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+/* -*- 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/. */
+
+#ifndef mozilla_dom_fetcheventopparent_h__
+#define mozilla_dom_fetcheventopparent_h__
+
+#include "nsISupports.h"
+
+#include "mozilla/dom/FetchEventOpProxyParent.h"
+#include "mozilla/dom/PFetchEventOpParent.h"
+
+namespace mozilla::dom {
+
+class FetchEventOpParent final : public PFetchEventOpParent {
+ friend class PFetchEventOpParent;
+
+ public:
+ NS_INLINE_DECL_REFCOUNTING(FetchEventOpParent)
+
+ FetchEventOpParent() = default;
+
+ // Transition from the Pending state to the Started state. Returns the preload
+ // response and response end args, if it has already arrived.
+ std::tuple<Maybe<ParentToParentInternalResponse>, Maybe<ResponseEndArgs>>
+ OnStart(
+ MovingNotNull<RefPtr<FetchEventOpProxyParent>> aFetchEventOpProxyParent);
+
+ // Transition from the Started state to the Finished state.
+ void OnFinish();
+
+ private:
+ ~FetchEventOpParent() = default;
+
+ // IPDL methods
+
+ mozilla::ipc::IPCResult RecvPreloadResponse(
+ ParentToParentInternalResponse&& aResponse);
+
+ mozilla::ipc::IPCResult RecvPreloadResponseTiming(ResponseTiming&& aTiming);
+
+ mozilla::ipc::IPCResult RecvPreloadResponseEnd(ResponseEndArgs&& aArgs);
+
+ void ActorDestroy(ActorDestroyReason) override;
+
+ struct Pending {
+ Maybe<ParentToParentInternalResponse> mPreloadResponse;
+ Maybe<ResponseTiming> mTiming;
+ Maybe<ResponseEndArgs> mEndArgs;
+ };
+
+ struct Started {
+ NotNull<RefPtr<FetchEventOpProxyParent>> mFetchEventOpProxyParent;
+ };
+
+ struct Finished {};
+
+ using State = Variant<Pending, Started, Finished>;
+
+ // Tracks the state of the fetch event.
+ //
+ // Pending: the fetch event is waiting in RemoteWorkerController::mPendingOps
+ // and if the preload response arrives, we have to save it.
+ // Started: the FetchEventOpProxyParent has been created, and if the preload
+ // response arrives then we should forward it.
+ // Finished: the response has been propagated to the parent process, if the
+ // preload response arrives now then we simply drop it.
+ State mState = AsVariant(Pending());
+};
+
+} // namespace mozilla::dom
+
+#endif // mozilla_dom_fetcheventopparent_h__