Spring Batch TaskScheduler example（九）
1. Project Directory Structure
A standard Maven project.
2. Spring TaskScheduler
Spring 3.0 introduces a TaskScheduler for scheduling tasks. It’s part of the Spring-Core,
no need to declare an extra dependency.
<task:scheduled-tasks>
<task:scheduled ref="runScheduler" method="run" fixed-delay="5000" />
</task:scheduled-tasks>
<task:scheduled-tasks>
<task:scheduled ref="runScheduler" method="run" cron="*/5 * * * * *" />
</task:scheduled-tasks>
The TaskScheduler will schedule to run below bean.
RunScheduler.java
package com.mkyong;
import java.util.Date;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobExecution;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.JobParametersBuilder;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class RunScheduler {
@Autowired
private JobLauncher jobLauncher;
@Autowired
private Job job;
public void run() {
try {
String dateParam = new Date().toString();
JobParameters param =
new JobParametersBuilder().addString("date", dateParam).toJobParameters();
System.out.println(dateParam);
JobExecution execution = jobLauncher.run(job, param);
System.out.println("Exit Status : " + execution.getStatus());
} catch (Exception e) {
e.printStackTrace();
}
}
}
P.S JobParamater need to be unique each time a batch job to run, for testing purpose, we just pass in a new
Date()everything running the job.
3. Spring Batch Jobs
This job is just reading a csv file and display the value via a custom writer. Refer to the end of the file, we usetask:scheduled-tasks to
run this batch job every 5 seconds.
resources/spring/batch/jobs/job-report.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:batch="http://www.springframework.org/schema/batch"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:task="http://www.springframework.org/schema/task"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/batch
http://www.springframework.org/schema/batch/spring-batch-2.2.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.2.xsd
http://www.springframework.org/schema/task
http://www.springframework.org/schema/task/spring-task-3.2.xsd
">
<context:component-scan base-package="com.mkyong" />
<!-- job context -->
<bean id="jobRepository"
class="org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean">
<property name="transactionManager" ref="transactionManager" />
</bean>
<bean id="transactionManager"
class="org.springframework.batch.support.transaction.ResourcelessTransactionManager" />
<bean id="jobLauncher"
class="org.springframework.batch.core.launch.support.SimpleJobLauncher">
<property name="jobRepository" ref="jobRepository" />
</bean>
<!-- job context -->
<bean id="report" class="com.mkyong.model.Report" scope="prototype" />
<bean id="customWriter" class="com.mkyong.writers.CustomWriter" />
<batch:job id="reportJob">
<batch:step id="step1">
<batch:tasklet>
<batch:chunk reader="cvsFileItemReader" writer="customWriter"
commit-interval="10">
</batch:chunk>
</batch:tasklet>
</batch:step>
</batch:job>
<bean id="cvsFileItemReader"
class="org.springframework.batch.item.file.FlatFileItemReader">
<!-- Read a csv file -->
<property name="resource" value="classpath:cvs/input/report.csv" />
<property name="lineMapper">
<bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
<property name="lineTokenizer">
<bean
class="org.springframework.batch.item.file.transform.DelimitedLineTokenizer">
<property name="names" value="id,impressions" />
</bean>
</property>
<property name="fieldSetMapper">
<bean
class="org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper">
<property name="prototypeBeanName" value="report" />
</bean>
</property>
</bean>
</property>
</bean>
<bean id="runScheduler" class="com.mkyong.RunScheduler" />
<!-- Run every 5 seconds -->
<task:scheduled-tasks>
<!--
<task:scheduled ref="runScheduler" method="run" fixed-delay="5000" />
-->
<task:scheduled ref="runScheduler" method="run" cron="*/5 * * * * *" />
</task:scheduled-tasks>
</beans>
report.csv
1,"139,237"
2,"500,657"
3,"342,100"
CustomWriter.java
package com.mkyong.writers;
import java.util.List;
import org.springframework.batch.item.ItemWriter;
import com.mkyong.model.Report;
public class CustomWriter implements ItemWriter<Report> {
@Override
public void write(List<? extends Report> items) throws Exception {
System.out.println("writer..." + items.size());
for(Report item : items){
System.out.println(item);
}
}
}
4. Run It
Loads the Spring application context, the scheduler will be run automatically.
App.java
package com.mkyong;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App {
public static void main(String[] args) {
String springConfig = "spring/batch/jobs/job-report.xml";
ApplicationContext context = new ClassPathXmlApplicationContext(springConfig);
}
}
Output, it prints the csv content every 5 seconds.
......
Sun Jul 28 11:20:30 MYT 2013
Jul 28, 2013 11:20:30 AM org.springframework.batch.core.launch.support.SimpleJobLauncher$1 run
INFO: Job: [FlowJob: [name=reportJob]] launched with the following parameters: [{date=Sun Jul 28 11:20:30 MYT 2013}]
Jul 28, 2013 11:20:30 AM org.springframework.batch.core.job.SimpleStepHandler handleStep
INFO: Executing step: [step1]
writer...3
Report [id=1, Impressions=139,237]
Report [id=2, Impressions=500,657]
Report [id=3, Impressions=342,100]
Jul 28, 2013 11:20:30 AM org.springframework.batch.core.launch.support.SimpleJobLauncher$1 run
INFO: Job: [FlowJob: [name=reportJob]] completed with the following parameters: [{date=Sun Jul 28 11:20:30 MYT 2013}] and the following status: [COMPLETED]
Exit Status : COMPLETED
Sun Jul 28 11:20:35 MYT 2013
Jul 28, 2013 11:20:35 AM org.springframework.batch.core.launch.support.SimpleJobLauncher$1 run
INFO: Job: [FlowJob: [name=reportJob]] launched with the following parameters: [{date=Sun Jul 28 11:20:35 MYT 2013}]
Jul 28, 2013 11:20:35 AM org.springframework.batch.core.job.SimpleStepHandler handleStep
INFO: Executing step: [step1]
writer...3
Report [id=1, Impressions=139,237]
Report [id=2, Impressions=500,657]
Report [id=3, Impressions=342,100]
Exit Status : COMPLETED
Jul 28, 2013 11:20:35 AM org.springframework.batch.core.launch.support.SimpleJobLauncher$1 run
INFO: Job: [FlowJob: [name=reportJob]] completed with the following parameters: [{date=Sun Jul 28 11:20:35 MYT 2013}] and the following status: [COMPLETED]
......