Spring Boot 自动配置之 TaskScheduler

TaskScheduler 是什么？

TaskScheduler 是 Spring 的轻量级调度器，适合单机、轻量、简单的定时/周期任务。

典型场景：缓存清理、心跳检测、延迟任务、动态调度。

不适合：分布式唯一执行、大规模调度、需要持久化的任务。

Spring Boot 自动配置类

所在包：org.springframework.boot.autoconfigure.task

类名：TaskSchedulingAutoConfiguration

package org.springframework.boot.autoconfigure.task;

import org.springframework.boot.LazyInitializationExcludeFilter;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Import;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.config.TaskManagementConfigUtils;

/**
 * {@link EnableAutoConfiguration Auto-configuration} for {@link TaskScheduler}.
 *
 * @author Stephane Nicoll
 * @author Moritz Halbritter
 * @since 2.1.0
 */
@ConditionalOnClass(ThreadPoolTaskScheduler.class)
@AutoConfiguration(after = TaskExecutionAutoConfiguration.class)
@EnableConfigurationProperties(TaskSchedulingProperties.class)
@Import({ TaskSchedulingConfigurations.ThreadPoolTaskSchedulerBuilderConfiguration.class,
		TaskSchedulingConfigurations.SimpleAsyncTaskSchedulerBuilderConfiguration.class,
		TaskSchedulingConfigurations.TaskSchedulerConfiguration.class })
public class TaskSchedulin