Approach 1: Static methods

The profile fetcher has a static method
Before calculating trades, our tool will call the static method to fetch your profile

public class TradeCalculator {
    public static Something calculateTrades(String userId) {
        ProfileData data = ProfileFetcher.fetchProfile(userId)
        // Do math !
    }
}

public class ProfileFetcher {
    public static ProfileData fetchProfile(String userId) {
        // Complex SQL?
        return userProfile;
    }
}

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