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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_PromiseNativeHandler_h
#define mozilla_dom_PromiseNativeHandler_h
#include <functional>
#include "js/TypeDecls.h"
#include "js/Value.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/Maybe.h"
#include "nsISupports.h"
namespace mozilla::dom {
/*
* PromiseNativeHandler allows C++ to react to a Promise being
* rejected/resolved. A PromiseNativeHandler can be appended to a Promise using
* Promise::AppendNativeHandler().
*/
class PromiseNativeHandler : public nsISupports {
protected:
virtual ~PromiseNativeHandler() = default;
public:
MOZ_CAN_RUN_SCRIPT
virtual void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
ErrorResult& aRv) = 0;
MOZ_CAN_RUN_SCRIPT
virtual void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
ErrorResult& aRv) = 0;
};
// This class is used to set C++ callbacks once a dom Promise a resolved or
// rejected.
class DomPromiseListener final : public PromiseNativeHandler {
NS_DECL_ISUPPORTS
public:
using CallbackTypeResolved =
std::function<void(JSContext*, JS::Handle<JS::Value>)>;
using CallbackTypeRejected = std::function<void(nsresult)>;
DomPromiseListener(CallbackTypeResolved&& aResolve,
CallbackTypeRejected&& aReject);
void Clear();
void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
ErrorResult& aRv) override;
void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
ErrorResult& aRv) override;
private:
~DomPromiseListener();
CallbackTypeResolved mResolve;
CallbackTypeRejected mReject;
};
} // namespace mozilla::dom
#endif // mozilla_dom_PromiseNativeHandler_h
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