зеркало из https://github.com/mozilla/gecko-dev.git
135 строки
4.1 KiB
C++
135 строки
4.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_JSWindowActor_h
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#define mozilla_dom_JSWindowActor_h
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#include "js/TypeDecls.h"
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#include "ipc/IPCMessageUtils.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/dom/PromiseNativeHandler.h"
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#include "nsRefPtrHashtable.h"
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class nsIGlobalObject;
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namespace mozilla {
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namespace dom {
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enum class JSWindowActorMessageKind {
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Message,
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Query,
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QueryResolve,
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QueryReject,
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EndGuard_,
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};
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class JSWindowActorMessageMeta;
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class QueryPromiseHandler;
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// Common base class for JSWindowActor{Parent,Child}.
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class JSWindowActor : public nsISupports, public nsWrapperCache {
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(JSWindowActor)
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JSWindowActor();
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enum class Type { Parent, Child };
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enum class CallbackFunction { WillDestroy, DidDestroy, ActorCreated };
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const nsString& Name() const { return mName; }
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void SendAsyncMessage(JSContext* aCx, const nsAString& aMessageName,
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JS::Handle<JS::Value> aObj, ErrorResult& aRv);
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already_AddRefed<Promise> SendQuery(JSContext* aCx,
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const nsAString& aMessageName,
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JS::Handle<JS::Value> aObj,
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ErrorResult& aRv);
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void ReceiveRawMessage(const JSWindowActorMessageMeta& aMetadata,
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ipc::StructuredCloneData&& aData);
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virtual nsIGlobalObject* GetParentObject() const = 0;
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void RejectPendingQueries();
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protected:
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// Send the message described by the structured clone data |aData|, and the
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// message metadata |aMetadata|. The underlying transport should call the
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// |ReceiveMessage| method on the other side asynchronously.
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virtual void SendRawMessage(const JSWindowActorMessageMeta& aMetadata,
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ipc::StructuredCloneData&& aData,
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ErrorResult& aRv) = 0;
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virtual ~JSWindowActor() = default;
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void SetName(const nsAString& aName);
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void StartDestroy();
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void AfterDestroy();
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void InvokeCallback(CallbackFunction willDestroy);
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private:
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void ReceiveMessageOrQuery(JSContext* aCx,
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const JSWindowActorMessageMeta& aMetadata,
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JS::Handle<JS::Value> aData, ErrorResult& aRv);
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void ReceiveQueryReply(JSContext* aCx,
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const JSWindowActorMessageMeta& aMetadata,
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JS::Handle<JS::Value> aData, ErrorResult& aRv);
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// Helper object used while processing query messages to send the final reply
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// message.
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class QueryHandler final : public PromiseNativeHandler {
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(QueryHandler)
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QueryHandler(JSWindowActor* aActor,
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const JSWindowActorMessageMeta& aMetadata);
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void RejectedCallback(JSContext* aCx,
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JS::Handle<JS::Value> aValue) override;
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void ResolvedCallback(JSContext* aCx,
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JS::Handle<JS::Value> aValue) override;
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private:
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~QueryHandler() = default;
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void SendReply(JSContext* aCx, JSWindowActorMessageKind aKind,
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ipc::StructuredCloneData&& aData);
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RefPtr<JSWindowActor> mActor;
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nsString mMessageName;
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uint64_t mQueryId;
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};
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nsString mName;
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nsRefPtrHashtable<nsUint64HashKey, Promise> mPendingQueries;
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uint64_t mNextQueryId;
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};
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} // namespace dom
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} // namespace mozilla
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namespace IPC {
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template <>
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struct ParamTraits<mozilla::dom::JSWindowActorMessageKind>
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: public ContiguousEnumSerializer<
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mozilla::dom::JSWindowActorMessageKind,
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mozilla::dom::JSWindowActorMessageKind::Message,
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mozilla::dom::JSWindowActorMessageKind::EndGuard_> {};
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} // namespace IPC
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#endif // !defined(mozilla_dom_JSWindowActor_h)
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