无锁并发框架-Disruptor的使用（二）-白红宇

无锁并发框架-Disruptor的使用（二）

阅读量：379 次

发布时间：2019-03-05

本文共 4479 字，大约阅读时间需要 14 分钟。

文章目录

1、生产消费模型的应用

1.1、引入依赖


   	
    
     com.lmax
    	
    
     disruptor
    	
    
     3.2.1
    
   
   	
    
     org.projectlombok
    	
    
     lombok
    	
    
     1.18.8
    	
    
     true

1.2、定义Event

package com.zhz.disruptor.event;import lombok.Data;/** * @author ：zhz * @date ：Created in 2020/12/30 * @version: V1.0 * @slogan: 天下风云出我辈，一入代码岁月催 * @description: 定义事件event 通过Disruptor 进行交换的数据类型。 **/@Datapublic class LongEvent {       private Long value;}

1.3、定义EventFactory

package com.zhz.disruptor.event;import com.lmax.disruptor.EventFactory;/** * @author ：zhz * @date ：Created in 2020/12/30 * @version: V1.0 * @slogan: 天下风云出我辈，一入代码岁月催 * @description: 定义事件工厂 **/public class LongEventFactory implements EventFactory
   
     {       @Override    public LongEvent newInstance() {           return new LongEvent();    }}

1.4、定义事件消费者

package com.zhz.disruptor;import com.lmax.disruptor.EventHandler;import com.zhz.disruptor.event.LongEvent;import lombok.extern.slf4j.Slf4j;/** * @author ：zhz * @date ：Created in 2020/12/30 * @version: V1.0 * @slogan: 天下风云出我辈，一入代码岁月催 * @description: 事件消费者 **/@Slf4jpublic class LongEventHandler implements EventHandler
   
     {       private long serial = 0;    public LongEventHandler(long serial){           this.serial = serial;    }    @Override    public void onEvent(LongEvent event, long sequence, boolean endOfBatch) throws Exception {           log.info("消费者-{}:{}",this.serial,event.getValue());    }}

1.5、定义生产者

package com.zhz.disruptor;import com.lmax.disruptor.RingBuffer;import com.zhz.disruptor.event.LongEvent;import lombok.extern.slf4j.Slf4j;import java.nio.ByteBuffer;/** * @author ：zhz * @date ：Created in 2020/12/30 * @version: V1.0 * @slogan: 天下风云出我辈，一入代码岁月催 * @description: 事件生产者 **/@Slf4jpublic class LongEventProducer {       public final RingBuffer
   
     ringBuffer;    public LongEventProducer(RingBuffer
    
      ringBuffer) {           this.ringBuffer = ringBuffer;    }    public void onData(ByteBuffer byteBuffer) {           // 1.ringBuffer 事件队列 下一个槽        long sequence = ringBuffer.next();        Long data = null;        try {               //2.取出空的事件队列            LongEvent event = ringBuffer.get(sequence);            //3.获取事件队列传递的数据            data = byteBuffer.getLong(0);            event.setValue(data);            try {                   Thread.sleep(10);            } catch (InterruptedException e) {                   e.printStackTrace();            }        } finally {               log.info("生产者准备发送数据");            //4.发布事件,            //注意，最后的 ringBuffer.publish 方法必须包含在 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它的 producer。            ringBuffer.publish(sequence);        }    }}

1.6、定义Main入口

package com.zhz.disruptor;import com.lmax.disruptor.EventFactory;import com.lmax.disruptor.RingBuffer;import com.lmax.disruptor.YieldingWaitStrategy;import com.lmax.disruptor.dsl.Disruptor;import com.lmax.disruptor.dsl.ProducerType;import com.zhz.disruptor.event.LongEvent;import com.zhz.disruptor.event.LongEventFactory;import java.nio.ByteBuffer;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;/** * @author ：zhz * @date ：Created in 2020/12/30 * @version: V1.0 * @slogan: 天下风云出我辈，一入代码岁月催 * @description: **/public class DisruptorMain {       public static void main(String[] args) {           // 1.创建一个可缓存的线程 提供线程来出发Consumer 的事件处理        ExecutorService executor = Executors.newCachedThreadPool();        // 2.创建工厂        EventFactory eventFactory = new LongEventFactory();        // 3.创建ringBuffer 大小,ringBufferSize大小一定要是2的N次方        int ringBufferSize = 1024;        // 4.创建Disruptor        Disruptor
   
     disruptor = new Disruptor
    
     (eventFactory, ringBufferSize, executor, ProducerType.SINGLE, new YieldingWaitStrategy());        // 5.连接消费端方法        disruptor.handleEventsWith(new LongEventHandler(1),new LongEventHandler(2));        // 6.启动        disruptor.start();        // 7.创建RingBuffer容器        RingBuffer
     
       ringBuffer = disruptor.getRingBuffer();        // 8.创建生产者        LongEventProducer producer = new LongEventProducer(ringBuffer);        // 9.指定缓冲区大小        ByteBuffer byteBuffer = ByteBuffer.allocate(8);        for (int i = 1; i <= 10; i++) {               byteBuffer.putLong(0,i);            producer.onData(byteBuffer);        }        //10.关闭disruptor和executor        disruptor.shutdown();        executor.shutdown();    }}