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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "iindexmaintaineroperations.h"
#include "indexdisklayout.h"
#include <vespa/searchcommon/common/schema.h>
#include <vespa/searchlib/common/tunefileinfo.h>
namespace search
{
namespace common
{
class FileHeaderContext;
}
}
namespace searchcorespi {
namespace index {
struct FusionSpec;
/**
* FusionRunner runs fusion on a set of disk indexes, specified as a
* vector of ids. The disk indexes must be stored in directories named
* "index.flush.<id>" within the base dir, and the fusioned indexes
* will be stored similarly in directories named "index.fusion.<id>".
**/
class FusionRunner {
const IndexDiskLayout _diskLayout;
const search::index::Schema _schema;
const search::TuneFileAttributes _tuneFileAttributes;
const search::common::FileHeaderContext &_fileHeaderContext;
public:
/**
* Create a FusionRunner that operates on indexes stored in the
* base dir.
**/
FusionRunner(const vespalib::string &base_dir,
const search::index::Schema &schema,
const search::TuneFileAttributes &tuneFileAttributes,
const search::common::FileHeaderContext &fileHeaderContext);
~FusionRunner();
/**
* Combine the indexes specified by the ids by running fusion.
*
* @param fusion_spec the specification on which indexes to run fusion on.
* @param lastSerialNum the serial number of the last flushed index part of the fusion spec.
* @param operations interface used for running the actual fusion.
* @return the id of the fusioned disk index
**/
uint32_t fuse(const FusionSpec &fusion_spec,
search::SerialNum lastSerialNum,
IIndexMaintainerOperations &operations,
std::shared_ptr<search::IFlushToken> flush_token);
};
} // namespace index
} // namespace searchcorespi
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