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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright (c) 2017 Cisco and/or its affiliates.
+#
+# 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.
+#
+
+from abc import ABC
+from enum import Enum
+
+from netmodel.model.type import Integer, String
+from vicn.core.attribute import Attribute, Multiplicity
+from vicn.core.resource import FactoryResource
+from vicn.resource.icn.icn_application import ICNApplication
+from vicn.resource.icn.face import Face
+from vicn.resource.icn.route import Route
+
+DEFAULT_CACHE_SIZE = 1000 # pk
+DEFAULT_CACHE_POLICY = 'LRU'
+DEFAULT_STRATEGY = 'best-route'
+
+class Forwarder(ICNApplication, ABC):
+ """
+ Resource: Forwarder
+ """
+
+ __type__ = FactoryResource
+
+ faces = Attribute(Face, description = 'ICN ffaces of the forwarder',
+ multiplicity = Multiplicity.OneToMany,
+ reverse_name = 'forwarder')
+ routes = Attribute(Route, description = 'Routes in the ICN FIB',
+ multiplicity = Multiplicity.OneToMany,
+ reverse_name = 'forwarder')
+ cache_size = Attribute(Integer,
+ description = 'Size of the cache (in chunks)',
+ default = DEFAULT_CACHE_SIZE)
+ cache_policy = Attribute(String, description = 'Cache policy',
+ default = DEFAULT_CACHE_POLICY)
+ strategy = Attribute(String, description = 'Forwarding Strategy',
+ default = DEFAULT_STRATEGY)
+ config_file = Attribute(String, description = 'Configuration file')
+ port = Attribute(Integer, description = 'Default listening port',
+ default = lambda self: self._get_default_port())
+ log_file = Attribute(String, description = 'Log file')
+
+ # Overloaded attributes
+
+ node = Attribute(
+ reverse_name = 'forwarder',
+ reverse_description = 'ICN forwarder attached to the node',
+ reverse_auto = True,
+ multiplicity = Multiplicity.OneToOne)