Source Code for Module buildbot.changes.base

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13  # 
14  # Copyright Buildbot Team Members 
15   
16  from zope.interface import implements 
17  from twisted.application import service 
18  from twisted.internet import defer, task, reactor 
19  from twisted.python import log 
20   
21  from buildbot.interfaces import IChangeSource 
22  from buildbot import util 
23   
24 -class ChangeSource(service.Service, util.ComparableMixin): 
25      implements(IChangeSource) 
26   
27      master = None 
28      "if C{self.running} is true, then C{cs.master} points to the buildmaster." 
29   
30 -    def describe(self): 
31          pass 
32   
33 -class PollingChangeSource(ChangeSource): 
34      """ 
35      Utility subclass for ChangeSources that use some kind of periodic polling 
36      operation.  Subclasses should define C{poll} and set C{self.pollInterval}. 
37      The rest is taken care of. 
38      """ 
39   
40      pollInterval = 60 
41      "time (in seconds) between calls to C{poll}" 
42   
43      _loop = None 
44   
45 -    def poll(self): 
46          """ 
47          Perform the polling operation, and return a deferred that will fire 
48          when the operation is complete.  Failures will be logged, but the 
49          method will be called again after C{pollInterval} seconds. 
50          """ 
51   
52 -    def startService(self): 
53          ChangeSource.startService(self) 
54          def do_poll(): 
55              d = defer.maybeDeferred(self.poll) 
56              d.addErrback(log.err, 'while polling for changes') 
57              return d 
58   
59          # delay starting the loop until the reactor is running, and do not 
60          # run it immediately - if services are still starting up, they may 
61          # miss an initial flood of changes 
62          def start_loop(): 
63              self._loop = task.LoopingCall(do_poll) 
64              self._loop.start(self.pollInterval, now=False) 
65          reactor.callWhenRunning(start_loop) 
66   
67 -    def stopService(self): 
68          if self._loop and self._loop.running: 
69              self._loop.stop() 
70          return ChangeSource.stopService(self) 
71