1 files changed, 121 insertions, 0 deletions
diff --git a/libtransport/includes/hicn/transport/interfaces/statistics.h b/libtransport/includes/hicn/transport/interfaces/statistics.h
new file mode 100644
index 000000000..26831fbf1
--- /dev/null
+++ b/libtransport/includes/hicn/transport/interfaces/statistics.h
@@ -0,0 +1,121 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <hicn/transport/portability/c_portability.h>
+
+#include <cstdint>
+
+namespace transport {
+
+namespace interface {
+
+class IcnObserver {
+ public:
+  virtual ~IcnObserver(){};
+
+  virtual void notifyStats(double throughput) = 0;
+  virtual void notifyDownloadTime(double downloadTime) = 0;
+};
+
+class TransportStatistics {
+  static constexpr double default_alpha = 0.7;
+
+ public:
+  TransportStatistics(double alpha = default_alpha)
+      : retx_count_(0),
+        bytes_received_(0),
+        average_rtt_(0),
+        avg_window_size_(0),
+        interest_tx_(0),
+        alpha_(alpha),
+        loss_ratio_(0.0),
+        queuing_delay_(0.0) {}
+
+  TRANSPORT_ALWAYS_INLINE void updateRetxCount(uint64_t retx) {
+    retx_count_ += retx;
+  }
+
+  TRANSPORT_ALWAYS_INLINE void updateBytesRecv(uint64_t bytes) {
+    bytes_received_ += bytes;
+  }
+
+  TRANSPORT_ALWAYS_INLINE void updateAverageRtt(uint64_t rtt) {
+    average_rtt_ = (alpha_ * average_rtt_) + ((1. - alpha_) * double(rtt));
+  }
+
+  TRANSPORT_ALWAYS_INLINE void updateAverageWindowSize(double current_window) {
+    avg_window_size_ =
+        (alpha_ * avg_window_size_) + ((1. - alpha_) * current_window);
+  }
+
+  TRANSPORT_ALWAYS_INLINE void updateInterestTx(uint64_t int_tx) {
+    interest_tx_ += int_tx;
+  }
+
+  TRANSPORT_ALWAYS_INLINE void updateLossRatio(double loss_ratio) {
+    loss_ratio_ = loss_ratio;
+  }
+
+  TRANSPORT_ALWAYS_INLINE void updateQueuingDelay(double queuing_delay) {
+    queuing_delay_ = queuing_delay;
+  }
+
+  TRANSPORT_ALWAYS_INLINE uint64_t getRetxCount() const { return retx_count_; }
+
+  TRANSPORT_ALWAYS_INLINE uint64_t getBytesRecv() const {
+    return bytes_received_;
+  }
+
+  TRANSPORT_ALWAYS_INLINE double getAverageRtt() const { return average_rtt_; }
+
+  TRANSPORT_ALWAYS_INLINE double getAverageWindowSize() const {
+    return avg_window_size_;
+  }
+
+  TRANSPORT_ALWAYS_INLINE uint64_t getInterestTx() const {
+    return interest_tx_;
+  }
+
+  TRANSPORT_ALWAYS_INLINE double getLossRatio() const { return loss_ratio_; }
+
+  TRANSPORT_ALWAYS_INLINE double getQueuingDelay() const {
+    return queuing_delay_;
+  }
+
+  TRANSPORT_ALWAYS_INLINE void reset() {
+    retx_count_ = 0;
+    bytes_received_ = 0;
+    average_rtt_ = 0;
+    avg_window_size_ = 0;
+    interest_tx_ = 0;
+    loss_ratio_ = 0;
+  }
+
+ private:
+  uint64_t retx_count_;
+  uint64_t bytes_received_;
+  double average_rtt_;
+  double avg_window_size_;
+  uint64_t interest_tx_;
+  double alpha_;
+  double loss_ratio_;
+  double queuing_delay_;
+};
+
+}  // namespace interface
+
+}  // end namespace transport