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115 lines
3.5 KiB
Python
115 lines
3.5 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Picard, the next-generation MusicBrainz tagger
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# Copyright (C) 2006 Lukáš Lalinský
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program 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
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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import sys
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from picard.util.queue import Queue
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from PyQt4 import QtCore
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class ProxyToMainEvent(QtCore.QEvent):
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def __init__(self, func, args, kwargs):
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QtCore.QEvent.__init__(self, QtCore.QEvent.User)
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self.func = func
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self.args = args
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self.kwargs = kwargs
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def call(self):
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self.func(*self.args, **self.kwargs)
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class Thread(QtCore.QThread):
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def __init__(self, parent, queue):
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QtCore.QThread.__init__(self, parent)
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self.queue = queue
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self.stopping = False
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def stop(self):
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self.stopping = True
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self.queue.put(None)
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def run(self):
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while not self.stopping:
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item = self.queue.get()
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if item is None:
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continue
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func, next, priority = item
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try:
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result = func()
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except:
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import traceback
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self.log.error(traceback.format_exc())
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self.to_main(next, priority, error=sys.exc_info()[1])
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else:
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self.to_main(next, priority, result=result)
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self.usleep(100)
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def to_main(self, func, priority, *args, **kwargs):
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event = ProxyToMainEvent(func, args, kwargs)
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QtCore.QCoreApplication.postEvent(self.parent(), event, priority)
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class ThreadPool(QtCore.QObject):
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instance = None
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def __init__(self, parent=None):
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QtCore.QObject.__init__(self, parent)
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self.queue = Queue()
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self.threads = [Thread(self, self.queue) for i in xrange(3)]
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self.ofa_queue = Queue()
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self.threads.append(Thread(self, self.ofa_queue))
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ThreadPool.instance = self
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def start(self):
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for thread in self.threads:
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thread.start(QtCore.QThread.LowPriority)
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def stop(self):
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for thread in self.threads:
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thread.stop()
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for thread in self.threads:
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thread.wait()
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def call(self, func, next, priority=QtCore.Qt.LowEventPriority):
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self.queue.put((func, next, priority))
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def ofa_call(self, func, next, priority=QtCore.Qt.LowEventPriority):
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self.ofa_queue.put((func, next, priority))
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def event(self, event):
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if isinstance(event, ProxyToMainEvent):
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try: event.call()
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except:
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import traceback
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self.log.error(traceback.format_exc())
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return True
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return False
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def call_from_thread(self, handler, *args, **kwargs):
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priority = kwargs.pop('priority', QtCore.Qt.LowEventPriority)
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event = ProxyToMainEvent(handler, args, kwargs)
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QtCore.QCoreApplication.postEvent(self, event, priority)
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# REMOVEME
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def proxy_to_main(handler, *args, **kwargs):
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ThreadPool.instance.call_from_thread(handler, *args, **kwargs)
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