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      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 
      9 #include "base/logging.h"
     10 #include "net/spdy/spdy_buffer.h"
     11 #include "net/spdy/spdy_buffer_producer.h"
     12 #include "net/spdy/spdy_stream.h"
     13 
     14 namespace net {
     15 
     16 SpdyWriteQueue::PendingWrite::PendingWrite() : frame_producer(NULL) {}
     17 
     18 SpdyWriteQueue::PendingWrite::PendingWrite(
     19     SpdyFrameType frame_type,
     20     SpdyBufferProducer* frame_producer,
     21     const base::WeakPtr<SpdyStream>& stream)
     22     : frame_type(frame_type),
     23       frame_producer(frame_producer),
     24       stream(stream),
     25       has_stream(stream.get() != NULL) {}
     26 
     27 SpdyWriteQueue::PendingWrite::~PendingWrite() {}
     28 
     29 SpdyWriteQueue::SpdyWriteQueue() {}
     30 
     31 SpdyWriteQueue::~SpdyWriteQueue() {
     32   Clear();
     33 }
     34 
     35 bool SpdyWriteQueue::IsEmpty() const {
     36   for (int i = 0; i < NUM_PRIORITIES; i++) {
     37     if (!queue_[i].empty())
     38       return false;
     39   }
     40   return true;
     41 }
     42 
     43 void SpdyWriteQueue::Enqueue(RequestPriority priority,
     44                              SpdyFrameType frame_type,
     45                              scoped_ptr<SpdyBufferProducer> frame_producer,
     46                              const base::WeakPtr<SpdyStream>& stream) {
     47   if (stream.get())
     48     DCHECK_EQ(stream->priority(), priority);
     49   queue_[priority].push_back(
     50       PendingWrite(frame_type, frame_producer.release(), stream));
     51 }
     52 
     53 bool SpdyWriteQueue::Dequeue(SpdyFrameType* frame_type,
     54                              scoped_ptr<SpdyBufferProducer>* frame_producer,
     55                              base::WeakPtr<SpdyStream>* stream) {
     56   for (int i = NUM_PRIORITIES - 1; i >= 0; --i) {
     57     if (!queue_[i].empty()) {
     58       PendingWrite pending_write = queue_[i].front();
     59       queue_[i].pop_front();
     60       *frame_type = pending_write.frame_type;
     61       frame_producer->reset(pending_write.frame_producer);
     62       *stream = pending_write.stream;
     63       if (pending_write.has_stream)
     64         DCHECK(stream->get());
     65       return true;
     66     }
     67   }
     68   return false;
     69 }
     70 
     71 void SpdyWriteQueue::RemovePendingWritesForStream(
     72     const base::WeakPtr<SpdyStream>& stream) {
     73   DCHECK(stream.get());
     74   if (DCHECK_IS_ON()) {
     75     // |stream| should not have pending writes in a queue not matching
     76     // its priority.
     77     for (int i = 0; i < NUM_PRIORITIES; ++i) {
     78       if (stream->priority() == i)
     79         continue;
     80       for (std::deque<PendingWrite>::const_iterator it = queue_[i].begin();
     81            it != queue_[i].end(); ++it) {
     82         DCHECK_NE(it->stream.get(), stream.get());
     83       }
     84     }
     85   }
     86 
     87   // Do the actual deletion and removal, preserving FIFO-ness.
     88   std::deque<PendingWrite>* queue = &queue_[stream->priority()];
     89   std::deque<PendingWrite>::iterator out_it = queue->begin();
     90   for (std::deque<PendingWrite>::const_iterator it = queue->begin();
     91        it != queue->end(); ++it) {
     92     if (it->stream.get() == stream.get()) {
     93       delete it->frame_producer;
     94     } else {
     95       *out_it = *it;
     96       ++out_it;
     97     }
     98   }
     99   queue->erase(out_it, queue->end());
    100 }
    101 
    102 void SpdyWriteQueue::RemovePendingWritesForStreamsAfter(
    103     SpdyStreamId last_good_stream_id) {
    104   for (int i = 0; i < NUM_PRIORITIES; ++i) {
    105     // Do the actual deletion and removal, preserving FIFO-ness.
    106     std::deque<PendingWrite>* queue = &queue_[i];
    107     std::deque<PendingWrite>::iterator out_it = queue->begin();
    108     for (std::deque<PendingWrite>::const_iterator it = queue->begin();
    109          it != queue->end(); ++it) {
    110       if (it->stream.get() && (it->stream->stream_id() > last_good_stream_id ||
    111                                it->stream->stream_id() == 0)) {
    112         delete it->frame_producer;
    113       } else {
    114         *out_it = *it;
    115         ++out_it;
    116       }
    117     }
    118     queue->erase(out_it, queue->end());
    119   }
    120 }
    121 
    122 void SpdyWriteQueue::Clear() {
    123   for (int i = 0; i < NUM_PRIORITIES; ++i) {
    124     for (std::deque<PendingWrite>::iterator it = queue_[i].begin();
    125          it != queue_[i].end(); ++it) {
    126       delete it->frame_producer;
    127     }
    128     queue_[i].clear();
    129   }
    130 }
    131 
    132 }  // namespace net
    133