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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SYNC_ENGINE_EVENTS_PROTOCOL_EVENT_BUFFER_H_
#define COMPONENTS_SYNC_ENGINE_EVENTS_PROTOCOL_EVENT_BUFFER_H_
#include <stddef.h>
#include <memory>
#include <vector>
#include "base/containers/circular_deque.h"
namespace syncer {
class ProtocolEvent;
// A container for ProtocolEvents.
//
// Stores some maximum number of events (kDefaultBufferSize, unless overridden
// by command-line param), then starts dropping the oldest events.
class ProtocolEventBuffer {
public:
static constexpr size_t kDefaultBufferSize = 6;
ProtocolEventBuffer();
ProtocolEventBuffer(const ProtocolEventBuffer&) = delete;
ProtocolEventBuffer& operator=(const ProtocolEventBuffer&) = delete;
~ProtocolEventBuffer();
// Records an event. May cause the oldest event to be dropped.
void RecordProtocolEvent(const ProtocolEvent& event);
// Returns copies of the buffered contents. Will not clear the buffer.
std::vector<std::unique_ptr<ProtocolEvent>> GetBufferedProtocolEvents() const;
private:
const size_t buffer_size_;
base::circular_deque<std::unique_ptr<ProtocolEvent>> buffer_;
};
} // namespace syncer
#endif // COMPONENTS_SYNC_ENGINE_EVENTS_PROTOCOL_EVENT_BUFFER_H_
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