Spring Boot + @EnableScheduling + @Scheduled + Scheduled Tasks
Spring boot provides excellent features for both task scheduling and asynchronous method execution based on cron expression using @Scheduled annotation. The @Scheduled annotation can be added to a method along with trigger metadata.
In this example, we will learn how to use @Scheduled annotation in 4 different ways.
Table Of Contents
- Technology Stack
- Project Structure
- Spring Boot @EnableScheduling and @Scheduled Annotations
- Maven File (pom.xml)
- SchedulerConfig
- Example: Scheduled Task with Cron Expression
- Example: Scheduled Task with fixedRate
- Example: Scheduled Task with fixedDelay
- Example: Scheduled Task with fixedRate and initialDelay
- Example: Scheduled Tasks with all 4 ways
- Example: Running Parallel Tasks (@Async)
- Download Source Code (Attached)
Technology Stack
Java 8
Maven 3.5.0
Spring Boot 2.4.4
Red Hat JBoss Developer Studio 11.3.0.GA / EclipseProject Structure
High level project structure would be like this.
Spring Boot @EnableScheduling and @Scheduled Annotations
@EnableScheduling and @Scheduled annotations need to be added for Scheduling tasks in Spring Boot Application.
@EnableScheduling should be applied to the SpringBootApplication.
package com.the.basic.tech.info.app;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
@SpringBootApplication
@EnableScheduling
public class SchedulerDemoApplication {
public static void main(String[] args) {
SpringApplication.run(SchedulerDemoApplication.class, args);
}
}@Scheduled must be applied on any method but that method should not take any arguments and should not return any value hence void should be return type.
package com.the.basic.tech.info.app;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.TimeUnit;
@Component
public class ScheduledTasks {
private static final Logger logger = LoggerFactory.getLogger(ScheduledTasks.class);
private static final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("HH:mm:ss");
@Scheduled(cron = "0 * * * * ?")
public void scheduleTaskWithCronExpression() {
logger.info("Cron Task :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()));
}
}
Maven File (pom.xml)
pom.xml mavel file contains all the maven dependency details.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>spring-boot-scheduler</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring-boot-scheduler</name>
<description>Spring Boot microservice project for scheduler</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.4</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-runner</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
SchedulerConfig
SchedulingConfigurer functional interface needs to be implement for overriding the configureTasks method.
package com.the.basic.tech.info.app.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;
@Configuration
public class SchedulerConfig implements SchedulingConfigurer {
private final int POOL_SIZE = 10;
@Override
public void configureTasks(ScheduledTaskRegistrar scheduledTaskRegistrar) {
ThreadPoolTaskScheduler threadPoolTaskScheduler = new ThreadPoolTaskScheduler();
threadPoolTaskScheduler.setPoolSize(POOL_SIZE);
threadPoolTaskScheduler.setThreadNamePrefix("my-scheduled-task-pool-");
threadPoolTaskScheduler.initialize();
scheduledTaskRegistrar.setTaskScheduler(threadPoolTaskScheduler);
}
}Example: Scheduled Task with Cron Expression
cron is a feature originating from Unix cron utility and has various options based on your requirements.
package com.the.basic.tech.info.app;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
@Component
public class ScheduledTasks {
private static final Logger logger = LoggerFactory.getLogger(ScheduledTasks.class);
private static final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("HH:mm:ss");
@Scheduled(cron = "0 * * * * ?")
public void scheduleTaskWithCronExpression() {
logger.info("Cron Task :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()));
}
}
Output
2021-05-28 18:11:54.526 INFO 3776 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : No active profile set, falling back to default profiles: default
2021-05-28 18:11:56.283 INFO 3776 --- [ main] o.s.s.c.ThreadPoolTaskScheduler : Initializing ExecutorService
2021-05-28 18:11:56.309 INFO 3776 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : Started SchedulerDemoApplication in 3.04 seconds (JVM running for 4.047)
2021-05-28 18:12:00.011 INFO 3776 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Cron Task :: Execution Time - 18:12:00
2021-05-28 18:13:00.002 INFO 3776 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Cron Task :: Execution Time - 18:13:00
Example: Scheduled Task with fixedRate
fixedRate makes Spring boot run the task on periodic intervals even if the last invocation may be still running.
