Upstream version 7.36.149.0
[platform/framework/web/crosswalk.git] / src / sync / internal_api / protocol_event_buffer.h
1 // Copyright 2014 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 #ifndef SYNC_INTERNAL_API_PROTOCOL_EVENT_BUFFER_H_
6 #define SYNC_INTERNAL_API_PROTOCOL_EVENT_BUFFER_H_
7
8 #include <deque>
9
10 #include "base/memory/scoped_vector.h"
11 #include "sync/base/sync_export.h"
12
13 namespace syncer {
14
15 class ProtocolEvent;
16
17 // A container for ProtocolEvents.
18 //
19 // Stores at most kBufferSize events, then starts dropping the oldest events.
20 class SYNC_EXPORT_PRIVATE ProtocolEventBuffer {
21  public:
22   static const size_t kBufferSize;
23
24   ProtocolEventBuffer();
25   ~ProtocolEventBuffer();
26
27   // Records an event.  May cause the oldest event to be dropped.
28   void RecordProtocolEvent(const ProtocolEvent& event);
29
30   // Returns the buffered contents.  Will not clear the buffer.
31   ScopedVector<ProtocolEvent> GetBufferedProtocolEvents() const;
32
33  private:
34   std::deque<ProtocolEvent*> buffer_;
35   STLElementDeleter<std::deque<ProtocolEvent*> > buffer_deleter_;
36
37   DISALLOW_COPY_AND_ASSIGN(ProtocolEventBuffer);
38 };
39
40 }  // namespace syncer
41
42 #endif  // SYNC_INTERNAL_API_PROTOCOL_EVENT_BUFFER_H_