net/spdy/spdy_write_queue.cc

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