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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_READ_QUEUE_H_
#define NET_SPDY_SPDY_READ_QUEUE_H_
#include <cstddef>
#include <memory>
#include "base/containers/circular_deque.h"
#include "net/base/net_export.h"
namespace net {
class SpdyBuffer;
// A FIFO queue of incoming data from a SPDY connection. Useful for
// SpdyStream delegates.
class NET_EXPORT_PRIVATE SpdyReadQueue {
public:
SpdyReadQueue();
SpdyReadQueue(const SpdyReadQueue&) = delete;
SpdyReadQueue& operator=(const SpdyReadQueue&) = delete;
~SpdyReadQueue();
// Returns whether there's anything in the queue.
bool IsEmpty() const;
// Returns the total number of bytes in the queue.
size_t GetTotalSize() const;
// Enqueues the bytes in |buffer|.
void Enqueue(std::unique_ptr<SpdyBuffer> buffer);
// Dequeues up to |len| (which must be positive) bytes into
// |out|. Returns the number of bytes dequeued.
size_t Dequeue(char* out, size_t len);
// Removes all bytes from the queue.
void Clear();
private:
// Class invariant:
// |total_size_| is the sum of GetRemainingSize() of |queue_|'s elements.
base::circular_deque<std::unique_ptr<SpdyBuffer>> queue_;
size_t total_size_ = 0;
};
} // namespace net
#endif // NET_SPDY_SPDY_READ_QUEUE_H_
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