I am scheduling tasks with Spring, and the following code works well.
#Component
public class ScheduledTasks {
#Scheduled(fixedRateString = "${rateInMillisecond}")
public void update()
{
System.out.println(this.message);
}
}
Now, if I config rate in minute, for example having
rateInMinute=30
in my application.properties, is there a way to use this property to set scheduling rate?
30 minutes is 1,800,000 (i.e. 30 * 60 * 1000) milliseconds. So the question is how to set fixedRate or fixedRateString based on calculation based on a property?
Thanks to Noah, this solves it:
#Scheduled(fixedRateString = "#{${rateInMinute} * 60000}")
Related
In Spring-boot project, is there a method that want to make it called every seconds automatically?
And make an rest-api to set calling term in same project?
Here comes an example.
The greeting method will be executed every 5 seconds and it can be called when you visit /hello endpoint.
#SpringBootApplication
#EnableScheduling
#RestController
public class So47301079 {
public static void main(String[] args) {
SpringApplication.run(So47301079.class, args);
}
#Scheduled(fixedRate = 5000)
#GetMapping(value="/hello")
public void greeting() {
System.out.println("Hello!!!");
}
}
Hope this helps you!
Can use cron expression like #Scheduled(cron="*/5 * * * * *"). In this way, we have a control on minutes, hours, days also. Have a look at this video to know different possible ways to use cron expression.
I am using spring-schedule like this.
#Component
#EnableScheduling
public class ScheduledTasks {
#Autowired
private ISomeJob someJob;
/**
* do a Job every 5 minutes.
*/
#Scheduled(cron = "0 0/5 * * * ?")
public void foo(){
someJob.doSomething();
}
}
It worked. But there is a problem.
I have two profiles named debug and release.
I want do this job every 5 minutes in debug but per hour in release.
So is there any way to config the value of cron in application.properties.
Just add an expression #Scheduled(cron = "${some.profile.cron}") to swap the cron depending on selected profile.
package com.test.cron;
#Service
public class CronJob {
protected static final Logger logger = Logger.getLogger(CronJob.class);
#Scheduled(cron="0 0 23 * * *")
public void demoServiceMethod()
{
logger.debug("Cron job started.");
}
}
Cron excution time will be often changed.
I have to exchange '#Scheduled' annotation to java code.
You can externalize this cron value into a properties file.
#Scheduled(cron="${schedularTime}")
and in your properties file ( example: application-dev.properties)
schedularTime=0 0/2 * * * ?
Old thread, but there is no real answer to the question.
Here is a way to schedule jobs without any annotations.
The example is in Kotlin, but works the same way in java.
#Component
class CliRunner(
private val scheduler: ThreadPoolTaskScheduler,
private val scheduledService: ScheduledService
) : CommandLineRunner {
override fun run(vararg args: String) {
scheduler.scheduleAtFixedRate(scheduledService::run, 10_000)
}
}
Inject ThreadPoolTaskScheduler and whatever you want to schedule, and call any of the scheduling methods on the scheduler.
My example schedules the run method to be executed every 10 seconds.
You could use a database for the configuration of schedule, Quartz had a capability to save its job meta data in a datasource.
Somebody had implemented something like this here.
https://github.com/davidkiss/spring-boot-quartz-demo
Hello i working on a cron job and would like to schedule the task to run once every two weeks on a Monday morning using #schedule in spring can anyone help me out here?
You should check out the getting started examples in the spring.io website:
Scheduling Tasks
For your use case you'll be using the scheduled annotation with a cron expression:
#Scheduled(cron=". . .")
This uses the CronSequenceGenerator.
As the other answer mentioned you just have to add the #Scheduled annotation. however if using spring boot dont forget to add this anotation #EnableScheduling in the main class of your app
#EnableScheduling
#EnableAutoConfiguration
public class MyApplication {
Hope it helps
If you use not springboot but spring framework, you can configure scheduling job like below.
#EnableScheduling
#Configuration
public class SchedulingConfig {
// ...
}
And use like this.
private static final int TEN_MINUTES = 60 * 10 * 1000;
#Scheduled(fixedRate = TEN_MINUTES)
public void doSomething() {
// ...
}
Regarding the cron expression for every two weeks, here're some discussion.
It seems not very convenient to use cron expression to set two weeks schedule. Instead, you can use cron expression to set weekly tasks, and use a boolean variable to flip the boolean value:
boolean flag;
// run the method at 8:00 AM every Monday
#Scheduled(cron="0 0 8 * * MON")
public void schedulingTask() {
// run the actual task only if flag is true
if (flag) {
// handle the biweekly task
}
// flip the flag
flag = !flag;
}
I want to schedule a method call in Spring MVC to run after every two hours. This I can easily do via Spring 3.0 Time Scheduler. However, I want to kick the execution off only at a specific time of the day. That is, the method should only be invoked every 2 hours starting at a particular time.
For example - I want the method to run every 2 hours starting 6 AM.
The TimeScheduler interface has a scheduleAtFixedRate method which is overloaded to use startTime Date argument. I am not really sure how to use this.
Any idea how this can be achieved ?
You could take a look at the TaskScheduler interface. It provides a method scheduleAtFixedRate(Runnable task, Date startTime, long period) which returns a ScheduledFuture. You can use this with some simple Spring configuration:
<task:scheduler id="scheduler" pool-size="10"/>
This will create an instance of ThreadPoolTaskScheduler which implements TaskScheduler. Wire this bad boy into the class to call your specific method:
public class MyClass {
#Autowired
private TaskScheduler scheduler;
public void init() {
scheduler.scheduleAtFixedRate(new Runnable() {
public void run() {
myMethod();
}
}, new Date(), 1000 * 60 * 60 * 2); //This will start now and run every two hours
}
public void myMethod() {
// the method you want to invoke
}
}
I would take a look at Spring's support for Task Execution and Scheduling. Specifically check out the #Scheduled annotation (with which you can specify a schedule based on a cron expression):
#Scheduled(cron="*/5 * * * * MON-FRI")
public void doSomething() {
// something that should execute on weekdays only
}