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# -*- coding: utf-8 -*-
#
# QBzr - Qt frontend to Bazaar commands
# Copyright (C) 2010 QBzr Developers
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
from PyQt4 import QtCore
import time
from collections import defaultdict
from functools import wraps
"""Decorators for debugging and maybe main work mode."""
def print_in_out(unbound):
"""Decorator to print input arguments and return value of the function."""
def _run(*args, **kwargs):
from breezy.trace import mutter
a = ','.join(repr(i) for i in args)
b = ','.join('%s=%r' % (i,j) for (i,j) in kwargs.items())
if a and b:
a = a + ',' + b
else:
a = a or b
func_name = unbound.__name__
mutter('Called %s(%s)' % (func_name, a))
result = unbound(*args, **kwargs)
mutter('%s returned %r' % (func_name, result))
return result
return _run
class LazyCall(object):
def __init__(self, millisec, func, callback=None):
self.func = func
self.millisec = millisec
self.callback = callback
self._last_scheduled_at = 0
def call(self, *args, **kargs):
self._func = lambda:self.func(*args, **kargs)
if self._last_scheduled_at == 0:
QtCore.QTimer.singleShot(self.millisec, self._exec)
self._last_scheduled_at = time.time()
def _exec(self):
elapsed = (time.time() - self._last_scheduled_at) * 1000
if elapsed < self.millisec:
# Retry
QtCore.QTimer.singleShot(self.millisec - elapsed, self._exec)
return
last_executed_at = self._last_scheduled_at
ret = self._func()
has_next = last_executed_at != self._last_scheduled_at
if self.callback:
self.callback(ret, has_next)
if has_next:
# One more call if there was another request when executing proc
QtCore.QTimer.singleShot(self.millisec, self._exec)
return
self._last_scheduled_at = 0
def lazy_call(millisec, per_instance=False):
"""
Decorator to delay function call.
Specified function will called after waiting `millisec`,
if there are multiple call while waiting, only last one will be done.
"""
def _lazy_call(function):
if per_instance:
_instances = defaultdict(lambda:LazyCall(millisec, function))
def __lazy_call(*args, **kwargs):
key = hash(args[0])
caller = _instances[key]
if not caller.callback:
def cleanup(ret, has_next):
if not has_next:
del _instances[key]
caller.callback = cleanup
caller.call(*args, **kwargs)
else:
caller = LazyCall(millisec, function)
def __lazy_call(*args, **kwargs):
caller.call(*args, **kwargs)
return __lazy_call
return _lazy_call
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