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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 "lid_gid_key_comparator.h"
#include "i_store.h"
#include <vespa/vespalib/btree/btreeiterator.h>
#include <vespa/searchlib/attribute/attributesaver.h>
namespace proton {
/*
* Class holding the necessary context for saving a document meta
* store. The generation guard in the parent class prevents lids from
* being reused during the save operation, but timestamp and
* bucketusedbits can reflect future operations relative to when the
* document meta store was logically saved. Thus it is important to
* replay the same operations at startup.
*/
class DocumentMetaStoreSaver : public search::AttributeSaver
{
public:
using KeyComp = documentmetastore::LidGidKeyComparator;
using DocId = documentmetastore::IStore::DocId;
using GidIterator = vespalib::btree::BTreeConstIterator<
documentmetastore::GidToLidMapKey,
vespalib::btree::BTreeNoLeafData,
vespalib::btree::NoAggregated,
const KeyComp &>;
using MetaDataView = vespalib::ConstArrayRef<RawDocumentMetaData>;
private:
GidIterator _gidIterator; // iterator over frozen tree
MetaDataView _metaDataView;
bool _writeDocSize;
bool onSave(search::IAttributeSaveTarget &saveTarget) override;
public:
DocumentMetaStoreSaver(vespalib::GenerationHandler::Guard &&guard,
const search::attribute::AttributeHeader &header,
const GidIterator &gidIterator,
MetaDataView metaDataView);
~DocumentMetaStoreSaver() override;
};
} // namespace proton
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