package com.the.basic.tech.info.app;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.TimeUnit;
@Component
public class ScheduledTasks {
private static final Logger logger = LoggerFactory.getLogger(ScheduledTasks.class);
private static final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("HH:mm:ss");
@Scheduled(fixedRate = 2000)
public void scheduleTaskWithFixedRate() {
logger.info("Fixed Rate Task :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()) );
}
}
Output
2021-05-28 18:17:41.070 INFO 16588 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : No active profile set, falling back to default profiles: default
2021-05-28 18:17:41.926 INFO 16588 --- [ main] o.s.s.c.ThreadPoolTaskScheduler : Initializing ExecutorService
2021-05-28 18:17:41.926 INFO 16588 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:17:41
2021-05-28 18:17:41.941 INFO 16588 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : Started SchedulerDemoApplication in 1.406 seconds (JVM running for 1.979)
2021-05-28 18:17:43.945 INFO 16588 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:17:43
2021-05-28 18:17:45.976 INFO 16588 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:17:45
2021-05-28 18:17:47.955 INFO 16588 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:17:47
2021-05-28 18:17:49.939 INFO 16588 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:17:49
2021-05-28 18:17:51.939 INFO 16588 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:17:51
2021-05-28 18:17:53.939 INFO 16588 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:17:53
2021-05-28 18:17:55.939 INFO 16588 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:17:55
2021-05-28 18:17:57.940 INFO 16588 --- [led-task-pool-5] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:17:57
2021-05-28 18:17:59.940 INFO 16588 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:17:59
2021-05-28 18:18:01.941 INFO 16588 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:18:01
2021-05-28 18:18:03.941 INFO 16588 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:18:03
2021-05-28 18:18:05.940 INFO 16588 --- [led-task-pool-7] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:18:05
Example: Scheduled Task with fixedDelay
fixedDelay specifically controls the next execution time when the last execution finishes.
package com.the.basic.tech.info.app;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.TimeUnit;
@Component
public class ScheduledTasks {
private static final Logger logger = LoggerFactory.getLogger(ScheduledTasks.class);
private static final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("HH:mm:ss");
@Scheduled(fixedDelay = 2000)
public void scheduleTaskWithFixedDelay() {
logger.info("Fixed Delay Task :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()));
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException ex) {
logger.error("Ran into an error {}", ex);
throw new IllegalStateException(ex);
}
}
}
Output
2021-05-28 18:24:39.624 INFO 6704 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : No active profile set, falling back to default profiles: default
2021-05-28 18:24:40.516 INFO 6704 --- [ main] o.s.s.c.ThreadPoolTaskScheduler : Initializing ExecutorService
2021-05-28 18:24:40.524 INFO 6704 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:24:40
2021-05-28 18:24:40.533 INFO 6704 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : Started SchedulerDemoApplication in 1.725 seconds (JVM running for 2.671)
2021-05-28 18:24:43.528 INFO 6704 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:24:43
2021-05-28 18:24:46.529 INFO 6704 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:24:46
2021-05-28 18:24:49.533 INFO 6704 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:24:49
2021-05-28 18:24:52.535 INFO 6704 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:24:52
2021-05-28 18:24:55.551 INFO 6704 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:24:55
2021-05-28 18:24:58.559 INFO 6704 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:24:58
2021-05-28 18:25:01.564 INFO 6704 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:25:01
2021-05-28 18:25:04.568 INFO 6704 --- [led-task-pool-5] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:25:04
