text: #include "async-wrap.h"
  #include "async-wrap-inl.h"
  #include "env.h"
  #include "env-inl.h"
  #include "handle_wrap.h"
  #include "util.h"
  #include "util-inl.h"
  
  #include <stdint.h>
  
  namespace node {
  
  using v8::Context;
  using v8::Function;
  using v8::FunctionCallbackInfo;
  using v8::FunctionTemplate;
  using v8::Handle;
  using v8::HandleScope;
  using v8::Integer;
  using v8::Local;
  using v8::Object;
  using v8::Value;
  
  const uint32_t kOnTimeout = 0;
  
  class TimerWrap : public HandleWrap {
   public:
    static void Initialize(Handle<Object> target,
                           Handle<Value> unused,
                           Handle<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);
      env->SetProtoMethod(constructor, "setRepeat", SetRepeat);
      env->SetProtoMethod(constructor, "getRepeat", GetRepeat);
      env->SetProtoMethod(constructor, "again", Again);
  
      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, Handle<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 Again(const FunctionCallbackInfo<Value>& args) {
      TimerWrap* wrap = Unwrap<TimerWrap>(args.Holder());
  
      CHECK(HandleWrap::IsAlive(wrap));
  
      int err = uv_timer_again(&wrap->handle_);
      args.GetReturnValue().Set(err);
    }
  
    static void SetRepeat(const FunctionCallbackInfo<Value>& args) {
      TimerWrap* wrap = Unwrap<TimerWrap>(args.Holder());
  
      CHECK(HandleWrap::IsAlive(wrap));
  
      int64_t repeat = args[0]->IntegerValue();
      uv_timer_set_repeat(&wrap->handle_, repeat);
      args.GetReturnValue().Set(0);
    }
  
    static void GetRepeat(const FunctionCallbackInfo<Value>& args) {
      TimerWrap* wrap = Unwrap<TimerWrap>(args.Holder());
  
      CHECK(HandleWrap::IsAlive(wrap));
  
      int64_t repeat = uv_timer_get_repeat(&wrap->handle_);
      if (repeat <= 0xfffffff)
        args.GetReturnValue().Set(static_cast<uint32_t>(repeat));
      else
        args.GetReturnValue().Set(static_cast<double>(repeat));
    }
  
    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());
      if (now <= 0xfffffff)
        args.GetReturnValue().Set(static_cast<uint32_t>(now));
      else
        args.GetReturnValue().Set(static_cast<double>(now));
    }
  
    uv_timer_t handle_;
  };
  
  
  }  // namespace node
  
  NODE_MODULE_CONTEXT_AWARE_BUILTIN(timer_wrap, node::TimerWrap::Initialize)
  