Spr9341.java

/*
 * Copyright 2002-2012 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.scheduling;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.annotation.SchedulingConfigurer;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.config.ScheduledTaskRegistrar;

/**
 * Demonstrates using daemon threads to allow a standalone app with scheduled tasks to
 * shut down properly.
 *
 * See https://jira.springsource.org/browse/SPR-9341
 *
 * @author Chris Beams
 */
public class Spr9341 {

	public static void main(String... args) {
		AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
		ctx.register(Config.class);
		ctx.refresh();
		ctx.registerShutdownHook();
	}
}

@Configuration
@EnableScheduling
class Config implements SchedulingConfigurer {
	@Bean
	public ScheduledBean scheduledBean() {
		return new ScheduledBean();
	}

	@Bean
	public TaskScheduler taskScheduler() {
		ThreadPoolTaskScheduler taskScheduler = new ThreadPoolTaskScheduler();
		taskScheduler.setDaemon(true);
		return taskScheduler;
	}

	@Override
	public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
		taskRegistrar.setTaskScheduler(taskScheduler());
	}
}

class ScheduledBean {
	@Scheduled(fixedRate=1000)
	void hello() {
		System.out.println("hello");
	}
}