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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_localstorage_LSWriteOptimizerImpl_h
#define mozilla_dom_localstorage_LSWriteOptimizerImpl_h
#include "LSWriteOptimizer.h"
namespace mozilla {
namespace dom {
template <typename T, typename U>
void LSWriteOptimizer<T, U>::InsertItem(const nsAString& aKey, const T& aValue,
int64_t aDelta) {
AssertIsOnOwningThread();
WriteInfo* existingWriteInfo;
UniquePtr<WriteInfo> newWriteInfo;
if (mWriteInfos.Get(aKey, &existingWriteInfo) &&
existingWriteInfo->GetType() == WriteInfo::DeleteItem) {
// We could just simply replace the deletion with ordinary update, but
// that
// would preserve item's original position/index. Imagine a case when we
// have only one existing key k1. Now let's create a new optimizer and
// remove k1, add k2 and add k1 back. The final order should be k2, k1
// (ordinary update would produce k1, k2). So we need to differentiate
// between normal update and "optimized" update which resulted from a
// deletion followed by an insertion. We use the UpdateWithMove flag for
// this.
newWriteInfo = MakeUnique<UpdateItemInfo>(NextSerialNumber(), aKey, aValue,
/* aUpdateWithMove */ true);
} else {
newWriteInfo = MakeUnique<InsertItemInfo>(NextSerialNumber(), aKey, aValue);
}
mWriteInfos.Put(aKey, std::move(newWriteInfo));
mTotalDelta += aDelta;
}
template <typename T, typename U>
void LSWriteOptimizer<T, U>::UpdateItem(const nsAString& aKey, const T& aValue,
int64_t aDelta) {
AssertIsOnOwningThread();
WriteInfo* existingWriteInfo;
UniquePtr<WriteInfo> newWriteInfo;
if (mWriteInfos.Get(aKey, &existingWriteInfo) &&
existingWriteInfo->GetType() == WriteInfo::InsertItem) {
newWriteInfo = MakeUnique<InsertItemInfo>(NextSerialNumber(), aKey, aValue);
} else {
newWriteInfo = MakeUnique<UpdateItemInfo>(NextSerialNumber(), aKey, aValue,
/* aUpdateWithMove */ false);
}
mWriteInfos.Put(aKey, std::move(newWriteInfo));
mTotalDelta += aDelta;
}
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_localstorage_LSWriteOptimizerImpl_h
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