SharedMessageBody.h

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/* 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/. */

#ifndef mozilla_dom_SharedMessageBody_h

#define mozilla_dom_SharedMessageBody_h

#include "mozilla/Maybe.h"

#include "mozilla/dom/ipc/StructuredCloneData.h"

namespace mozilla {

namespace ipc {

class PBackgroundChild;

namespace dom {

class MessagePort;

class RefMessageBody;

class RefMessageBodyService;

class SharedMessageBody final {

 public:

  NS_INLINE_DECL_REFCOUNTING(SharedMessageBody)

  SharedMessageBody(

      StructuredCloneHolder::TransferringSupport aSupportsTransferring,

      const Maybe<nsID>& aAgentClusterId);

  enum ReadMethod {

    StealRefMessageBody,

    KeepRefMessageBody,

};

  void Read(JSContext* aCx, JS::MutableHandle<JS::Value> aValue,

            RefMessageBodyService* aRefMessageBodyService,

            ReadMethod aReadMethod, ErrorResult& aRv);

  void Write(JSContext* aCx, JS::Handle<JS::Value> aValue,

             JS::Handle<JS::Value> aTransfers, nsID& aPortID,

             RefMessageBodyService* aRefMessageBodyService, ErrorResult& aRv);

  bool TakeTransferredPortsAsSequence(

      Sequence<OwningNonNull<mozilla::dom::MessagePort>>& aPorts);

  const Maybe<nsID>& GetRefDataId() const { return mRefDataId; }

 private:

  friend struct IPC::ParamTraits<mozilla::dom::SharedMessageBody*>;

  ~SharedMessageBody();

  RefPtr<ipc::StructuredCloneData> mCloneData;

  RefPtr<RefMessageBody> mRefData;

  Maybe<nsID> mRefDataId;

  const StructuredCloneHolder::TransferringSupport mSupportsTransferring;

  const Maybe<nsID> mAgentClusterId;

};

}  // namespace dom

}  // namespace mozilla

namespace IPC {

template <>

struct ParamTraits<mozilla::dom::SharedMessageBody*> {

  using paramType = mozilla::dom::SharedMessageBody;

  static void Write(MessageWriter* aWriter, paramType* aParam);

  static bool Read(MessageReader* aReader, RefPtr<paramType>* aResult);

};

}  // namespace IPC

#endif  // mozilla_dom_SharedMessageBody_h