f24a3ee52d
Summary: This one is big. It adds ability to write to and read from different column families (see the unit test). It also supports recovery of different column families from log, which was the hardest part to reason about. We need to make sure to never delete the log file which has unflushed data from any column family. To support that, I added another concept, which is versions_->MinLogNumber() Test Plan: Added a unit test in column_family_test Reviewers: dhruba, haobo, sdong, kailiu CC: leveldb Differential Revision: https://reviews.facebook.net/D15537
68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#pragma once
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#include "rocksdb/types.h"
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#include "rocksdb/write_batch.h"
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#include "rocksdb/db.h"
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#include "rocksdb/options.h"
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namespace rocksdb {
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class MemTable;
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class ColumnFamilyMemTables {
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public:
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virtual MemTable* GetMemTable(uint32_t column_family_id) = 0;
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};
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// WriteBatchInternal provides static methods for manipulating a
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// WriteBatch that we don't want in the public WriteBatch interface.
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class WriteBatchInternal {
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public:
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// Return the number of entries in the batch.
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static int Count(const WriteBatch* batch);
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// Set the count for the number of entries in the batch.
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static void SetCount(WriteBatch* batch, int n);
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// Return the seqeunce number for the start of this batch.
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static SequenceNumber Sequence(const WriteBatch* batch);
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// Store the specified number as the seqeunce number for the start of
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// this batch.
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static void SetSequence(WriteBatch* batch, SequenceNumber seq);
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static Slice Contents(const WriteBatch* batch) {
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return Slice(batch->rep_);
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}
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static size_t ByteSize(const WriteBatch* batch) {
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return batch->rep_.size();
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}
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static void SetContents(WriteBatch* batch, const Slice& contents);
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// Inserts batch entries into memtable
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// Drops deletes in batch if filter_del is set to true and
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// db->KeyMayExist returns false
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static Status InsertInto(const WriteBatch* batch, MemTable* memtable,
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const Options* opts, DB* db = nullptr,
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const bool filter_del = false);
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static Status InsertInto(const WriteBatch* batch,
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ColumnFamilyMemTables* memtables,
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const Options* opts, DB* db = nullptr,
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const bool filter_del = false);
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static void Append(WriteBatch* dst, const WriteBatch* src);
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};
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} // namespace rocksdb
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