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https://github.com/ru-fix/dynamic-property

There is a newer version: 2.0.8

package ru.fix.dynamic.property.api;

import java.util.function.Function;

public class MappedProperty extends AtomicProperty implements DynamicProperty {

    private final PropertySubscription subscription;

    public MappedProperty(DynamicProperty source, Function map) {
        this.subscription = source
                .createSubscription()
                .setAndCallListener((oldValue, newValue) -> this.set(map.apply(newValue)));
    }

    @Override
    public void close() {
        subscription.close();
        super.close();
    }
}