********** @Schedule Cron jobs in spring boot

three types of scheduling

1. Fixed rate
2. Fixed Delay
3. Cron : most important job

--- Need to describe the configuration class with @EnableScheduling annotation and @Configuration annotation this config class can be empty

sytax: @Configuration @EnableScheduling public class Class_Name(SchedulingConfig:usually){

   }

--- add @Component class with Logs and other tasks to perform make sure access modifiers are public and return types are void if not it will just skip the results

syntax: @Component
public class FixedRate_Class{ @Scheduled(fixedRate=5000){ task stmts; } }

--- for corn jobs we have to annotate the methods from component class with @Scheduled annotation this annotation takes the argument like the bash cron syntax need to specify into "" colons

like : @Scheduled(cron ="*/5 * * * *") public void task(){ stmts; }

syntax for cron string :

0*/2*** 0= Second (0th second of the minute) */2 =Minutes (Every two minutes)

• = Hours (Every hour)
• = Day of Month (Every Day of the month)
• = month (Every month) ? = Day of the week (any day of the week)

** for the above execution spring will start with single thread execution only

If want to execute these tasks concurrently :

1. specify the thread Scheduler configurations

Syntax:

@Configuration public class threadSchedularConfiguration{

@Bean public TaskScheduler taskScheduler(){

  ThreadPoolTaskScheduler taskscheduler = new ThreadPoolTaskSchduler();
  taskscheduler.setPoolSize(10);
  taskscheduler.setThreadName("Scheduled-Task-");
  return taskscheduler;

} }