disruptor简单示例

来源：互联网发布：ubuntu如何设置源编辑：程序博客网时间：2024/06/05 17:47

我们通过一个简单示例来演示disruptor的使用

1.生产者和消费者操作的数据

Person.java

========================

public class Person {
   private String name;
   private int age;
   private String gender;
   private String mobile;

   public Person(){}

   public Person(String name, int age, String gender, String mobile){
       this.name = name;
       this.age = age;
       this.gender = gender;
       this.mobile = mobile;
   }

   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public int getAge() {
       return age;
   }
   public void setAge(int age) {
       this.age = age;
   }
   public String getGender() {
       return gender;
   }
   public void setGender(String gender) {
       this.gender = gender;
   }
   public String getMobile() {
       return mobile;
   }
   public void setMobile(String mobile) {
       this.mobile = mobile;
   }


}

2.PersonEvent.java

========================

import com.lmax.disruptor.EventFactory;
/**
* 消费事件
*/
public class PersonEvent {

   private Person person;

   public Person getPerson() {
       return person;
   }

   public void setPerson(Person person) {
       this.person = person;
   }

   public final static EventFactory<PersonEvent> EVENT_FACTORY = new EventFactory<PersonEvent>(){
       public PersonEvent newInstance(){
           return new PersonEvent();
       }
   };
}

3.消费事件处理处理器

PersonEventHandler.java

========================

import com.lmax.disruptor.EventHandler;
/**
* 消费事件处理处理器
*/
public class PersonEventHandler implements EventHandler<PersonEvent>{

   public PersonEventHandler(){
//       DataSendHelper.start();
   }
   @Override
   public void onEvent(PersonEvent event, long sequence, boolean endOfBatch)
           throws Exception {
       Person person = event.getPerson();
        System.out.println("name = "+person.getName()+", age = "+ person.getAge()+", gender = "+ person.getGender() +", mobile = "+person.getMobile());
   }

}

4.ringbuffer的初始化

PersonHelper.java

========================

import com.lmax.disruptor.BatchEventProcessor;
import com.lmax.disruptor.RingBuffer;
import com.lmax.disruptor.SequenceBarrier;
import com.lmax.disruptor.SingleThreadedClaimStrategy;
import com.lmax.disruptor.YieldingWaitStrategy;

public class PersonHelper {
   private static PersonHelper instance;
   private static boolean inited = false;
   /**
   * ringBuffer的容量，必须是2的N次方
   */
   private static final int BUFFER_SIZE = 256;
   private RingBuffer<PersonEvent> ringBuffer;
   private SequenceBarrier sequenceBarrier;
   private PersonEventHandler handler;
   private BatchEventProcessor<PersonEvent> batchEventProcessor;

   public PersonHelper(){
       //参数1 事件
       //参数2 单线程使用
       //参数3 等待策略
       ringBuffer = new RingBuffer<PersonEvent>(PersonEvent.EVENT_FACTORY,
               new SingleThreadedClaimStrategy(BUFFER_SIZE), new YieldingWaitStrategy());
       //获取生产者的位置信息
       sequenceBarrier = ringBuffer.newBarrier();
       //消费者
       handler=new PersonEventHandler();
       //事件处理器，监控指定ringBuffer,有数据时通知指定handler进行处理
       batchEventProcessor = new BatchEventProcessor<PersonEvent>(ringBuffer, sequenceBarrier, handler);
       //传入所有消费者线程的序号
       ringBuffer.setGatingSequences(batchEventProcessor.getSequence());

   }

   /**
   * 启动消费者线程，实际上调用了AudioDataEventHandler中的onEvent方法进行处理
   */
   public static void start(){
       instance = new PersonHelper();
       Thread thread = new Thread(instance.batchEventProcessor);
       thread.start();
       inited = true;
   }
   /**
   * 停止
   */
   public static void shutdown(){
       if(!inited){
           throw new RuntimeException("EncodeHelper还没有初始化！");
       }else{
           instance.doHalt();
       }
   }
   private void doHalt() {
       batchEventProcessor.halt();
   }
   private void doProduce(Person person){
       //获取下一个序号
       long sequence = ringBuffer.next();
       //写入数据
       ringBuffer.get(sequence).setPerson(person);
       //通知消费者该资源可以消费了
       ringBuffer.publish(sequence);
   }
   /**
   * 生产者压入生产数据
   * @param data
   */
   public static void produce(Person person){
       if(!inited){
           throw new RuntimeException("EncodeHelper还没有初始化！");
       }else{
           instance.doProduce(person);
       }
   }

}

5. 主函数入口

public class Test {
   /**
   * @param args
   */
   public static void main(String[] args) {
       PersonHelper.start();
       for(int i=0 ; i<20; i++){
           Person p = new Person("jbgtwang"+i, i , "男", "1234566"+i);

            //生产者生产数据
           PersonHelper.produce(p);
       }
   }

}

====================================

要注意的：

1. 该示例在电脑上可以正常运行，在android上运行则Unsafe类报错。

网上有人说将disruptor中com.lmax.disruptor.util.Util类中反射调用Unsafe “theUnsafe”的地方改为"THE_ONE"，重新编译一下就可以用了

2. ringBuffer的容量，必须是2的N次方

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