| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CHROME_BROWSER_BACKGROUND_BACKGROUND_MODE_OPTIMIZER_H_ |
| #define CHROME_BROWSER_BACKGROUND_BACKGROUND_MODE_OPTIMIZER_H_ |
| |
| #include <memory> |
| |
| #include "base/macros.h" |
| #include "base/time/time.h" |
| #include "chrome/browser/ui/browser_list_observer.h" |
| #include "components/keep_alive_registry/keep_alive_state_observer.h" |
| |
| class Browser; |
| |
| // BackgroundModeOptimizer is responsible for applying some optimizations to |
| // save resources (memory) when Chrome runs in background-only mode. |
| // It tries to restart the browser to release accumulated memory when it |
| // is considered non distruptive. |
| class BackgroundModeOptimizer : public KeepAliveStateObserver, |
| BrowserListObserver { |
| public: |
| ~BackgroundModeOptimizer() override; |
| |
| // Creates a new BackgroundModeOptimizer. Can return null if optimizations |
| // are not supported. |
| static std::unique_ptr<BackgroundModeOptimizer> Create(); |
| |
| // KeepAliveStateObserver implementation |
| void OnKeepAliveStateChanged(bool is_keeping_alive) override; |
| void OnKeepAliveRestartStateChanged(bool can_restart) override; |
| |
| // BrowserListObserver implementation. |
| void OnBrowserAdded(Browser* browser) override; |
| |
| private: |
| friend class DummyBackgroundModeOptimizer; |
| |
| BackgroundModeOptimizer(); |
| |
| // Calls DoRestart() if the current state of the process allows it. |
| void TryBrowserRestart(); |
| |
| // Stop the browser and restart it in background mode. |
| // Virtual for testing purposes. |
| virtual void DoRestart(); |
| |
| // Used for a histogram that records the duration of a session before |
| // browser got restarted into background mode. |
| base::TimeTicks creation_time_; |
| |
| bool browser_was_added_; |
| |
| DISALLOW_COPY_AND_ASSIGN(BackgroundModeOptimizer); |
| }; |
| |
| #endif // CHROME_BROWSER_BACKGROUND_BACKGROUND_MODE_OPTIMIZER_H_ |