public:

static void Initialize(Local<Object> target,

Local<Value> unused,

Local<Context> context) {

Environment* env = Environment::GetCurrent(context);

Local<FunctionTemplate> constructor = env->NewFunctionTemplate(New);

constructor->InstanceTemplate()->SetInternalFieldCount(1);

constructor->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "Timer"));

constructor->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "kOnTimeout"),

Integer::New(env->isolate(), kOnTimeout));

env->SetTemplateMethod(constructor, "now", Now);

env->SetProtoMethod(constructor, "close", HandleWrap::Close);

env->SetProtoMethod(constructor, "ref", HandleWrap::Ref);

env->SetProtoMethod(constructor, "unref", HandleWrap::Unref);

env->SetProtoMethod(constructor, "start", Start);

env->SetProtoMethod(constructor, "stop", Stop);

target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "Timer"),

constructor->GetFunction());

}

size_t self_size() const override { return sizeof(*this); }

private:

static void New(const FunctionCallbackInfo<Value>& args) {

// This constructor should not be exposed to public javascript.

// Therefore we assert that we are not trying to call this as a

// normal function.

CHECK(args.IsConstructCall());

Environment* env = Environment::GetCurrent(args);

new TimerWrap(env, args.This());

}

TimerWrap(Environment* env, Local<Object> object)

: HandleWrap(env,

object,

reinterpret_cast<uv_handle_t*>(&handle_),

AsyncWrap::PROVIDER_TIMERWRAP) {

int r = uv_timer_init(env->event_loop(), &handle_);

CHECK_EQ(r, 0);

}

static void Start(const FunctionCallbackInfo<Value>& args) {

TimerWrap* wrap = Unwrap<TimerWrap>(args.Holder());

CHECK(HandleWrap::IsAlive(wrap));

int64_t timeout = args[0]->IntegerValue();

int64_t repeat = args[1]->IntegerValue();

int err = uv_timer_start(&wrap->handle_, OnTimeout, timeout, repeat);

args.GetReturnValue().Set(err);

}

static void Stop(const FunctionCallbackInfo<Value>& args) {

TimerWrap* wrap = Unwrap<TimerWrap>(args.Holder());

CHECK(HandleWrap::IsAlive(wrap));

int err = uv_timer_stop(&wrap->handle_);

args.GetReturnValue().Set(err);

}

static void OnTimeout(uv_timer_t* handle) {

TimerWrap* wrap = static_cast<TimerWrap*>(handle->data);

Environment* env = wrap->env();

HandleScope handle_scope(env->isolate());

Context::Scope context_scope(env->context());

wrap->MakeCallback(kOnTimeout, 0, nullptr);

}

static void Now(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

uv_update_time(env->event_loop());

uint64_t now = uv_now(env->event_loop());

CHECK(now >= env->timer_base());

now -= env->timer_base();

if (now <= 0xfffffff)

args.GetReturnValue().Set(static_cast<uint32_t>(now));

else

args.GetReturnValue().Set(static_cast<double>(now));

}

uv_timer_t handle_;