Visitor.java

import lombok.Builder;
import lombok.Data;
import lombok.NonNull;
 
@Data
public class Visitor {
 
    private String visitorId;
    private Integer siteId;
    private Long visitTs;
 
    public Visitor(){}
 
    @Builder
    public Visitor( @NonNull String visitorId, @NonNull Integer siteId, Long visitTs){
        this.visitorId = visitorId;
        this.siteId = siteId;
        this.visitTs = visitTs;
    }
 
}