What is the Best approach to run a long process using Spring

Question

I would like to ask what is the best approach to run a long process using Spring. I have a webapp and when the client does a request it runs a Spring controller. This Controller would get some parameters from the request and then runs a query and fetch records from the DB.

The records from the DB are high, i need to do a comparing logic which may take a long time, so I need to run it separately. When this process is executed , it should write the final results into an excel file and mail it.

Answer 1

You can use the annotation @Async to return immediately.

Fisrt, write a @Service class to process you DB and Excel job.

@Service
public class AccountService {
    @Async
    public void executeTask(){
    // DB and Excel job
    }
}

Then, In controller method trigger the task

@Controller
public class taskController{
    @RequestMapping(value = "as")
    @ResponseBody
    public ResultInfo async() throws Exception{
        accountService.executeTask();
        return new ResultInfo(0, "success", null);
    }
}

At last, add this to application-context.xml(spring config file)

<task:annotation-driven executor="taskExecutor"/>
<task:executor id="taskExecutor" pool-size="10"/>

Hope this will help you.