CronTrigger在指定时间没有触发,而是在错误的时间发送多个推送通知

时间:2015-07-12 17:00:01

标签: java spring-mvc amazon-web-services cron push-notification

我在Spring MVC 4项目中使用Amazon Push Notifications。我已经使用CronTrigger每天早上8点向Android应用发送推送通知。我还使用了Timezone和CronTrigger,以便用户根据各自的时区获得通知。

这是我的 WebConfig.java:

@Configuration
@EnableScheduling
@EnableWebMvc
@ComponentScan(basePackages="com.project")
public class WebConfig implements SchedulingConfigurer 
{    
    protected static final Logger slf4jLogger  =  Logger.getLogger(WebConfig.class.getName());
private static final String cronExpression = "0 8 * * * ?";



/*@Bean
public MobileNotifSchedulerBean schedulerbean()
{
    return new MobileNotifSchedulerBean();
}*/

@Bean
public InternalResourceViewResolver getInternalResourceViewResolver()
{
    InternalResourceViewResolver resolver = new InternalResourceViewResolver();
    resolver.setPrefix("/WEB-INF/jsp/");
    resolver.setSuffix(".jsp");
    resolver.setSuffix(".html");
    resolver.setSuffix(".htm");
    return resolver;
}

@Bean
CronTrigger cronTrigger() 
{
  //The code in FetchUserTimeZones.java fetches all the user timezones which are stored in DynamoDb. Eg timeZone = "Asia/Calcutta";
   String timeZone = null;
    HashSet<String> userTimeZonesfromDB = FetchUserTimeZones.fetchUserTimeZone();
    for (String s : userTimeZonesfromDB) 
    {
        timeZone = s;
        slf4jLogger.info(s);
    }
    return new CronTrigger(cronExpression, TimeZone.getTimeZone(timeZone));
}


@Override
public void configureTasks(ScheduledTaskRegistrar taskRegistrar) 
{

    taskRegistrar.addCronTask(new CronTask(new MobileNotifSchedulerBean(), cronTrigger()));
}

@Bean(destroyMethod="shutdown")
public Executor taskExecutor() 
{
    return Executors.newScheduledThreadPool(1);
  } 
}

这是我的 MobileNotifSchedulerBean: 此代码从DynamoDb中获取随机问题,并在CronTrigger设置为time(8am)的帮助下,在每个GCM registrationID的推送通知中发送它们。我使用了来自http://docs.aws.amazon.com/sns/latest/dg/mobile-push-gcm.html snsmobilepush.zip

@EnableScheduling
public class MobileNotifSchedulerBean implements Runnable 
{
   protected static final Logger slf4jLogger  = Logger.getLogger(MobileNotifSchedulerBean.class.getName());

public MobileNotifSchedulerBean()
{
     run();
}

public void sendQuestionNotif() 
{
    try 
    {
        HashSet<String> reg_ids = FetchRegistrationIDs.fetchItems();
        for (String s : reg_ids) 
        {
            String REGISTRATION_IDs = s;
            slf4jLogger.info(s);                
            MobileSNSPushNotification.sendNotification(REGISTRATION_IDs);
        }
    } 
    catch (IOException e) 
    {
        //e.printStackTrace();
        slf4jLogger.error(e);
        slf4jLogger.error(e.getMessage());
        slf4jLogger.error(e.getStackTrace());
    }
}


@Override
public void run() 
{
    sendQuestionNotif();
}
}

请在我出错的地方帮助我。唯一的问题是推送通知在错误的时间进行,并且还有多个通知,而不是每个用户每天只进行1次推送通知(上午8点)。  TIA。

更新: Cron Expression有一个更正。我纠正了。

private static final String cronExpression = "0 0 8 * * ?";  // For everyday 8 am. 

但问题还没有解决

1 个答案:

答案 0 :(得分:1)

您应该为每个用户创建单独的计划

// spring bean 
class Task implements Runnable {

    public Task(TaskScheduler scheduler, String cron) {
        HashSet<String> userTimeZonesfromDB = FetchUserTimeZones.fetchUserTimeZone();
        for (String tz : userTimeZonesfromDB) {
            scheduler.schedule(this, new CronTrigger(cron, TimeZone.getTimeZone(tz)));
        }
    }

    @Override
    public void run() {
        // notify
    }
}