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+/*
+ * Copyright (c) 2017-2019 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.
+ */
+
+/**
+ * @file strategyImpl.h
+ * @brief Defines the function structure for a Strategy implementation
+ *
+ * <#Detailed Description#>
+ *
+ */
+
+/**
+ * A dispatch structure for a concrete implementation of a forwarding strategy.
+ */
+
+#ifndef strategyImpl_h
+#define strategyImpl_h
+
+#include <src/core/message.h>
+#include <src/core/numberSet.h>
+
+struct strategy_impl;
+typedef struct strategy_impl StrategyImpl;
+
+/**
+ * @typedef StrategyImpl
+ * @abstract Forwarding strategy implementation
+ * @constant receiveObject is called when we receive an object and have a
+ * measured round trip time.  This allows a strategy to update its performance
+ * data.
+ * @constant lookupNexthop Find the set of nexthops to use for the Interest.
+ *           May be empty, should not be NULL.  Must be destroyed.
+ * @constant addNexthop Add a nexthop to the list of available nexthops with a
+ * routing protocol-specific cost.
+ * @constant destroy cleans up the strategy, freeing all memory and state.  A
+ * strategy is reference counted, so the final destruction only happens after
+ * the last reference is released.
+ * @discussion <#Discussion#>
+ */
+struct strategy_impl {
+  void *context;
+  void (*receiveObject)(StrategyImpl *strategy, const NumberSet *egressId,
+                        const Message *objectMessage, Ticks rtt);
+  void (*onTimeout)(StrategyImpl *strategy, const NumberSet *egressId);
+  NumberSet *(*lookupNexthop)(StrategyImpl *strategy,
+                              const Message *interestMessage);
+  NumberSet *(*returnNexthops)(StrategyImpl *strategy);
+  unsigned (*countNexthops)(StrategyImpl *strategy);
+  void (*addNexthop)(StrategyImpl *strategy, unsigned connectionId);
+  void (*removeNexthop)(StrategyImpl *strategy, unsigned connectionId);
+  void (*destroy)(StrategyImpl **strategyPtr);
+  strategy_type (*getStrategy)(StrategyImpl *strategy);
+};
+#endif  // strategyImpl_h