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Task Scheduling Solutions for Efficient Workflow Management

Explore Java Timer and TimerTask for scheduling tasks, Spring support, Quartz triggers, Cron expressions, and more for optimized task handling. Enhance productivity with scheduled jobs and reminders. Simplify workflow management with Quartz and Spring integration.

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Task Scheduling Solutions for Efficient Workflow Management

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  1. CS520 Web ProgrammingTask Scheduling Chengyu Sun California State University, Los Angeles

  2. Scheduled Tasks • Daily or weekly email digest • Offline processing • Index optimization • Topic clustering • Service reminders • …

  3. Java Timer and TimerTask public class TimerTest { public static void main( String args[] ) { new Timer().schedule( new ScheduledTask(), 5000, 2000 ); System.out.println( "task scheduled" ); } } class ScheduledTask extends TimerTask { public void run() { System.out.println( "hello" ); } }

  4. TimerTask Scheduling • Execute Once • schedule(TimerTask task, Date time) • schedule(TimerTask task, long delay) • Execute periodically • schedule(TimerTask task, Date firstTime, long period) • schedule(TimerTask task, long delay, long period)

  5. Spring Support for TimerTask <bean id=“someScheduledTask" class="org.springframework.scheduling.timer.ScheduledTimerTask"> <property name="timerTask"> <ref bean=“someTimerTask"/> </property> <property name="delay"> <value>3600000</value> </property> <property name="period"> <value>86400000</value> </property> </bean>

  6. Quartz • http://www.opensymphony.com/quartz/ • Triggers • Simple triggers • Cron triggers • Jobs • Execution • Persistence • … and more

  7. Cron Expression • Seven field separated by space • Seconds (0-59) • Minutes (0-59) • Hours (0-23) • Day of month (1-31) • Month (1-12 or JAN-DEC) • Day of week (1-7 or MON-SUN) • Year (1970-2099) [optional]

  8. Cron Field Values • Single value, e.g. 12 • Set of values, e.g. 0,15,30,45 • Range, e.g. 1-12 • * • Day of month and day of week are mutually exclusive, so one of them should be ?

  9. Cron Expression Examples 0 0 10,14,16 * * ? 0 0,15,30,45 * 1-10 * ? 30 0 0 1 1 ? 2012 0 0 8-5 ? * MON-FRI

  10. Spring Support for Quartz • Job • QuartzJobBean • Single method invocation • Trigger • Simple trigger using start time and repeat interval (optional) • Cron trigger using cron expression • Schedule • SchedulerFactoryBean

  11. Evelyn Example • CheckUsersJob • IndexOptimizationJob

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