1 // Copyright 2014 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.
5 #ifndef NET_QUIC_QUIC_WRITE_BLOCKED_LIST_H_
6 #define NET_QUIC_QUIC_WRITE_BLOCKED_LIST_H_
8 #include "net/base/net_export.h"
9 #include "net/quic/quic_protocol.h"
10 #include "net/spdy/write_blocked_list.h"
14 // Keeps tracks of the QUIC streams that have data to write, sorted by
15 // priority. QUIC stream priority order is:
16 // Crypto stream > Headers stream > Data streams by requested priority.
17 class NET_EXPORT_PRIVATE QuicWriteBlockedList {
19 typedef WriteBlockedList<QuicStreamId> QuicWriteBlockedListBase;
22 static const QuicPriority kHighestPriority;
23 static const QuicPriority kLowestPriority;
25 QuicWriteBlockedList();
26 ~QuicWriteBlockedList();
28 bool HasWriteBlockedStreams() const {
29 return crypto_stream_blocked_ ||
30 headers_stream_blocked_ ||
31 base_write_blocked_list_.HasWriteBlockedStreams();
34 size_t NumBlockedStreams() const {
35 size_t num_blocked = base_write_blocked_list_.NumBlockedStreams();
36 if (crypto_stream_blocked_) {
39 if (headers_stream_blocked_) {
46 QuicStreamId PopFront() {
47 if (crypto_stream_blocked_) {
48 crypto_stream_blocked_ = false;
49 return kCryptoStreamId;
50 } else if (headers_stream_blocked_) {
51 headers_stream_blocked_ = false;
52 return kHeadersStreamId;
54 SpdyPriority priority =
55 base_write_blocked_list_.GetHighestPriorityWriteBlockedList();
56 return base_write_blocked_list_.PopFront(priority);
60 // TODO(avd) Remove version argument when QUIC_VERSION_12 is deprecated.
61 void PushBack(QuicStreamId stream_id,
62 QuicPriority priority,
63 QuicVersion version) {
64 if (stream_id == kCryptoStreamId) {
65 DCHECK_EQ(kHighestPriority, priority);
66 // TODO(avd) Add DCHECK(!crypto_stream_blocked_)
67 crypto_stream_blocked_ = true;
68 } else if (version > QUIC_VERSION_12 &&
69 stream_id == kHeadersStreamId) {
70 DCHECK_EQ(kHighestPriority, priority);
71 // TODO(avd) Add DCHECK(!headers_stream_blocked_);
72 headers_stream_blocked_ = true;
74 base_write_blocked_list_.PushBack(
75 stream_id, static_cast<SpdyPriority>(priority));
80 QuicWriteBlockedListBase base_write_blocked_list_;
81 bool crypto_stream_blocked_;
82 bool headers_stream_blocked_;
84 DISALLOW_COPY_AND_ASSIGN(QuicWriteBlockedList);
90 #endif // NET_QUIC_QUIC_WRITE_BLOCKED_LIST_H_