一、前言
Disruptor是一个开源的Java框架，它被设计用于在生产者-消费者问题上获得尽量高的吞吐量和尽量低的延迟，从功能上来看Disruptor是实现了队列的功能，而且是一个有界队列。那么它的应用场景自然就是“生产者-消费者”模型的应用场合了。Disruptor 是在内存中以队列的方式去实现的，而且是无锁的。这也是 Disruptor 为什么高效的原因。
二、SpringBoot整合Disruptor
1.添加依赖
1 | com.lmaxdisruptor3.4.4org.projectlomboklombok |
2.创建消息体实体
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | package com.example.aopdemo.disruptor;import lombok.Data;/** * @author qx * @date 2024/2/21 * @des 消息体 */@Datapublic class MessageModel { private String message;} |
3.创建事件工厂类
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | package com.example.aopdemo.disruptor;import com.lmax.disruptor.EventFactory;/** * @author qx * @date 2024/2/21 * @des 事件工厂类 */public class MessageEventFactory implements EventFactory { @Override public MessageModel newInstance() { return new MessageModel(); }} |
4.创建消费者
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | package com.example.aopdemo.disruptor;import com.lmax.disruptor.EventHandler;import lombok.extern.slf4j.Slf4j;/** * @author qx * @date 2024/2/21 * @des 消息消费者 */@Slf4jpublic class MessageEventHandler implements EventHandler { @Override public void onEvent(MessageModel messageModel, long sequence, boolean endOfBatch) { log.info("消费者获取消息:{}", messageModel); }} |
5.构造BeanManager
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | package com.example.aopdemo.disruptor;import org.springframework.beans.BeansException;import org.springframework.context.ApplicationContext;import org.springframework.context.ApplicationContextAware;import org.springframework.stereotype.Component;/** * @author qx * @date 2024/2/21 * @des */@Componentpublic class BeanManager implements ApplicationContextAware { private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { BeanManager.applicationContext = applicationContext; } public static ApplicationContext getApplicationContext() { return applicationContext; } public static Object getBean(String name) { return applicationContext.getBean(name); } public static T getBean(Class clazz) { return applicationContext.getBean(clazz); }} |
6.创建消息管理器
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | package com.example.aopdemo.disruptor;import com.lmax.disruptor.BlockingWaitStrategy;import com.lmax.disruptor.RingBuffer;import com.lmax.disruptor.dsl.Disruptor;import com.lmax.disruptor.dsl.ProducerType;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;/** * @author qx * @date 2024/2/21 * @des 事件管理器 */@Configurationpublic class MessageManager { @Bean("messageModel") public RingBuffer messageModelRingBuffer() { // 定义线程池 ExecutorService executorService = Executors.newFixedThreadPool(2); // 指定事件工厂 MessageEventFactory factory = new MessageEventFactory(); // 指定ringbuffer字节大小，必须为2的N次方（能将求模运算转为位运算提高效率），否则将影响效率 int bufferSize = 1024 * 256; //单线程模式，获取额外的性能 Disruptor disruptor = new Disruptor(factory, bufferSize, executorService, ProducerType.SINGLE, new BlockingWaitStrategy()); //设置事件业务处理器---消费者 disruptor.handleEventsWith(new MessageEventHandler()); //启动disruptor线程 disruptor.start(); //获取ringbuffer环，用于接取生产者生产的事件 return disruptor.getRingBuffer(); }} |
7.创建生产者
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | package com.example.aopdemo.disruptor;import com.lmax.disruptor.RingBuffer;import lombok.extern.slf4j.Slf4j;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;/** * @author qx * @date 2024/2/21 * @des 生产者 */@Service@Slf4jpublic class DisruptorService { @Autowired private RingBuffer messageModelRingBuffer; public void sayMessage(String message) { // 获取下一个Event槽的下标 long sequence = messageModelRingBuffer.next(); try { // 填充数据 MessageModel messageModel = messageModelRingBuffer.get(sequence); messageModel.setMessage(message); log.info("往消息队列中添加消息:{}", messageModel); } catch (Exception e) { log.error("failed to add event to messageModelRingBuffer for : e = {},{}", e, e.getMessage()); } finally { //发布Event，激活观察者去消费，将sequence传递给改消费者 //注意最后的publish方法必须放在finally中以确保必须得到调用；如果某个请求的sequence未被提交将会堵塞后续的发布操作或者其他的producer messageModelRingBuffer.publish(sequence); } }} |
8.创建测试类
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | package com.example.aopdemo.controller;import com.example.aopdemo.disruptor.DisruptorService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;/** * @author qx * @date 2024/2/21 * @des Disruptor测试 */@RestControllerpublic class DisruptorController { @Autowired private DisruptorService disruptorService; @GetMapping("/disruptor") public String disruptorTest(String message) { disruptorService.sayMessage(message); return "发送消息成功"; }} |
9.测试
启动程序，在浏览器访问请求连接进行测试。
我们在控制台上可以获取到消息的发送和接收信息。
2024-02-21 15:22:16.059 INFO 6788 — [nio-8080-exec-1] c.e.aopdemo.disruptor.DisruptorService : 往消息队列中添加消息:MessageModel(message=hello)
2024-02-21 15:22:16.060 INFO 6788 — [pool-1-thread-1] c.e.a.disruptor.MessageEventHandler : 消费者获取消息:MessageModel(message=hello)
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