QUIC test only change to add a convenience operator for printing

net/quic/congestion_control/send_algorithm_simulator.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // A test only class to enable simulations of send algorithms.
 
 #ifndef NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_SIMULATOR_H_
 #define NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_SIMULATOR_H_
 
 #include <algorithm>
+#include <string>
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/format_macros.h"
+#include "base/strings/stringprintf.h"
 #include "net/quic/congestion_control/send_algorithm_interface.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_time.h"
 #include "net/quic/test_tools/mock_clock.h"
 #include "net/quic/test_tools/quic_test_utils.h"
 
+using base::StringPrintf;
+
 namespace net {
 
 class SendAlgorithmSimulator {
  public:
   struct Sender {
     Sender(SendAlgorithmInterface* send_algorithm,  RttStats* rtt_stats);
 
     void RecordStats() {
       QuicByteCount cwnd = send_algorithm->GetCongestionWindow();
       max_cwnd = std::max(max_cwnd, cwnd);
       min_cwnd = std::min(min_cwnd, cwnd);
       if (last_cwnd > cwnd) {
         max_cwnd_drop = std::max(max_cwnd_drop, last_cwnd - cwnd);
       }
       last_cwnd = cwnd;
     }
 
+    std::string DebugString() {
+      return StringPrintf("observed goodput(bytes/s):%" PRId64 " cwnd:%" PRIu64
+                          " max_cwnd:%" PRIu64 " min_cwnd:%" PRIu64
+                          " max_cwnd_drop:%" PRIu64,
+                          last_transfer_bandwidth.ToBytesPerSecond(),
+                          send_algorithm->GetCongestionWindow(),
+                          max_cwnd, min_cwnd, max_cwnd_drop);
+    }

[Ryan Hamilton, 2014/07/17 00:02:46]

I suspect you'll need to move this to the .cc file.

[ramant (doing other things), 2014/07/18 18:02:25]

I am surprised, not sure why compiler's didn't complain(I thought I may have to
move the code into .cc file too).

Left the code similar to the internal source tree.

+
     SendAlgorithmInterface* send_algorithm;
     RttStats* rtt_stats;
 
     // Last sequence number the sender sent.
     QuicPacketSequenceNumber last_sent;
     // Last packet sequence number acked.
     QuicPacketSequenceNumber last_acked;
     // Packet sequence number to ack up to.
     QuicPacketSequenceNumber next_acked;
 
@@ skipping 129 matching lines @@
   QuicBandwidth bandwidth_;
   QuicTime::Delta rtt_;
   size_t buffer_size_;       // In bytes.
 
   DISALLOW_COPY_AND_ASSIGN(SendAlgorithmSimulator);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CONGESTION_CONTROL_SEND_ALGORITHM_SIMULATOR_H_