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registryconnecteddynamicserver.py
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registryconnecteddynamicserver.py
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#!/usr/bin/env python
#############################################################################
##
## Copyright (C) 2018 Riverbank Computing Limited
## Copyright (C) 2017 Ford Motor Company
##
## This file is part of the PyQt examples.
##
## $QT_BEGIN_LICENSE:BSD$
## Commercial License Usage
## Licensees holding valid commercial Qt licenses may use this file in
## accordance with the commercial license agreement provided with the
## Software or, alternatively, in accordance with the terms contained in
## a written agreement between you and The Qt Company. For licensing terms
## and conditions see https://www.qt.io/terms-conditions. For further
## information use the contact form at https://www.qt.io/contact-us.
##
## BSD License Usage
## Alternatively, you may use this file under the terms of the BSD license
## as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in
## the documentation and/or other materials provided with the
## distribution.
## * Neither the name of The Qt Company Ltd nor the names of its
## contributors may be used to endorse or promote products derived
## from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
## $QT_END_LICENSE$
##
#############################################################################
import sys
from PyQt5.QtCore import (pyqtProperty, pyqtSignal, pyqtSlot, QCoreApplication,
QObject, QTimer, QUrl)
from PyQt5.QtRemoteObjects import QRemoteObjectHost, QRemoteObjectRegistryHost
class SimpleSwitch(QObject):
def __init__(self, parent=None):
super().__init__(parent)
self._currState = False
self._stateChangeTimer = QTimer(self)
self._stateChangeTimer.timeout.connect(self._timeout)
self._stateChangeTimer.start(2000)
print("Source node started")
# PyQt does not support the use of static source types defined in .rep
# files. However we can manually specify a dynamic type that matches a
# .rep defined type by defining properties, signals and slots in the same
# order. We also have to account for any internals also generated by the
# .rep generator. At the moment this only includes an extra 'push' slot
# for each property (that never seems to get called). This allows this
# example to act as a server for Qt's C++ 'directconnectclient' example.
# It is not necessary when using with clients that use dynamic source types
# (written using either C++ or Python).
@pyqtSlot()
def pushCurrState(self, currState):
pass
def _get_currState(self):
return self._currState
def _set_currState(self, value):
# If the value has changed then update it and emit the notify signal.
if self._currState != value:
self._currState = value
self.currStateChanged.emit(value)
# The property's notify signal.
currStateChanged = pyqtSignal(bool)
# The property exposed to a remote client.
currState = pyqtProperty(bool, fget=_get_currState, fset=_set_currState,
notify=currStateChanged)
# The slot exposed to a remote client.
@pyqtSlot(bool)
def server_slot(self, clientState):
# The switch state echoed back by the client.
print("Replica state is", clientState)
def _timeout(self):
# Note that we don't decorate this callable so that it doesn't get
# exposed in a replica.
self.currState = not self.currState
print("Source state is", self.currState)
if __name__ == '__main__':
app = QCoreApplication(sys.argv)
# Create the simple switch.
srcSwitch = SimpleSwitch()
# Create the node that hosts the registry. This could be in a separate
# process.
regNode = QRemoteObjectRegistryHost(QUrl('local:registry'))
# Create the host object node. This will connect to the registry node
# rather than to a client.
srcNode = QRemoteObjectHost(QUrl('local:replica'), QUrl('local:registry'))
# Enable remoting.
srcNode.enableRemoting(srcSwitch, 'SimpleSwitch')
sys.exit(app.exec_())