6df589b446
Summary: It is experimental. Allow users to return from a call back function TablePropertiesCollector::NeedCompact(), based on the data in the file. It can be used to allow users to suggest DB to clear up delete tombstones faster. Test Plan: Add a unit test. Reviewers: igor, yhchiang, kradhakrishnan, rven Reviewed By: rven Subscribers: yoshinorim, MarkCallaghan, maykov, leveldb, dhruba Differential Revision: https://reviews.facebook.net/D39585
110 lines
4.2 KiB
C++
110 lines
4.2 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 <stdint.h>
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#include <limits>
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#include <string>
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#include <utility>
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#include <vector>
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#include "rocksdb/flush_block_policy.h"
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#include "rocksdb/options.h"
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#include "rocksdb/status.h"
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#include "table/table_builder.h"
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namespace rocksdb {
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class BlockBuilder;
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class BlockHandle;
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class WritableFile;
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struct BlockBasedTableOptions;
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class BlockBasedTableBuilder : public TableBuilder {
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public:
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// Create a builder that will store the contents of the table it is
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// building in *file. Does not close the file. It is up to the
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// caller to close the file after calling Finish().
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BlockBasedTableBuilder(
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const ImmutableCFOptions& ioptions,
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const BlockBasedTableOptions& table_options,
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const InternalKeyComparator& internal_comparator,
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const std::vector<std::unique_ptr<IntTblPropCollectorFactory>>*
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int_tbl_prop_collector_factories,
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WritableFile* file, const CompressionType compression_type,
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const CompressionOptions& compression_opts, const bool skip_filters);
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// REQUIRES: Either Finish() or Abandon() has been called.
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~BlockBasedTableBuilder();
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// Add key,value to the table being constructed.
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// REQUIRES: key is after any previously added key according to comparator.
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// REQUIRES: Finish(), Abandon() have not been called
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void Add(const Slice& key, const Slice& value) override;
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// Return non-ok iff some error has been detected.
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Status status() const override;
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// Finish building the table. Stops using the file passed to the
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// constructor after this function returns.
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// REQUIRES: Finish(), Abandon() have not been called
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Status Finish() override;
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// Indicate that the contents of this builder should be abandoned. Stops
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// using the file passed to the constructor after this function returns.
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// If the caller is not going to call Finish(), it must call Abandon()
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// before destroying this builder.
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// REQUIRES: Finish(), Abandon() have not been called
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void Abandon() override;
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// Number of calls to Add() so far.
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uint64_t NumEntries() const override;
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// Size of the file generated so far. If invoked after a successful
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// Finish() call, returns the size of the final generated file.
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uint64_t FileSize() const override;
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bool NeedCompact() const override;
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// Get table properties
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TableProperties GetTableProperties() const override;
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private:
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bool ok() const { return status().ok(); }
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// Call block's Finish() method and then write the finalize block contents to
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// file.
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void WriteBlock(BlockBuilder* block, BlockHandle* handle);
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// Directly write block content to the file.
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void WriteBlock(const Slice& block_contents, BlockHandle* handle);
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void WriteRawBlock(const Slice& data, CompressionType, BlockHandle* handle);
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Status InsertBlockInCache(const Slice& block_contents,
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const CompressionType type,
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const BlockHandle* handle);
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struct Rep;
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class BlockBasedTablePropertiesCollectorFactory;
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class BlockBasedTablePropertiesCollector;
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Rep* rep_;
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// Advanced operation: flush any buffered key/value pairs to file.
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// Can be used to ensure that two adjacent entries never live in
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// the same data block. Most clients should not need to use this method.
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// REQUIRES: Finish(), Abandon() have not been called
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void Flush();
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// Some compression libraries fail when the raw size is bigger than int. If
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// uncompressed size is bigger than kCompressionSizeLimit, don't compress it
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const uint64_t kCompressionSizeLimit = std::numeric_limits<int>::max();
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// No copying allowed
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BlockBasedTableBuilder(const BlockBasedTableBuilder&) = delete;
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void operator=(const BlockBasedTableBuilder&) = delete;
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};
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} // namespace rocksdb
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