projects / oddments / cappie.git / blame
| Commit | Line | Data |
|---|---|---|
| 53478050 MT |
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 | ||
| 26 | from errors import * | |
| 27 | ||
| 28 | class Queue(Thread): | |
| 29 | heartbeat = 1.0 | |
| 30 | maxitems = 100 | |
| 31 | ||
| 32 | def __init__(self, log): | |
| 33 | Thread.__init__(self) | |
| 34 | ||
| 35 | self.log = log | |
| 36 | ||
| 37 | self.__running = True | |
| 38 | self.__queue = [] | |
| 39 | ||
| 40 | def __len__(self): | |
| 41 | return self.length | |
| 42 | ||
| 43 | def add(self, event): | |
| 44 | if self.length > self.maxitems: | |
| 45 | raise QueueFullError, "Cannot queue new event." | |
| 46 | ||
| 47 | self.__queue.append(event) | |
| 48 | ||
| 49 | @property | |
| 50 | def length(self): | |
| 51 | return len(self.__queue) | |
| 52 | ||
| 53 | def run(self): | |
| 54 | self.log.debug("Started event queue") | |
| 55 | ||
| 56 | while self.__running or self.__queue: | |
| 57 | if not self.__queue: | |
| 58 | #self.log.debug("Queue sleeping for %s seconds" % self.heartbeat) | |
| 59 | time.sleep(self.heartbeat) | |
| 60 | continue | |
| 61 | ||
| 62 | event = self.__queue.pop(0) | |
| 63 | self.log.debug("Processing queue event: %s" % event) | |
| 64 | try: | |
| 65 | event.run() | |
| 66 | except EventException, e: | |
| 67 | self.log.error("Catched event exception: %s" % e) | |
| 68 | ||
| 69 | def shutdown(self): | |
| 70 | self.__running = False | |
| 71 | self.log.debug("Shutting down queue") | |
| 72 | self.log.debug("%d events in queue left" % len(self.__queue)) | |
| 73 | ||
| 74 | # Wait until queue handled all events | |
| 75 | self.join() |