SpringBoot下使用自定义监听事件的流程分析

import org.springframework.context.ApplicationEvent;
public class EmailEvent extends ApplicationEvent {
	private static final long serialVersionUID = 3733891603598996786L;
	private String emailAddress;
	public EmailEvent(String emailAddress) {
		super(emailAddress);
		this.emailAddress = emailAddress;
	}
	public String getEmailAddress() {
		return emailAddress;
	}
	public void setEmailAddress(String emailAddress) {
		this.emailAddress = emailAddress;
	}
}

import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.ApplicationListener;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;
@Component
public class EmailEventListener implements ApplicationListener<EmailEvent> {
	private static Logger log = LoggerFactory.getLogger(EmailEventListener.class);
	// 异步处理
	@Async
	@Override
	public void onApplicationEvent(EmailEvent event) {
		log.info("监听到事件--邮箱地址:" + event.getEmailAddress());
		//模拟处理的耗时3s
		try {
			TimeUnit.SECONDS.sleep(3);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		log.info("事件处理完成");
	}
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.stereotype.Component;
@Component
public class EmailEventPublish {
	@Autowired
	private ApplicationContext applicationContext;
	public void publishEvent(String emailAddress) {
		EmailEvent event = new EmailEvent(emailAddress);
		applicationContext.publishEvent(event);
	}
}

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.example.demo.event.EmailEventPublish;
@RestController
public class EventController {
	private static Logger log = LoggerFactory.getLogger(EventController.class);
	@Autowired
	private EmailEventPublish emailEventPublish;
	@RequestMapping("/event")
	public void publishEvent(@RequestParam String emailAddress) {
		// 发布事件 -- 采用异步处理
		emailEventPublish.publishEvent(emailAddress);
		// 正常该语句先执行
		log.info("Controller业务处理");
	}
}

http://localhost:8080/event?emailAddress=plf@163.com

import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.lang.Nullable;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;
@EnableAsync
@Configuration
public class ThreadPool implements AsyncConfigurer {
	@Nullable
	@Override
	@Bean("taskExecutor")
	public Executor getAsyncExecutor() {
		ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
		// 线程池创建时候初始化的线程数
		executor.setCorePoolSize(10);
		// 线程池最大的线程数，只有在缓冲队列满了之后才会申请超过核心线程数的线程
		executor.setMaxPoolSize(20);
		// 用来缓冲执行任务的队列
		executor.setQueueCapacity(200);
		// 允许线程的空闲时间60秒
		executor.setKeepAliveSeconds(60);
		// 线程池名的前缀
		executor.setThreadNamePrefix("taskExecutor-");
		// 线程池对拒绝任务的处理策略
		executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
		executor.initialize();
		return executor;
	}
	@Nullable
	@Override
	public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
		return null;
	}
}