我正在尝试将以下Spring任务xml配置转换为纯粹基于代码/注释的版本:
<task:executor id="xyz.executor"
pool-size="${xyz.job.executor.pool.size:1-40}"
queue-capacity="${xyz.job.executor.queue.capacity:0}"
rejection-policy="CALLER_RUNS"/>
<task:scheduler id="xyz.scheduler" pool size="${xyz.job.scheduler.pool.size:4}" />
<task:annotation-driven executor="xyz.executor" scheduler="xyz.scheduler" />
<bean id='xyzProcessor' class="xyz.queueing.QueueProcessor" />
<task:scheduled-tasks scheduler="xyz.scheduler" >
<task:scheduled ref="partitioner" method="createPartitions" cron="${xyz.job.partitioner.interval:0 0 3 * * *}" />
</task:scheduled-tasks>
根据Spring规范,28.4.1(http://docs.spring.io/spring/docs/current/spring-framework-reference/html/scheduling.html),他们说要像这样来自XML:
<task:annotation-driven executor="myExecutor" scheduler="myScheduler"/>
<task:executor id="myExecutor" pool-size="5"/>
<task:scheduler id="myScheduler" pool-size="10"/>
代码配置就像启用@EnableScheduling和/或@EnableAsync一样简单。
但是,我没有看到任何可以实际实例化调度程序的地方。 @EnableScheduling(http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/scheduling/annotation/EnableScheduling.html)的javadoc展示了如何插入我自己创建的Executor,虽然我不确定它应该是什么类(我仍然希望能够控制池的大小,队列容量和拒绝策略)。它还显示了如何使用configureTasks覆盖来调度我的createPartitions方法。但是,我希望能够命名我的调度程序(因此我可以识别其线程)并控制其池大小。
所以,我想知道这些事情:
1)我可以使用哪个类来设置XML具有的执行器字段?
2)有没有办法创建一个我可以控制名称和池大小的调度程序实例?
答案 0 :(得分:11)
查看类型AsyncConfigurer
,AsyncConfigurerSupport
和SchedulingConfigurer
。它们是辅助类型,可用于使用异步/调度配置来增强@Configuration
类。
在所有这些内容以及@EnabledAsync
的javadoc中,您将找到设置异步/调度@Configuration
类所需的所有设置方法。
给出的例子等同于
@Configuration
@EnableAsync
public class AppConfig implements AsyncConfigurer {
@Bean
public MyAsyncBean asyncBean() {
return new MyAsyncBean();
}
@Override
public Executor getAsyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(7);
executor.setMaxPoolSize(42);
executor.setQueueCapacity(11);
executor.setThreadNamePrefix("MyExecutor-");
executor.initialize();
return executor;
}
@Override
public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
return new MyAsyncUncaughtExceptionHandler();
}
}
与
<beans>
<task:annotation-driven executor="myExecutor" exception-handler="exceptionHandler"/>
<task:executor id="myExecutor" pool-size="7-42" queue-capacity="11"/>
<bean id="asyncBean" class="com.foo.MyAsyncBean"/>
<bean id="exceptionHandler" class="com.foo.MyAsyncUncaughtExceptionHandler"/>
</beans>
SchedulingConfigurer
对task:scheduler
有类似的设置。
答案 1 :(得分:3)
如果您想要更细粒度的控制,您还可以实现SchedulingConfigurer
和/或AsyncConfigurer
接口。
如下所示,
请注意池,
@Configuration
@EnableScheduling
public class CronConfig implements SchedulingConfigurer{
@Override
public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
taskRegistrar.setScheduler(taskExecutor());
}
@Bean(destroyMethod="shutdown")
public Executor taskExecutor() {
return Executors.newScheduledThreadPool(10);
}
}
对于Asyncs,
@Configuration
@EnableAsync
public class AsyncConfig implements AsyncConfigurer {
@Override
public Executor getAsyncExecutor() {
ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
executor.setCorePoolSize(5);
executor.setMaxPoolSize(10);
executor.setQueueCapacity(100);
executor.initialize();
return executor;
}
@Override
public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
return new SimpleAsyncUncaughtExceptionHandler();
}
}
请注意@EnableAsync
和@EnableScheduling
必须在此处才能发挥作用。