1 files changed, 64 insertions, 0 deletions
diff --git a/google/api_core/future/base.py b/google/api_core/future/base.py
new file mode 100644
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+++ b/google/api_core/future/base.py
@@ -0,0 +1,64 @@
+# Copyright 2017, Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Abstract and helper bases for Future implementations."""
+
+import abc
+
+
+class Future(object, metaclass=abc.ABCMeta):
+    # pylint: disable=missing-docstring
+    # We inherit the interfaces here from concurrent.futures.
+
+    """Future interface.
+
+    This interface is based on :class:`concurrent.futures.Future`.
+    """
+
+    @abc.abstractmethod
+    def cancel(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def cancelled(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def running(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def done(self):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def result(self, timeout=None):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def exception(self, timeout=None):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def add_done_callback(self, fn):
+        # pylint: disable=invalid-name
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def set_result(self, result):
+        raise NotImplementedError()
+
+    @abc.abstractmethod
+    def set_exception(self, exception):
+        raise NotImplementedError()