Spring provides excellent support 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 post, I will show the means to use @Scheduled feature in 4 different ways.
Read More : Spring timer tasks
Table of Contents 1. @Scheduled Annotation 2. Fixed delay or Fixed rate 3. Cron expressions 4. Cron expression from properties file 5. Cron expression in context configuration
1. Spring @Scheduled Annotation
@Scheduled annotation is used for task scheduling. The trigger information needs to be provided along with this annotation.
1.1. fixedDelay vs fixedRate vs cron
You can use the properties fixedDelay/fixedRate/cron to provide the triggering information. where –
- fixedRate makes Spring run the task on periodic intervals even if the last invocation may be still running.
- fixedDelay specifically controls the next execution time when the last execution finishes.
- cron is a feature originating from Unix cron utility and has various options based on your requirements.
Example usage can be as below:
@Scheduled(fixedDelay =30000)
public void demoServiceMethod () {... }
@Scheduled(fixedRate=30000)
public void demoServiceMethod () {... }
@Scheduled(cron="0 0 * * * *")
public void demoServiceMethod () {... }
1.2. How to enable @Scheduled annotation
To use @Scheduled in your spring application, you must first define below xml namespace and schema location definition in your applicationConfig.xml file. Also add task:annotation-driven to enable annotation based task scheduling.
xmlns:task="http://www.springframework.org/schema/task" http://www.springframework.org/schema/task/ http://www.springframework.org/schema/task/spring-task-3.0.xsd <task:annotation-driven>
Above additions are necessary because we will be using annotation based configurations.
1.3. Using @Scheduled annotation
Next step is to create a class and a method inside the class like below:
public class DemoService
{
@Scheduled(cron="*/5 * * * * ?")
public void demoServiceMethod()
{
System.out.println("Method executed at every 5 seconds. Current time is :: "+ new Date());
}
}
In above example –
- Using
@Scheduledannotation would in turn make Spring container understand that the method underneath this annotation would run as a job. - Remember that the methods annotated with
@Scheduledshould not have parameters passed to them. - They should not return any values too.
- If you want the external objects to be used within your @Scheduled methods, you should inject them into the
DemoServiceclass using autowiring rather than passing them as parameters to the@Scheduledmethods.
2. @Scheduled with fixed delay or fixed rate
In this method, fixedDelay attribute is used with @Scheduled annotation. Alternatively, fixedRate can also be used.
A sample class will look like this:
package com.howtodoinjava.service;
import java.util.Date;
import org.springframework.scheduling.annotation.Scheduled;
public class DemoServiceBasicUsageFixedDelay
{
@Scheduled(fixedDelay = 5000)
//@Scheduled(fixedRate = 5000) //Or use this
public void demoServiceMethod()
{
System.out.println("Method executed at every 5 seconds. Current time is :: "+ new Date());
}
}
And application configuration will look like this:
< ?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context/ http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/util/ http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/task/ http://www.springframework.org/schema/task/spring-task-3.0.xsd">
<task:annotation-driven />
<bean id="demoServiceBasicUsageFixedDelay" class="com.howtodoinjava.service.DemoServiceBasicUsageFixedDelay"></bean>
</beans>
3. @Scheduled with cron expression
In this method, cron attribute is used with @Scheduled annotation. Value of this attribute must be a cron expression.
A sample class will look like this:
package com.howtodoinjava.service;
import java.util.Date;
import org.springframework.scheduling.annotation.Scheduled;
public class DemoServiceBasicUsageCron
{
@Scheduled(cron="*/5 * * * * ?")
public void demoServiceMethod()
{
System.out.println("Method executed at every 5 seconds. Current time is :: "+ new Date());
}
}
And application configuration will look like this:
< ?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context/ http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/util/ http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/task/ http://www.springframework.org/schema/task/spring-task-3.0.xsd">
<task:annotation-driven />
<bean id="demoServiceBasicUsageCron" class="com.howtodoinjava.service.DemoServiceBasicUsageCron"></bean>
</beans>
4. Cron expression from properties file
In this method, cron attribute is used with @Scheduled annotation. Value of this attribute must be a cron expression as in previous method, BUT, this cron expression will be defined in a properties file and key of related property will be used in @Scheduled annotation.
This will decouple the cron expression from source code, thus making changes easy.
package com.howtodoinjava.service;
import java.util.Date;
import org.springframework.scheduling.annotation.Scheduled;
public class DemoServicePropertiesExample {
@Scheduled(cron = "${cron.expression}")
public void demoServiceMethod()
{
System.out.println("Method executed at every 5 seconds. Current time is :: "+ new Date());
}
}
And application configuration will look like this:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context/ http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/util/ http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/task/ http://www.springframework.org/schema/task/spring-task-3.0.xsd">
<task:annotation-driven />
<util:properties id="applicationProps" location="application.properties" />
<context:property-placeholder properties-ref="applicationProps" />
<bean id="demoServicePropertiesExample" class="com.howtodoinjava.service.DemoServicePropertiesExample"></bean>
</beans>
5. Cron expression in context configuration
In this method, cron expression is configured in properties file, and job scheduling is configured in configuration file using property key for cron expression. Major change is that you do not need to use @Scheduled annotation on any method. Method configuration is also done in application configuration file.
A sample class will look like this:
package com.howtodoinjava.service;
import java.util.Date;
public class DemoServiceXmlConfig
{
public void demoServiceMethod()
{
System.out.println("Method executed at every 5 seconds. Current time is :: "+ new Date());
}
}
And application configuration will look like this:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context/ http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/util/ http://www.springframework.org/schema/util/spring-util.xsd
http://www.springframework.org/schema/task/ http://www.springframework.org/schema/task/spring-task-3.0.xsd">
<task:annotation-driven />
<util:properties id="applicationProps" location="application.properties" />
<context:property-placeholder properties-ref="applicationProps" />
<bean id="demoServiceXmlConfig" class="com.howtodoinjava.service.DemoServiceXmlConfig" />
<task:scheduled-tasks>
<task:scheduled ref="demoServiceXmlConfig" method="demoServiceMethod" cron="#{applicationProps['cron.expression']}"></task:scheduled>
</task:scheduled-tasks>
</beans>
Let me know if I am missing anything.
Happy Learning !!
Reference:
http://forum.springsource.org/showthread.php?83053-Feature-Scheduled-with-Value-cron-expression
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