зеркало из https://github.com/mozilla/gecko-dev.git
132 строки
3.6 KiB
C++
132 строки
3.6 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
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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 "nsDataHashtable.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.Get(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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FileInfo* fileInfo =
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new 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.Put(id, fileInfo);
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return 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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already_AddRefed<FileInfo> fileInfo = [&aFileInfoTableOp] {
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AutoLock lock(FileManager::Mutex());
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FileInfo* fileInfo = aFileInfoTableOp();
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if (fileInfo) {
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fileInfo->LockedAddRef();
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}
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return dont_AddRef(fileInfo);
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}();
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return SafeRefPtr{RefPtr<FileInfo>{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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nsDataHashtable<nsUint64HashKey, 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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