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rust-rocksdb/table/sst_file_writer_collectors.h

95 lines
3.2 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 "db/table_properties_collector.h"
#include "rocksdb/types.h"
#include "util/coding.h"
#include "util/string_util.h"
namespace ROCKSDB_NAMESPACE {
// Table Properties that are specific to tables created by SstFileWriter.
struct ExternalSstFilePropertyNames {
// value of this property is a fixed uint32 number.
static const std::string kVersion;
// value of this property is a fixed uint64 number.
static const std::string kGlobalSeqno;
};
// PropertiesCollector used to add properties specific to tables
// generated by SstFileWriter
class SstFileWriterPropertiesCollector : public IntTblPropCollector {
public:
explicit SstFileWriterPropertiesCollector(int32_t version,
SequenceNumber global_seqno)
: version_(version), global_seqno_(global_seqno) {}
virtual Status InternalAdd(const Slice& /*key*/, const Slice& /*value*/,
uint64_t /*file_size*/) override {
// Intentionally left blank. Have no interest in collecting stats for
// individual key/value pairs.
return Status::OK();
}
virtual void BlockAdd(uint64_t /* block_uncomp_bytes */,
uint64_t /* block_compressed_bytes_fast */,
uint64_t /* block_compressed_bytes_slow */) override {
// Intentionally left blank. No interest in collecting stats for
// blocks.
return;
}
virtual Status Finish(UserCollectedProperties* properties) override {
// File version
std::string version_val;
PutFixed32(&version_val, static_cast<uint32_t>(version_));
properties->insert({ExternalSstFilePropertyNames::kVersion, version_val});
// Global Sequence number
std::string seqno_val;
PutFixed64(&seqno_val, static_cast<uint64_t>(global_seqno_));
properties->insert({ExternalSstFilePropertyNames::kGlobalSeqno, seqno_val});
return Status::OK();
}
virtual const char* Name() const override {
return "SstFileWriterPropertiesCollector";
}
virtual UserCollectedProperties GetReadableProperties() const override {
return {{ExternalSstFilePropertyNames::kVersion, std::to_string(version_)}};
}
private:
int32_t version_;
SequenceNumber global_seqno_;
};
class SstFileWriterPropertiesCollectorFactory
: public IntTblPropCollectorFactory {
public:
explicit SstFileWriterPropertiesCollectorFactory(int32_t version,
SequenceNumber global_seqno)
: version_(version), global_seqno_(global_seqno) {}
virtual IntTblPropCollector* CreateIntTblPropCollector(
uint32_t /*column_family_id*/, int /* level_at_creation */) override {
return new SstFileWriterPropertiesCollector(version_, global_seqno_);
}
virtual const char* Name() const override {
return "SstFileWriterPropertiesCollector";
}
private:
int32_t version_;
SequenceNumber global_seqno_;
};
} // namespace ROCKSDB_NAMESPACE