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rocksdb/db/write_batch_internal.h

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// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
#pragma once
#include "rocksdb/types.h"
#include "rocksdb/write_batch.h"
#include "rocksdb/db.h"
#include "rocksdb/options.h"
namespace rocksdb {
class MemTable;
class ColumnFamilyMemTables {
public:
virtual ~ColumnFamilyMemTables() {}
virtual bool Seek(uint32_t column_family_id) = 0;
// returns true if the update to memtable should be ignored
// (useful when recovering from log whose updates have already
// been processed)
virtual uint64_t GetLogNumber() const = 0;
virtual MemTable* GetMemTable() const = 0;
virtual const Options* GetOptions() const = 0;
virtual ColumnFamilyHandle* GetColumnFamilyHandle() = 0;
};
class ColumnFamilyMemTablesDefault : public ColumnFamilyMemTables {
public:
ColumnFamilyMemTablesDefault(MemTable* mem, const Options* options)
: ok_(false), mem_(mem), options_(options) {}
bool Seek(uint32_t column_family_id) override {
ok_ = (column_family_id == 0);
return ok_;
}
uint64_t GetLogNumber() const override { return 0; }
MemTable* GetMemTable() const override {
assert(ok_);
return mem_;
}
const Options* GetOptions() const override {
assert(ok_);
return options_;
}
ColumnFamilyHandle* GetColumnFamilyHandle() override { return nullptr; }
private:
bool ok_;
MemTable* mem_;
const Options* const options_;
};
// WriteBatchInternal provides static methods for manipulating a
// WriteBatch that we don't want in the public WriteBatch interface.
class WriteBatchInternal {
public:
// WriteBatch methods with column_family_id instead of ColumnFamilyHandle*
static void Put(WriteBatch* batch, uint32_t column_family_id,
const Slice& key, const Slice& value);
static void Put(WriteBatch* batch, uint32_t column_family_id,
const SliceParts& key, const SliceParts& value);
static void Delete(WriteBatch* batch, uint32_t column_family_id,
const Slice& key);
static void Merge(WriteBatch* batch, uint32_t column_family_id,
const Slice& key, const Slice& value);
// Return the number of entries in the batch.
static int Count(const WriteBatch* batch);
// Set the count for the number of entries in the batch.
static void SetCount(WriteBatch* batch, int n);
// Return the seqeunce number for the start of this batch.
static SequenceNumber Sequence(const WriteBatch* batch);
// Store the specified number as the seqeunce number for the start of
// this batch.
static void SetSequence(WriteBatch* batch, SequenceNumber seq);
static Slice Contents(const WriteBatch* batch) {
return Slice(batch->rep_);
}
static size_t ByteSize(const WriteBatch* batch) {
return batch->rep_.size();
}
static void SetContents(WriteBatch* batch, const Slice& contents);
// Inserts batch entries into memtable
// If dont_filter_deletes is false AND options.filter_deletes is true,
// then --> Drops deletes in batch if db->KeyMayExist returns false
// If recovery == true, this means InsertInto is executed on a recovery
// code-path. WriteBatch referencing a dropped column family can be
// found on a recovery code-path and should be ignored (recovery should not
// fail). Additionally, the memtable will be updated only if
// memtables->GetLogNumber() >= log_number
// However, if recovery == false, any WriteBatch referencing
// non-existing column family will return a failure. Also, log_number is
// ignored in that case
static Status InsertInto(const WriteBatch* batch,
ColumnFamilyMemTables* memtables,
bool recovery = false, uint64_t log_number = 0,
DB* db = nullptr,
const bool dont_filter_deletes = true);
static void Append(WriteBatch* dst, const WriteBatch* src);
};
} // namespace rocksdb