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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_BACKGROUND_EXTENSIONS_BACKGROUND_MODE_OPTIMIZER_H_
#define CHROME_BROWSER_BACKGROUND_EXTENSIONS_BACKGROUND_MODE_OPTIMIZER_H_
#include <memory>
#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:
// Creates a new BackgroundModeOptimizer. Can return null if optimizations
// are not supported.
static std::unique_ptr<BackgroundModeOptimizer> Create();
BackgroundModeOptimizer(const BackgroundModeOptimizer&) = delete;
BackgroundModeOptimizer& operator=(const BackgroundModeOptimizer&) = delete;
~BackgroundModeOptimizer() override;
// 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;
// Use `Create()` above.
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();
bool browser_was_added_ = false;
};
#endif // CHROME_BROWSER_BACKGROUND_EXTENSIONS_BACKGROUND_MODE_OPTIMIZER_H_
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