70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
/*
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* MemoryKeyValueStore.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 2013-2018 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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#ifndef FDBSERVER_MEMORYKEYVALUESTORE_H
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#define FDBSERVER_MEMORYKEYVALUESTORE_H
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#pragma once
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#include "fdbrpc/fdbrpc.h"
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#include "fdbserver/workloads/workloads.actor.h"
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#include <map>
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// An in-memory key-value store designed to mirror the contents of the database after performing sequences of operations
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class MemoryKeyValueStore {
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public:
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// Get the value associated with a key
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Optional<Value> get(KeyRef key) const;
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// Returns the key designated by a key selector
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Key getKey(KeySelectorRef selector) const;
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// Gets a range of key-value pairs, returning a maximum of <limit> results
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RangeResult getRange(KeyRangeRef range, int limit, Reverse reverse) const;
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// Stores a key-value pair in the database
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void set(KeyRef key, ValueRef value);
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// Removes a key from the database
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void clear(KeyRef key);
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// Removes a range of keys from the database
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void clear(KeyRangeRef range);
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// The number of keys in the database
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uint64_t size() const;
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// The first key in the database; returned by key selectors that choose a key off the front
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Key startKey() const;
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// The last key in the database; returned by key selectors that choose a key off the back
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Key endKey() const;
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// Debugging function that prints all key-value pairs
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void printContents() const;
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private:
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// A map holding the key-value pairs
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std::map<Key, Value> store;
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};
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#endif
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