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// 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"
namespace mojo {
namespace edk {
namespace js {
namespace {
v8::Handle<v8::Private> GetHiddenPropertyName(v8::Isolate* isolate) {
return v8::Private::ForApi(
isolate, gin::StringToV8(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,
bool one_shot) {
gin::Handle<WaitingCallback> waiting_callback = gin::CreateHandle(
isolate, new WaitingCallback(isolate, callback, one_shot));
MojoResult result = waiting_callback->watcher_.Start(
handle_wrapper->get(), signals,
base::Bind(&WaitingCallback::OnHandleReady,
base::Unretained(waiting_callback.get())));
// The signals may already be unsatisfiable.
if (result == MOJO_RESULT_FAILED_PRECONDITION)
waiting_callback->OnHandleReady(MOJO_RESULT_FAILED_PRECONDITION);
return waiting_callback;
}
void WaitingCallback::Cancel() {
if (watcher_.IsWatching())
watcher_.Cancel();
}
WaitingCallback::WaitingCallback(v8::Isolate* isolate,
v8::Handle<v8::Function> callback,
bool one_shot)
: one_shot_(one_shot),
weak_factory_(this) {
v8::Handle<v8::Context> context = isolate->GetCurrentContext();
runner_ = gin::PerContextData::From(context)->runner()->GetWeakPtr();
GetWrapper(isolate)
->SetPrivate(context, GetHiddenPropertyName(isolate), callback)
.FromJust();
}
WaitingCallback::~WaitingCallback() {
Cancel();
}
void WaitingCallback::OnHandleReady(MojoResult result) {
if (!runner_)
return;
gin::Runner::Scope scope(runner_.get());
v8::Isolate* isolate = runner_->GetContextHolder()->isolate();
v8::Handle<v8::Value> hidden_value =
GetWrapper(isolate)
->GetPrivate(runner_->GetContextHolder()->context(),
GetHiddenPropertyName(isolate))
.ToLocalChecked();
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);
if (one_shot_ || result == MOJO_RESULT_CANCELLED) {
runner_.reset();
Cancel();
}
}
} // namespace js
} // namespace edk
} // namespace mojo
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