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      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 COMPONENTS_TRACING_CHILD_TRACE_MESSAGE_FILTER_H_
      6 #define COMPONENTS_TRACING_CHILD_TRACE_MESSAGE_FILTER_H_
      7 
      8 #include "base/bind.h"
      9 #include "base/memory/ref_counted_memory.h"
     10 #include "ipc/ipc_channel_proxy.h"
     11 
     12 namespace base {
     13 class MessageLoopProxy;
     14 }
     15 
     16 namespace tracing {
     17 
     18 // This class sends and receives trace messages on child processes.
     19 class ChildTraceMessageFilter : public IPC::ChannelProxy::MessageFilter {
     20  public:
     21   explicit ChildTraceMessageFilter(base::MessageLoopProxy* ipc_message_loop);
     22 
     23   // IPC::ChannelProxy::MessageFilter implementation.
     24   virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
     25   virtual void OnFilterRemoved() OVERRIDE;
     26   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
     27 
     28  protected:
     29   virtual ~ChildTraceMessageFilter();
     30 
     31  private:
     32   // Message handlers.
     33   void OnBeginTracing(const std::string& category_filter_str,
     34                       base::TimeTicks browser_time,
     35                       int mode);
     36   void OnEndTracing();
     37   void OnGetTraceBufferPercentFull();
     38   void OnSetWatchEvent(const std::string& category_name,
     39                        const std::string& event_name);
     40   void OnCancelWatchEvent();
     41 
     42   // Callback from trace subsystem.
     43   void OnTraceDataCollected(
     44       const scoped_refptr<base::RefCountedString>& events_str_ptr);
     45   void OnTraceNotification(int notification);
     46 
     47   IPC::Channel* channel_;
     48   base::MessageLoopProxy* ipc_message_loop_;
     49 
     50   DISALLOW_COPY_AND_ASSIGN(ChildTraceMessageFilter);
     51 };
     52 
     53 }  // namespace tracing
     54 
     55 #endif  // COMPONENTS_TRACING_CHILD_TRACE_MESSAGE_FILTER_H_
     56