Compare4Synchronous.java

package test;

public class Compare4Synchronous {
    // data structures
    public class ProfileData {
        public long getUserId() { return 42; }
    }
    public class User {
        public String getEmail() { return null; }
        boolean getNotificationsEnabled() { return false; }
    }

    // I/O operations: blocking, synchronous
    <T> T fetchFromDb(Class<T> entityClass, long id) { return null; }
    void sendEmail(String to, String content) { }
    void sendHttpPost(String url, Object payload) { }

    // the business logic: synchronous, sequence of statements
    String runBusinessProcess(ProfileData profileData) {
        User user = fetchFromDb(User.class, profileData.getUserId());
        if (user != null) {
            sendHttpPost("http://profile_service/post/" + profileData.getUserId(), 
                profileData);
            
            if (user.getNotificationsEnabled()) {
                sendEmail(user.getEmail(), "profile updated");
            }

            return "ok";
        } else {
            return "user not found";
        }
    }
}