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0e46119bb9
This patch wraps the uint64_t type in a Maybe container, so the client usage can represent a state when there are no files on disk for the given client. Zero usage then represents a state when there are some files but they are empty or the client tracks logical size (not physical size of files on disk) and the logical size is zero. This can be useful especially for LocalStorage. Differential Revision: https://phabricator.services.mozilla.com/D38181 --HG-- extra : moz-landing-system : lando
70 lines
1.7 KiB
C++
70 lines
1.7 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_quota_usageinfo_h__
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#define mozilla_dom_quota_usageinfo_h__
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#include "mozilla/dom/quota/QuotaCommon.h"
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#include "mozilla/Atomics.h"
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#include "mozilla/CheckedInt.h"
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BEGIN_QUOTA_NAMESPACE
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class UsageInfo final {
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public:
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void Append(const UsageInfo& aUsageInfo) {
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IncrementUsage(mDatabaseUsage, aUsageInfo.mDatabaseUsage);
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IncrementUsage(mFileUsage, aUsageInfo.mFileUsage);
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}
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void AppendToDatabaseUsage(const Maybe<uint64_t>& aUsage) {
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IncrementUsage(mDatabaseUsage, aUsage);
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}
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void AppendToFileUsage(const Maybe<uint64_t>& aUsage) {
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IncrementUsage(mFileUsage, aUsage);
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}
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const Maybe<uint64_t>& DatabaseUsage() const { return mDatabaseUsage; }
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const Maybe<uint64_t>& FileUsage() const { return mFileUsage; }
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Maybe<uint64_t> TotalUsage() {
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Maybe<uint64_t> totalUsage;
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IncrementUsage(totalUsage, mDatabaseUsage);
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IncrementUsage(totalUsage, mFileUsage);
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return totalUsage;
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}
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static void IncrementUsage(Maybe<uint64_t>& aUsage,
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const Maybe<uint64_t>& aDelta) {
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if (aDelta.isNothing()) {
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return;
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}
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CheckedUint64 value = aUsage.valueOr(0);
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value += aDelta.value();
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if (value.isValid()) {
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aUsage = Some(value.value());
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} else {
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aUsage = Some(UINT64_MAX);
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}
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}
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private:
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Maybe<uint64_t> mDatabaseUsage;
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Maybe<uint64_t> mFileUsage;
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};
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END_QUOTA_NAMESPACE
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#endif // mozilla_dom_quota_usageinfo_h__
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