/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "Worker.h"

#include "MessageEventRunnable.h"

#include "mozilla/dom/WorkerBinding.h"

#include "mozilla/TimelineConsumers.h"

#include "mozilla/WorkerTimelineMarker.h"

#include "nsContentUtils.h"

#include "WorkerPrivate.h"

namespace mozilla {

namespace dom {

/* static */ already_AddRefed<Worker>

Worker::Constructor(const GlobalObject& aGlobal, const nsAString& aScriptURL,

                    const WorkerOptions& aOptions, ErrorResult& aRv)

{

  JSContext* cx = aGlobal.Context();

  RefPtr<WorkerPrivate> workerPrivate =

    WorkerPrivate::Constructor(cx, aScriptURL, false /* aIsChromeWorker */,

                               WorkerTypeDedicated, aOptions.mName,

                               VoidCString(), nullptr /*aLoadInfo */, aRv);

  if (NS_WARN_IF(aRv.Failed())) {

    return nullptr;

  }

  nsCOMPtr<nsIGlobalObject> globalObject =

    do_QueryInterface(aGlobal.GetAsSupports());

  RefPtr<Worker> worker = new Worker(globalObject, workerPrivate.forget());

  return worker.forget();

}

Worker::Worker(nsIGlobalObject* aGlobalObject,

               already_AddRefed<WorkerPrivate> aWorkerPrivate)

  : DOMEventTargetHelper(aGlobalObject)

  , mWorkerPrivate(std::move(aWorkerPrivate))

{

  MOZ_ASSERT(mWorkerPrivate);

  mWorkerPrivate->SetParentEventTargetRef(this);

}

Worker::~Worker()

{

  Terminate();

}

JSObject*

Worker::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)

{

  JS::Rooted<JSObject*> wrapper(aCx,

    Worker_Binding::Wrap(aCx, this, aGivenProto));

  if (wrapper) {

    // Most DOM objects don't assume they have a reflector. If they don't have

    // one and need one, they create it. But in workers code, we assume that the

    // reflector is always present.  In order to guarantee that it's always

    // present, we have to preserve it. Otherwise the GC will happily collect it

    // as needed.

    MOZ_ALWAYS_TRUE(TryPreserveWrapper(wrapper));

  }

  return wrapper;

}

void

Worker::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,

                    const Sequence<JSObject*>& aTransferable,

                    ErrorResult& aRv)

{

  NS_ASSERT_OWNINGTHREAD(Worker);

  if (!mWorkerPrivate ||

      mWorkerPrivate->ParentStatusProtected() > Running) {

    return;

  }

  JS::Rooted<JS::Value> transferable(aCx, JS::UndefinedValue());

  aRv = nsContentUtils::CreateJSValueFromSequenceOfObject(aCx, aTransferable,

                                                          &transferable);

  if (NS_WARN_IF(aRv.Failed())) {

    return;

  }

  RefPtr<MessageEventRunnable> runnable =

    new MessageEventRunnable(mWorkerPrivate,

                             WorkerRunnable::WorkerThreadModifyBusyCount);

  UniquePtr<AbstractTimelineMarker> start;

  UniquePtr<AbstractTimelineMarker> end;

  RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();

  bool isTimelineRecording = timelines && !timelines->IsEmpty();

  if (isTimelineRecording) {

    start = MakeUnique<WorkerTimelineMarker>(NS_IsMainThread()

      ? ProfileTimelineWorkerOperationType::SerializeDataOnMainThread

      : ProfileTimelineWorkerOperationType::SerializeDataOffMainThread,

      MarkerTracingType::START);

  }

  runnable->Write(aCx, aMessage, transferable, JS::CloneDataPolicy(), aRv);

  if (isTimelineRecording) {

    end = MakeUnique<WorkerTimelineMarker>(NS_IsMainThread()

      ? ProfileTimelineWorkerOperationType::SerializeDataOnMainThread

      : ProfileTimelineWorkerOperationType::SerializeDataOffMainThread,

      MarkerTracingType::END);

    timelines->AddMarkerForAllObservedDocShells(start);

    timelines->AddMarkerForAllObservedDocShells(end);

  }

  if (NS_WARN_IF(aRv.Failed())) {

    return;

  }

  if (!runnable->Dispatch()) {

    aRv.Throw(NS_ERROR_FAILURE);

  }

}

void

Worker::Terminate()

{

  NS_ASSERT_OWNINGTHREAD(Worker);

  if (mWorkerPrivate) {

    mWorkerPrivate->Cancel();

    mWorkerPrivate = nullptr;

  }

}

NS_IMPL_CYCLE_COLLECTION_CLASS(Worker)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(Worker, DOMEventTargetHelper)

  if (tmp->mWorkerPrivate) {

    tmp->mWorkerPrivate->Traverse(cb);

  }

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(Worker, DOMEventTargetHelper)

  tmp->Terminate();

NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(Worker, DOMEventTargetHelper)

NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Worker)

NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)

NS_IMPL_ADDREF_INHERITED(Worker, DOMEventTargetHelper)

NS_IMPL_RELEASE_INHERITED(Worker, DOMEventTargetHelper)

} // dom namespace

} // mozilla namespace