SpringBoot + Springmvc集成guava

添加guava框架，实现异步处理。

一、添加依赖

<dependency>
    <groupId>com.google.guava</groupId>
    <artifactId>guava</artifactId>
    <version>18.0</version>
</dependency>

二、注册为组件Bean

import com.google.common.eventbus.AsyncEventBus;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * web 配置类
 *
 * @author Creator
 */
@Configuration
public class WebConfig implements WebMvcConfigurer {

    /**
     * AsyncEventBus注册
     */
    @Bean
    public AsyncEventBus asyncEventBus() {

        // 创建一个核心3线程，最大10线程的线程池，配置DiscardPolicy策略，抛弃当前任务
        ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(3,10,60, TimeUnit.SECONDS,new ArrayBlockingQueue<Runnable>(10),new ThreadPoolExecutor.DiscardPolicy());

        return new AsyncEventBus(threadPoolExecutor);
    }

}

 三、添加事件处理监听器

import com.google.common.eventbus.AsyncEventBus;
import com.google.common.eventbus.Subscribe;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import javax.annotation.PostConstruct;

/**
 * 异步监听处理器
 */
@Component
public class AsyncEventListener {

    /**
     * 日志
     */
    private final static Logger logger = LoggerFactory.getLogger(AsyncEventListener.class);

    @Autowired
    private AsyncEventBus asyncEventBus;

    @Autowired
    private ILoginLogService loginLogService;

    /**
     * 注册这个监听器
     */
    @PostConstruct
    public void register(){
        asyncEventBus.register(this);
    }

    /**
     * 具体业务处理(此处比如向库中添加登录日志)
     * sysLoginLogPO: 登录日志表对应实体(替换成自己的传参实体即可)
     */
    @Subscribe
    public void addLoginLog(SysLoginLogPO sysLoginLogPO) {

        logger.info("添加登录日志:sysLoginLogPO=" + sysLoginLogPO);

        // 执行具体添加日志操作
        loginLogService.insert(sysLoginLogPO);
    }

    /**
     * 其他需要异步的业务方法
     */
    @Subscribe
    public void XXX(XXXXPO xxxxpoPO) {

        logger.info("日志:xxxxpoPO=" + xxxxpoPO);

        // 执行具体添加日志操作 TODO
    }
}

四、业务层调用

    @Autowired
    private AsyncEventBus asyncEventBus;

    /**
     * 业务处理方法（业务封装）
     */
    public void doAddLoginLog(){

        SysLoginLogPO sysLoginLogPO = new SysLoginLogPO();

        // 提交异步处理, 会执行AsyncEventListener中的 addLoginLog 方法，根据参数类型匹配
        asyncEventBus.post(sysLoginLogPO);

    }

五、guava同spring集成

可以参考 https://blog.csdn.net/yxp20092010/article/details/46537333

注意：上面链接的这个文章实现出来的是默认的同步，如果需求要使用异步，那么参考如下修改：

EventBusAdapter extends EventBus   一定要改为继承 AsyncEventBus 类，

然后添加一个构造方法，如下：

public class EventBusAdapter extends AsyncEventBus implements InitializingBean {
 
    private List<EventAbstract> eventBusListener;
 
    // 默认构造方法
	public EventBusAdapter (Executor executor, List<EventAbstract> eventBusListener) {
		super(executor);
		this.eventBusListener = eventBusListener;
	}
 
    @Override
    public void afterPropertiesSet() throws Exception {
        for(EventAbstract eventAbstract : eventBusListener){
            this.register(eventAbstract);
        }
    }

}

spring配置修改：

<!-- spring thread pool executor -->           
<bean id="taskExecutor" class="org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor">
	<!-- 线程池维护线程的最少数量 -->
	<property name="corePoolSize" value="5" />
	<!-- 允许的空闲时间 -->
	<property name="keepAliveSeconds" value="200" />
	<!-- 线程池维护线程的最大数量 -->
	<property name="maxPoolSize" value="10" />
	<!-- 缓存队列 -->
	<property name="queueCapacity" value="20" />
	<!-- 对拒绝task的处理策略 -->
	<property name="rejectedExecutionHandler">
		<bean class="java.util.concurrent.ThreadPoolExecutor$CallerRunsPolicy" />
	</property>
</bean>


<!-- EventBusListener 定义 -->
<util:list id="eventBusListener" value-type="com.qyou.EventAbstract">
	<bean class="com.qyou.SendFailMailHandler "/>
	<bean class="com.qyou.SendSuccessSMSHandler "/>
</util:list>

<!-- EventBusAdapter适配器 -->
<bean id="eventBusAdapter" class="com.qyou..EventBusAdapter">
	<constructor-arg name="eventBusListener" ref="eventBusListener"/>
	<constructor-arg name="executor" ref="taskExecutor"/>
</bean>