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.
Related
I've got an Async method which is scheduled to run once a day:
#Component
public class MyClass {
//myCronProperty set to "0 25 20 * * *" in application.properties
#Scheduled(cron="{myCronProperty}")
#Async
#Override
public void doDailyTask() {
//Do work here
}
}
Is there a way of triggering doDailyTask() for testing purposes when the application is already running, perhaps by doing something clever with Groovy and reflection?
I figure I can always tweak the cron property to 1 minute in the future in my application.properties file, and then restart the application - but just wondered if there was a smarter method?
You should be able to simply inject the component into another class, for example a #RestController, and invoke the doDailyTask() method on it there.
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 need some help with some design as well as spring scheduler related code. I am trying to write few utility classes, where by all the tasks (which are going to do some async processing) are scheduled at regular intervals.
So, I create a Task class which has a execute() method, which needs to be implemented by each task.
public interface Task
{
void execute();
}
public class TaskOne implements Task
{
#Override
public void execute()
{
// do something
}
}
public class TaskTwo implements Task
{
#Override
public void execute()
{
// do something
}
}
#Component
public class ScheduledTasks
{
#Scheduled(fixedRate = 5000)
public void runTask()
{
Task taskOne = new TaskOne();
taskOne.execute();
Task taskTwo = new TaskTwo();
taskTwo.execute();
}
}
I need to run different tasks at different interval, which I want to be configurable without the need of restarting the server. By this, I mean that time specified here can be changed without a restart.
#Scheduled(fixedRate = configurable, with some initial value)
Normally, what is the best way of doing this ?
One approach I can think of is:
1. Keep the trigger (periodic or cron) for each task in db
2. Load these triggers at the time of start up
3. Somehow, annotate the execute() methods with the proper value. This is going to be technically stiff.
4. If we want to change the job interval timing, update the db and refresh the caches.
Also, if some one can share some code snippet or suggest something like a small library, that would be highly appreciated. Thanks.
For configuration you don't need ScheduledTasks. Instead, you can annotate every task as #Component and annotate execute method with #Scheduled.
#Componenet
public class TaskOne implements Task
{
#Override
#Scheduled(...)
public void execute()
{
// do something
}
}
As far as updating this question. You'll have to figure out how to differentiate for different tasks.
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
}