QueueingState.java

@Embeddable
public class QueueingState {
  
	public enum Status {
		NOT_ATTEMPTED,
		ERROR,
		SUCCESS
	}

	private Status status;
	private LocalDateTime nextAttemptTime;
	private int attemptCount;
	private LocalDateTime lastAttemptTime;
	private String lastAttemptErrorMessage;

	public QueueingState() {
		this.status = Status.NOT_ATTEMPTED;
		this.attemptCount = 0;
	}