gin/modules/timer.cc

   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 #include "gin/modules/timer.h"
   6
   7 #include "base/bind.h"
   8 #include "gin/object_template_builder.h"
   9 #include "gin/per_context_data.h"
  10
  11 namespace gin {
  12
  13 namespace {
  14
  15 v8::Handle<v8::String> GetHiddenPropertyName(v8::Isolate* isolate) {
  16   return gin::StringToSymbol(isolate, "::gin::Timer");
  17 }
  18
  19 }  // namespace
  20
  21 // Timer =======================================================================
  22
  23 gin::WrapperInfo Timer::kWrapperInfo = { gin::kEmbedderNativeGin };
  24
  25 // static
  26 Handle<Timer> Timer::Create(TimerType type, v8::Isolate* isolate, int delay_ms,
  27                             v8::Handle<v8::Function> function) {
  28   return CreateHandle(isolate, new Timer(isolate, type == TYPE_REPEATING,
  29                                          delay_ms, function));
  30 }
  31
  32 ObjectTemplateBuilder Timer::GetObjectTemplateBuilder(v8::Isolate* isolate) {
  33   // We use Unretained() here because we directly own timer_, so we know it will
  34   // be alive when these methods are called.
  35   return Wrappable<Timer>::GetObjectTemplateBuilder(isolate)
  36       .SetMethod("cancel",
  37                  base::Bind(&base::Timer::Stop, base::Unretained(&timer_)))
  38       .SetMethod("reset",
  39                  base::Bind(&base::Timer::Reset, base::Unretained(&timer_)));
  40 }
  41
  42 Timer::Timer(v8::Isolate* isolate, bool repeating, int delay_ms,
  43              v8::Handle<v8::Function> function)
  44     : timer_(false, repeating),
  45       runner_(PerContextData::From(
  46           isolate->GetCurrentContext())->runner()->GetWeakPtr()),
  47       weak_factory_(this) {
  48   GetWrapper(runner_->GetContextHolder()->isolate())->SetHiddenValue(
  49       GetHiddenPropertyName(isolate), function);
  50   timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(delay_ms),
  51                base::Bind(&Timer::OnTimerFired, weak_factory_.GetWeakPtr()));
  52 }
  53
  54 Timer::~Timer() {
  55 }
  56
  57 void Timer::OnTimerFired() {
  58   // This can happen in spite of the weak callback because it is possible for
  59   // a gin::Handle<> to keep this object alive past when the isolate it is part
  60   // of is destroyed.
  61   if (!runner_.get()) {
  62     return;
  63   }
  64
  65   Runner::Scope scope(runner_.get());
  66   v8::Isolate* isolate = runner_->GetContextHolder()->isolate();
  67   v8::Handle<v8::Function> function = v8::Handle<v8::Function>::Cast(
  68       GetWrapper(isolate)->GetHiddenValue(GetHiddenPropertyName(isolate)));
  69   runner_->Call(function, v8::Undefined(isolate), 0, NULL);
  70 }
  71
  72
  73 // TimerModule =================================================================
  74
  75 const char TimerModule::kName[] = "timer";
  76 WrapperInfo TimerModule::kWrapperInfo = { kEmbedderNativeGin };
  77
  78 // static
  79 Handle<TimerModule> TimerModule::Create(v8::Isolate* isolate) {
  80   return CreateHandle(isolate, new TimerModule());
  81 }
  82
  83 // static
  84 v8::Local<v8::Value> TimerModule::GetModule(v8::Isolate* isolate) {
  85   return Create(isolate)->GetWrapper(isolate);
  86 }
  87
  88 TimerModule::TimerModule() {
  89 }
  90
  91 TimerModule::~TimerModule() {
  92 }
  93
  94 ObjectTemplateBuilder TimerModule::GetObjectTemplateBuilder(
  95     v8::Isolate* isolate) {
  96   return Wrappable<TimerModule>::GetObjectTemplateBuilder(isolate)
  97       .SetMethod("createOneShot",
  98                  base::Bind(&Timer::Create, Timer::TYPE_ONE_SHOT))
  99       .SetMethod("createRepeating",
 100                  base::Bind(&Timer::Create, Timer::TYPE_REPEATING));
 101 }
 102
 103 }  // namespace gin