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# Copyright 2015 Canonical, Ltd. # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as # published by the Free Software Foundation, either version 3 of the # License, or (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. from abc import ABC, abstractmethod import logging import os log = logging.getLogger("subiquitycore.controller") def view(func): n = func.__name__ def f(self, *args, **kw): m = getattr(self, n) self.view_stack.append((m, args, kw)) return func(self, *args, **kw) return f class BaseController(ABC): """Base class for controllers.""" signals = [] def __init__(self, common): self.ui = common['ui'] self.signal = common['signal'] self.opts = common['opts'] self.loop = common['loop'] self.prober = common['prober'] self.controllers = common['controllers'] self.pool = common['pool'] self.view_stack = [] def register_signals(self): """Defines signals associated with controller from model.""" signals = [] for sig, cb in self.signals: signals.append((sig, getattr(self, cb))) self.signal.connect_signals(signals) def prev_view(self): self.view_stack.pop() meth, args, kw = self.view_stack.pop() meth(*args, **kw) def run_in_bg(self, func, callback): """Run func() in a thread and call callback on UI thread. callback will be passed a concurrent.futures.Future containing the result of func(). The result of callback is discarded. Any exception will be logged. """ fut = self.pool.submit(func) def in_main_thread(ignored): try: callback(fut) except: log.exception("callback %s after calling %s failed", callback, func) pipe = self.loop.watch_pipe(in_main_thread) def in_random_thread(ignored): os.write(pipe, b'x') fut.add_done_callback(in_random_thread) @abstractmethod def cancel(self): pass @abstractmethod def default(self): pass
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