1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
// Copyright (c) 2013 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.
#include "net/spdy/spdy_write_queue.h"
#include <cstddef>
#include <vector>
#include "base/logging.h"
#include "base/stl_util.h"
#include "net/spdy/spdy_buffer.h"
#include "net/spdy/spdy_buffer_producer.h"
#include "net/spdy/spdy_stream.h"
namespace net {
SpdyWriteQueue::PendingWrite::PendingWrite() : frame_producer(NULL) {}
SpdyWriteQueue::PendingWrite::PendingWrite(
SpdyFrameType frame_type,
SpdyBufferProducer* frame_producer,
const base::WeakPtr<SpdyStream>& stream)
: frame_type(frame_type),
frame_producer(frame_producer),
stream(stream),
has_stream(stream.get() != NULL) {}
SpdyWriteQueue::PendingWrite::PendingWrite(const PendingWrite& other) = default;
SpdyWriteQueue::PendingWrite::~PendingWrite() {}
SpdyWriteQueue::SpdyWriteQueue() : removing_writes_(false) {}
SpdyWriteQueue::~SpdyWriteQueue() {
Clear();
}
bool SpdyWriteQueue::IsEmpty() const {
for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; i++) {
if (!queue_[i].empty())
return false;
}
return true;
}
void SpdyWriteQueue::Enqueue(RequestPriority priority,
SpdyFrameType frame_type,
std::unique_ptr<SpdyBufferProducer> frame_producer,
const base::WeakPtr<SpdyStream>& stream) {
CHECK(!removing_writes_);
CHECK_GE(priority, MINIMUM_PRIORITY);
CHECK_LE(priority, MAXIMUM_PRIORITY);
if (stream.get())
DCHECK_EQ(stream->priority(), priority);
queue_[priority].push_back(
PendingWrite(frame_type, frame_producer.release(), stream));
}
bool SpdyWriteQueue::Dequeue(
SpdyFrameType* frame_type,
std::unique_ptr<SpdyBufferProducer>* frame_producer,
base::WeakPtr<SpdyStream>* stream) {
CHECK(!removing_writes_);
for (int i = MAXIMUM_PRIORITY; i >= MINIMUM_PRIORITY; --i) {
if (!queue_[i].empty()) {
PendingWrite pending_write = queue_[i].front();
queue_[i].pop_front();
*frame_type = pending_write.frame_type;
frame_producer->reset(pending_write.frame_producer);
*stream = pending_write.stream;
if (pending_write.has_stream)
DCHECK(stream->get());
return true;
}
}
return false;
}
void SpdyWriteQueue::RemovePendingWritesForStream(
const base::WeakPtr<SpdyStream>& stream) {
CHECK(!removing_writes_);
removing_writes_ = true;
RequestPriority priority = stream->priority();
CHECK_GE(priority, MINIMUM_PRIORITY);
CHECK_LE(priority, MAXIMUM_PRIORITY);
DCHECK(stream.get());
#if DCHECK_IS_ON()
// |stream| should not have pending writes in a queue not matching
// its priority.
for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
if (priority == i)
continue;
for (std::deque<PendingWrite>::const_iterator it = queue_[i].begin();
it != queue_[i].end(); ++it) {
DCHECK_NE(it->stream.get(), stream.get());
}
}
#endif
// Defer deletion until queue iteration is complete, as
// SpdyBuffer::~SpdyBuffer() can result in callbacks into SpdyWriteQueue.
std::vector<SpdyBufferProducer*> erased_buffer_producers;
// Do the actual deletion and removal, preserving FIFO-ness.
std::deque<PendingWrite>* queue = &queue_[priority];
std::deque<PendingWrite>::iterator out_it = queue->begin();
for (std::deque<PendingWrite>::const_iterator it = queue->begin();
it != queue->end(); ++it) {
if (it->stream.get() == stream.get()) {
erased_buffer_producers.push_back(it->frame_producer);
} else {
*out_it = *it;
++out_it;
}
}
queue->erase(out_it, queue->end());
removing_writes_ = false;
STLDeleteElements(&erased_buffer_producers); // Invokes callbacks.
}
void SpdyWriteQueue::RemovePendingWritesForStreamsAfter(
SpdyStreamId last_good_stream_id) {
CHECK(!removing_writes_);
removing_writes_ = true;
std::vector<SpdyBufferProducer*> erased_buffer_producers;
for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
// Do the actual deletion and removal, preserving FIFO-ness.
std::deque<PendingWrite>* queue = &queue_[i];
std::deque<PendingWrite>::iterator out_it = queue->begin();
for (std::deque<PendingWrite>::const_iterator it = queue->begin();
it != queue->end(); ++it) {
if (it->stream.get() && (it->stream->stream_id() > last_good_stream_id ||
it->stream->stream_id() == 0)) {
erased_buffer_producers.push_back(it->frame_producer);
} else {
*out_it = *it;
++out_it;
}
}
queue->erase(out_it, queue->end());
}
removing_writes_ = false;
STLDeleteElements(&erased_buffer_producers); // Invokes callbacks.
}
void SpdyWriteQueue::Clear() {
CHECK(!removing_writes_);
removing_writes_ = true;
std::vector<SpdyBufferProducer*> erased_buffer_producers;
for (int i = MINIMUM_PRIORITY; i <= MAXIMUM_PRIORITY; ++i) {
for (std::deque<PendingWrite>::iterator it = queue_[i].begin();
it != queue_[i].end(); ++it) {
erased_buffer_producers.push_back(it->frame_producer);
}
queue_[i].clear();
}
removing_writes_ = false;
STLDeleteElements(&erased_buffer_producers); // Invokes callbacks.
}
} // namespace net
|
