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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "filechunk.h"
#include "storebybucket.h"
#include <vespa/vespalib/data/memorydatastore.h>
namespace search { class LogDataStore; }
namespace search::docstore {
/**
* A simple write through implementation of the IWriteData interface.
*/
class Compacter : public IWriteData
{
public:
Compacter(LogDataStore & ds) : _ds(ds) { }
void write(LockGuard guard, uint32_t chunkId, uint32_t lid, const void *buffer, size_t sz) override;
void close() override { }
private:
LogDataStore & _ds;
};
/**
* This will split the incoming data into buckets.
* The buckets data will then be written out in bucket order.
* The buckets will be ordered, and the objects inside the buckets will be further ordered.
* All data are kept compressed to minimize memory usage.
**/
class BucketCompacter : public IWriteData, public StoreByBucket::IWrite
{
using CompressionConfig = vespalib::compression::CompressionConfig;
using Executor = vespalib::Executor;
public:
using FileId = FileChunk::FileId;
BucketCompacter(size_t maxSignificantBucketBits, CompressionConfig compression, LogDataStore & ds,
Executor & executor, const IBucketizer & bucketizer, FileId source, FileId destination);
void write(LockGuard guard, uint32_t chunkId, uint32_t lid, const void *buffer, size_t sz) override ;
void write(BucketId bucketId, uint32_t chunkId, uint32_t lid, const void *buffer, size_t sz) override;
void close() override;
private:
using GenerationHandler = vespalib::GenerationHandler;
FileId getDestinationId(const LockGuard & guard) const;
size_t _unSignificantBucketBits;
FileId _sourceFileId;
FileId _destinationFileId;
LogDataStore & _ds;
const IBucketizer & _bucketizer;
uint64_t _writeCount;
vespalib::duration _maxBucketGuardDuration;
vespalib::steady_time _lastSample;
std::mutex _lock;
vespalib::MemoryDataStore _backingMemory;
std::vector<StoreByBucket> _tmpStore;
GenerationHandler::Guard _lidGuard;
GenerationHandler::Guard _bucketizerGuard;
vespalib::hash_map<uint64_t, uint32_t> _stat;
};
}
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