mojo/public/bindings/js/waiting_callback.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 "mojo/public/bindings/js/waiting_callback.h"
   6
   7 #include "gin/per_context_data.h"
   8 #include "gin/per_isolate_data.h"
   9
  10 namespace mojo {
  11 namespace js {
  12
  13 namespace {
  14
  15 v8::Handle<v8::String> GetHiddenPropertyName(v8::Isolate* isolate) {
  16   return gin::StringToSymbol(isolate, "::mojo::js::WaitingCallback");
  17 }
  18
  19 }  // namespace
  20
  21 WaitingCallback::WaitingCallback(v8::Isolate* isolate,
  22                                  v8::Handle<v8::Function> callback)
  23       : wait_id_() {
  24   v8::Handle<v8::Context> context = isolate->GetCurrentContext();
  25   runner_ = gin::PerContextData::From(context)->runner()->GetWeakPtr();
  26   GetWrapper(isolate)->SetHiddenValue(GetHiddenPropertyName(isolate), callback);
  27 }
  28
  29 WaitingCallback::~WaitingCallback() {
  30   DCHECK(!wait_id_) << "Waiting callback was destroyed before being cancelled.";
  31 }
  32
  33 scoped_refptr<WaitingCallback> WaitingCallback::Create(
  34     v8::Isolate* isolate, v8::Handle<v8::Function> callback) {
  35   return make_scoped_refptr(new WaitingCallback(isolate, callback));
  36 }
  37
  38 gin::WrapperInfo WaitingCallback::kWrapperInfo = { gin::kEmbedderNativeGin };
  39
  40 gin::WrapperInfo* WaitingCallback::GetWrapperInfo() {
  41   return &kWrapperInfo;
  42 }
  43
  44 void WaitingCallback::EnsureRegistered(v8::Isolate* isolate) {
  45   gin::PerIsolateData* data = gin::PerIsolateData::From(isolate);
  46   if (!data->GetObjectTemplate(&kWrapperInfo).IsEmpty())
  47     return;
  48   v8::Handle<v8::ObjectTemplate> templ = v8::ObjectTemplate::New();
  49   templ->SetInternalFieldCount(gin::kNumberOfInternalFields);
  50   data->SetObjectTemplate(&kWrapperInfo, templ);
  51 }
  52
  53 void WaitingCallback::OnHandleReady(MojoResult result) {
  54   wait_id_ = NULL;
  55
  56   if (!runner_)
  57     return;
  58
  59   gin::Runner::Scope scope(runner_.get());
  60   v8::Isolate* isolate = runner_->isolate();
  61
  62   v8::Handle<v8::Value> hidden_value =
  63       GetWrapper(isolate)->GetHiddenValue(GetHiddenPropertyName(isolate));
  64   v8::Handle<v8::Function> callback;
  65   CHECK(gin::ConvertFromV8(isolate, hidden_value, &callback));
  66
  67   v8::Handle<v8::Value> args[] = { gin::ConvertToV8(isolate, result) };
  68   runner_->Call(callback, runner_->global(), 1, args);
  69 }
  70
  71 }  // namespace js
  72 }  // namespace mojo