Source code for PyMca5.PyMcaGui.pymca.QSource

#/*##########################################################################
# Copyright (C) 2004-2014 V.A. Sole, European Synchrotron Radiation Facility
#
# This file is part of the PyMca X-ray Fluorescence Toolkit developed at
# the ESRF by the Software group.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
#############################################################################*/
__author__ = "V.A. Sole - ESRF Data Analysis"
__contact__ = "sole@esrf.fr"
__license__ = "MIT"
__copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
import sys
from PyMca5.PyMcaGui import PyMcaQt as qt
QTVERSION = qt.qVersion()
DEBUG = 0
SOURCE_EVENT = qt.QEvent.User

[docs]class SourceEvent(qt.QEvent): def __init__(self, ddict=None): if ddict is None: ddict = {} self.dict = ddict qt.QEvent.__init__(self, SOURCE_EVENT)
import time try: import thread except ImportError: import _thread as thread import weakref
[docs]class QSource(qt.QObject): sigUpdated = qt.pyqtSignal(object) def __init__(self): qt.QObject.__init__(self, None) #no parent self.surveyDict = {} self.selections = {} self._pollTime = 0.7 #700 ms self.pollerThreadId = None
[docs] def setPollTime(self, pollTime): """Set polling time (in milliseconds)""" self._pollTime = max(pollTime * 0.001, 0.001) return self._pollTime * 1000
[docs] def getPollTime(self): return self._pollTime * 1000
[docs] def addToPoller(self, dataObject): """Set polling for data object""" sourceName = dataObject.info['SourceName'] if sourceName != self.sourceName: raise KeyError("Trying to survey key %s on wrong source %s" % (self.sourceName,dataObject.info['SourceName'])) #that is general to any source key = dataObject.info['Key'] reference = id(dataObject) def dataObjectDestroyed(ref, dataObjectKey=key, dataObjectRef=reference): if DEBUG: print('data object destroyed, key was %s' % dataObjectKey) print('data object destroyed, ref was 0x%x' % dataObjectRef) print("self.surveyDict[key] = ",self.surveyDict[key]) n = len(self.surveyDict[dataObjectKey]) if n > 0: n = range(n) n.reverse() for i in n: if not len(dir(self.surveyDict[dataObjectKey][i])): del self.surveyDict[dataObjectKey][i] if len(self.surveyDict[dataObjectKey]) == 0: del self.surveyDict[dataObjectKey] if DEBUG: print("SURVEY DICT AFTER DELETION = ", self.surveyDict) return # create a weak reference to the dataObject and we call it dataObjectRef dataObjectRef=weakref.proxy(dataObject, dataObjectDestroyed) try: if dataObjectRef not in self.surveyDict[key]: self.surveyDict[key].append(dataObjectRef) self.selections[key].append((id(dataObjectRef), dataObjectRef.info)) except KeyError: self.surveyDict[key] = [dataObjectRef] self.selections[key] = [(id(dataObjectRef), dataObjectRef.info)] except ReferenceError: if DEBUG: print("NOT ADDED TO THE POLL dataObject = ", dataObject) return if DEBUG: print("SURVEY DICT AFTER ADDITION = ", self.surveyDict) if self.pollerThreadId is None: # start a new polling thread #print "starting new thread" self.pollerThreadId = thread.start_new_thread(self.__run, ())
def __run(self): #print "RUN" while len(self.surveyDict) > 0: #for key in self.surveyDict is dangerous # runtime error: dictionnary changed during iteration # a mutex is needed if DEBUG: print("In loop") dummy = list(self.surveyDict.keys()) eventsToPost = {} #for key in self.surveyDict: for key in dummy: if key not in eventsToPost: eventsToPost[key] = [] if self.isUpdated(self.sourceName, key): if DEBUG: print(self.sourceName,key,"is updated") try: if len(self.surveyDict[key]): #there are still instances of dataObjects event = SourceEvent() event.dict['Key'] = key event.dict['event'] = 'updated' event.dict['id'] = self.surveyDict[key] scanselection = False if 'scanselection' in self.surveyDict[key][0].info: scanselection = \ self.surveyDict[key][0].info['scanselection'] if (key == 'SCAN_D') or scanselection: event.dict['scanselection'] = True else: event.dict['scanselection'] = False eventsToPost[key].append(event) else: del self.surveyDict[key] del self.selections[key] except KeyError: if DEBUG: print("key error in loop") pass for key in eventsToPost: for event in eventsToPost[key]: qt.QApplication.postEvent(self, event) qt.qApp.processEvents() time.sleep(self._pollTime) if DEBUG: print("woke up") self.pollerThreadId = None self.selections = {}