API changes to Write path Session on down for FEC protection.

net/quic/quic_packet_generator.h

 // Copyright (c) 2012 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.
 //
 // Responsible for generating packets on behalf of a QuicConnection.
 // Packets are serialized just-in-time.  Control frames are queued.
 // Ack and Feedback frames will be requested from the Connection
 // just-in-time.  When a packet needs to be sent, the Generator
 // will serialize a packet and pass it to QuicConnection::SendOrQueuePacket()
 //
@@ skipping 104 matching lines @@
   // packet creator to be serialized into packets. If not in batch
   // mode, these packets will also be sent during this call. Also
   // attaches a QuicAckNotifier to any created stream frames, which
   // will be called once the frame is ACKed by the peer. The
   // QuicAckNotifier is owned by the QuicConnection. |notifier| may
   // be NULL.
   QuicConsumedData ConsumeData(QuicStreamId id,
                                const IOVector& data,
                                QuicStreamOffset offset,
                                bool fin,
+                               FecProtection fec_protection,
                                QuicAckNotifier* notifier);
 
   // Indicates whether batch mode is currently enabled.
   bool InBatchMode();
   // Disables flushing.
   void StartBatchOperations();
   // Enables flushing and flushes queued data which can be sent.
   void FinishBatchOperations();
 
   // Flushes all queued frames, even frames which are not sendable.
   void FlushAllQueuedFrames();
 
   bool HasQueuedFrames() const;
 
   void set_debug_delegate(DebugDelegate* debug_delegate) {
     debug_delegate_ = debug_delegate;
   }
 
  private:
   friend class test::QuicPacketGeneratorPeer;
 
   // Turn on FEC protection for subsequent packets in the generator.
   // If no FEC group is currently open in the creator, this method flushes any
   // queued frames in the generator and in the creator, and it then turns FEC on
   // in the creator. This method may be called with an open FEC group in the
   // creator, in which case, only the generator's state is altered.
   void MaybeStartFecProtection();
 
-  // Turn off FEC protection for subsequent packets. If |force| is true,
-  // force-closes any open FEC group, sends out an FEC packet if one was under
-  // construction, and turns off protection in the generator and creator. If
-  // |force| is false, does the same as above if the creator is ready to send
-  // and FEC packet. Note that when |force| is false, the creator may still have
-  // an open FEC group after this method runs.
-  void MaybeStopFecProtection(bool force);
-
   // Serializes and calls the delegate on an FEC packet if one was under
   // construction in the creator. When |force| is false, it relies on the
   // creator being ready to send an FEC packet, otherwise FEC packet is sent
   // as long as one is under construction in the creator.  Also tries to turns
   // off FEC protection in the creator if it's off in the generator.
   void MaybeSendFecPacketAndCloseGroup(bool force);
 
   void SendQueuedFrames(bool flush);
 
   // Test to see if we have pending ack, feedback, or control frames.
@@ skipping 11 matching lines @@
 
   DelegateInterface* delegate_;
   DebugDelegate* debug_delegate_;
 
   QuicPacketCreator* packet_creator_;
   QuicFrames queued_control_frames_;
 
   // True if batch mode is currently enabled.
   bool batch_mode_;
 
-  // True if FEC protection is on.
+  // True if FEC protection is on. The creator may have an open FEC group even
+  // if this variable is false.
   bool should_fec_protect_;
 
   // Flags to indicate the need for just-in-time construction of a frame.
   bool should_send_ack_;
   bool should_send_feedback_;
   bool should_send_stop_waiting_;
   // If we put a non-retransmittable frame (namley ack or feedback frame) in
   // this packet, then we have to hold a reference to it until we flush (and
   // serialize it). Retransmittable frames are referenced elsewhere so that they
   // can later be (optionally) retransmitted.
   scoped_ptr<QuicAckFrame> pending_ack_frame_;
   scoped_ptr<QuicCongestionFeedbackFrame> pending_feedback_frame_;
   scoped_ptr<QuicStopWaitingFrame> pending_stop_waiting_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicPacketGenerator);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PACKET_GENERATOR_H_