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| 1 // Copyright 2016 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 #include "chrome/browser/background/background_mode_optimizer.h" |
| 6 |
| 7 #include "base/command_line.h" |
| 8 #include "base/feature_list.h" |
| 9 #include "base/memory/ptr_util.h" |
| 10 #include "chrome/browser/background/background_mode_manager.h" |
| 11 #include "chrome/browser/browser_process.h" |
| 12 #include "chrome/browser/browser_shutdown.h" |
| 13 #include "chrome/browser/lifetime/application_lifetime.h" |
| 14 #include "chrome/browser/lifetime/keep_alive_registry.h" |
| 15 #include "chrome/browser/ui/browser_list.h" |
| 16 #include "chrome/common/chrome_features.h" |
| 17 #include "chrome/common/chrome_switches.h" |
| 18 |
| 19 BackgroundModeOptimizer::~BackgroundModeOptimizer() { |
| 20 KeepAliveRegistry::GetInstance()->RemoveObserver(this); |
| 21 BrowserList::RemoveObserver(this); |
| 22 } |
| 23 |
| 24 // static |
| 25 std::unique_ptr<BackgroundModeOptimizer> BackgroundModeOptimizer::Create() { |
| 26 // If the -keep-alive-for-test flag is passed, then always keep chrome running |
| 27 // in the background until the user explicitly terminates it. |
| 28 if (base::CommandLine::ForCurrentProcess()->HasSwitch( |
| 29 switches::kKeepAliveForTest)) |
| 30 return nullptr; |
| 31 |
| 32 #if defined(OS_WIN) || defined(OS_LINUX) |
| 33 if (base::FeatureList::IsEnabled(features::kBackgroundModeAllowRestart)) |
| 34 return base::WrapUnique(new BackgroundModeOptimizer()); |
| 35 #endif // defined(OS_WIN) || defined(OS_LINUX) |
| 36 |
| 37 return nullptr; |
| 38 } |
| 39 |
| 40 /////////////////////////////////////////////////////////////////////////////// |
| 41 // KeepAliveRegistry implementation |
| 42 |
| 43 void BackgroundModeOptimizer::OnKeepAliveStateChanged(bool is_keeping_alive) { |
| 44 // Nothing to do |
| 45 } |
| 46 |
| 47 void BackgroundModeOptimizer::OnKeepAliveRestartStateChanged(bool can_restart) { |
| 48 if (can_restart) |
| 49 TryBrowserRestart(); |
| 50 } |
| 51 /////////////////////////////////////////////////////////////////////////////// |
| 52 // BrowserListObserver implementation |
| 53 |
| 54 void BackgroundModeOptimizer::OnBrowserAdded(Browser* browser) { |
| 55 browser_was_added_ = true; |
| 56 } |
| 57 |
| 58 /////////////////////////////////////////////////////////////////////////////// |
| 59 // private methods |
| 60 |
| 61 BackgroundModeOptimizer::BackgroundModeOptimizer() : browser_was_added_(false) { |
| 62 KeepAliveRegistry::GetInstance()->AddObserver(this); |
| 63 BrowserList::AddObserver(this); |
| 64 } |
| 65 |
| 66 void BackgroundModeOptimizer::TryBrowserRestart() { |
| 67 // Avoid unecessary restarts. Whether a browser window has been shown is |
| 68 // our current heuristic to determine if it's worth it. |
| 69 if (!browser_was_added_) { |
| 70 DVLOG(1) << "TryBrowserRestart: Cancelled because no browser was added " |
| 71 << "since the last restart"; |
| 72 return; |
| 73 } |
| 74 |
| 75 // If the application is already shutting down, do not turn it into a restart. |
| 76 if (browser_shutdown::IsTryingToQuit() || |
| 77 browser_shutdown::GetShutdownType() != browser_shutdown::NOT_VALID) { |
| 78 DVLOG(1) << "TryBrowserRestart: Cancelled because we are shutting down."; |
| 79 return; |
| 80 } |
| 81 |
| 82 DVLOG(1) << "TryBrowserRestart: Restarting."; |
| 83 DoRestart(); |
| 84 } |
| 85 |
| 86 void BackgroundModeOptimizer::DoRestart() { |
| 87 BackgroundModeManager::should_restart_in_background(true); |
| 88 chrome::AttemptRestart(); |
| 89 } |
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