1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
// 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.
#include "chrome/browser/background/extensions/background_mode_optimizer.h"
#include "base/command_line.h"
#include "base/feature_list.h"
#include "base/memory/ptr_util.h"
#include "build/build_config.h"
#include "chrome/browser/background/extensions/background_mode_manager.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/lifetime/application_lifetime.h"
#include "chrome/browser/lifetime/browser_shutdown.h"
#include "chrome/browser/ui/browser_list.h"
#include "chrome/common/chrome_features.h"
#include "chrome/common/chrome_switches.h"
#include "components/keep_alive_registry/keep_alive_registry.h"
BackgroundModeOptimizer::~BackgroundModeOptimizer() {
KeepAliveRegistry::GetInstance()->RemoveObserver(this);
BrowserList::RemoveObserver(this);
}
// static
std::unique_ptr<BackgroundModeOptimizer> BackgroundModeOptimizer::Create() {
// If the --keep-alive-for-test flag is passed, then always keep the browser
// running in the background until the user explicitly terminates it.
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kKeepAliveForTest)) {
return nullptr;
}
#if BUILDFLAG(IS_WIN) || BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
if (base::FeatureList::IsEnabled(features::kBackgroundModeAllowRestart)) {
// Private ctor.
return base::WrapUnique(new BackgroundModeOptimizer());
}
#endif // BUILDFLAG(IS_WIN) || BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
return nullptr;
}
///////////////////////////////////////////////////////////////////////////////
// KeepAliveRegistry implementation
void BackgroundModeOptimizer::OnKeepAliveStateChanged(bool is_keeping_alive) {
// Nothing to do
}
void BackgroundModeOptimizer::OnKeepAliveRestartStateChanged(bool can_restart) {
if (can_restart) {
TryBrowserRestart();
}
}
///////////////////////////////////////////////////////////////////////////////
// BrowserListObserver implementation
void BackgroundModeOptimizer::OnBrowserAdded(Browser* browser) {
browser_was_added_ = true;
}
///////////////////////////////////////////////////////////////////////////////
// private methods
BackgroundModeOptimizer::BackgroundModeOptimizer() {
KeepAliveRegistry::GetInstance()->AddObserver(this);
BrowserList::AddObserver(this);
}
void BackgroundModeOptimizer::TryBrowserRestart() {
// Avoid unecessary restarts. Whether a browser window has been shown is
// our current heuristic to determine if it's worth it.
if (!browser_was_added_) {
DVLOG(1) << "TryBrowserRestart: Cancelled because no browser was added "
<< "since the last restart";
return;
}
// If the application is already shutting down, do not turn it into a restart.
if (browser_shutdown::IsTryingToQuit() ||
browser_shutdown::HasShutdownStarted()) {
DVLOG(1) << "TryBrowserRestart: Cancelled because we are shutting down.";
return;
}
DVLOG(1) << "TryBrowserRestart: Restarting.";
DoRestart();
}
void BackgroundModeOptimizer::DoRestart() {
BackgroundModeManager::set_should_restart_in_background(true);
chrome::AttemptRestart();
}
|
