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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* Helper class to represent the redundancy arrays from config, dividing
* copies between groups, like 2|1|*.
*
* All asterisk entries must be given last. There must be an asterisk in the end.
*/
#pragma once
#include <vespa/document/util/printable.h>
#include <vector>
#include <vespa/vespalib/stllike/string.h>
namespace storage::lib {
class RedundancyGroupDistribution : public document::Printable {
std::vector<uint16_t> _values;
public:
RedundancyGroupDistribution() noexcept {}
/**
* Create a group distribution spec from the serialized version.
* Asterisk entries are represented as zero.
*/
RedundancyGroupDistribution(vespalib::stringref serialized);
/**
* Create a group distribution for a given redundancy. Will fail if there
* are no asterisk entries in spec. Should prefer to use every copy before
* allowing more copies for one group.
*/
RedundancyGroupDistribution(const RedundancyGroupDistribution& spec,
uint16_t redundancy);
~RedundancyGroupDistribution() override;
uint16_t size() const { return _values.size(); }
uint16_t operator[](uint16_t i) const { return _values[i]; }
bool operator==(const RedundancyGroupDistribution& o) const
{ return (_values == o._values); }
void print(std::ostream&, bool verbose, const std::string& indent) const override;
private:
uint16_t getFirstAsteriskIndex() const;
uint16_t divideSpecifiedCopies(
uint16_t start, uint16_t end,
uint16_t redundancy, const std::vector<uint16_t>& maxValues);
};
}
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