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diff --git a/src/python/_framework/base/packets/_context.py b/src/python/_framework/base/packets/_context.py
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+++ b/src/python/_framework/base/packets/_context.py
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+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""State and behavior for operation context."""
+
+import time
+
+# _interfaces and packets are referenced from specification in this module.
+from _framework.base import interfaces as base_interfaces
+from _framework.base.packets import _interfaces  # pylint: disable=unused-import
+from _framework.base.packets import packets  # pylint: disable=unused-import
+
+
+class OperationContext(base_interfaces.OperationContext):
+  """An implementation of base_interfaces.OperationContext."""
+
+  def __init__(
+      self, lock, operation_id, local_failure, termination_manager,
+      transmission_manager):
+    """Constructor.
+
+    Args:
+      lock: The operation-wide lock.
+      operation_id: An object identifying the operation.
+      local_failure: Whichever one of packets.Kind.SERVICED_FAILURE or
+        packets.Kind.SERVICER_FAILURE describes local failure of customer code.
+      termination_manager: The _interfaces.TerminationManager for the operation.
+      transmission_manager: The _interfaces.TransmissionManager for the
+        operation.
+    """
+    self._lock = lock
+    self._local_failure = local_failure
+    self._termination_manager = termination_manager
+    self._transmission_manager = transmission_manager
+    self._ingestion_manager = None
+    self._expiration_manager = None
+
+    self.operation_id = operation_id
+
+  def set_ingestion_and_expiration_managers(
+      self, ingestion_manager, expiration_manager):
+    """Sets managers with which this OperationContext cooperates.
+
+    Args:
+      ingestion_manager: The _interfaces.IngestionManager for the operation.
+      expiration_manager: The _interfaces.ExpirationManager for the operation.
+    """
+    self._ingestion_manager = ingestion_manager
+    self._expiration_manager = expiration_manager
+
+  def is_active(self):
+    """See base_interfaces.OperationContext.is_active for specification."""
+    with self._lock:
+      return self._termination_manager.is_active()
+
+  def add_termination_callback(self, callback):
+    """See base_interfaces.OperationContext.add_termination_callback."""
+    with self._lock:
+      self._termination_manager.add_callback(callback)
+
+  def time_remaining(self):
+    """See interfaces.OperationContext.time_remaining for specification."""
+    with self._lock:
+      deadline = self._expiration_manager.deadline()
+    return max(0.0, deadline - time.time())
+
+  def fail(self, exception):
+    """See interfaces.OperationContext.fail for specification."""
+    with self._lock:
+      self._termination_manager.abort(self._local_failure)
+      self._transmission_manager.abort(self._local_failure)
+      self._ingestion_manager.abort()
+      self._expiration_manager.abort()