content/browser/histogram_subscriber.h

   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_BROWSER_HISTOGRAM_SUBSCRIBER_H_
   6 #define CONTENT_BROWSER_HISTOGRAM_SUBSCRIBER_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 namespace content {
  12
  13 // Objects interested in receiving histograms derive from HistogramSubscriber.
  14 class HistogramSubscriber {
  15  public:
  16   virtual ~HistogramSubscriber() {}
  17
  18   // Send number of pending processes to subscriber. |end| is set to true if it
  19   // is the last time. This is called on the UI thread.
  20   virtual void OnPendingProcesses(int sequence_number,
  21                                   int pending_processes,
  22                                   bool end) = 0;
  23
  24   // Send |histogram| back to subscriber.
  25   // This is called on the UI thread.
  26   virtual void OnHistogramDataCollected(
  27       int sequence_number,
  28       const std::vector<std::string>& pickled_histograms) = 0;
  29 };
  30
  31 }  // namespace content
  32
  33 #endif  // CONTENT_BROWSER_HISTOGRAM_SUBSCRIBER_H_