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// Copyright (c) 2009 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.
#ifndef NET_FLIP_FLIP_IO_BUFFER_H_
#define NET_FLIP_FLIP_IO_BUFFER_H_
#include "base/ref_counted.h"
#include "net/base/io_buffer.h"
namespace net {
class FlipStream;
// A class for managing FLIP IO buffers. These buffers need to be prioritized
// so that the FlipSession sends them in the right order. Further, they need
// to track the FlipStream which they are associated with so that incremental
// completion of the IO can notify the appropriate stream of completion.
class FlipIOBuffer {
public:
// Constructor
// |buffer| is the actual data buffer.
// |priority| is the priority of this buffer. Lower numbers are higher
// priority.
// |stream| is a pointer to the stream which is managing this buffer.
FlipIOBuffer(IOBufferWithSize* buffer, int priority, FlipStream* stream)
: buffer_(buffer),
priority_(priority),
position_(++order_),
stream_(stream) {
}
FlipIOBuffer() : priority_(0), stream_(NULL) {}
// Accessors.
IOBuffer* buffer() const { return buffer_; }
size_t size() const { return buffer_->size(); }
void release() { buffer_ = NULL; }
int priority() const { return priority_; }
FlipStream* stream() const { return stream_; }
// Comparison operator to support sorting.
bool operator<(const FlipIOBuffer& other) const {
if (priority_ != other.priority_)
return priority_ > other.priority_;
return position_ > other.position_;
}
private:
scoped_refptr<IOBufferWithSize> buffer_;
int priority_;
uint64 position_;
FlipStream* stream_;
static uint64 order_; // Maintains a FIFO order for equal priorities.
};
} // namespace net
#endif // NET_FLIP_FLIP_IO_BUFFER_H_
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