Move shared files in net/quic/ into net/quic/core/

net/quic/quic_flow_controller.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.
-
-#ifndef NET_QUIC_QUIC_FLOW_CONTROLLER_H_
-#define NET_QUIC_QUIC_FLOW_CONTROLLER_H_
-
-#include "base/macros.h"
-#include "net/base/net_export.h"
-#include "net/quic/quic_protocol.h"
-
-namespace net {
-
-namespace test {
-class QuicFlowControllerPeer;
-}  // namespace test
-
-class QuicConnection;
-
-const QuicStreamId kConnectionLevelId = 0;
-
-// QuicFlowController allows a QUIC stream or connection to perform flow
-// control. The stream/connection owns a QuicFlowController which keeps track of
-// bytes sent/received, can tell the owner if it is flow control blocked, and
-// can send WINDOW_UPDATE or BLOCKED frames when needed.
-class NET_EXPORT_PRIVATE QuicFlowController {
- public:
-  QuicFlowController(QuicConnection* connection,
-                     QuicStreamId id,
-                     Perspective perspective,
-                     QuicStreamOffset send_window_offset,
-                     QuicStreamOffset receive_window_offset,
-                     bool should_auto_tune_receive_window);
-
-  ~QuicFlowController() {}
-
-  // Called when we see a new highest received byte offset from the peer, either
-  // via a data frame or a RST.
-  // Returns true if this call changes highest_received_byte_offset_, and false
-  // in the case where |new_offset| is <= highest_received_byte_offset_.
-  bool UpdateHighestReceivedOffset(QuicStreamOffset new_offset);
-
-  // Called when bytes received from the peer are consumed locally. This may
-  // trigger the sending of a WINDOW_UPDATE frame using |connection|.
-  void AddBytesConsumed(QuicByteCount bytes_consumed);
-
-  // Called when bytes are sent to the peer.
-  void AddBytesSent(QuicByteCount bytes_sent);
-
-  // Set a new send window offset.
-  // Returns true if this increases send_window_offset_ and is now blocked.
-  bool UpdateSendWindowOffset(QuicStreamOffset new_send_window_offset);
-
-  // Returns the current available send window.
-  QuicByteCount SendWindowSize() const;
-
-  // Send a BLOCKED frame if appropriate.
-  void MaybeSendBlocked();
-
-  // Returns true if flow control send limits have been reached.
-  bool IsBlocked() const;
-
-  // Returns true if flow control receive limits have been violated by the peer.
-  bool FlowControlViolation();
-
-  QuicByteCount bytes_consumed() const { return bytes_consumed_; }
-
-  QuicStreamOffset highest_received_byte_offset() const {
-    return highest_received_byte_offset_;
-  }
-
-  void set_receive_window_size_limit(QuicByteCount receive_window_size_limit) {
-    DCHECK_GE(receive_window_size_limit, receive_window_size_limit_);
-    receive_window_size_limit_ = receive_window_size_limit;
-  }
-
-  void set_auto_tune_receive_window(bool enable) {
-    auto_tune_receive_window_ = enable;
-  }
-
-  // Should only be called before any data is received.
-  void UpdateReceiveWindowSize(QuicStreamOffset size);
-
-  bool auto_tune_receive_window() { return auto_tune_receive_window_; }
-
- private:
-  friend class test::QuicFlowControllerPeer;
-
-  // Send a WINDOW_UPDATE frame if appropriate.
-  void MaybeSendWindowUpdate();
-
-  // Auto-tune the max receive window size.
-  void MaybeIncreaseMaxWindowSize();
-
-  // The parent connection, used to send connection close on flow control
-  // violation, and WINDOW_UPDATE and BLOCKED frames when appropriate.
-  // Not owned.
-  QuicConnection* connection_;
-
-  // ID of stream this flow controller belongs to. This can be 0 if this is a
-  // connection level flow controller.
-  QuicStreamId id_;
-
-  // Tracks if this is owned by a server or a client.
-  Perspective perspective_;
-
-  // Tracks number of bytes sent to the peer.
-  QuicByteCount bytes_sent_;
-
-  // The absolute offset in the outgoing byte stream. If this offset is reached
-  // then we become flow control blocked until we receive a WINDOW_UPDATE.
-  QuicStreamOffset send_window_offset_;
-
-  // Overview of receive flow controller.
-  //
-  // 0=...===1=======2-------3 ...... FIN
-  //         |<--- <= 4  --->|
-  //
-
-  // 1) bytes_consumed_ - moves forward when data is read out of the
-  //    stream.
-  //
-  // 2) highest_received_byte_offset_ - moves when data is received
-  //    from the peer.
-  //
-  // 3) receive_window_offset_ - moves when WINDOW_UPDATE is sent.
-  //
-  // 4) receive_window_size_ - maximum allowed unread data (3 - 1).
-  //    This value may be increased by auto-tuning.
-  //
-  // 5) receive_window_size_limit_ - limit on receive_window_size_;
-  //    auto-tuning will not increase window size beyond this limit.
-
-  // Track number of bytes received from the peer, which have been consumed
-  // locally.
-  QuicByteCount bytes_consumed_;
-
-  // The highest byte offset we have seen from the peer. This could be the
-  // highest offset in a data frame, or a final value in a RST.
-  QuicStreamOffset highest_received_byte_offset_;
-
-  // The absolute offset in the incoming byte stream. The peer should never send
-  // us bytes which are beyond this offset.
-  QuicStreamOffset receive_window_offset_;
-
-  // Largest size the receive window can grow to.
-  QuicByteCount receive_window_size_;
-
-  // Upper limit on receive_window_size_;
-  QuicByteCount receive_window_size_limit_;
-
-  // Used to dynamically enable receive window auto-tuning.
-  bool auto_tune_receive_window_;
-
-  // Send window update when receive window size drops below this.
-  QuicByteCount WindowUpdateThreshold();
-
-  // Keep track of the last time we sent a BLOCKED frame. We should only send
-  // another when the number of bytes we have sent has changed.
-  QuicStreamOffset last_blocked_send_window_offset_;
-
-  // Keep time of the last time a window update was sent.  We use this
-  // as part of the receive window auto tuning.
-  QuicTime prev_window_update_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(QuicFlowController);
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_QUIC_FLOW_CONTROLLER_H_