forked from mirrors/gecko-dev
ad01a10a3b
Note that this patch only transforms the use of the nsDataHashtable type alias to a directly equivalent use of nsTHashMap. It does not change the specification of the hash key type to make use of the key class deduction that nsTHashMap allows for in some cases. That can be done in a separate step, but requires more attention. Differential Revision: https://phabricator.services.mozilla.com/D106008
135 lines
3.7 KiB
C++
135 lines
3.7 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_indexeddb_filemanagerbase_h__
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#define mozilla_dom_indexeddb_filemanagerbase_h__
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#include "mozilla/Attributes.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/StaticMutex.h"
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#include "nsTHashMap.h"
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#include "nsHashKeys.h"
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#include "nsISupportsImpl.h"
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#include "FileInfoT.h"
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#include "FlippedOnce.h"
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namespace mozilla {
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namespace dom {
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namespace indexedDB {
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template <typename FileManager>
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class FileManagerBase {
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public:
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using FileInfo = FileInfoT<FileManager>;
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using MutexType = StaticMutex;
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using AutoLock = mozilla::detail::BaseAutoLock<MutexType&>;
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[[nodiscard]] SafeRefPtr<FileInfo> GetFileInfo(int64_t aId) const {
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return AcquireFileInfo([this, aId] { return mFileInfos.MaybeGet(aId); });
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}
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[[nodiscard]] SafeRefPtr<FileInfo> CreateFileInfo() {
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return AcquireFileInfo([this] {
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const int64_t id = ++mLastFileId;
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auto fileInfo =
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MakeNotNull<FileInfo*>(FileManagerGuard{},
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SafeRefPtr{static_cast<FileManager*>(this),
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AcquireStrongRefFromRawPtr{}},
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id);
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mFileInfos.InsertOrUpdate(id, fileInfo);
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return Some(fileInfo);
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});
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}
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void RemoveFileInfo(const int64_t aId, const AutoLock& aFileMutexLock) {
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#ifdef DEBUG
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aFileMutexLock.AssertOwns(FileManager::Mutex());
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#endif
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mFileInfos.Remove(aId);
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}
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nsresult Invalidate() {
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AutoLock lock(FileManager::Mutex());
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mInvalidated.Flip();
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mFileInfos.RemoveIf([](const auto& iter) {
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FileInfo* info = iter.Data();
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MOZ_ASSERT(info);
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return !info->LockedClearDBRefs(FileManagerGuard{});
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});
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return NS_OK;
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}
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bool Invalidated() const { return mInvalidated; }
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class FileManagerGuard {
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FileManagerGuard() = default;
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};
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private:
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// Runs the given aFileInfoTableOp operation, which must return a FileInfo*,
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// under the file manager lock, acquires a strong reference to the returned
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// object under the lock, and returns the strong reference.
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template <typename FileInfoTableOp>
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[[nodiscard]] SafeRefPtr<FileInfo> AcquireFileInfo(
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const FileInfoTableOp& aFileInfoTableOp) const {
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if (!AssertValid()) {
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// In release, the assertions are disabled.
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return nullptr;
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}
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// We cannot simply change this to SafeRefPtr<FileInfo>, because
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// FileInfo::AddRef also acquires the FileManager::Mutex.
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auto fileInfo = [&aFileInfoTableOp]() -> RefPtr<FileInfo> {
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AutoLock lock(FileManager::Mutex());
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const auto maybeFileInfo = aFileInfoTableOp();
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if (maybeFileInfo) {
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const auto& fileInfo = maybeFileInfo.ref();
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fileInfo->LockedAddRef();
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return dont_AddRef(fileInfo.get());
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}
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return {};
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}();
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return SafeRefPtr{std::move(fileInfo)};
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}
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protected:
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bool AssertValid() const {
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if (NS_WARN_IF(static_cast<const FileManager*>(this)->Invalidated())) {
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MOZ_ASSERT(false);
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return false;
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}
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return true;
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}
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#ifdef DEBUG
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~FileManagerBase() { MOZ_ASSERT(mFileInfos.IsEmpty()); }
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#else
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~FileManagerBase() = default;
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#endif
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// Access to the following fields must be protected by
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// FileManager::Mutex()
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int64_t mLastFileId = 0;
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nsTHashMap<nsUint64HashKey, NotNull<FileInfo*>> mFileInfos;
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FlippedOnce<false> mInvalidated;
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};
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} // namespace indexedDB
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_indexeddb_filemanagerbase_h__
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