1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef NET_SPDY_SPDY_BUFFER_QUEUE_H_
6#define NET_SPDY_SPDY_BUFFER_QUEUE_H_
7
8#include <cstddef>
9#include <deque>
10
11#include "base/basictypes.h"
12#include "base/memory/scoped_ptr.h"
13#include "net/base/net_export.h"
14
15namespace net {
16
17class SpdyBuffer;
18
19// A FIFO queue of incoming data from a SPDY connection. Useful for
20// SpdyStream delegates.
21class NET_EXPORT_PRIVATE SpdyReadQueue {
22 public:
23  SpdyReadQueue();
24  ~SpdyReadQueue();
25
26  // Returns whether there's anything in the queue.
27  bool IsEmpty() const;
28
29  // Returns the total number of bytes in the queue.
30  size_t GetTotalSize() const;
31
32  // Enqueues the bytes in |buffer|.
33  void Enqueue(scoped_ptr<SpdyBuffer> buffer);
34
35  // Dequeues up to |len| (which must be positive) bytes into
36  // |out|. Returns the number of bytes dequeued.
37  size_t Dequeue(char* out, size_t len);
38
39  // Removes all bytes from the queue.
40  void Clear();
41
42 private:
43  std::deque<SpdyBuffer*> queue_;
44  size_t total_size_;
45
46  DISALLOW_COPY_AND_ASSIGN(SpdyReadQueue);
47};
48
49}  // namespace net
50
51#endif  // NET_SPDY_SPDY_BUFFER_QUEUE_H_
52