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// Copyright (c) 2012 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 CONTENT_CHILD_HISTOGRAM_MESSAGE_FILTER_H_
#define CONTENT_CHILD_HISTOGRAM_MESSAGE_FILTER_H_
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "ipc/message_filter.h"
namespace base {
class HistogramDeltaSerialization;
class MessageLoopProxy;
} // namespace base
namespace content {
class ChildHistogramMessageFilter : public IPC::MessageFilter {
public:
ChildHistogramMessageFilter();
// IPC::MessageFilter implementation.
virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
virtual void OnFilterRemoved() OVERRIDE;
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
void SendHistograms(int sequence_number);
private:
typedef std::vector<std::string> HistogramPickledList;
virtual ~ChildHistogramMessageFilter();
// Message handlers.
virtual void OnGetChildHistogramData(int sequence_number);
// Extract snapshot data and then send it off the the Browser process.
// Send only a delta to what we have already sent.
void UploadAllHistograms(int sequence_number);
IPC::Channel* channel_;
scoped_refptr<base::MessageLoopProxy> io_message_loop_;
// Prepares histogram deltas for transmission.
scoped_ptr<base::HistogramDeltaSerialization> histogram_delta_serialization_;
DISALLOW_COPY_AND_ASSIGN(ChildHistogramMessageFilter);
};
} // namespace content
#endif // CONTENT_CHILD_HISTOGRAM_MESSAGE_FILTER_H_
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