зеркало из https://github.com/mozilla/gecko-dev.git
79 строки
2.6 KiB
C++
79 строки
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_PromiseNativeHandler_h
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#define mozilla_dom_PromiseNativeHandler_h
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#include <functional>
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#include "js/TypeDecls.h"
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#include "js/Value.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/Maybe.h"
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#include "nsISupports.h"
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namespace mozilla::dom {
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/*
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* PromiseNativeHandler allows C++ to react to a Promise being
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* rejected/resolved. A PromiseNativeHandler can be appended to a Promise using
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* Promise::AppendNativeHandler().
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*/
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class PromiseNativeHandler : public nsISupports {
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protected:
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virtual ~PromiseNativeHandler() = default;
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public:
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MOZ_CAN_RUN_SCRIPT
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virtual void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
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ErrorResult& aRv) = 0;
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MOZ_CAN_RUN_SCRIPT
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virtual void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
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ErrorResult& aRv) = 0;
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};
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// This base class exists solely to use NS_IMPL_ISUPPORTS because it doesn't
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// support template classes.
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class MozPromiseRejectOnDestructionBase : public PromiseNativeHandler {
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NS_DECL_ISUPPORTS
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void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
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ErrorResult& aRv) override {}
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void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
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ErrorResult& aRv) override {}
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protected:
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~MozPromiseRejectOnDestructionBase() override = default;
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};
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// Use this when you subscribe to a JS promise to settle a MozPromise that is
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// not guaranteed to be settled by anyone else.
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template <typename T>
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class MozPromiseRejectOnDestruction final
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: public MozPromiseRejectOnDestructionBase {
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public:
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// (Accepting RefPtr<T> instead of T* because compiler fails to implicitly
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// convert it at call sites)
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MozPromiseRejectOnDestruction(const RefPtr<T>& aMozPromise,
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const char* aCallSite)
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: mMozPromise(aMozPromise), mCallSite(aCallSite) {
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MOZ_ASSERT(aMozPromise);
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}
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protected:
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~MozPromiseRejectOnDestruction() override {
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// Rejecting will be no-op if the promise is already settled
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mMozPromise->Reject(NS_BINDING_ABORTED, mCallSite);
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}
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RefPtr<T> mMozPromise;
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const char* mCallSite;
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};
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} // namespace mozilla::dom
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#endif // mozilla_dom_PromiseNativeHandler_h
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