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