1 files changed, 34 insertions, 5 deletions
diff --git a/src/python/src/_framework/foundation/callable_util.py b/src/python/src/_framework/foundation/callable_util.py
index 1f7546cb76..32b0751a01 100644
--- a/src/python/src/_framework/foundation/callable_util.py
+++ b/src/python/src/_framework/foundation/callable_util.py
@@ -29,18 +29,47 @@
 
 """Utilities for working with callables."""
 
+import abc
+import collections
+import enum
 import functools
 import logging
 
-from _framework.foundation import future
+
+class Outcome(object):
+  """A sum type describing the outcome of some call.
+
+  Attributes:
+    kind: One of Kind.RETURNED or Kind.RAISED respectively indicating that the
+      call returned a value or raised an exception.
+    return_value: The value returned by the call. Must be present if kind is
+      Kind.RETURNED.
+    exception: The exception raised by the call. Must be present if kind is
+      Kind.RAISED.
+  """
+  __metaclass__ = abc.ABCMeta
+
+  @enum.unique
+  class Kind(enum.Enum):
+    """Identifies the general kind of the outcome of some call."""
+
+    RETURNED = object()
+    RAISED = object()
+
+
+class _EasyOutcome(
+    collections.namedtuple(
+        '_EasyOutcome', ['kind', 'return_value', 'exception']),
+    Outcome):
+  """A trivial implementation of Outcome."""
 
 
 def _call_logging_exceptions(behavior, message, *args, **kwargs):
   try:
-    return future.returned(behavior(*args, **kwargs))
+    return _EasyOutcome(Outcome.Kind.RETURNED, behavior(*args, **kwargs), None)
   except Exception as e:  # pylint: disable=broad-except
     logging.exception(message)
-    return future.raised(e)
+    return _EasyOutcome(Outcome.Kind.RAISED, None, e)
 
 
 def with_exceptions_logged(behavior, message):
@@ -72,7 +101,7 @@ def call_logging_exceptions(behavior, message, *args, **kwargs):
     **kwargs: Keyword arguments to pass to the given behavior.
 
   Returns:
-    A future.Outcome describing whether the given behavior returned a value or
-      raised an exception.
+    An Outcome describing whether the given behavior returned a value or raised
+      an exception.
   """
   return _call_logging_exceptions(behavior, message, *args, **kwargs)