Update

subprojects/gst-devtools/debug-viewer/GstDebugViewer/Common/Data.py

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+# -*- coding: utf-8; mode: python; -*-
+#
+#  GStreamer Development Utilities
+#
+#  Copyright (C) 2007 René Stadler <mail@renestadler.de>
+#
+#  This program 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 3 of the License, or (at your option)
+#  any later version.
+#
+#  This program 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
+#  this program.  If not, see <http://www.gnu.org/licenses/>.
+
+"""GStreamer Development Utilities Common Data module."""
+
+import gi
+
+from gi.repository import GObject
+
+
+class Dispatcher (object):
+
+    def __call__(self, iterator):
+
+        raise NotImplementedError("derived classes must override this method")
+
+    def cancel(self):
+
+        pass
+
+
+class DefaultDispatcher (Dispatcher):
+
+    def __call__(self, iterator):
+
+        for x in iterator:
+            pass
+
+
+class GSourceDispatcher (Dispatcher):
+
+    def __init__(self):
+
+        Dispatcher.__init__(self)
+
+        self.source_id = None
+
+    def __call__(self, iterator):
+
+        if self.source_id is not None:
+            GObject.source_remove(self.source_id)
+
+        def iteration():
+            r = iterator.__next__()
+            if not r:
+                self.source_id = None
+            return r
+
+        self.source_id = GObject.idle_add(
+            iteration, priority=GObject.PRIORITY_LOW)
+
+    def cancel(self):
+
+        if self.source_id is None:
+            return
+
+        GObject.source_remove(self.source_id)
+        self.source_id = None