2021-05-28 18:25:07.571 INFO 6704 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:25:07
2021-05-28 18:25:10.574 INFO 6704 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:25:10
2021-05-28 18:25:13.580 INFO 6704 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:25:13
2021-05-28 18:25:16.585 INFO 6704 --- [led-task-pool-7] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:25:16
2021-05-28 18:25:19.588 INFO 6704 --- [led-task-pool-7] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:25:19
2021-05-28 18:25:22.590 INFO 6704 --- [led-task-pool-7] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:25:22
Example: Scheduled Task with fixedRate and initialDelay
package com.the.basic.tech.info.app;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.TimeUnit;
@Component
public class ScheduledTasks {
private static final Logger logger = LoggerFactory.getLogger(ScheduledTasks.class);
private static final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("HH:mm:ss");
@Scheduled(fixedRate = 2000, initialDelay = 5000)
public void scheduleTaskWithInitialDelay() {
logger.info("Fixed Rate Task with Initial Delay :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()));
}
}
Output
2021-05-28 18:31:01.937 INFO 9520 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : No active profile set, falling back to default profiles: default
2021-05-28 18:31:03.024 INFO 9520 --- [ main] o.s.s.c.ThreadPoolTaskScheduler : Initializing ExecutorService
2021-05-28 18:31:03.040 INFO 9520 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : Started SchedulerDemoApplication in 1.919 seconds (JVM running for 2.866)
2021-05-28 18:31:08.033 INFO 9520 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:08
2021-05-28 18:31:10.032 INFO 9520 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:10
2021-05-28 18:31:12.034 INFO 9520 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:12
2021-05-28 18:31:14.037 INFO 9520 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:14
2021-05-28 18:31:16.033 INFO 9520 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:16
2021-05-28 18:31:18.044 INFO 9520 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:18
2021-05-28 18:31:20.034 INFO 9520 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:20
2021-05-28 18:31:22.033 INFO 9520 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:22
2021-05-28 18:31:24.039 INFO 9520 --- [led-task-pool-5] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:24
2021-05-28 18:31:26.047 INFO 9520 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:26
2021-05-28 18:31:28.033 INFO 9520 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:28
2021-05-28 18:31:30.034 INFO 9520 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:30
2021-05-28 18:31:32.039 INFO 9520 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:32
2021-05-28 18:31:34.033 INFO 9520 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:34
2021-05-28 18:31:36.035 INFO 9520 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:36
2021-05-28 18:31:38.035 INFO 9520 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:38
2021-05-28 18:31:40.033 INFO 9520 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:31:40Example: Scheduled Tasks with all 4 ways
package com.the.basic.tech.info.app;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.TimeUnit;
@Component
public class ScheduledTasks {
private static final Logger logger = LoggerFactory.getLogger(ScheduledTasks.class);
private static final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("HH:mm:ss");
@Scheduled(fixedRate = 2000)
public void scheduleTaskWithFixedRate() {
logger.info("Fixed Rate Task :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()));
}
@Scheduled(fixedDelay = 2000)
public void scheduleTaskWithFixedDelay() {
logger.info("Fixed Delay Task :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()));
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException ex) {
logger.error("Ran into an error {}", ex);
throw new IllegalStateException(ex);
}
}
@Scheduled(fixedRate = 2000, initialDelay = 5000)
public void scheduleTaskWithInitialDelay() {
logger.info("Fixed Rate Task with Initial Delay :: Execution Time - {}",
dateTimeFormatter.format(LocalDateTime.now()));
}
@Scheduled(cron = "0 * * * * ?")
