disruptor 高效队列

disruptor 是什么: disruptor 是一个 低延时的 无锁 环形 队列.  相较于 java的 队列 ,他有明显的优点  ,无界,无锁,低延时(解决了为内存共享问题 ) disruptor 就一个 高效的生产者消费者队列.

EventHandler ,WorkHandler 区别 ,  WorkHandler  适用于 多个消费者 中的一个消费这个 消息, EventHandler  适用于 每个消费者都要处理一下这个消息.

package com.cxygg.test;

import java.util.concurrent.ThreadFactory;

import com.lmax.disruptor.BlockingWaitStrategy;
import com.lmax.disruptor.EventFactory;
import com.lmax.disruptor.EventHandler;
import com.lmax.disruptor.EventTranslatorOneArg;
import com.lmax.disruptor.ExceptionHandler;
import com.lmax.disruptor.RingBuffer;
import com.lmax.disruptor.WorkHandler;
import com.lmax.disruptor.dsl.Disruptor;
import com.lmax.disruptor.dsl.ProducerType;

public class DisruptorTest {
    /**
     * 消息事件类
     */
    public static class MessageEvent{
        /**
         * 原始消息
         */
        private String message;

        public String getMessage() {
            return message;
        }

        public void setMessage(String message) {
            this.message = message;
        }
    }

    /**
     * 消息事件工厂类
     */
    public static class MessageEventFactory implements EventFactory<MessageEvent>{
        @Override
        public MessageEvent newInstance() {
            return new MessageEvent();
        }
    }

    /**
     * 消息转换类，负责将消息转换为事件
     */
    public static class MessageEventTranslator implements EventTranslatorOneArg<MessageEvent,String> {
        @Override
        public void translateTo(MessageEvent messageEvent, long l, String s) {
            messageEvent.setMessage(s);
        }
    }

    /**
     * 消费者线程工厂类
     */
    public static class MessageThreadFactory implements ThreadFactory{
        @Override
        public Thread newThread(Runnable r) {
            return new Thread(r,"Simple Disruptor Test Thread");
        }
    }

    /**
     * 消息事件处理类，这里只打印消息
     */
    public static class MessageEventHandler1 implements WorkHandler<MessageEvent>{

		@Override
		public void onEvent(MessageEvent event) throws Exception {
			System.out.println("消费1:" + event.getMessage());
		}

    }
    /**
     * 消息事件处理类，这里只打印消息
     */
    public static class MessageEventHandler2 implements WorkHandler<MessageEvent>{
    	@Override
    	public void onEvent(MessageEvent messageEvent) throws Exception {
    		System.out.println("消费2:" + messageEvent.getMessage());
    	}
    }
    /**
     * 消息事件处理类，这里只打印消息
     */
    public static class MessageEventHandler3 implements WorkHandler<MessageEvent>{
    	@Override
    	public void onEvent(MessageEvent messageEvent) throws Exception {
    		System.out.println("消费3:" + messageEvent.getMessage());
    	}
    }

    /**
     * 异常处理类
     */
    public static class MessageExceptionHandler implements ExceptionHandler<MessageEvent>{
        @Override
        public void handleEventException(Throwable ex, long sequence, MessageEvent event) {
            ex.printStackTrace();
        }

        @Override
        public void handleOnStartException(Throwable ex) {
            ex.printStackTrace();

        }

        @Override
        public void handleOnShutdownException(Throwable ex) {
            ex.printStackTrace();

        }
    }

    /**
     * 消息生产者类
     */

    public static class MessageEventProducer{
        private RingBuffer<MessageEvent> ringBuffer;

        public MessageEventProducer(RingBuffer<MessageEvent> ringBuffer) {
            this.ringBuffer = ringBuffer;
        }

        /**
         * 将接收到的消息输出到ringBuffer
         * @param message
         */
        public void onData(String message){
            EventTranslatorOneArg<MessageEvent,String> translator = new MessageEventTranslator();
            ringBuffer.publishEvent(translator,message);
        }
    }

    public static void main(String[] args) {
        String message = "Hello Disruptor!";
        int ringBufferSize = 2;//必须是2的N次方
        Disruptor<MessageEvent> disruptor = new Disruptor<MessageEvent>(new MessageEventFactory(),ringBufferSize,new MessageThreadFactory(),ProducerType.SINGLE,new BlockingWaitStrategy());

        disruptor.handleEventsWithWorkerPool(new MessageEventHandler1(),new MessageEventHandler2()).thenHandleEventsWithWorkerPool( new MessageEventHandler3() );
        disruptor.handleEventsWithWorkerPool(new MessageEventHandler2(),new MessageEventHandler1()).thenHandleEventsWithWorkerPool( new MessageEventHandler3() );
        disruptor.setDefaultExceptionHandler(new MessageExceptionHandler());
        RingBuffer<MessageEvent> ringBuffer = disruptor.start();

        MessageEventProducer producer = new MessageEventProducer(ringBuffer);
        producer.onData( message +"");

    }
}

　　

参考:https://blog.csdn.net/twypx/article/details/80398886