java - EJB 3.x 中@Schedule 方法的动态参数

Question

我是 J2EE6 中 @Schedule 注释的新手

我想使用 EJB 3.x 和 Glassfish 3.1 运行作业。

javax.ejb.Schedule 对我们来说似乎是一个不错的选择，所以我们可以将自定义时间想象成这样:

@Singleton
public class CustomTimer {
    @EJB
    SettingsFacade settingsFacade;

    @Schedule(second="someSecondParameter", minute="someMinuteParameter",hour="someHourParameter", persistent=false)
    public void executeTimer(){
        //Code executing something against database using the settingsFacade
    }
}

在这里，我们希望从数据库中获取参数，因此每个月都会更改。有什么干净的解决方案吗？

Answer 1

@Singleton@Startuppublic class ScheduleTimerService {    @Resource private TimerService timerService;    public void setTimerService(TimerService timerService) {this.timerService = timerService; }    @PostConstruct    private void postConstruct() {        timerService.createCalendarTimer(createSchedule());    }    @Timeout    public void timerTimeout(Timer timer) {           Add your code here to be called when scheduling is reached...           in this example: 01h:30m every day ;-)    }    private ScheduleExpression createSchedule(){        ScheduleExpression expression = new ScheduleExpression();        expression.dayOfWeek("Sun,Mon,Tue,Wed,Thu,Fri,Sat");            expression.hour("01");        expression.minute("30");        return expression;    }}