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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 <vespa/vespalib/util/gencnt.h>
#include "service_mapping.h"
namespace slobrok {
/**
* represents an incremental update to a name->spec map,
* or optionally a full dump of it.
**/
struct MapDiff {
/** construct incremental diff */
MapDiff(const vespalib::GenCnt &from,
std::vector<vespalib::string> remove,
ServiceMappingList update,
const vespalib::GenCnt &to)
: fromGen(from),
removed(std::move(remove)),
updated(std::move(update)),
toGen(to)
{}
/** construct full map dump */
MapDiff(ServiceMappingList mappings,
const vespalib::GenCnt &to)
: MapDiff(0, {}, std::move(mappings), to)
{}
MapDiff(MapDiff &&) noexcept;
~MapDiff();
// is this a diff from the empty map:
bool is_full_dump() const { return fromGen == vespalib::GenCnt(0); }
// which generation this diff goes from:
vespalib::GenCnt fromGen;
// names to remove (empty if is_full_dump):
std::vector<vespalib::string> removed;
// name->spec pairs to add or update:
ServiceMappingList updated;
// which generation this diff brings you to:
vespalib::GenCnt toGen;
};
} // namespace slobrok
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