spring定時器------QuartzJobBean

    1. 層次結構
        
    2. 源碼   

package org.springframework.scheduling.quartz; 
  
import org.quartz.Job; 
import org.quartz.JobExecutionContext; 
import org.quartz.JobExecutionException; 
import org.quartz.SchedulerException; 
  
import org.springframework.beans.BeanWrapper; 
import org.springframework.beans.MutablePropertyValues; 
import org.springframework.beans.PropertyAccessorFactory; 
  
/** 
 * Simple implementation of the Quartz Job interface, applying the 
 * passed-in JobDataMap and also the SchedulerContext as bean property 
 * values. This is appropriate because a new Job instance will be created 
 * for each execution. JobDataMap entries will override SchedulerContext 
 * entries with the same keys. 
 * 
 * <p>For example, let's assume that the JobDataMap contains a key 
 * "myParam" with value "5": The Job implementation can then expose 
 * a bean property "myParam" of type int to receive such a value, 
 * i.e. a method "setMyParam(int)". This will also work for complex 
 * types like business objects etc. 
 * 
 * <p>Note: The QuartzJobBean class itself only implements the standard 
 * Quartz {@link org.quartz.Job} interface. Let your subclass explicitly 
 * implement the Quartz {@link org.quartz.StatefulJob} interface to 
 * mark your concrete job bean as stateful. 
 * 
 * <p>This version of QuartzJobBean requires Quartz 1.5 or higher, 
 * due to the support for trigger-specific job data. 
 * 
 * <p><b>Note that as of Spring 2.0 and Quartz 1.5, the preferred way 
 * to apply dependency injection to Job instances is via a JobFactory:</b> 
 * that is, to specify {@link SpringBeanJobFactory} as Quartz JobFactory 
 * (typically via 
 * {@link SchedulerFactoryBean#setJobFactory} SchedulerFactoryBean's "jobFactory" property}). 
 * This allows to implement dependency-injected Quartz Jobs without 
 * a dependency on Spring base classes. 

 */
public abstract class QuartzJobBean implements Job { 
  
    /** 
     * This implementation applies the passed-in job data map as bean property 
     * values, and delegates to <code>executeInternal</code> afterwards. 
     * @see #executeInternal 
     */
    public final void execute(JobExecutionContext context) throws JobExecutionException { 
        try { 
            BeanWrapper bw = PropertyAccessorFactory.forBeanPropertyAccess(this); 
            MutablePropertyValues pvs = new MutablePropertyValues(); 
            pvs.addPropertyValues(context.getScheduler().getContext()); 
            pvs.addPropertyValues(context.getMergedJobDataMap()); 
            bw.setPropertyValues(pvs, true); 
        } 
        catch (SchedulerException ex) { 
            throw new JobExecutionException(ex); 
        } 
        executeInternal(context); 
    } 
  
    /** 
     * Execute the actual job. The job data map will already have been 
     * applied as bean property values by execute. The contract is 
     * exactly the same as for the standard Quartz execute method. 
     * @see #execute 
     */
    protected abstract void executeInternal(JobExecutionContext context) throws JobExecutionException; 
  
}

      3. 應用demo參見「spring定時器的應用----------繼承QuartzJobBean的demo」。