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// 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 "base/logging.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() {}
SpdyWriteQueue::SpdyWriteQueue() {}
SpdyWriteQueue::~SpdyWriteQueue() {
Clear();
}
bool SpdyWriteQueue::IsEmpty() const {
for (int i = 0; i < NUM_PRIORITIES; i++) {
if (!queue_[i].empty())
return false;
}
return true;
}
void SpdyWriteQueue::Enqueue(RequestPriority priority,
SpdyFrameType frame_type,
scoped_ptr<SpdyBufferProducer> frame_producer,
const base::WeakPtr<SpdyStream>& stream) {
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,
scoped_ptr<SpdyBufferProducer>* frame_producer,
base::WeakPtr<SpdyStream>* stream) {
for (int i = NUM_PRIORITIES - 1; i >= 0; --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) {
DCHECK(stream.get());
if (DCHECK_IS_ON()) {
// |stream| should not have pending writes in a queue not matching
// its priority.
for (int i = 0; i < NUM_PRIORITIES; ++i) {
if (stream->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());
}
}
}
// Do the actual deletion and removal, preserving FIFO-ness.
std::deque<PendingWrite>* queue = &queue_[stream->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()) {
delete it->frame_producer;
} else {
*out_it = *it;
++out_it;
}
}
queue->erase(out_it, queue->end());
}
void SpdyWriteQueue::RemovePendingWritesForStreamsAfter(
SpdyStreamId last_good_stream_id) {
for (int i = 0; i < NUM_PRIORITIES; ++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)) {
delete it->frame_producer;
} else {
*out_it = *it;
++out_it;
}
}
queue->erase(out_it, queue->end());
}
}
void SpdyWriteQueue::Clear() {
for (int i = 0; i < NUM_PRIORITIES; ++i) {
for (std::deque<PendingWrite>::iterator it = queue_[i].begin();
it != queue_[i].end(); ++it) {
delete it->frame_producer;
}
queue_[i].clear();
}
}
} // namespace net
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