #!/usr/bin/python |
2 | ############################################################################### | |
3 | # # | |
4 | # Cappie # | |
5 | # Copyright (C) 2010 Michael Tremer # | |
6 | # # | |
7 | # This program is free software: you can redistribute it and/or modify # | |
8 | # it under the terms of the GNU General Public License as published by # | |
9 | # the Free Software Foundation, either version 3 of the License, or # | |
10 | # (at your option) any later version. # | |
11 | # # | |
12 | # This program is distributed in the hope that it will be useful, # | |
13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of # | |
14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # | |
15 | # GNU General Public License for more details. # | |
16 | # # | |
17 | # You should have received a copy of the GNU General Public License # | |
18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. # | |
19 | # # | |
20 | ############################################################################### | |
21 | ||
22 | import time | |
23 | ||
24 | from threading import Thread | |
25 | ||
af1f4801 | 26 | from database import Database |
53478050 MT |
27 | from errors import * |
28 | ||
29 | class Queue(Thread): | |
30 | heartbeat = 1.0 | |
31 | maxitems = 100 | |
32 | ||
33 | def __init__(self, log): | |
34 | Thread.__init__(self) | |
35 | ||
36 | self.log = log | |
37 | ||
38 | self.__running = True | |
39 | self.__queue = [] | |
40 | ||
af1f4801 MT |
41 | self.db = Database(log) |
42 | ||
53478050 MT |
43 | def __len__(self): |
44 | return self.length | |
45 | ||
46 | def add(self, event): | |
47 | if self.length > self.maxitems: | |
48 | raise QueueFullError, "Cannot queue new event." | |
49 | ||
50 | self.__queue.append(event) | |
51 | ||
52 | @property | |
53 | def length(self): | |
54 | return len(self.__queue) | |
55 | ||
56 | def run(self): | |
57 | self.log.debug("Started event queue") | |
58 | ||
af1f4801 MT |
59 | self.db.open() |
60 | ||
53478050 MT |
61 | while self.__running or self.__queue: |
62 | if not self.__queue: | |
63 | #self.log.debug("Queue sleeping for %s seconds" % self.heartbeat) | |
64 | time.sleep(self.heartbeat) | |
65 | continue | |
66 | ||
67 | event = self.__queue.pop(0) | |
68 | self.log.debug("Processing queue event: %s" % event) | |
69 | try: | |
70 | event.run() | |
71 | except EventException, e: | |
72 | self.log.error("Catched event exception: %s" % e) | |
73 | ||
af1f4801 MT |
74 | self.db.close() |
75 | ||
53478050 MT |
76 | def shutdown(self): |
77 | self.__running = False | |
78 | self.log.debug("Shutting down queue") | |
79 | self.log.debug("%d events in queue left" % len(self.__queue)) | |
80 | ||
81 | # Wait until queue handled all events | |
82 | self.join() |