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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_INDEXEDDB_FILEINFOMANAGER_H_
#define DOM_INDEXEDDB_FILEINFOMANAGER_H_
#include "FileInfo.h"
#include "FlippedOnce.h"
#include "mozilla/Attributes.h"
#include "mozilla/Mutex.h"
#include "mozilla/StaticMutex.h"
#include "nsHashKeys.h"
#include "nsISupportsImpl.h"
#include "nsTHashMap.h"
namespace mozilla::dom::indexedDB {
class FileInfoManagerBase {
public:
bool Invalidated() const { return mInvalidated; }
protected:
bool AssertValid() const {
if (NS_WARN_IF(Invalidated())) {
MOZ_ASSERT(false);
return false;
}
return true;
}
void Invalidate() { mInvalidated.Flip(); }
private:
FlippedOnce<false> mInvalidated;
};
template <typename FileManager>
class FileInfoManager : public FileInfoManagerBase {
public:
using FileInfoType = FileInfo<FileManager>;
using MutexType = StaticMutex;
using AutoLockType = mozilla::detail::BaseAutoLock<MutexType&>;
[[nodiscard]] SafeRefPtr<FileInfoType> GetFileInfo(int64_t aId) const {
return AcquireFileInfo([this, aId]() MOZ_REQUIRES(Mutex()) {
return mFileInfos.MaybeGet(aId);
});
}
bool ContainsFileInfo(int64_t aFileId) {
AutoLockType lock(Mutex());
return mFileInfos.Contains(aFileId);
}
[[nodiscard]] SafeRefPtr<FileInfoType> CreateFileInfo(
const Maybe<int64_t>& aMaybeId = Nothing(),
const nsrefcnt aDBRefCnt = 0) {
return AcquireFileInfo([this, &aMaybeId,
&aDBRefCnt]() MOZ_REQUIRES(Mutex()) {
const int64_t id = aMaybeId.isSome() ? *aMaybeId : ++mLastFileId;
auto fileInfo =
MakeNotNull<FileInfoType*>(FileInfoManagerGuard{},
SafeRefPtr{static_cast<FileManager*>(this),
AcquireStrongRefFromRawPtr{}},
id, aDBRefCnt);
mFileInfos.InsertOrUpdate(id, fileInfo);
if (aMaybeId.isSome()) {
mLastFileId = std::max(id, mLastFileId);
}
return Some(fileInfo);
});
}
void RemoveFileInfo(const int64_t aId, const AutoLockType& aFileMutexLock)
MOZ_REQUIRES(Mutex()) {
#ifdef DEBUG
aFileMutexLock.AssertOwns(Mutex());
#endif
mFileInfos.Remove(aId);
}
// After calling this method, callers should not call any more methods on this
// class.
virtual nsresult Invalidate() {
AutoLockType lock(Mutex());
FileInfoManagerBase::Invalidate();
mFileInfos.RemoveIf([](const auto& iter) {
FileInfoType* info = iter.Data();
MOZ_ASSERT(info);
return !info->LockedClearDBRefs(FileInfoManagerGuard{});
});
return NS_OK;
}
struct FileInfoManagerGuard {
FileInfoManagerGuard() = default;
};
static MutexType& Mutex() { return FileManager::MutexInstance(); }
private:
// Runs the given aFileInfoTableOp operation, which must return a FileInfo*,
// under the FileManager lock, acquires a strong reference to the returned
// object under the lock, and returns the strong reference.
template <typename FileInfoTableOp>
[[nodiscard]] SafeRefPtr<FileInfoType> AcquireFileInfo(
const FileInfoTableOp& aFileInfoTableOp) const {
if (!AssertValid()) {
// In release, the assertions are disabled.
return nullptr;
}
// We cannot simply change this to SafeRefPtr<FileInfo>, because
// FileInfo::AddRef also acquires the FileManager::Mutex.
auto fileInfo = [&aFileInfoTableOp]() -> RefPtr<FileInfoType> {
AutoLockType lock(Mutex());
const auto maybeFileInfo = aFileInfoTableOp();
if (maybeFileInfo) {
const auto& fileInfo = maybeFileInfo.ref();
fileInfo->LockedAddRef();
return dont_AddRef(fileInfo.get());
}
return {};
}();
return SafeRefPtr{std::move(fileInfo)};
}
// Access to the following private fields must be protected by
// FileManager::Mutex() which is now enforced by MOZ_GUARDED_BY annotations.
nsTHashMap<nsUint64HashKey, NotNull<FileInfoType*>> mFileInfos
MOZ_GUARDED_BY(Mutex());
int64_t mLastFileId MOZ_GUARDED_BY(Mutex()) = 0;
protected:
#ifdef DEBUG
~FileInfoManager() { MOZ_ASSERT(mFileInfos.IsEmpty()); }
#else
~FileInfoManager() = default;
#endif
};
} // namespace mozilla::dom::indexedDB
#endif // DOM_INDEXEDDB_FILEINFOMANAGER_H_
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