Investigating memory usage of exchange rate conversions in moneta

javamoney.properties

# same behaviour with LAZY
load.ECBCurrentRateProvider.type=NEVER
load.ECBHistoric90RateProvider.type=NEVER
load.ECBHistoricRateProvider.type=NEVER
load.IMFRateProvider.type=NEVER

# try to disable default conversions
conversion.default-chain=IDENT

output.txt

Oct 28, 2016 10:00:03 PM org.javamoney.moneta.internal.loader.LoadRemoteDataLoaderService execute
INFO: The exchange rate with resourceId IMFHistoricRateProvider was started remotely
Oct 28, 2016 10:00:03 PM org.javamoney.moneta.internal.loader.LoadRemoteDataLoaderService execute
INFO: The exchange rate with resourceId ECBHistoric90RateProvider was started remotely
Oct 28, 2016 10:00:03 PM org.javamoney.moneta.internal.loader.LoadRemoteDataLoaderService execute
INFO: The exchange rate with resourceId IMFRateProvider was started remotely
Oct 28, 2016 10:00:03 PM org.javamoney.moneta.internal.loader.LoadRemoteDataLoaderService execute
INFO: The exchange rate with resourceId ECBCurrentRateProvider was started remotely
Oct 28, 2016 10:00:03 PM org.javamoney.moneta.internal.convert.ECBAbstractRateProvider newDataLoaded
INFO: Loaded ECBCurrentRateProvider exchange rates for days:1
Oct 28, 2016 10:00:03 PM org.javamoney.moneta.DefaultMonetaryContextFactory createMonetaryContextNonNullConfig
INFO: Using custom MathContext: precision=256, roundingMode=HALF_EVEN
EUR 1
Oct 28, 2016 10:00:03 PM org.javamoney.moneta.internal.convert.ECBAbstractRateProvider newDataLoaded
INFO: Loaded ECBHistoric90RateProvider exchange rates for days:63
Oct 28, 2016 10:00:08 PM org.javamoney.moneta.internal.convert.ECBAbstractRateProvider newDataLoaded
INFO: Loaded ECBHistoricRateProvider exchange rates for days:4358

TestConversions.java

import org.javamoney.moneta.Money;

import javax.money.MonetaryAmount;
import javax.money.convert.CurrencyConversion;
import javax.money.convert.MonetaryConversions;
import java.math.BigDecimal;

public class TestConversions {
    public static void main(String[] args) throws InterruptedException {

        CurrencyConversion toEuro = MonetaryConversions.getConversion("EUR");
        MonetaryAmount oneEuroInEuro = toEuro.apply(Money.of(BigDecimal.ONE, "EUR"));

        System.out.println(oneEuroInEuro);

        // Wait a bit, then acquire a heap dump using eclipse memory analyzer
        // See that ECBHistoricRateProvider is using > 70MB

        while (true) {
            Thread.sleep(1000);
        }
    }
}