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// 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_WRITE_BLOCKED_LIST_H_
#define NET_QUIC_QUIC_WRITE_BLOCKED_LIST_H_
#include <set>
#include "net/base/net_export.h"
#include "net/quic/quic_protocol.h"
#include "net/spdy/write_blocked_list.h"
namespace net {
// Keeps tracks of the QUIC streams that have data to write, sorted by
// priority. QUIC stream priority order is:
// Crypto stream > Headers stream > Data streams by requested priority.
class NET_EXPORT_PRIVATE QuicWriteBlockedList {
private:
typedef WriteBlockedList<QuicStreamId> QuicWriteBlockedListBase;
public:
static const QuicPriority kHighestPriority;
static const QuicPriority kLowestPriority;
QuicWriteBlockedList();
~QuicWriteBlockedList();
bool HasWriteBlockedDataStreams() const {
return base_write_blocked_list_.HasWriteBlockedStreams();
}
bool HasWriteBlockedCryptoOrHeadersStream() const {
return crypto_stream_blocked_ || headers_stream_blocked_;
}
size_t NumBlockedStreams() const {
size_t num_blocked = base_write_blocked_list_.NumBlockedStreams();
if (crypto_stream_blocked_) {
++num_blocked;
}
if (headers_stream_blocked_) {
++num_blocked;
}
return num_blocked;
}
QuicStreamId PopFront() {
if (crypto_stream_blocked_) {
crypto_stream_blocked_ = false;
return kCryptoStreamId;
}
if (headers_stream_blocked_) {
headers_stream_blocked_ = false;
return kHeadersStreamId;
}
SpdyPriority priority =
base_write_blocked_list_.GetHighestPriorityWriteBlockedList();
QuicStreamId id = base_write_blocked_list_.PopFront(priority);
blocked_streams_.erase(id);
return id;
}
void PushBack(QuicStreamId stream_id, QuicPriority priority) {
if (stream_id == kCryptoStreamId) {
DCHECK_EQ(kHighestPriority, priority);
// TODO(avd) Add DCHECK(!crypto_stream_blocked_)
crypto_stream_blocked_ = true;
return;
}
if (stream_id == kHeadersStreamId) {
DCHECK_EQ(kHighestPriority, priority);
// TODO(avd) Add DCHECK(!headers_stream_blocked_);
headers_stream_blocked_ = true;
return;
}
if (blocked_streams_.find(stream_id) != blocked_streams_.end()) {
DVLOG(1) << "Stream " << stream_id << " already in write blocked list.";
return;
}
base_write_blocked_list_.PushBack(
stream_id, static_cast<SpdyPriority>(priority));
blocked_streams_.insert(stream_id);
return;
}
bool crypto_stream_blocked() const { return crypto_stream_blocked_; }
bool headers_stream_blocked() const { return headers_stream_blocked_; }
private:
QuicWriteBlockedListBase base_write_blocked_list_;
bool crypto_stream_blocked_;
bool headers_stream_blocked_;
// Keep track of write blocked streams in a set for faster membership checking
// than iterating over the base_write_blocked_list_. The contents of this set
// should mirror the contents of base_write_blocked_list_.
std::set<QuicStreamId> blocked_streams_;
DISALLOW_COPY_AND_ASSIGN(QuicWriteBlockedList);
};
} // namespace net
#endif // NET_QUIC_QUIC_WRITE_BLOCKED_LIST_H_
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