1 files changed, 53 insertions, 0 deletions
diff --git a/tools/pkt_fwd/pkt_fwd.py b/tools/pkt_fwd/pkt_fwd.py
new file mode 100644
index 00000000..2580ee1f
--- /dev/null
+++ b/tools/pkt_fwd/pkt_fwd.py
@@ -0,0 +1,53 @@
+# Copyright 2016 Intel Corporation.
+#
+# 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 "packet forwarding" model.
+
+This is an abstract class for packet forwarders.
+"""
+
+class IPktFwd(object):
+    """Interface class that is implemented by specific classes
+    of packet forwarders
+    """
+
+    def __enter__(self):
+        """Start the packet forwarder.
+
+        Provide a context manager interface to the packet forwarders.
+        This simply calls the :func:`start` function.
+        """
+        return self.start()
+
+    def __exit__(self, type_, value, traceback):
+        """Stop the packet forwarder.
+
+        Provide a context manager interface to the packet forwarders.
+        This simply calls the :func:`stop` function.
+        """
+        self.stop()
+
+    def start(self):
+        """Start the packet forwarder.
+
+        :returns: None
+        """
+        raise NotImplementedError('Please call an implementation.')
+
+    def stop(self):
+        """Stop the packet forwarder.
+
+        :returns: None
+        """
+        raise NotImplementedError('Please call an implementation.')
+