Thursday, September 18, 2008

Quartz Scheduler First Impression

Quartz Scheduler is used to make a scheduling job. In this post we will make a scheduler to generate daily report for persons report that have we made before for each one minute. Here we start. Download first Quartz library and copy it into spring lib folder. In package com.ndung.service create two interfaces named EODManager.java and Executable.java.


package com.ndung.service;

public interface EODManager {
void executeEOD();
}

package com.ndung.service;

public interface Executable {
void execute() throws Exception;
}

In package com.ndung.service.impl add a class named EODManagerImpl.java

package com.ndung.service.impl;

import java.util.List;
import com.ndung.service.EODManager;
import com.ndung.service.Executable;

public class EODManagerImpl implements EODManager {
private List<Executable> executables;
public void setExecutables(List<Executable> executables) {
this.executables = executables;
}
public void executeEOD() {
for (Executable executable : executables) {
try { executable.execute(); }
catch (Exception e) { e.printStackTrace(); }
}
}
}


Edit PersonManager.java and PersonManagerImpl.java like belows.

public interface PersonManager extends Manager, Executable{
...
public void generateDailyReport();
}

PersonManagerImpl.java

public void generateDailyReport() {
File dirPath = new File("report");
if (!dirPath.exists()) {
dirPath.mkdirs();
}
File filePath = new File(dirPath+"/PersonReport.pdf");
Map<String, Object> mapReport = new HashMap<String, Object>();
mapReport.put("title", "Persons Report");
mapReport.put("date", new Date());
ReportUtil.generateReport("PersonsReport.jrxml", filePath.getAbsolutePath(),
dao.getPersons(null), mapReport, "pdf");
}
public void execute() throws Exception {
generateDailyReport();
}

Add a bean in applicationContext-service.xml for eodManager.

<bean id="eodManager" class="com.ndung.service.impl.EODManagerImpl">
<property name="executables">
<list>
<ref bean="personManager" />
</list>
</property>
</bean>

In folder web/WEB-INF create applicationContext file named applicationContext-schedule.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
<property name="triggers">
<list>
<ref local="cronTrigger" />
</list>
</property>
</bean>

<bean id="cronTrigger"
class="org.springframework.scheduling.quartz.CronTriggerBean">
<property name="jobDetail">
<ref bean="methodInvokingJobDetail" />
</property>
<property name="cronExpression">
<value>0 0/1 * * * ?</value>
</property>
</bean>

<bean id="methodInvokingJobDetail"
class="org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean">
<property name="targetObject">
<ref bean="eodManager" />
</property>
<property name="targetMethod">
<value>executeEOD</value>
</property>
</bean>
</beans>

Run our application and check out if there a file in report/PersonReport.pdf in our computer.

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