使用Schedule Expression参数化EJB调度程序 [英] Parameterize EJB scheduler with Schedule Expression

问题描述

我正在使用EJB 3.1和jboss-eap-6.4，我想为ejb调度程序的小时，分​​钟和秒钟设置一些动态参数，如下所示：

非参数代码 - 每5分钟运行30秒;

  @Singleton 
 @Startup 
 public class TriggerJob {
 @EJB 
 //一些db注入
 
 @PostConstruct 
 public void onStartup（）{
尝试{
 prepare（）; 
} catch（CertificateVerificationException e）{
 e.printStackTrace（）; 
} 
} 
 
 @Schedule（second =30，minute =* / 5，hour =*，persistent = false）
 public void prepare（）{
 //我的预定任务
} 
} 
  

上述代码正常执行。

动态参数代码 - 每5分钟30秒钟运行一次

  @Singleton 
 @Startup 
 public class TriggerJob {
 
 @EJB 
 // some injections 
 
 private boolean runningFlag = false; 
 
 @Resource 
 private TimerService timerService; 
 
 public void setTimerService（TimerService timerService）{
 this.timerService = timerService; 
} 
 
 @Timeout 
 public void timerTimeout（）{
 try {
 prepare（）; 
} catch（CertificateVerificationException e）{
 e.printStackTrace（）; 
 $ 
 
 
 private void postCunstruct（） at，false）; 
} 
 
 private ScheduleExpression createSchedule（）{
 ScheduleExpression expression = new ScheduleExpression（）; 
 expression.hour（*）
 .minute（* / 5）
 .second（30）; 
返回表达式; 
} 
 
 public void prepare（）{
 //我的预定任务
} 
} 
  / pre> 
 
 
上述代码无法正常执行，通常它会在一秒钟内执行多次。
 
 
 
另外，我已经阅读了其他一些不帮助我的问题：
 
 
 
  EJB 3.x中@Schedule方法的动态参数 
 
 
 
 使用定时服务 -  Java EE 6教程 
 
 
 
任何帮助将不胜感激。
解决方案
相反，使用编程调度， exmaple：
  @Singleton 
 @Startup 
 public class TriggerJob {
 
 @EJB 
 //一些注入
 
 @Resource 
 private TimerService ti merService; 
 
 @PostConstruct 
 public void init（）{
 createTimer（）; 
 //以下代码解决我的启动问题
 try {
 prepare（）; 
} catch（CertificateVerificationException e）{
 e.printStackTrace（）; 
} 
} 
 
 @Timeout 
 public void timerTimeout（）{
 try {
 prepare（）; 
} catch（CertificateVerificationException e）{
 e.printStackTrace（）; 
} 
} 
 
 private void createTimer（）{
 ScheduleExpression scheduleExpression = new ScheduleExpression（）; 
 scheduleExpression.second（30）。minute（* / 5）。hour（*）; 
 TimerConfig timerConfig = new TimerConfig（）; 
 timerConfig.setPersistent（false）; 
 timerService.createCalendarTimer（scheduleExpression，timerConfig）; 
} 
 
 public void prepare（）{
 //我的预定任务
} 
} 
  / pre> 
I am using EJB 3.1 and jboss-eap-6.4 and I want to set some dynamic parameters for hour, minute and second of ejb scheduler as follows:

Non-parametric code - which run in 30th second of every 5 minutes :
@Singleton
@Startup
public class TriggerJob {
    @EJB
   //some db injections           

    @PostConstruct
    public void onStartup() {
        try {
            preparation();
        } catch (CertificateVerificationException e) {
            e.printStackTrace();
        }
    }

    @Schedule(second = "30", minute = "*/5", hour = "*", persistent = false)
    public void preparation() {
    //my scheduled tasks
    }
}
The above code executes properly.

Dynamic Parametric code - which should run in 30th second of every 5 minutes:
@Singleton
@Startup
public class TriggerJob {

    @EJB
    //some injections

    private boolean runningFlag = false;

    @Resource
    private TimerService timerService;

    public void setTimerService(TimerService timerService) {
        this.timerService = timerService;
    }

    @Timeout
    public void timerTimeout() {
        try {
            preparation();
        } catch (CertificateVerificationException e) {
            e.printStackTrace();
        }
    }

    @PostConstruct
    private void postCunstruct() {
        timerService.createCalendarTimer(createSchedule(),new TimerConfig("EJB timer service timeout at ",false));
    }

    private ScheduleExpression createSchedule() {
        ScheduleExpression expression = new ScheduleExpression();
        expression.hour("*")
                .minute("*/5")
                .second("30");
        return expression;
    }

    public void preparation(){
    // my scheduled tasks
    }
}
The above code does not execute correctly, usually it executes multiple times at a second.

Also, I have read some other questions which did not help me:

Dynamic parameters for @Schedule method in an EJB 3.x

Using the Timer Service - The Java EE 6 Tutorial

Any help would be appreciated.
解决方案
Instead, use programmatic scheduling, here is an exmaple :
@Singleton
@Startup
public class TriggerJob{

    @EJB
    //some injections

    @Resource
    private TimerService timerService;

    @PostConstruct
    public void init() {
        createTimer();
        //the following code resolve my startup problem
        try {
        preparation();
        } catch (CertificateVerificationException e) {
            e.printStackTrace();
        }
    }

    @Timeout
    public void timerTimeout() {
        try {
        preparation();
        } catch (CertificateVerificationException e) {
        e.printStackTrace();
        }
    }

    private void createTimer() {
        ScheduleExpression scheduleExpression = new ScheduleExpression();
        scheduleExpression.second("30").minute("*/5").hour("*");
        TimerConfig timerConfig = new TimerConfig();
        timerConfig.setPersistent(false);
        timerService.createCalendarTimer(scheduleExpression, timerConfig);
        }

    public void preparation(){
        // my scheduled tasks
    }
}


                        
这篇关于使用Schedule Expression参数化EJB调度程序的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！