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sirdaiz
Asked: 2020-09-12 00:44:52 +0800 CST 2020-09-12 00:44:52 +0800 CST

Call method automatically

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Suppose I have a rest service

http://localhost:8080/test/api/check

And I want this service to be called once a day, but whoever calls it is the same application, is it possible?

NOTE: I can't use a cron

java

2 Answers

  1. Best Answer

    If it's the same app, you can create a task using Quartz or directly using Spring:

    @Scheduled(cron = "0 15 10 15 * ?")
public void scheduledMethod() {

    // tarea a realizar
}

    For this to work you need to add the corresponding annotation to the Spring configuration:

    @Configuration
@EnableScheduling
public class SpringConfig {
    ...
}

    or if the configuration goes through XML:

    <task:annotation-driven>
    • 2

  2. Particularly and from experience I would not call is to use some scheduler library in java. Above all, when doing this you must take special care not to make an http request. It is not necessary if you make a design to be able to call the same "command" from different endpoints. An example is worth a thousand words:

    
public class Comando{
    public String hacerAlgo(){
        //Haz las operaciones que necesites
    }
}

    The rest endpoint, I haven't used Spring annotations because I don't know if you use it.

    
    @Path("/test/api/check")
    public class EndPoint1{

        private Comando comando;

        @Get
        public String hacerAlgo(){
            //Aquí el codigo para transformar los parametros y validarlos si fuera necesario

            String response = comando. hacerAlgo();

            //Aqui el codigo para transformar la respuesta si fuera necesario
        }
    }

    The creation of quartz, if you use Spring, you have it super easy with the instructions of @Pablo Lozano . As I have assumed that you do not use it, I will give you an example using Quartz Doc quartz . You must make a call to the init method when starting the application, since I do not have information about your system, I cannot give you details.

    
    public class TriggerInit{

        public String init(){

          JobDetail job = newJob(Comando.class)
             .withIdentity("job1", "group1")
                  .build();

          // Aqui tienes como hacer un triger
          Trigger trigger = newTrigger()
              .withIdentity("trigger1", "group1")
              .startNow()
              .withSchedule(cronSchedule("15 0/2 * * * ?"))
              .build();

          // Tell quartz to schedule the job using our trigger
          scheduler.scheduleJob(job, trigger);
        }
    }

    I've also assumed for simplicity that you don't need parameters.

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