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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 "idiskindex.h"
#include "imemoryindex.h"
#include <vespa/searchcommon/common/schema.h>
#include <vespa/searchlib/common/serialnum.h>
#include <vespa/searchlib/diskindex/docidmapper.h>
#include <vespa/searchlib/index/i_field_length_inspector.h>
namespace search { class IFlushToken; }
namespace searchcorespi::index {
/**
* Interface for operations needed by an index maintainer.
*/
struct IIndexMaintainerOperations {
using IFieldLengthInspector = search::index::IFieldLengthInspector;
using Schema = search::index::Schema;
using SelectorArray = search::diskindex::SelectorArray;
virtual ~IIndexMaintainerOperations() = default;
/**
* Creates a new memory index using the given schema.
*/
virtual IMemoryIndex::SP createMemoryIndex(const Schema& schema,
const IFieldLengthInspector& inspector,
search::SerialNum serialNum) = 0;
/**
* Loads a disk index from the given directory.
*/
virtual IDiskIndex::SP loadDiskIndex(const vespalib::string &indexDir) = 0;
/**
* Reloads the given disk index and returns a new instance.
*/
virtual IDiskIndex::SP reloadDiskIndex(const IDiskIndex &oldIndex) = 0;
/**
* Runs fusion on a given set of input disk indexes to create a fusioned output disk index.
* The selector array contains a source for all local document ids ([0, docIdLimit>)
* in the range [0, sources.size()> and is used to determine in which input disk index
* a document is located.
*
* @param schema the schema of the resulting fusioned disk index.
* @param outputDir the output directory of the fusioned disk index.
* @param sources the directories of the input disk indexes.
* @param selectorArray the array specifying in which input disk index a document is located.
* @param lastSerialNum the serial number of the last operation in the last input disk index.
*/
virtual bool runFusion(const Schema &schema,
const vespalib::string &outputDir,
const std::vector<vespalib::string> &sources,
const SelectorArray &selectorArray,
search::SerialNum lastSerialNum,
std::shared_ptr<search::IFlushToken> flush_token) = 0;
};
}
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