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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 DOM_FS_SHARED_FILESYSTEMHELPERS_H_
#define DOM_FS_SHARED_FILESYSTEMHELPERS_H_
#include "FileSystemTypes.h"
#include "mozilla/RefPtr.h"
namespace mozilla::dom::fs {
// XXX Consider moving this class template to MFBT.
// A wrapper class template on top of the RefPtr. The RefPtr provides us the
// automatic reference counting of objects with AddRef() and Release() methods.
// `Registered` provides automatic registration counting of objects with
// Register() and Unregister() methods. Registration counting works similarly
// as reference counting, but objects are not deleted when the number of
// registrations drops to zero (that's managed by reference counting). Instead,
// an object can trigger an asynchronous close operation which still needs to
// hold and use the referenced object. Example:
//
// using BoolPromise = MozPromise<bool, nsresult, false>;
//
// class MyObject {
// public:
// NS_INLINE_DECL_REFCOUNTING(MyObject)
//
// void Register() {
// mRegCnt++;
// }
//
// void Unregister() {
// mRegCnt--;
// if (mRegCnt == 0) {
// BeginClose();
// }
// }
//
// private:
// RefPtr<BoolPromise> BeginClose() {
// return InvokeAsync(mIOTaskQueue, __func__,
// []() {
// return BoolPromise::CreateAndResolve(true, __func__);
// })
// ->Then(GetCurrentSerialEventTarget(), __func__,
// [self = RefPtr<MyObject>(this)](
// const BoolPromise::ResolveOrRejectValue&) {
// return self->mIOTaskQueue->BeginShutdown();
// })
// ->Then(GetCurrentSerialEventTarget(), __func__,
// [self = RefPtr<MyObject>(this)](
// const ShutdownPromise::ResolveOrRejectValue&) {
// return BoolPromise::CreateAndResolve(true, __func__);
// });
// }
//
// RefPtr<TaskQueue> mIOTaskQueue;
// uint32_t mRegCnt = 0;
// };
template <class T>
class Registered {
private:
RefPtr<T> mObject;
public:
~Registered() {
if (mObject) {
mObject->Unregister();
}
}
Registered() = default;
Registered(const Registered& aOther) : mObject(aOther.mObject) {
mObject->Register();
}
Registered(Registered&& aOther) noexcept = default;
MOZ_IMPLICIT Registered(RefPtr<T> aObject) : mObject(std::move(aObject)) {
if (mObject) {
mObject->Register();
}
}
Registered<T>& operator=(decltype(nullptr)) {
RefPtr<T> oldObject = std::move(mObject);
mObject = nullptr;
if (oldObject) {
oldObject->Unregister();
}
return *this;
}
Registered<T>& operator=(const Registered<T>& aRhs) {
if (aRhs.mObject) {
aRhs.mObject->Register();
}
RefPtr<T> oldObject = std::move(mObject);
mObject = aRhs.mObject;
if (oldObject) {
oldObject->Unregister();
}
return *this;
}
Registered<T>& operator=(Registered<T>&& aRhs) noexcept {
RefPtr<T> oldObject = std::move(mObject);
mObject = std::move(aRhs.mObject);
aRhs.mObject = nullptr;
if (oldObject) {
oldObject->Unregister();
}
return *this;
}
const RefPtr<T>& inspect() const { return mObject; }
RefPtr<T> unwrap() {
RefPtr<T> oldObject = std::move(mObject);
mObject = nullptr;
if (oldObject) {
oldObject->Unregister();
}
return oldObject;
}
T* get() const { return mObject; }
operator T*() const& { return get(); }
T* operator->() const { return get(); }
};
// Spec says valid names don't include (os-dependent) path separators,
// and is not equal to a dot . or two dots ..
// We want to use the same validator from both child and parent.
bool IsValidName(const fs::Name& aName);
} // namespace mozilla::dom::fs
#endif // DOM_FS_SHARED_FILESYSTEMHELPERS_H_
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