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rocksdb/include/rocksdb/flush_block_policy.h

62 lines
1.9 KiB

// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
#pragma once
#include <string>
#include "rocksdb/table.h"
namespace rocksdb {
class Slice;
class BlockBuilder;
struct Options;
// FlushBlockPolicy provides a configurable way to determine when to flush a
// block in the block based tables,
class FlushBlockPolicy {
public:
// Keep track of the key/value sequences and return the boolean value to
// determine if table builder should flush current data block.
virtual bool Update(const Slice& key,
const Slice& value) = 0;
virtual ~FlushBlockPolicy() { }
};
class FlushBlockPolicyFactory {
public:
// Return the name of the flush block policy.
virtual const char* Name() const = 0;
// Return a new block flush policy that flushes data blocks by data size.
// FlushBlockPolicy may need to access the metadata of the data block
// builder to determine when to flush the blocks.
//
// Callers must delete the result after any database that is using the
// result has been closed.
virtual FlushBlockPolicy* NewFlushBlockPolicy(
const BlockBasedTableOptions& table_options,
const BlockBuilder& data_block_builder) const = 0;
virtual ~FlushBlockPolicyFactory() { }
};
class FlushBlockBySizePolicyFactory : public FlushBlockPolicyFactory {
public:
FlushBlockBySizePolicyFactory() {}
const char* Name() const override { return "FlushBlockBySizePolicyFactory"; }
FlushBlockPolicy* NewFlushBlockPolicy(
const BlockBasedTableOptions& table_options,
const BlockBuilder& data_block_builder) const override;
static FlushBlockPolicy* NewFlushBlockPolicy(
const uint64_t size, const int deviation,
const BlockBuilder& data_block_builder);
};
} // rocksdb