| // 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. |
| |
| #include "mojo/edk/js/waiting_callback.h" |
| |
| #include "base/bind.h" |
| #include "base/message_loop/message_loop.h" |
| #include "gin/per_context_data.h" |
| #include "mojo/public/cpp/environment/environment.h" |
| |
| namespace mojo { |
| namespace js { |
| |
| namespace { |
| |
| v8::Handle<v8::String> GetHiddenPropertyName(v8::Isolate* isolate) { |
| return gin::StringToSymbol(isolate, "::mojo::js::WaitingCallback"); |
| } |
| |
| } // namespace |
| |
| gin::WrapperInfo WaitingCallback::kWrapperInfo = { gin::kEmbedderNativeGin }; |
| |
| // static |
| gin::Handle<WaitingCallback> WaitingCallback::Create( |
| v8::Isolate* isolate, |
| v8::Handle<v8::Function> callback, |
| gin::Handle<HandleWrapper> handle_wrapper, |
| MojoHandleSignals signals) { |
| gin::Handle<WaitingCallback> waiting_callback = gin::CreateHandle( |
| isolate, new WaitingCallback(isolate, callback, handle_wrapper)); |
| waiting_callback->wait_id_ = Environment::GetDefaultAsyncWaiter()->AsyncWait( |
| handle_wrapper->get().value(), |
| signals, |
| MOJO_DEADLINE_INDEFINITE, |
| &WaitingCallback::CallOnHandleReady, |
| waiting_callback.get()); |
| return waiting_callback; |
| } |
| |
| void WaitingCallback::Cancel() { |
| if (!wait_id_) |
| return; |
| |
| handle_wrapper_->RemoveCloseObserver(this); |
| handle_wrapper_ = NULL; |
| Environment::GetDefaultAsyncWaiter()->CancelWait(wait_id_); |
| wait_id_ = 0; |
| } |
| |
| WaitingCallback::WaitingCallback(v8::Isolate* isolate, |
| v8::Handle<v8::Function> callback, |
| gin::Handle<HandleWrapper> handle_wrapper) |
| : wait_id_(0), handle_wrapper_(handle_wrapper.get()), weak_factory_(this) { |
| handle_wrapper_->AddCloseObserver(this); |
| v8::Handle<v8::Context> context = isolate->GetCurrentContext(); |
| runner_ = gin::PerContextData::From(context)->runner()->GetWeakPtr(); |
| GetWrapper(isolate)->SetHiddenValue(GetHiddenPropertyName(isolate), callback); |
| } |
| |
| WaitingCallback::~WaitingCallback() { |
| Cancel(); |
| } |
| |
| // static |
| void WaitingCallback::CallOnHandleReady(void* closure, MojoResult result) { |
| static_cast<WaitingCallback*>(closure)->OnHandleReady(result); |
| } |
| |
| void WaitingCallback::ClearWaitId() { |
| wait_id_ = 0; |
| handle_wrapper_->RemoveCloseObserver(this); |
| handle_wrapper_ = nullptr; |
| } |
| |
| void WaitingCallback::OnHandleReady(MojoResult result) { |
| ClearWaitId(); |
| CallCallback(result); |
| } |
| |
| void WaitingCallback::CallCallback(MojoResult result) { |
| // ClearWaitId must already have been called. |
| DCHECK(!wait_id_); |
| DCHECK(!handle_wrapper_); |
| |
| if (!runner_) |
| return; |
| |
| gin::Runner::Scope scope(runner_.get()); |
| v8::Isolate* isolate = runner_->GetContextHolder()->isolate(); |
| |
| v8::Handle<v8::Value> hidden_value = |
| GetWrapper(isolate)->GetHiddenValue(GetHiddenPropertyName(isolate)); |
| v8::Handle<v8::Function> callback; |
| CHECK(gin::ConvertFromV8(isolate, hidden_value, &callback)); |
| |
| v8::Handle<v8::Value> args[] = { gin::ConvertToV8(isolate, result) }; |
| runner_->Call(callback, runner_->global(), 1, args); |
| } |
| |
| void WaitingCallback::OnWillCloseHandle() { |
| Environment::GetDefaultAsyncWaiter()->CancelWait(wait_id_); |
| |
| // This may be called from GC, so we can't execute Javascript now, call |
| // ClearWaitId explicitly, and CallCallback asynchronously. |
| ClearWaitId(); |
| base::MessageLoop::current()->PostTask( |
| FROM_HERE, |
| base::Bind(&WaitingCallback::CallCallback, weak_factory_.GetWeakPtr(), |
| MOJO_RESULT_INVALID_ARGUMENT)); |
| } |
| |
| } // namespace js |
| } // namespace mojo |