зеркало из https://github.com/mozilla/gecko-dev.git
49 строки
1.8 KiB
C++
49 строки
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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_KEY_VALUE_STORAGE_H
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#define MOZILLA_KEY_VALUE_STORAGE_H
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#include "mozilla/MozPromise.h"
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#include "nsIKeyValue.h"
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namespace mozilla {
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/* A wrapper class around kv store service, which allows storing a pair of key
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* value permanently. The class must be used from the parent process, where
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* there is no sandbox because it requires access to the directory that the
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* database is located. */
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class KeyValueStorage final {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(KeyValueStorage)
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/* Store permanently the value in the Key. */
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RefPtr<GenericPromise> Put(const nsACString& aName, const nsACString& aKey,
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int32_t aValue);
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/* Get the value stored in the aKey. If the aKey does not exist the promise is
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* resolved with the value -1. */
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typedef MozPromise<int32_t, nsresult, true> GetPromise;
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RefPtr<GetPromise> Get(const nsACString& aName, const nsACString& aKey);
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/* Clear all the key/value pairs from the aName database. */
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RefPtr<GenericPromise> Clear(const nsACString& aName);
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private:
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/* Create, if doesn't exist, and initialize the database with a given name. */
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RefPtr<GenericPromise> Init();
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RefPtr<GenericPromise> Put(const nsACString& aKey, int32_t aValue);
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RefPtr<GetPromise> Get(const nsACString& aKey);
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RefPtr<GenericPromise> Clear();
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~KeyValueStorage() = default;
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RefPtr<nsIKeyValueDatabase> mDatabase;
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nsCString mDatabaseName;
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};
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} // namespace mozilla
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#endif // MOZILLA_KEY_VALUE_STORAGE_H
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