构建Disruptor实例-生产消费模型完成整个入门示例

1、初始化Disruptor，构建Disruptor只要需要以下几个参数

    1 eventFactory: 消息(event)工厂对象

    2 ringBufferSize: 容器的长度

    3 executor: 线程池(建议使用自定义线程池) RejectedExecutionHandler

    4 ProducerType: 单生产者 还是 多生产者

    5 waitStrategy: 等待策略

示例代码：

Disruptor<OrderEvent> disruptor = new Disruptor<>(orderEventFactory,
        ringBufferSize,
        executor,
        ProducerType.SINGLE,
        new BlockingWaitStrategy());

2、初始化好Disruptor之后，通过该对象的handleEventsWith添加消费者的监听

3、然后启动Disruptor实例

4、往RingBuffer中生产数据，完成生产消费模型

具体代码如下：

package com656463.quickstart;

import java.nio.ByteBuffer;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import com.lmax.disruptor.BlockingWaitStrategy;
import com.lmax.disruptor.RingBuffer;
import com.lmax.disruptor.dsl.Disruptor;
import com.lmax.disruptor.dsl.ProducerType;

public class Main {
    public static void main(String[] args) {
        // 参数准备工作
        OrderEventFactory orderEventFactory = new OrderEventFactory();
        int ringBufferSize = 4;
        ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

        /**
         * 1 eventFactory: 消息(event)工厂对象
         * 2 ringBufferSize: 容器的长度
         * 3 executor: 线程池(建议使用自定义线程池) RejectedExecutionHandler
         * 4 ProducerType: 单生产者 还是 多生产者
         * 5 waitStrategy: 等待策略
         */
        //1. 实例化disruptor对象
        Disruptor<OrderEvent> disruptor = new Disruptor<>(orderEventFactory,
                ringBufferSize,
                executor,
                ProducerType.SINGLE,
                new BlockingWaitStrategy());

        //2. 添加消费者的监听 (构建disruptor 与 消费者的一个关联关系)
        disruptor.handleEventsWith(new OrderEventHandler());

        //3. 启动disruptor
        disruptor.start();

        //4. 获取实际存储数据的容器: RingBuffer
        RingBuffer<OrderEvent> ringBuffer = disruptor.getRingBuffer();
        OrderEventProducer producer = new OrderEventProducer(ringBuffer);

        ByteBuffer bb = ByteBuffer.allocate(8);
        for (long i = 0; i < 5; i++) {
            bb.putLong(0, i);
            producer.sendData(bb);
        }

        disruptor.shutdown();
        executor.shutdown();

    }
}

整个Disruptor的入门程序完成，接下来深入理解Disruptor核心API