/usr/lib/python2.7/dist-packages/PyMca/QSource.py is in pymca 4.7.4+dfsg-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 2004-2013 European Synchrotron Radiation Facility
#
# This file is part of the PyMca X-ray Fluorescence Toolkit developed at
# the ESRF by the Software group.
#
# This toolkit 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.
#
# PyMca 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
# PyMca; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# PyMca follows the dual licensing model of Riverbank's PyQt and cannot be
# used as a free plugin for a non-free program.
#
# Please contact the ESRF industrial unit (industry@esrf.fr) if this license
# is a problem for you.
#############################################################################*/
import sys
from PyMca import PyMcaQt as qt
QTVERSION = qt.qVersion()
DEBUG = 0
SOURCE_EVENT = qt.QEvent.User
if QTVERSION < '4.0.0':
class SourceEvent(qt.QCustomEvent):
def __init__(self, ddict=None):
if ddict is None:
ddict = {}
qt.QCustomEvent.__init__(self, SOURCE_EVENT)
self.dict = ddict
else:
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
class QSource(qt.QObject):
def __init__(self):
qt.QObject.__init__(self, None) #no parent
self.surveyDict = {}
self.selections = {}
self._pollTime = 0.7 #700 ms
self.pollerThreadId = None
def setPollTime(self, pollTime):
"""Set polling time (in milliseconds)"""
self._pollTime = max(pollTime * 0.001, 0.001)
return self._pollTime * 1000
def getPollTime(self):
return self._pollTime * 1000
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
try:
if QTVERSION < '4.0.0':
qt.qApp.processEvents()
qt.qApp.lock()
# Should one make a list of events to prevent
# posting the same event twice?
qt.QApplication.postEvent(self, event)
else:
eventsToPost[key].append(event)
finally:
if QTVERSION < '4.0.0':
qt.qApp.unlock()
else:
del self.surveyDict[key]
del self.selections[key]
except KeyError:
if DEBUG:
print("key error in loop")
pass
if QTVERSION > '4.0.0':
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 = {}
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