text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  #include "handle_wrap.h"
  #include "async_wrap-inl.h"
  #include "env-inl.h"
  #include "node_external_reference.h"
  #include "util-inl.h"
  
  namespace node {
  
  using v8::Context;
  using v8::FunctionCallbackInfo;
  using v8::FunctionTemplate;
  using v8::HandleScope;
  using v8::Local;
  using v8::Object;
  using v8::Value;
  
  
  void HandleWrap::Ref(const FunctionCallbackInfo<Value>& args) {
    HandleWrap* wrap;
    ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
  
    if (IsAlive(wrap))
      uv_ref(wrap->GetHandle());
  }
  
  
  void HandleWrap::Unref(const FunctionCallbackInfo<Value>& args) {
    HandleWrap* wrap;
    ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
  
    if (IsAlive(wrap))
      uv_unref(wrap->GetHandle());
  }
  
  
  void HandleWrap::HasRef(const FunctionCallbackInfo<Value>& args) {
    HandleWrap* wrap;
    ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
    args.GetReturnValue().Set(HasRef(wrap));
  }
  
  
  void HandleWrap::Close(const FunctionCallbackInfo<Value>& args) {
    HandleWrap* wrap;
    ASSIGN_OR_RETURN_UNWRAP(&wrap, args.Holder());
  
    wrap->Close(args[0]);
  }
  
  void HandleWrap::Close(Local<Value> close_callback) {
    if (state_ != kInitialized)
      return;
  
    uv_close(handle_, OnClose);
    state_ = kClosing;
  
    if (!close_callback.IsEmpty() && close_callback->IsFunction() &&
        !persistent().IsEmpty()) {
      object()->Set(env()->context(),
                    env()->handle_onclose_symbol(),
                    close_callback).Check();
    }
  }
  
  
  void HandleWrap::OnGCCollect() {
    Close();
  }
  
  
  bool HandleWrap::IsNotIndicativeOfMemoryLeakAtExit() const {
    return IsWeakOrDetached() ||
           !HandleWrap::HasRef(this) ||
           !uv_is_active(GetHandle());
  }
  
  
  void HandleWrap::MarkAsInitialized() {
    env()->handle_wrap_queue()->PushBack(this);
    state_ = kInitialized;
  }
  
  
  void HandleWrap::MarkAsUninitialized() {
    handle_wrap_queue_.Remove();
    state_ = kClosed;
  }
  
  
  HandleWrap::HandleWrap(Environment* env,
                         Local<Object> object,
                         uv_handle_t* handle,
                         AsyncWrap::ProviderType provider)
      : AsyncWrap(env, object, provider),
        state_(kInitialized),
        handle_(handle) {
    handle_->data = this;
    HandleScope scope(env->isolate());
    CHECK(env->has_run_bootstrapping_code());
    env->handle_wrap_queue()->PushBack(this);
  }
  
  
  void HandleWrap::OnClose(uv_handle_t* handle) {
    CHECK_NOT_NULL(handle->data);
    BaseObjectPtr<HandleWrap> wrap { static_cast<HandleWrap*>(handle->data) };
    wrap->Detach();
  
    Environment* env = wrap->env();
    HandleScope scope(env->isolate());
    Context::Scope context_scope(env->context());
  
    CHECK_EQ(wrap->state_, kClosing);
  
    wrap->state_ = kClosed;
  
    wrap->OnClose();
    wrap->handle_wrap_queue_.Remove();
  
    if (!wrap->persistent().IsEmpty() &&
        wrap->object()->Has(env->context(), env->handle_onclose_symbol())
        .FromMaybe(false)) {
      wrap->MakeCallback(env->handle_onclose_symbol(), 0, nullptr);
    }
  }
  
  Local<FunctionTemplate> HandleWrap::GetConstructorTemplate(Environment* env) {
    Local<FunctionTemplate> tmpl = env->handle_wrap_ctor_template();
    if (tmpl.IsEmpty()) {
      tmpl = env->NewFunctionTemplate(nullptr);
      tmpl->SetClassName(FIXED_ONE_BYTE_STRING(env->isolate(), "HandleWrap"));
      tmpl->Inherit(AsyncWrap::GetConstructorTemplate(env));
      env->SetProtoMethod(tmpl, "close", HandleWrap::Close);
      env->SetProtoMethodNoSideEffect(tmpl, "hasRef", HandleWrap::HasRef);
      env->SetProtoMethod(tmpl, "ref", HandleWrap::Ref);
      env->SetProtoMethod(tmpl, "unref", HandleWrap::Unref);
      env->set_handle_wrap_ctor_template(tmpl);
    }
    return tmpl;
  }
  
  void HandleWrap::RegisterExternalReferences(
      ExternalReferenceRegistry* registry) {
    registry->Register(HandleWrap::Close);
    registry->Register(HandleWrap::HasRef);
    registry->Register(HandleWrap::Ref);
    registry->Register(HandleWrap::Unref);
  }
  
  }  // namespace node
  
  NODE_MODULE_EXTERNAL_REFERENCE(handle_wrap,
                                 node::HandleWrap::RegisterExternalReferences)
  