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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // An implementation of WebThread in terms of base::MessageLoop and
      6 // base::Thread
      7 
      8 #include "webkit/child/webthread_impl.h"
      9 
     10 #include "base/bind.h"
     11 #include "base/bind_helpers.h"
     12 #include "base/message_loop/message_loop.h"
     13 #include "base/pending_task.h"
     14 #include "base/threading/platform_thread.h"
     15 
     16 namespace webkit_glue {
     17 
     18 WebThreadBase::WebThreadBase() { }
     19 WebThreadBase::~WebThreadBase() { }
     20 
     21 class WebThreadBase::TaskObserverAdapter :
     22     public base::MessageLoop::TaskObserver {
     23  public:
     24   TaskObserverAdapter(WebThread::TaskObserver* observer)
     25       : observer_(observer) { }
     26 
     27   virtual void WillProcessTask(const base::PendingTask& pending_task) OVERRIDE {
     28     observer_->willProcessTask();
     29   }
     30 
     31   virtual void DidProcessTask(const base::PendingTask& pending_task) OVERRIDE {
     32     observer_->didProcessTask();
     33   }
     34 
     35 private:
     36   WebThread::TaskObserver* observer_;
     37 };
     38 
     39 void WebThreadBase::addTaskObserver(TaskObserver* observer) {
     40   CHECK(isCurrentThread());
     41   std::pair<TaskObserverMap::iterator, bool> result = task_observer_map_.insert(
     42       std::make_pair(observer, static_cast<TaskObserverAdapter*>(NULL)));
     43   if (result.second)
     44     result.first->second = new TaskObserverAdapter(observer);
     45   base::MessageLoop::current()->AddTaskObserver(result.first->second);
     46 }
     47 
     48 void WebThreadBase::removeTaskObserver(TaskObserver* observer) {
     49   CHECK(isCurrentThread());
     50   TaskObserverMap::iterator iter = task_observer_map_.find(observer);
     51   if (iter == task_observer_map_.end())
     52     return;
     53   base::MessageLoop::current()->RemoveTaskObserver(iter->second);
     54   delete iter->second;
     55   task_observer_map_.erase(iter);
     56 }
     57 
     58 WebThreadImpl::WebThreadImpl(const char* name)
     59     : thread_(new base::Thread(name)) {
     60   thread_->Start();
     61 }
     62 
     63 void WebThreadImpl::postTask(Task* task) {
     64   thread_->message_loop()->PostTask(
     65       FROM_HERE, base::Bind(&blink::WebThread::Task::run, base::Owned(task)));
     66 }
     67 
     68 void WebThreadImpl::postDelayedTask(
     69     Task* task, long long delay_ms) {
     70   thread_->message_loop()->PostDelayedTask(
     71       FROM_HERE,
     72       base::Bind(&blink::WebThread::Task::run, base::Owned(task)),
     73       base::TimeDelta::FromMilliseconds(delay_ms));
     74 }
     75 
     76 void WebThreadImpl::enterRunLoop() {
     77   CHECK(isCurrentThread());
     78   CHECK(!thread_->message_loop()->is_running()); // We don't support nesting.
     79   thread_->message_loop()->Run();
     80 }
     81 
     82 void WebThreadImpl::exitRunLoop() {
     83   CHECK(isCurrentThread());
     84   CHECK(thread_->message_loop()->is_running());
     85   thread_->message_loop()->Quit();
     86 }
     87 
     88 bool WebThreadImpl::isCurrentThread() const {
     89   return thread_->thread_id() == base::PlatformThread::CurrentId();
     90 }
     91 
     92 WebThreadImpl::~WebThreadImpl() {
     93   thread_->Stop();
     94 }
     95 
     96 WebThreadImplForMessageLoop::WebThreadImplForMessageLoop(
     97     base::MessageLoopProxy* message_loop)
     98     : message_loop_(message_loop) {
     99 }
    100 
    101 void WebThreadImplForMessageLoop::postTask(Task* task) {
    102   message_loop_->PostTask(
    103       FROM_HERE, base::Bind(&blink::WebThread::Task::run, base::Owned(task)));
    104 }
    105 
    106 void WebThreadImplForMessageLoop::postDelayedTask(
    107     Task* task, long long delay_ms) {
    108   message_loop_->PostDelayedTask(
    109       FROM_HERE,
    110       base::Bind(&blink::WebThread::Task::run, base::Owned(task)),
    111       base::TimeDelta::FromMilliseconds(delay_ms));
    112 }
    113 
    114 void WebThreadImplForMessageLoop::enterRunLoop() {
    115   CHECK(isCurrentThread());
    116   CHECK(!base::MessageLoop::current()
    117             ->is_running());  // We don't support nesting.
    118   base::MessageLoop::current()->Run();
    119 }
    120 
    121 void WebThreadImplForMessageLoop::exitRunLoop() {
    122   CHECK(isCurrentThread());
    123   CHECK(base::MessageLoop::current()->is_running());
    124   base::MessageLoop::current()->Quit();
    125 }
    126 
    127 bool WebThreadImplForMessageLoop::isCurrentThread() const {
    128   return message_loop_->BelongsToCurrentThread();
    129 }
    130 
    131 WebThreadImplForMessageLoop::~WebThreadImplForMessageLoop() {
    132 }
    133 
    134 }
    135