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+# Copyright (c) 2020 Frank Harrison <frank@doublethefish.com>
+# Copyright (c) 2021 Pierre Sassoulas <pierre.sassoulas@gmail.com>
+# Copyright (c) 2021 Marc Mueller <30130371+cdce8p@users.noreply.github.com>
+
+# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
+import abc
+
+
+class MapReduceMixin(metaclass=abc.ABCMeta):
+ """A mixin design to allow multiprocess/threaded runs of a Checker"""
+
+ @abc.abstractmethod
+ def get_map_data(self):
+ """Returns mergable/reducible data that will be examined"""
+
+ @classmethod
+ @abc.abstractmethod
+ def reduce_map_data(cls, linter, data):
+ """For a given Checker, receives data for all mapped runs"""