115 lines
4.3 KiB
Cython
115 lines
4.3 KiB
Cython
# Copyright (C) 2007-2014 various contributors (see AUTHORS)
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#
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# This file is part of Python-EFL.
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#
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# Python-EFL is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 3 of the License, or (at your option) any later version.
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#
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# Python-EFL is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this Python-EFL. If not, see <http://www.gnu.org/licenses/>.
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cdef class Poller(Eo):
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"""
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Ecore poller provides infrastructure for the creation of pollers. Pollers
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are, in essence, callbacks that share a single timer per type. Because not
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all pollers need to be called at the same frequency the user may specify the
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frequency in ticks(each expiration of the shared timer is called a tick, in
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ecore poller parlance) for each added poller. Ecore pollers should only be
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used when the poller doesn't have specific requirements on the exact times
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to poll.
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This architecture means that the main loop is only woken up once to handle
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all pollers of that type, this will save power as the CPU has more of a
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chance to go into a low power state the longer it is asleep for, so this
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should be used in situations where power usage is a concern.
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For now only 1 core poller type is supported: ECORE_POLLER_CORE, the default
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interval for ECORE_POLLER_CORE is 0.125(or 1/8th) second.
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The `interval` must be between 1 and 32768 inclusive, and must be a power of
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2 (i.e. 1, 2, 4, 8, 16, ... 16384, 32768). The exact tick in which `func`
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will be called is undefined, as only the interval between calls can be
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defined. Ecore will endeavor to keep pollers synchronized and to call as
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many in 1 wakeup event as possible. If `interval` is not a power of two, the
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closest power of 2 greater than `interval` will be used.
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When the poller `func` is called, it must return a value of either
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ECORE_CALLBACK_RENEW(or True) or ECORE_CALLBACK_CANCEL(or False). If it
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returns 1, it will be called again at the next tick, or if it returns
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0 it will be deleted automatically making any references/handles for it
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invalid.
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Example::
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def poller_cb():
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print("Poller")
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return True
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ecore.Poller(4, poller_cb)
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:param interval: The poll interval
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:type interval: int
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:param func: The function to call at every interval
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:type func: callable
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:param poll_type: The ticker type to attach the poller to. Must be ECORE_POLLER_CORE
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:type poll_type: Ecore_Poll_Type
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.. versionadded:: 1.8
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"""
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def __init__(self, int interval, func, pol_type=0, *args, **kargs):
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if not callable(func):
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raise TypeError("Parameter 'func' must be callable")
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self.func = func
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self.args = args
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self.kargs = kargs
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self._set_obj(ecore_poller_add(pol_type, interval, _ecore_task_cb, <void *>self))
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def __str__(self):
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return "%s Poller(func=%s, args=%s, kargs=%s)" % (Eo.__str__(self),
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self.func, self.args, self.kargs)
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def __repr__(self):
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return "%s Poller(interval=%d, func=%s, args=%s, kargs=%s)" % (Eo.__repr__(self),
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self.interval if self.obj else -1,
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self.func, self.args, self.kargs)
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cpdef bint _task_exec(self) except *:
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return self.func(*self.args, **self.kargs)
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def delete(self):
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""" Stop callback emission and free internal resources. """
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ecore_poller_del(self.obj)
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property interval:
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""" The interval (in ticks) between each call of the poller
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:type: int
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"""
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def __get__(self):
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return ecore_poller_poller_interval_get(self.obj)
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def __set__(self, int t):
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ecore_poller_poller_interval_set(self.obj, t)
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def interval_set(self, int t):
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ecore_poller_poller_interval_set(self.obj, t)
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def interval_get(self):
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return ecore_poller_poller_interval_get(self.obj)
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def poller_add(int t, func, *args, **kargs):
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return Poller(t, func, *args, **kargs)
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