1 // Copyright 2014 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/bindings/js/waiting_callback.h"
6
7 #include "gin/per_context_data.h"
8 #include "mojo/public/cpp/environment/environment.h"
9
10 namespace mojo {
11 namespace js {
12
13 namespace {
14
GetHiddenPropertyName(v8::Isolate * isolate)15 v8::Handle<v8::String> GetHiddenPropertyName(v8::Isolate* isolate) {
16 return gin::StringToSymbol(isolate, "::mojo::js::WaitingCallback");
17 }
18
19 } // namespace
20
21 gin::WrapperInfo WaitingCallback::kWrapperInfo = { gin::kEmbedderNativeGin };
22
23 // static
Create(v8::Isolate * isolate,v8::Handle<v8::Function> callback,gin::Handle<gin::HandleWrapper> handle_wrapper,MojoHandleSignals signals)24 gin::Handle<WaitingCallback> WaitingCallback::Create(
25 v8::Isolate* isolate,
26 v8::Handle<v8::Function> callback,
27 gin::Handle<gin::HandleWrapper> handle_wrapper,
28 MojoHandleSignals signals) {
29 gin::Handle<WaitingCallback> waiting_callback = gin::CreateHandle(
30 isolate, new WaitingCallback(isolate, callback, handle_wrapper));
31 waiting_callback->wait_id_ = Environment::GetDefaultAsyncWaiter()->AsyncWait(
32 handle_wrapper->get().value(),
33 signals,
34 MOJO_DEADLINE_INDEFINITE,
35 &WaitingCallback::CallOnHandleReady,
36 waiting_callback.get());
37 return waiting_callback;
38 }
39
Cancel()40 void WaitingCallback::Cancel() {
41 if (!wait_id_)
42 return;
43
44 handle_wrapper_->RemoveCloseObserver(this);
45 handle_wrapper_ = NULL;
46 Environment::GetDefaultAsyncWaiter()->CancelWait(wait_id_);
47 wait_id_ = 0;
48 }
49
WaitingCallback(v8::Isolate * isolate,v8::Handle<v8::Function> callback,gin::Handle<gin::HandleWrapper> handle_wrapper)50 WaitingCallback::WaitingCallback(v8::Isolate* isolate,
51 v8::Handle<v8::Function> callback,
52 gin::Handle<gin::HandleWrapper> handle_wrapper)
53 : wait_id_(0), handle_wrapper_(handle_wrapper.get()) {
54 handle_wrapper_->AddCloseObserver(this);
55 v8::Handle<v8::Context> context = isolate->GetCurrentContext();
56 runner_ = gin::PerContextData::From(context)->runner()->GetWeakPtr();
57 GetWrapper(isolate)->SetHiddenValue(GetHiddenPropertyName(isolate), callback);
58 }
59
~WaitingCallback()60 WaitingCallback::~WaitingCallback() {
61 Cancel();
62 }
63
64 // static
CallOnHandleReady(void * closure,MojoResult result)65 void WaitingCallback::CallOnHandleReady(void* closure, MojoResult result) {
66 static_cast<WaitingCallback*>(closure)->OnHandleReady(result);
67 }
68
OnHandleReady(MojoResult result)69 void WaitingCallback::OnHandleReady(MojoResult result) {
70 wait_id_ = 0;
71 handle_wrapper_->RemoveCloseObserver(this);
72 handle_wrapper_ = NULL;
73
74 if (!runner_)
75 return;
76
77 gin::Runner::Scope scope(runner_.get());
78 v8::Isolate* isolate = runner_->GetContextHolder()->isolate();
79
80 v8::Handle<v8::Value> hidden_value =
81 GetWrapper(isolate)->GetHiddenValue(GetHiddenPropertyName(isolate));
82 v8::Handle<v8::Function> callback;
83 CHECK(gin::ConvertFromV8(isolate, hidden_value, &callback));
84
85 v8::Handle<v8::Value> args[] = { gin::ConvertToV8(isolate, result) };
86 runner_->Call(callback, runner_->global(), 1, args);
87 }
88
OnWillCloseHandle()89 void WaitingCallback::OnWillCloseHandle() {
90 Environment::GetDefaultAsyncWaiter()->CancelWait(wait_id_);
91 OnHandleReady(MOJO_RESULT_INVALID_ARGUMENT);
92 }
93
94 } // namespace js
95 } // namespace mojo
96