f2ade71f4f
This patch adds a public static get_units function to wcu_consumed_capacity_counter. It will be used by the batch write item implementation, which cannot use the wcu_consumed_capacity_counter directly. Signed-off-by: Amnon Heiman <amnon@scylladb.com> consume_capacity need merge
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
/*
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* Copyright 2024-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include "utils/rjson.hh"
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namespace alternator {
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/**
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* \brief consumed_capacity_counter is a base class that holds the bookkeeping
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* to calculate RCU and WCU
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*
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* DynamoDB counts read capacity in half-integers - a short
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* eventually-consistent read is counted as 0.5 unit.
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* Because we want our counter to be an integer, we counts half units in
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* our internal calculations.
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*
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* We use consumed_capacity_counter for calculation of a specific action
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*
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* It is also used to update the response if needed.
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*/
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class consumed_capacity_counter {
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public:
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consumed_capacity_counter() = default;
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consumed_capacity_counter(bool should_add_to_reponse) : _should_add_to_reponse(should_add_to_reponse){}
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bool operator()() const noexcept {
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return _should_add_to_reponse;
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}
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consumed_capacity_counter& operator +=(uint64_t bytes);
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double get_consumed_capacity_units() const noexcept;
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void add_consumed_capacity_to_response_if_needed(rjson::value& response) const noexcept;
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virtual ~consumed_capacity_counter() = default;
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/**
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* \brief get_half_units calculate the half units from the total bytes based on the type of the request
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*/
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virtual uint64_t get_half_units() const noexcept = 0;
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uint64_t _total_bytes = 0;
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static bool should_add_capacity(const rjson::value& request);
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protected:
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bool _should_add_to_reponse = false;
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};
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class rcu_consumed_capacity_counter : public consumed_capacity_counter {
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bool _is_quorum = false;
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public:
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rcu_consumed_capacity_counter(const rjson::value& request, bool is_quorum);
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rcu_consumed_capacity_counter(): consumed_capacity_counter(false), _is_quorum(false){}
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virtual uint64_t get_half_units() const noexcept;
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static uint64_t get_half_units(uint64_t total_bytes, bool is_quorum) noexcept;
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};
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class wcu_consumed_capacity_counter : public consumed_capacity_counter {
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virtual uint64_t get_half_units() const noexcept;
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public:
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wcu_consumed_capacity_counter(const rjson::value& request);
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static uint64_t get_units(uint64_t total_bytes) noexcept;
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};
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}
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