Spring integration trigger timer events [closed] - spring

Question

Closed. This question is opinion-based. It is not currently accepting answers.
Want to improve this question? Update the question so it can be answered with facts and citations by editing this post.
Closed 3 years ago.
Improve this question
I am still new to Spring Integration so please bear with me.
I have a use case where for each event received we have to create a set of timers that will be executed when it reaches that time frame. I am looking into Delayer but not sure if it will satisfy the above condition
Say for example when we receive a schedule event for a flight we will process, persist as per the business logic and will create 2 timers for the flight that will be executed after an hour. So when the clock reaches that hour mark it will perform some defined action.
I am thinking of "delayer" with a persistent message store but not sure if it is scalable for a huge load of 20k timers at a given time.
For debugging purposes I would also like to see the history of timer that are successfully executed and the details of the timer.
Please recommend a good approach.

Answer 1

If I understood correctly : You are looking for Event based Dynamic Schedulers.
You can use REST (Event) & Quartz schedulers (Scheduling). Upon hitting URL localhost/schedule it will schedule the event as per the time give in your REST request.
Refer to below code sample
import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.scheduling.quartz.SchedulerFactoryBean;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.restro.jobs.request.ScheduleJobsRequest;
import com.restro.jobs.service.SchedulerService;
#Controller
public class JobsScheduleController implements ApplicationContextAware{
#Autowired
SchedulerService service;
#Autowired
SchedulerFactoryBean schedulerFactoryBean;
ApplicationContext applicationContext;
#RequestMapping(value = "/schedule", method = RequestMethod.POST, produces = { "application/json" })
public #ResponseBody void schedule(#RequestBody ScheduleJobsRequest scheduleJobsRequest)
throws JsonProcessingException, ClassNotFoundException, SchedulerException {
Scheduler scheduler = schedulerFactoryBean.getScheduler();
scheduler.getContext().put("applicationContext", applicationContext);
service.scheduleJobs(scheduleJobsRequest.getJobName(), scheduleJobsRequest.getGroup(),
scheduleJobsRequest.getCronExpression(), scheduler);
System.out.println("scheduled");
}
#Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
}
Sample REST Scheduling request
{
"jobName":"OrderOneSettlementJob",
"group":"order",
"cronExpression":"0/30 * * * * ?"
}