49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
/*
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* OnDemandStore.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "flow/Arena.h"
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#include "flow/IRandom.h"
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#include "flow/Platform.h"
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#include "fdbserver/IKeyValueStore.h"
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// Create a key value store if and only if it is actually used
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class OnDemandStore : public IClosable, NonCopyable {
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std::string folder;
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UID myID;
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IKeyValueStore* store;
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Promise<Future<Void>> err;
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std::string prefix;
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void open();
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public:
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OnDemandStore(std::string const& folder, UID myID, std::string const& prefix);
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~OnDemandStore();
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IKeyValueStore* get();
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bool exists() const;
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IKeyValueStore* operator->();
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Future<Void> getError() const override;
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Future<Void> onClosed() const override;
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void dispose() override;
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void close() override;
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};
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