public void scheduleTaskWithCronExpression() {
logger.info("Cron Task :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()));
}
}
Output
2021-05-28 18:34:18.005 INFO 17928 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : No active profile set, falling back to default profiles: default
2021-05-28 18:34:19.147 INFO 17928 --- [ main] o.s.s.c.ThreadPoolTaskScheduler : Initializing ExecutorService
2021-05-28 18:34:19.158 INFO 17928 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:34:19
2021-05-28 18:34:19.162 INFO 17928 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:34:19
2021-05-28 18:34:19.167 INFO 17928 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : Started SchedulerDemoApplication in 1.94 seconds (JVM running for 2.816)
2021-05-28 18:34:21.160 INFO 17928 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:34:21
2021-05-28 18:34:22.165 INFO 17928 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:34:22
2021-05-28 18:34:23.159 INFO 17928 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:34:23
2021-05-28 18:34:24.158 INFO 17928 --- [led-task-pool-5] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:34:24
2021-05-28 18:34:25.160 INFO 17928 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:34:25
2021-05-28 18:34:25.176 INFO 17928 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:34:25
2021-05-28 18:34:26.162 INFO 17928 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:34:26
2021-05-28 18:34:27.164 INFO 17928 --- [led-task-pool-7] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:34:27
2021-05-28 18:34:28.158 INFO 17928 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:34:28
2021-05-28 18:34:28.180 INFO 17928 --- [led-task-pool-8] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:34:28
2021-05-28 18:34:29.166 INFO 17928 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:34:29
2021-05-28 18:34:30.157 INFO 17928 --- [led-task-pool-9] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:34:30
2021-05-28 18:34:31.169 INFO 17928 --- [led-task-pool-5] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:34:31
2021-05-28 18:34:31.185 INFO 17928 --- [ed-task-pool-10] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:34:31
2021-05-28 18:34:32.172 INFO 17928 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:34:32Example: Running Parallel Tasks (@Async)
If your tasks that can be run parallely and next job not needed output of the previous run then you can use @EnableAync power in Spring Boot.
package com.the.basic.tech.info.app;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.concurrent.TimeUnit;
@Component
public class ScheduledTasks {
private static final Logger logger = LoggerFactory.getLogger(ScheduledTasks.class);
private static final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("HH:mm:ss");
@Async
@Scheduled(fixedRate = 2000)
public void scheduleTaskWithFixedRate() {
logger.info("Fixed Rate Task :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()));
}
@Async
@Scheduled(fixedDelay = 2000)
public void scheduleTaskWithFixedDelay() {
logger.info("Fixed Delay Task :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()));
try {
TimeUnit.SECONDS.sleep(1);
} catch (InterruptedException ex) {
logger.error("Ran into an error {}", ex);
throw new IllegalStateException(ex);
}
}
@Async
@Scheduled(fixedRate = 2000, initialDelay = 5000)
public void scheduleTaskWithInitialDelay() {
logger.info("Fixed Rate Task with Initial Delay :: Execution Time - {}",
dateTimeFormatter.format(LocalDateTime.now()));
}
@Async
@Scheduled(cron = "0 * * * * ?")
public void scheduleTaskWithCronExpression() {
logger.info("Cron Task :: Execution Time - {}", dateTimeFormatter.format(LocalDateTime.now()));
}
}
Output
2021-05-28 18:53:31.270 INFO 12772 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : No active profile set, falling back to default profiles: default
2021-05-28 18:53:32.376 INFO 12772 --- [ main] o.s.s.c.ThreadPoolTaskScheduler : Initializing ExecutorService
2021-05-28 18:53:32.386 INFO 12772 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:53:32
2021-05-28 18:53:32.386 INFO 12772 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:32
2021-05-28 18:53:32.393 INFO 12772 --- [ main] c.t.b.t.i.app.SchedulerDemoApplication : Started SchedulerDemoApplication in 1.785 seconds (JVM running for 2.513)
2021-05-28 18:53:34.386 INFO 12772 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:34
2021-05-28 18:53:35.390 INFO 12772 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:53:35
2021-05-28 18:53:36.386 INFO 12772 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:36
