content/public/browser/histogram_fetcher.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_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_
   6 #define CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/callback.h"
  10 #include "base/time/time.h"
  11 #include "content/common/content_export.h"
  12
  13 namespace base {
  14 class MessageLoop;
  15 }
  16
  17 namespace content {
  18
  19 // Fetch histogram data asynchronously from the various child processes, into
  20 // the browser process. This method is used by the metrics services in
  21 // preparation for a log upload. It contacts all processes, and get them to
  22 // upload to the browser any/all changes to histograms.  When all changes have
  23 // been acquired, or when the wait time expires (whichever is sooner), post the
  24 // callback to the specified message loop. Note the callback is posted exactly
  25 // once.
  26 CONTENT_EXPORT void FetchHistogramsAsynchronously(
  27     base::MessageLoop* callback_thread,
  28     const base::Closure& callback,
  29     base::TimeDelta wait_time);
  30
  31 }  // namespace content
  32
  33 #endif  // CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_