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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 "content/child/webthread_impl.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/message_loop/message_loop.h"
#include "base/pending_task.h"
#include "base/threading/platform_thread.h"
namespace content {
WebThreadBase::WebThreadBase() {}
WebThreadBase::~WebThreadBase() {}
class WebThreadBase::TaskObserverAdapter
: public base::MessageLoop::TaskObserver {
public:
TaskObserverAdapter(WebThread::TaskObserver* observer)
: observer_(observer) {}
virtual void WillProcessTask(const base::PendingTask& pending_task) OVERRIDE {
observer_->willProcessTask();
}
virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE {
observer_->didProcessTask();
}
private:
WebThread::TaskObserver* observer_;
};
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);
base::MessageLoop::current()->AddTaskObserver(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;
base::MessageLoop::current()->RemoveTaskObserver(iter->second);
delete iter->second;
task_observer_map_.erase(iter);
}
WebThreadImpl::WebThreadImpl(const char* name)
: thread_(new base::Thread(name)) {
thread_->Start();
}
void WebThreadImpl::postTask(Task* task) {
thread_->message_loop()->PostTask(
FROM_HERE, base::Bind(&blink::WebThread::Task::run, base::Owned(task)));
}
void WebThreadImpl::postDelayedTask(Task* task, long long delay_ms) {
thread_->message_loop()->PostDelayedTask(
FROM_HERE,
base::Bind(&blink::WebThread::Task::run, base::Owned(task)),
base::TimeDelta::FromMilliseconds(delay_ms));
}
void WebThreadImpl::enterRunLoop() {
CHECK(isCurrentThread());
CHECK(!thread_->message_loop()->is_running()); // We don't support nesting.
thread_->message_loop()->Run();
}
void WebThreadImpl::exitRunLoop() {
CHECK(isCurrentThread());
CHECK(thread_->message_loop()->is_running());
thread_->message_loop()->Quit();
}
bool WebThreadImpl::isCurrentThread() const {
return thread_->thread_id() == base::PlatformThread::CurrentId();
}
blink::PlatformThreadId WebThreadImpl::threadId() const {
return thread_->thread_id();
}
WebThreadImpl::~WebThreadImpl() {
thread_->Stop();
}
WebThreadImplForMessageLoop::WebThreadImplForMessageLoop(
base::MessageLoopProxy* message_loop)
: message_loop_(message_loop),
thread_id_(base::PlatformThread::CurrentId()) {}
void WebThreadImplForMessageLoop::postTask(Task* task) {
message_loop_->PostTask(
FROM_HERE, base::Bind(&blink::WebThread::Task::run, base::Owned(task)));
}
void WebThreadImplForMessageLoop::postDelayedTask(Task* task,
long long delay_ms) {
message_loop_->PostDelayedTask(
FROM_HERE,
base::Bind(&blink::WebThread::Task::run, base::Owned(task)),
base::TimeDelta::FromMilliseconds(delay_ms));
}
void WebThreadImplForMessageLoop::enterRunLoop() {
CHECK(isCurrentThread());
// We don't support nesting.
CHECK(!base::MessageLoop::current()->is_running());
base::MessageLoop::current()->Run();
}
void WebThreadImplForMessageLoop::exitRunLoop() {
CHECK(isCurrentThread());
CHECK(base::MessageLoop::current()->is_running());
base::MessageLoop::current()->Quit();
}
bool WebThreadImplForMessageLoop::isCurrentThread() const {
return message_loop_->BelongsToCurrentThread();
}
blink::PlatformThreadId WebThreadImplForMessageLoop::threadId() const {
return thread_id_;
}
WebThreadImplForMessageLoop::~WebThreadImplForMessageLoop() {}
} // namespace content
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