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fbdb46f5cb
Reviewed By: chadaustin Differential Revision: D17872966 fbshipit-source-id: cd60a364a2146f0dadbeca693b1d4a5d7c97ff63
65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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#include <folly/String.h>
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#include <rocksdb/db.h>
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#include <memory>
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#include <string>
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namespace facebook {
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namespace eden {
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enum class RocksDBOpenMode {
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ReadOnly,
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ReadWrite,
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};
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/**
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* This class is the holder of the database and column family handles
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* required to interact with our local rocksdb store.
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* RocksDB requires that we delete the column family handles prior
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* to deleting the DB so we need to manage the lifetime and
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* destruction order with this class.
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*/
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struct RocksHandles {
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std::unique_ptr<rocksdb::DB> db;
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// The order of these columns matches the descriptors passed
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// as column_descriptors to createRocksDb().
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std::vector<std::unique_ptr<rocksdb::ColumnFamilyHandle>> columns;
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/**
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* Note that the columns MUST be destroyed prior to the DB,
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* so we have a custom destructor for that purpose.
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*/
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~RocksHandles();
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/**
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* Returns an instance of a RocksDB that uses the specified directory for
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* storage. If there is an existing RocksDB at that path with
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* column_descriptors that match the requested set then it will be opened and
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* returned. If there is no existing RocksDB at that location a new one will
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* be initialized using the requested column_descriptors. Otherwise (an
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* existing RocksDB has mismatched column_descriptors) will throw an
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* exception.
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*/
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RocksHandles(
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folly::StringPiece dbPath,
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RocksDBOpenMode mode,
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const rocksdb::Options& options,
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const std::vector<rocksdb::ColumnFamilyDescriptor>& columnDescriptors);
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RocksHandles(RocksHandles&&) = default;
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RocksHandles& operator=(RocksHandles&&) = default;
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void close();
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};
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} // namespace eden
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} // namespace facebook
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