1 // Copyright (c) 2012 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 CONTENT_CHILD_HISTOGRAM_MESSAGE_FILTER_H_ 6 #define CONTENT_CHILD_HISTOGRAM_MESSAGE_FILTER_H_ 7 8 #include <string> 9 #include <vector> 10 11 #include "base/basictypes.h" 12 #include "base/memory/scoped_ptr.h" 13 #include "ipc/message_filter.h" 14 15 namespace base { 16 class HistogramDeltaSerialization; 17 class MessageLoopProxy; 18 } // namespace base 19 20 namespace content { 21 22 class ChildHistogramMessageFilter : public IPC::MessageFilter { 23 public: 24 ChildHistogramMessageFilter(); 25 26 // IPC::MessageFilter implementation. 27 virtual void OnFilterAdded(IPC::Sender* sender) OVERRIDE; 28 virtual void OnFilterRemoved() OVERRIDE; 29 virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE; 30 31 void SendHistograms(int sequence_number); 32 33 private: 34 typedef std::vector<std::string> HistogramPickledList; 35 36 virtual ~ChildHistogramMessageFilter(); 37 38 // Message handlers. 39 virtual void OnGetChildHistogramData(int sequence_number); 40 41 // Extract snapshot data and then send it off the the Browser process. 42 // Send only a delta to what we have already sent. 43 void UploadAllHistograms(int sequence_number); 44 45 IPC::Sender* sender_; 46 47 scoped_refptr<base::MessageLoopProxy> io_message_loop_; 48 49 // Prepares histogram deltas for transmission. 50 scoped_ptr<base::HistogramDeltaSerialization> histogram_delta_serialization_; 51 52 DISALLOW_COPY_AND_ASSIGN(ChildHistogramMessageFilter); 53 }; 54 55 } // namespace content 56 57 #endif // CONTENT_CHILD_HISTOGRAM_MESSAGE_FILTER_H_ 58
