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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 "i_document_retriever.h"
#include <vespa/searchlib/common/idocumentmetastore.h>
#include <vespa/persistence/spi/bucket.h>
#include <vespa/persistence/spi/selection.h>
#include <vespa/persistence/spi/result.h>
#include <vespa/persistence/spi/read_consistency.h>
#include <vespa/document/fieldset/fieldset.h>
namespace proton {
class DocumentIterator
{
private:
using ReadConsistency = storage::spi::ReadConsistency;
const storage::spi::Bucket _bucket;;
const storage::spi::Selection _selection;
const storage::spi::IncludedVersions _versions;
const document::FieldSet::SP _fields;
const ssize_t _defaultSerializedSize;
const ReadConsistency _readConsistency;
const bool _metaOnly;
const bool _ignoreMaxBytes;
bool _fetchedData;
std::vector<IDocumentRetriever::SP> _sources;
size_t _nextItem;
storage::spi::IterateResult::List _list;
bool checkMeta(const search::DocumentMetaData &meta) const;
void fetchCompleteSource(const IDocumentRetriever & source, storage::spi::IterateResult::List & list);
bool isWeakRead() const { return _readConsistency == ReadConsistency::WEAK; }
public:
DocumentIterator(const storage::spi::Bucket &bucket, document::FieldSet::SP fields,
const storage::spi::Selection &selection, storage::spi::IncludedVersions versions,
ssize_t defaultSerializedSize, bool ignoreMaxBytes,
ReadConsistency readConsistency=ReadConsistency::STRONG);
~DocumentIterator();
void add(IDocumentRetriever::SP retriever);
storage::spi::IterateResult iterate(size_t maxBytes);
};
} // namespace proton
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