cef/libcef/browser/browser_message_loop.cc

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// Copyright (c) 2012 The Chromium Embedded Framework 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 "libcef/browser/browser_message_loop.h"
#include "libcef/common/app_manager.h"
#include "base/memory/ptr_util.h"
#include "base/message_loop/message_pump.h"
#include "base/message_loop/message_pump_for_ui.h"
#if BUILDFLAG(IS_MAC)
#include "base/mac/scoped_nsautorelease_pool.h"
#include "base/message_loop/message_pump_mac.h"
#endif
#include "content/public/browser/browser_thread.h"
namespace {
// MessagePump implementation that delegates to OnScheduleMessagePumpWork() for
// scheduling.
class MessagePumpExternal : public base::MessagePumpForUI {
public:
MessagePumpExternal(float max_time_slice,
CefRefPtr<CefBrowserProcessHandler> handler)
: max_time_slice_(max_time_slice), handler_(handler) {}
void Run(Delegate* delegate) override {
base::TimeTicks start = base::TimeTicks::Now();
while (true) {
#if BUILDFLAG(IS_MAC)
base::mac::ScopedNSAutoreleasePool autorelease_pool;
#endif
base::TimeTicks next_run_time; // is_null()
const bool has_more_work = DirectRunWork(delegate, &next_run_time);
if (!has_more_work)
break;
if (next_run_time.is_null()) {
// We have more work that should run immediately.
next_run_time = base::TimeTicks::Now();
}
const base::TimeDelta& delta = next_run_time - start;
if (delta.InSecondsF() > max_time_slice_)
break;
}
}
void Quit() override {}
void ScheduleWork() override { handler_->OnScheduleMessagePumpWork(0); }
void ScheduleDelayedWork(
const Delegate::NextWorkInfo& next_work_info) override {
const base::TimeDelta& delta =
next_work_info.delayed_run_time - next_work_info.recent_now;
handler_->OnScheduleMessagePumpWork(delta.InMilliseconds());
}
private:
static bool DirectRunWork(Delegate* delegate,
base::TimeTicks* next_run_time) {
bool more_immediate_work = false;
bool more_idle_work = false;
bool more_delayed_work = false;
Delegate::NextWorkInfo next_work_info = delegate->DoWork();
// is_immediate() returns true if the next task is ready right away.
more_immediate_work = next_work_info.is_immediate();
if (!more_immediate_work) {
// Check the next PendingTask's |delayed_run_time|.
// is_max() returns true if there are no more immediate nor delayed tasks.
more_delayed_work = !next_work_info.delayed_run_time.is_max();
if (more_delayed_work) {
// The only remaining work that we know about is the PendingTask.
// Consider the run time for that task in the time slice calculation.
*next_run_time = next_work_info.delayed_run_time;
}
}
if (!more_immediate_work && !more_delayed_work) {
// DoIdleWork() returns true if idle work was all done.
more_idle_work = !delegate->DoIdleWork();
}
return more_immediate_work || more_idle_work || more_delayed_work;
}
const float max_time_slice_;
CefRefPtr<CefBrowserProcessHandler> handler_;
};
CefRefPtr<CefBrowserProcessHandler> GetBrowserProcessHandler() {
CefRefPtr<CefApp> app = CefAppManager::Get()->GetApplication();
if (app)
return app->GetBrowserProcessHandler();
return nullptr;
}
std::unique_ptr<base::MessagePump> MessagePumpFactoryForUI() {
if (!content::BrowserThread::IsThreadInitialized(
content::BrowserThread::UI) ||
content::BrowserThread::CurrentlyOn(content::BrowserThread::UI)) {
CefRefPtr<CefBrowserProcessHandler> handler = GetBrowserProcessHandler();
if (handler)
return std::make_unique<MessagePumpExternal>(0.01f, handler);
}
#if BUILDFLAG(IS_MAC)
return base::MessagePumpMac::Create();
#else
return std::make_unique<base::MessagePumpForUI>();
#endif
}
} // namespace
void InitExternalMessagePumpFactoryForUI() {
base::MessagePump::OverrideMessagePumpForUIFactory(MessagePumpFactoryForUI);
}