histogram_fetcher.h revision 5821806d5e7f356e8fa4b058a389a808ea183019
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.h" 11#include "content/common/content_export.h" 12 13class MessageLoop; 14 15namespace content { 16 17// Fetch histogram data asynchronously from the various child processes, into 18// the browser process. This method is used by the metrics services in 19// preparation for a log upload. It contacts all processes, and get them to 20// upload to the browser any/all changes to histograms. When all changes have 21// been acquired, or when the wait time expires (whichever is sooner), post the 22// callback to the specified message loop. Note the callback is posted exactly 23// once. 24CONTENT_EXPORT void FetchHistogramsAsynchronously(MessageLoop* callback_thread, 25 const base::Closure& callback, 26 base::TimeDelta wait_time); 27} // namespace content 28 29#endif // CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_ 30