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Implement callback subscription logic in HistoryMonitor

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This commit is contained in:
Kristóf Tóth 2018-03-05 16:23:01 +01:00
parent 7dd2512300
commit 0a20cffa09
1 changed files with 15 additions and 1 deletions
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16
lib/tfw/components/history_monitor.py
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@ -17,17 +17,31 @@ class HistoryMonitor:
def __init__(self, histfile): def __init__(self, histfile):
self.histfile = histfile self.histfile = histfile
self._history = [] self._history = []
self._last_length = len(self._history)
self._callbacks = []
self.observer = Observer() self.observer = Observer()
self.observer.schedule(CallbackEventHandler(self._fetch_history), dirname(self.histfile)) self.observer.schedule(CallbackEventHandler(self._fetch_history,
self._invoke_callbacks),
dirname(self.histfile))
@property @property
def history(self): def history(self):
return self._history return self._history
@property
def callbacks(self):
return self._callbacks
def _fetch_history(self): def _fetch_history(self):
self._last_length = len(self._history)
with open(self.histfile, 'r') as ifile: with open(self.histfile, 'r') as ifile:
self._history = [line.rstrip() for line in ifile.readlines()] self._history = [line.rstrip() for line in ifile.readlines()]
def _invoke_callbacks(self):
if self._last_length < len(self._history):
for callback in self.callbacks:
callback(self.history)
def watch(self): def watch(self):
self.observer.start() self.observer.start()