solana-runtime 4.0.0-beta.7

Solana runtime
Documentation 
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use {
    solana_clock::Epoch,
    solana_epoch_schedule::EpochSchedule,
    solana_genesis_config::GenesisConfig,
    solana_rent::{DEFAULT_BURN_PERCENT, Rent},
};

#[cfg_attr(feature = "frozen-abi", derive(solana_frozen_abi_macro::AbiExample))]
#[derive(Clone, Debug, PartialEq, serde::Deserialize, serde::Serialize)]
pub struct RentCollector {
    pub epoch: Epoch,
    pub epoch_schedule: EpochSchedule,
    pub slots_per_year: f64,
    pub rent: Rent,
}

impl Default for RentCollector {
    fn default() -> Self {
        Self {
            epoch: Epoch::default(),
            epoch_schedule: EpochSchedule::default(),
            // derive default value using GenesisConfig::default()
            slots_per_year: GenesisConfig::default().slots_per_year(),
            rent: Rent::default(),
        }
    }
}

impl RentCollector {
    pub(crate) fn new(
        epoch: Epoch,
        epoch_schedule: EpochSchedule,
        slots_per_year: f64,
        rent: Rent,
    ) -> Self {
        Self {
            epoch,
            epoch_schedule,
            slots_per_year,
            rent,
        }
    }

    pub(crate) fn clone_with_epoch(&self, epoch: Epoch) -> Self {
        Self {
            epoch,
            ..self.clone()
        }
    }

    pub(crate) fn deprecate_rent_exemption_threshold(&mut self) {
        self.rent = Rent {
            lamports_per_byte_year: (self.rent.lamports_per_byte_year as f64
                * self.rent.exemption_threshold) as u64,
            exemption_threshold: 1.0,
            burn_percent: DEFAULT_BURN_PERCENT,
        }
    }
}