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// Copyright 2014 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.
// An implementation of WebThread in terms of base::MessageLoop and
// base::Thread
#include "components/scheduler/child/webthread_base.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/pending_task.h"
#include "base/threading/platform_thread.h"
#include "components/scheduler/child/single_thread_idle_task_runner.h"
#include "third_party/WebKit/public/platform/WebTraceLocation.h"
namespace scheduler {
class WebThreadBase::TaskObserverAdapter
: public base::MessageLoop::TaskObserver {
public:
TaskObserverAdapter(WebThread::TaskObserver* observer)
: observer_(observer) {}
void WillProcessTask(const base::PendingTask& pending_task) override {
observer_->willProcessTask();
}
void DidProcessTask(const base::PendingTask& pending_task) override {
observer_->didProcessTask();
}
private:
WebThread::TaskObserver* observer_;
};
WebThreadBase::WebThreadBase() {
}
WebThreadBase::~WebThreadBase() {
for (auto& observer_entry : task_observer_map_) {
delete observer_entry.second;
}
}
void WebThreadBase::addTaskObserver(TaskObserver* observer) {
CHECK(isCurrentThread());
std::pair<TaskObserverMap::iterator, bool> result = task_observer_map_.insert(
std::make_pair(observer, static_cast<TaskObserverAdapter*>(NULL)));
if (result.second)
result.first->second = new TaskObserverAdapter(observer);
AddTaskObserverInternal(result.first->second);
}
void WebThreadBase::removeTaskObserver(TaskObserver* observer) {
CHECK(isCurrentThread());
TaskObserverMap::iterator iter = task_observer_map_.find(observer);
if (iter == task_observer_map_.end())
return;
RemoveTaskObserverInternal(iter->second);
delete iter->second;
task_observer_map_.erase(iter);
}
void WebThreadBase::AddTaskObserverInternal(
base::MessageLoop::TaskObserver* observer) {
base::MessageLoop::current()->AddTaskObserver(observer);
}
void WebThreadBase::RemoveTaskObserverInternal(
base::MessageLoop::TaskObserver* observer) {
base::MessageLoop::current()->RemoveTaskObserver(observer);
}
// static
void WebThreadBase::RunWebThreadIdleTask(
scoped_ptr<blink::WebThread::IdleTask> idle_task,
base::TimeTicks deadline) {
idle_task->run((deadline - base::TimeTicks()).InSecondsF());
}
void WebThreadBase::postIdleTask(const blink::WebTraceLocation& web_location,
IdleTask* idle_task) {
tracked_objects::Location location(web_location.functionName(),
web_location.fileName(), -1, nullptr);
GetIdleTaskRunner()->PostIdleTask(
location, base::Bind(&WebThreadBase::RunWebThreadIdleTask,
base::Passed(make_scoped_ptr(idle_task))));
}
void WebThreadBase::postIdleTaskAfterWakeup(
const blink::WebTraceLocation& web_location,
IdleTask* idle_task) {
tracked_objects::Location location(web_location.functionName(),
web_location.fileName(), -1, nullptr);
GetIdleTaskRunner()->PostIdleTaskAfterWakeup(
location, base::Bind(&WebThreadBase::RunWebThreadIdleTask,
base::Passed(make_scoped_ptr(idle_task))));
}
bool WebThreadBase::isCurrentThread() const {
return GetTaskRunner()->BelongsToCurrentThread();
}
} // namespace scheduler
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