2021-05-28 18:53:37.387 INFO 12772 --- [led-task-pool-5] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:37
2021-05-28 18:53:38.386 INFO 12772 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:38
2021-05-28 18:53:38.391 INFO 12772 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:53:38
2021-05-28 18:53:39.387 INFO 12772 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:39
2021-05-28 18:53:40.388 INFO 12772 --- [led-task-pool-7] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:40
2021-05-28 18:53:41.389 INFO 12772 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:41
2021-05-28 18:53:41.396 INFO 12772 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:53:41
2021-05-28 18:53:42.388 INFO 12772 --- [led-task-pool-8] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:42
2021-05-28 18:53:43.388 INFO 12772 --- [led-task-pool-9] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:43
2021-05-28 18:53:44.386 INFO 12772 --- [led-task-pool-5] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:44
2021-05-28 18:53:44.398 INFO 12772 --- [ed-task-pool-10] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:53:44
2021-05-28 18:53:45.387 INFO 12772 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:45
2021-05-28 18:53:46.386 INFO 12772 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:46
2021-05-28 18:53:47.387 INFO 12772 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:47
2021-05-28 18:53:47.400 INFO 12772 --- [led-task-pool-7] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:53:47
2021-05-28 18:53:48.386 INFO 12772 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:48
2021-05-28 18:53:49.388 INFO 12772 --- [led-task-pool-8] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:49
2021-05-28 18:53:50.388 INFO 12772 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:50
2021-05-28 18:53:50.402 INFO 12772 --- [led-task-pool-9] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:53:50
2021-05-28 18:53:51.387 INFO 12772 --- [led-task-pool-5] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:51
2021-05-28 18:53:52.387 INFO 12772 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:52
2021-05-28 18:53:53.388 INFO 12772 --- [ed-task-pool-10] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:53
2021-05-28 18:53:53.402 INFO 12772 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:53:53
2021-05-28 18:53:54.387 INFO 12772 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:54
2021-05-28 18:53:55.388 INFO 12772 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:55
2021-05-28 18:53:56.386 INFO 12772 --- [led-task-pool-7] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:56
2021-05-28 18:53:56.405 INFO 12772 --- [led-task-pool-8] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:53:56
2021-05-28 18:53:57.387 INFO 12772 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:57
2021-05-28 18:53:58.388 INFO 12772 --- [led-task-pool-5] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:53:58
2021-05-28 18:53:59.387 INFO 12772 --- [led-task-pool-9] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:53:59
2021-05-28 18:53:59.407 INFO 12772 --- [led-task-pool-3] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:53:59
2021-05-28 18:54:00.007 INFO 12772 --- [ed-task-pool-10] c.t.basic.tech.info.app.ScheduledTasks : Cron Task :: Execution Time - 18:54:00
2021-05-28 18:54:00.388 INFO 12772 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:54:00
2021-05-28 18:54:01.387 INFO 12772 --- [led-task-pool-2] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:54:01
2021-05-28 18:54:02.387 INFO 12772 --- [led-task-pool-1] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:54:02
2021-05-28 18:54:02.409 INFO 12772 --- [led-task-pool-7] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:54:02
2021-05-28 18:54:03.391 INFO 12772 --- [led-task-pool-4] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:54:03
2021-05-28 18:54:04.386 INFO 12772 --- [led-task-pool-8] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:54:04
2021-05-28 18:54:05.387 INFO 12772 --- [led-task-pool-5] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:54:05
2021-05-28 18:54:05.423 INFO 12772 --- [led-task-pool-9] c.t.basic.tech.info.app.ScheduledTasks : Fixed Delay Task :: Execution Time - 18:54:05
2021-05-28 18:54:06.387 INFO 12772 --- [ed-task-pool-10] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task :: Execution Time - 18:54:06
2021-05-28 18:54:07.387 INFO 12772 --- [led-task-pool-6] c.t.basic.tech.info.app.ScheduledTasks : Fixed Rate Task with Initial Delay :: Execution Time - 18:54:07Download Source Code (Attached)
Kindly, let me know in case I missed anything. Enjoy :).