时间相关变量的最佳实践

Question

我有一个处理实时事件的系统。用户可以在指定的时间间隔插入自定义事件。实时引擎使用java.time.Duration来计时事件。通过jsp向用户展示一个菜单，该菜单以（全）秒为单位指定Duration。事件列表被序列化为Long值。所以我有三种使用相同值的方法。我创建了一个值对象，在每次访问时执行转换，这样我就不必将转换分散在整个代码中。我想知道是否有更好的方法来完成这个场景。这是我的VO。

import java.time.Duration;

public class PeriodicCommandVO {
    private String id;
    private String command;
    private Duration duration;
    private Long interval;
    private Long frequency;
    private boolean active;
    public String getCommand() {
        return command;
    }
    public void setCommand(String command) {
        this.command = command;
    }
    public Long getInterval() {
        if (interval == null) {
            if (duration != null) interval = duration.toMillis();
            else {
                if (frequency != null) interval = frequency*1000;
            }
        }
        return interval;
    }
    public void setInterval(Long interval) {
        this.interval = interval;
        this.duration = Duration.ofMillis(interval);
        this.frequency = (interval+500)/1000;
    }
    public Duration getDuration() {
        if (duration == null) {
            if (interval != null) duration = Duration.ofMillis(interval);
            else {
                if (frequency != null) duration = Duration.ofMillis(frequency*1000);
            }
        }
        return duration;
    }
    public void setDuration(Duration duration) {
        this.duration = duration;
        this.interval = duration.toMillis();
        this.frequency = (interval+500)/1000;
    }
    public Long getFrequency() {
        if (frequency == null) {
            if (duration != null) frequency = (duration.toMillis()+500)/1000;
            else {
                if (interval != null) frequency = (interval+500)/1000;
            }
        }
        return frequency;
    }
    public void setFrequency(Long frequency) {
        this.frequency = frequency;
        this.interval = frequency*1000;
        this.duration = Duration.ofSeconds(frequency);
    }
    public boolean isActive() {
        return active;
    }
    public void setActive(boolean active) {
        this.active = active;
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
}

Answer 1

将转换逻辑移到表单中，以便JSP可以看到需要更新的变量。对VO使用多个构造函数，并将变量减少为仅存储持续时间（这是最常见的实现）。