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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_SPDY_SPDY_WRITE_QUEUE_H_
#define NET_SPDY_SPDY_WRITE_QUEUE_H_
#include <array>
#include <memory>
#include "base/containers/circular_deque.h"
#include "base/memory/weak_ptr.h"
#include "net/base/net_export.h"
#include "net/base/request_priority.h"
#include "net/third_party/quiche/src/quiche/http2/core/spdy_protocol.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
namespace net {
// Returns whether this frame type is subject to caps on how many
// frames can be queued at any given time.
NET_EXPORT_PRIVATE bool IsSpdyFrameTypeWriteCapped(
spdy::SpdyFrameType frame_type);
class SpdyBufferProducer;
class SpdyStream;
// A queue of SpdyBufferProducers to produce frames to write. Ordered
// by priority, and then FIFO.
class NET_EXPORT_PRIVATE SpdyWriteQueue {
public:
SpdyWriteQueue();
SpdyWriteQueue(const SpdyWriteQueue&) = delete;
SpdyWriteQueue& operator=(const SpdyWriteQueue&) = delete;
~SpdyWriteQueue();
// Returns whether there is anything in the write queue,
// i.e. whether the next call to Dequeue will return true.
bool IsEmpty() const;
// Enqueues the given frame producer of the given type at the given
// priority associated with the given stream, which may be NULL if
// the frame producer is not associated with a stream. If |stream|
// is non-NULL, its priority must be equal to |priority|, and it
// must remain non-NULL until the write is dequeued or removed.
void Enqueue(RequestPriority priority,
spdy::SpdyFrameType frame_type,
std::unique_ptr<SpdyBufferProducer> frame_producer,
const base::WeakPtr<SpdyStream>& stream,
const NetworkTrafficAnnotationTag& traffic_annotation);
// Dequeues the frame producer with the highest priority that was
// enqueued the earliest and its associated stream. Returns true and
// fills in |frame_type|, |frame_producer|, and |stream| if
// successful -- otherwise, just returns false.
bool Dequeue(spdy::SpdyFrameType* frame_type,
std::unique_ptr<SpdyBufferProducer>* frame_producer,
base::WeakPtr<SpdyStream>* stream,
MutableNetworkTrafficAnnotationTag* traffic_annotation);
// Removes all pending writes for the given stream, which must be
// non-NULL.
void RemovePendingWritesForStream(SpdyStream* stream);
// Removes all pending writes for streams after |last_good_stream_id|
// and streams with no stream id.
void RemovePendingWritesForStreamsAfter(
spdy::SpdyStreamId last_good_stream_id);
// Change priority of all pending writes for the given stream. Frames will be
// queued after other writes with |new_priority|.
void ChangePriorityOfWritesForStream(SpdyStream* stream,
RequestPriority old_priority,
RequestPriority new_priority);
// Removes all pending writes.
void Clear();
// Returns the number of currently queued capped frames including all
// priorities.
int num_queued_capped_frames() const { return num_queued_capped_frames_; }
private:
// A struct holding a frame producer and its associated stream.
struct PendingWrite {
spdy::SpdyFrameType frame_type;
std::unique_ptr<SpdyBufferProducer> frame_producer;
base::WeakPtr<SpdyStream> stream;
MutableNetworkTrafficAnnotationTag traffic_annotation;
// Whether |stream| was non-NULL when enqueued.
bool has_stream;
PendingWrite();
PendingWrite(spdy::SpdyFrameType frame_type,
std::unique_ptr<SpdyBufferProducer> frame_producer,
const base::WeakPtr<SpdyStream>& stream,
const MutableNetworkTrafficAnnotationTag& traffic_annotation);
PendingWrite(const PendingWrite&) = delete;
PendingWrite& operator=(const PendingWrite&) = delete;
PendingWrite(PendingWrite&& other);
PendingWrite& operator=(PendingWrite&& other);
~PendingWrite();
};
bool removing_writes_ = false;
// Number of currently queued capped frames including all priorities.
int num_queued_capped_frames_ = 0;
// The actual write queue, binned by priority.
std::array<base::circular_deque<PendingWrite>, NUM_PRIORITIES> queue_;
};
} // namespace net
#endif // NET_SPDY_SPDY_WRITE_QUEUE_H_
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