Compare1b.java

class Synchronous {
    // I/0 operations: blocking, synchronous
    <T> T fetchFromDb(Class<T> entityClass, long id) { return null; }
    String sendHttpGet(String url) { return null; }
    void sendEmail(String to, String content) { }

    // the business logic: synchronous
    void runBusinessProcess() {
        User user = fetchFromDb(User.class, 42);
        String profile = sendHttpGet(
            "http://profile_service/get/" + user.getProfileId());
        sendEmail(user.getEmail(), "Your profile is: " + profile);
    }
}