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+// 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).
+//
+// 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 <stdint.h>
+
+#include <array>
+#include <limits>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "db/version_edit.h"
+#include "rocksdb/flush_block_policy.h"
+#include "rocksdb/listener.h"
+#include "rocksdb/options.h"
+#include "rocksdb/status.h"
+#include "rocksdb/table.h"
+#include "table/meta_blocks.h"
+#include "table/table_builder.h"
+#include "util/compression.h"
+
+namespace ROCKSDB_NAMESPACE {
+
+class BlockBuilder;
+class BlockHandle;
+class WritableFile;
+struct BlockBasedTableOptions;
+
+extern const uint64_t kBlockBasedTableMagicNumber;
+extern const uint64_t kLegacyBlockBasedTableMagicNumber;
+
+class BlockBasedTableBuilder : public TableBuilder {
+ public:
+ // Create a builder that will store the contents of the table it is
+ // building in *file. Does not close the file. It is up to the
+ // caller to close the file after calling Finish().
+ BlockBasedTableBuilder(const BlockBasedTableOptions& table_options,
+ const TableBuilderOptions& table_builder_options,
+ WritableFileWriter* file);
+
+ // No copying allowed
+ BlockBasedTableBuilder(const BlockBasedTableBuilder&) = delete;
+ BlockBasedTableBuilder& operator=(const BlockBasedTableBuilder&) = delete;
+
+ // REQUIRES: Either Finish() or Abandon() has been called.
+ ~BlockBasedTableBuilder();
+
+ // Add key,value to the table being constructed.
+ // REQUIRES: key is after any previously added key according to comparator.
+ // REQUIRES: Finish(), Abandon() have not been called
+ void Add(const Slice& key, const Slice& value) override;
+
+ // Return non-ok iff some error has been detected.
+ Status status() const override;
+
+ // Return non-ok iff some error happens during IO.
+ IOStatus io_status() const override;
+
+ // Finish building the table. Stops using the file passed to the
+ // constructor after this function returns.
+ // REQUIRES: Finish(), Abandon() have not been called
+ Status Finish() override;
+
+ // Indicate that the contents of this builder should be abandoned. Stops
+ // using the file passed to the constructor after this function returns.
+ // If the caller is not going to call Finish(), it must call Abandon()
+ // before destroying this builder.
+ // REQUIRES: Finish(), Abandon() have not been called
+ void Abandon() override;
+
+ // Number of calls to Add() so far.
+ uint64_t NumEntries() const override;
+
+ bool IsEmpty() const override;
+
+ // Size of the file generated so far. If invoked after a successful
+ // Finish() call, returns the size of the final generated file.
+ uint64_t FileSize() const override;
+
+ // Estimated size of the file generated so far. This is used when
+ // FileSize() cannot estimate final SST size, e.g. parallel compression
+ // is enabled.
+ uint64_t EstimatedFileSize() const override;
+
+ bool NeedCompact() const override;
+
+ // Get table properties
+ TableProperties GetTableProperties() const override;
+
+ // Get file checksum
+ std::string GetFileChecksum() const override;
+
+ // Get file checksum function name
+ const char* GetFileChecksumFuncName() const override;
+
+ void SetSeqnoTimeTableProperties(
+ const std::string& encoded_seqno_to_time_mapping,
+ uint64_t oldest_ancestor_time) override;
+
+ private:
+ bool ok() const { return status().ok(); }
+
+ // Transition state from buffered to unbuffered. See `Rep::State` API comment
+ // for details of the states.
+ // REQUIRES: `rep_->state == kBuffered`
+ void EnterUnbuffered();
+
+ // Call block's Finish() method and then
+ // - in buffered mode, buffer the uncompressed block contents.
+ // - in unbuffered mode, write the compressed block contents to file.
+ void WriteBlock(BlockBuilder* block, BlockHandle* handle,
+ BlockType blocktype);
+
+ // Compress and write block content to the file.
+ void WriteBlock(const Slice& block_contents, BlockHandle* handle,
+ BlockType block_type);
+ // Directly write data to the file.
+ void WriteMaybeCompressedBlock(const Slice& data, CompressionType,
+ BlockHandle* handle, BlockType block_type,
+ const Slice* raw_data = nullptr);
+
+ void SetupCacheKeyPrefix(const TableBuilderOptions& tbo);
+
+ template <typename TBlocklike>
+ Status InsertBlockInCache(const Slice& block_contents,
+ const BlockHandle* handle, BlockType block_type);
+
+ Status InsertBlockInCacheHelper(const Slice& block_contents,
+ const BlockHandle* handle,
+ BlockType block_type);
+
+ Status InsertBlockInCompressedCache(const Slice& block_contents,
+ const CompressionType type,
+ const BlockHandle* handle);
+
+ void WriteFilterBlock(MetaIndexBuilder* meta_index_builder);
+ void WriteIndexBlock(MetaIndexBuilder* meta_index_builder,
+ BlockHandle* index_block_handle);
+ void WritePropertiesBlock(MetaIndexBuilder* meta_index_builder);
+ void WriteCompressionDictBlock(MetaIndexBuilder* meta_index_builder);
+ void WriteRangeDelBlock(MetaIndexBuilder* meta_index_builder);
+ void WriteFooter(BlockHandle& metaindex_block_handle,
+ BlockHandle& index_block_handle);
+
+ struct Rep;
+ class BlockBasedTablePropertiesCollectorFactory;
+ class BlockBasedTablePropertiesCollector;
+ Rep* rep_;
+
+ struct ParallelCompressionRep;
+
+ // Advanced operation: flush any buffered key/value pairs to file.
+ // Can be used to ensure that two adjacent entries never live in
+ // the same data block. Most clients should not need to use this method.
+ // REQUIRES: Finish(), Abandon() have not been called
+ void Flush();
+
+ // Some compression libraries fail when the uncompressed size is bigger than
+ // int. If uncompressed size is bigger than kCompressionSizeLimit, don't
+ // compress it
+ const uint64_t kCompressionSizeLimit = std::numeric_limits<int>::max();
+
+ // Get blocks from mem-table walking thread, compress them and
+ // pass them to the write thread. Used in parallel compression mode only
+ void BGWorkCompression(const CompressionContext& compression_ctx,
+ UncompressionContext* verify_ctx);
+
+ // Given uncompressed block content, try to compress it and return result and
+ // compression type
+ void CompressAndVerifyBlock(const Slice& uncompressed_block_data,
+ bool is_data_block,
+ const CompressionContext& compression_ctx,
+ UncompressionContext* verify_ctx,
+ std::string* compressed_output,
+ Slice* result_block_contents,
+ CompressionType* result_compression_type,
+ Status* out_status);
+
+ // Get compressed blocks from BGWorkCompression and write them into SST
+ void BGWorkWriteMaybeCompressedBlock();
+
+ // Initialize parallel compression context and
+ // start BGWorkCompression and BGWorkWriteMaybeCompressedBlock threads
+ void StartParallelCompression();
+
+ // Stop BGWorkCompression and BGWorkWriteMaybeCompressedBlock threads
+ void StopParallelCompression();
+};
+
+Slice CompressBlock(const Slice& uncompressed_data, const CompressionInfo& info,
+ CompressionType* type, uint32_t format_version,
+ bool do_sample, std::string* compressed_output,
+ std::string* sampled_output_fast,
+ std::string* sampled_output_slow);
+
+} // namespace ROCKSDB_NAMESPACE