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// Copyright 2015 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.
#include "chrome/browser/after_startup_task_utils.h"
#include "base/lazy_instance.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram_macros.h"
#include "base/process/process_info.h"
#include "base/rand_util.h"
#include "base/synchronization/cancellation_flag.h"
#include "base/task_runner.h"
#include "base/tracked_objects.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/browser_iterator.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/browser/web_contents_observer.h"
using content::BrowserThread;
using content::WebContents;
using content::WebContentsObserver;
using StartupCompleteFlag = base::CancellationFlag;
namespace {
struct AfterStartupTask {
AfterStartupTask(const tracked_objects::Location& from_here,
const scoped_refptr<base::TaskRunner>& task_runner,
const base::Closure& task)
: from_here(from_here), task_runner(task_runner), task(task) {}
~AfterStartupTask() {}
const tracked_objects::Location from_here;
const scoped_refptr<base::TaskRunner> task_runner;
const base::Closure task;
};
// The flag may be read on any thread, but must only be set on the UI thread.
base::LazyInstance<StartupCompleteFlag>::Leaky g_startup_complete_flag;
// The queue may only be accessed on the UI thread.
base::LazyInstance<std::deque<AfterStartupTask*>>::Leaky g_after_startup_tasks;
bool IsBrowserStartupComplete() {
// Be sure to initialize the LazyInstance on the main thread since the flag
// may only be set on it's initializing thread.
if (g_startup_complete_flag == nullptr)
return false;
return g_startup_complete_flag.Get().IsSet();
}
void RunTask(scoped_ptr<AfterStartupTask> queued_task) {
// We're careful to delete the caller's |task| on the target runner's thread.
DCHECK(queued_task->task_runner->RunsTasksOnCurrentThread());
queued_task->task.Run();
}
void ScheduleTask(scoped_ptr<AfterStartupTask> queued_task) {
// Spread their execution over a brief time.
const int kMinDelaySec = 0;
const int kMaxDelaySec = 10;
scoped_refptr<base::TaskRunner> target_runner = queued_task->task_runner;
tracked_objects::Location from_here = queued_task->from_here;
target_runner->PostDelayedTask(
from_here, base::Bind(&RunTask, base::Passed(queued_task.Pass())),
base::TimeDelta::FromSeconds(base::RandInt(kMinDelaySec, kMaxDelaySec)));
}
void QueueTask(scoped_ptr<AfterStartupTask> queued_task) {
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(QueueTask, base::Passed(queued_task.Pass())));
return;
}
// The flag may have been set while the task to invoke this method
// on the UI thread was inflight.
if (IsBrowserStartupComplete()) {
ScheduleTask(queued_task.Pass());
return;
}
g_after_startup_tasks.Get().push_back(queued_task.release());
}
void SetBrowserStartupIsComplete() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
#if defined(OS_MACOSX) || defined(OS_WIN) || defined(OS_LINUX)
// CurrentProcessInfo::CreationTime() is not available on all platforms.
const base::Time process_creation_time =
base::CurrentProcessInfo::CreationTime();
if (!process_creation_time.is_null()) {
UMA_HISTOGRAM_LONG_TIMES("Startup.AfterStartupTaskDelayedUntilTime",
base::Time::Now() - process_creation_time);
}
#endif // defined(OS_MACOSX) || defined(OS_WIN) || defined(OS_LINUX)
UMA_HISTOGRAM_COUNTS_10000("Startup.AfterStartupTaskCount",
g_after_startup_tasks.Get().size());
g_startup_complete_flag.Get().Set();
for (AfterStartupTask* queued_task : g_after_startup_tasks.Get())
ScheduleTask(make_scoped_ptr(queued_task));
g_after_startup_tasks.Get().clear();
// The shrink_to_fit() method is not available for all of our build targets.
std::deque<AfterStartupTask*>(g_after_startup_tasks.Get())
.swap(g_after_startup_tasks.Get());
}
// Observes the first visible page load and sets the startup complete
// flag accordingly.
class StartupObserver : public WebContentsObserver, public base::NonThreadSafe {
public:
StartupObserver() : weak_factory_(this) {}
~StartupObserver() override { DCHECK(IsBrowserStartupComplete()); }
void Start();
private:
void OnStartupComplete() {
DCHECK(CalledOnValidThread());
SetBrowserStartupIsComplete();
delete this;
}
void OnFailsafeTimeout() { OnStartupComplete(); }
// WebContentsObserver overrides
void DidFinishLoad(content::RenderFrameHost* render_frame_host,
const GURL& validated_url) override {
if (!render_frame_host->GetParent())
OnStartupComplete();
}
void DidFailLoad(content::RenderFrameHost* render_frame_host,
const GURL& validated_url,
int error_code,
const base::string16& error_description,
bool was_ignored_by_handler) override {
if (!render_frame_host->GetParent())
OnStartupComplete();
}
void WebContentsDestroyed() override { OnStartupComplete(); }
base::WeakPtrFactory<StartupObserver> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(StartupObserver);
};
void StartupObserver::Start() {
// Signal completion quickly when there is no first page to load.
const int kShortDelaySecs = 3;
base::TimeDelta delay = base::TimeDelta::FromSeconds(kShortDelaySecs);
#if !defined(OS_ANDROID)
WebContents* contents = nullptr;
for (chrome::BrowserIterator iter; !iter.done(); iter.Next()) {
contents = (*iter)->tab_strip_model()->GetActiveWebContents();
if (contents && contents->GetMainFrame() &&
contents->GetMainFrame()->GetVisibilityState() ==
blink::WebPageVisibilityStateVisible) {
break;
}
}
if (contents) {
// Give the page time to finish loading.
const int kLongerDelayMins = 3;
Observe(contents);
delay = base::TimeDelta::FromMinutes(kLongerDelayMins);
}
#else
// Startup completion is signaled via AfterStartupTaskUtils.java,
// this is just a failsafe timeout.
const int kLongerDelayMins = 3;
delay = base::TimeDelta::FromMinutes(kLongerDelayMins);
#endif // !defined(OS_ANDROID)
BrowserThread::PostDelayedTask(BrowserThread::UI, FROM_HERE,
base::Bind(&StartupObserver::OnFailsafeTimeout,
weak_factory_.GetWeakPtr()),
delay);
}
} // namespace
void AfterStartupTaskUtils::StartMonitoringStartup() {
// The observer is self-deleting.
(new StartupObserver)->Start();
}
void AfterStartupTaskUtils::PostTask(
const tracked_objects::Location& from_here,
const scoped_refptr<base::TaskRunner>& task_runner,
const base::Closure& task) {
if (IsBrowserStartupComplete()) {
task_runner->PostTask(from_here, task);
return;
}
scoped_ptr<AfterStartupTask> queued_task(
new AfterStartupTask(from_here, task_runner, task));
QueueTask(queued_task.Pass());
}
void AfterStartupTaskUtils::SetBrowserStartupIsComplete() {
::SetBrowserStartupIsComplete();
}
bool AfterStartupTaskUtils::IsBrowserStartupComplete() {
return ::IsBrowserStartupComplete();
}
void AfterStartupTaskUtils::UnsafeResetForTesting() {
DCHECK(g_after_startup_tasks.Get().empty());
if (!IsBrowserStartupComplete())
return;
g_startup_complete_flag.Get().UnsafeResetForTesting();
DCHECK(!IsBrowserStartupComplete());
}
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