示例代码基础框架
Event
import java.util.concurrent.atomic.AtomicInteger;
/**
* Disruptor中的 Event
*/
public class Trade {
private String id;
private String name;
private double price;
private AtomicInteger count = new AtomicInteger(0);
public Trade() {}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public AtomicInteger getCount() {
return count;
}
public void setCount(AtomicInteger count) {
this.count = count;
}
}
生产者
- 使用disruptor.publishEvent(eventTranslator)提交Event到容器中，区别于ringBuffer.publish(sequence)；
- disruptor.publishEvent(eventTranslator)的参数是com.lmax.disruptor.EventTranslator的实现类，其提供了一个Event的空对象，具体实现将填充空Event对象，完成Event的生产；
import java.util.Random;
import java.util.concurrent.CountDownLatch;
import com.lmax.disruptor.EventTranslator;
import com.lmax.disruptor.dsl.Disruptor;
public class TradePushlisher implements Runnable {
private Disruptor disruptor;
private CountDownLatch latch;
private static int PUBLISH_COUNT = 1;
public TradePushlisher(CountDownLatch latch, Disruptor disruptor) {
this.disruptor = disruptor;
this.latch = latch;
}
public void run() {
TradeEventTranslator eventTranslator = new TradeEventTranslator();
for(int i =0; i < PUBLISH_COUNT; i ++){
//新的提交任务的方式
disruptor.publishEvent(eventTranslator);
}
latch.countDown();
}
}
class TradeEventTranslator implements EventTranslator {
private Random random = new Random();
public void translateTo(Trade event, long sequence) {
this.generateTrade(event);
}
private void generateTrade(Trade event) {
event.setPrice(random.nextDouble() * 9999);
}
}
消费者
注：消费者既可以通过实现EventHandler成为消费者，也可以通过实现WorkHandler成为消费者；
- 消费者1：重置Event的name；
import com.lmax.disruptor.EventHandler;
import com.lmax.disruptor.WorkHandler;
public class Handler1 implements EventHandler, WorkHandler{
//EventHandler
public void onEvent(Trade event, long sequence, boolean endOfBatch) throws Exception {
this.onEvent(event);
}
//WorkHandler
public void onEvent(Trade event) throws Exception {
System.err.println("handler 1 : SET NAME");
Thread.sleep(1000);
event.setName("H1");
}
}
- 消费者2：设置ID
import java.util.UUID;
import com.lmax.disruptor.EventHandler;
public class Handler2 implements EventHandler {
public void onEvent(Trade event, long sequence, boolean endOfBatch) throws Exception {
System.err.println("handler 2 : SET ID");
Thread.sleep(2000);
event.setId(UUID.randomUUID().toString());
}
}
- 消费者3：输出Event信息
import com.lmax.disruptor.EventHandler;
public class Handler3 implements EventHandler {
public void onEvent(Trade event, long sequence, boolean endOfBatch) throws Exception {
System.err.println("handler 3 : NAME: "
+ event.getName()
+ ", ID: "
+ event.getId()
+ ", PRICE: "
+ event.getPrice()
+ " INSTANCE : " + event.toString());
}
}
- 消费者4：设置Event价格；
import com.lmax.disruptor.EventHandler;
public class Handler4 implements EventHandler {
public void onEvent(Trade event, long sequence, boolean endOfBatch) throws Exception {
System.err.println("handler 4 : SET PRICE");
Thread.sleep(1000);
event.setPrice(17.0);
}
}
- 消费者5：原价格基础上加3；
import com.lmax.disruptor.EventHandler;
public class Handler5 implements EventHandler {
public void onEvent(Trade event, long sequence, boolean endOfBatch) throws Exception {
System.err.println("handler 5 : GET PRICE: " + event.getPrice());
Thread.sleep(1000);
event.setPrice(event.getPrice() + 3.0);
}
}
六边形消费示例
- 生产者作为六边形“最左边”的点，生产消息；
- h1和h4并行执行，h1和h2串行执行，h4和h5串行执行，h3在h2和h5都执行完了再执行；
- 先在disruptor中把消费者“编排”好，等生产者把消息（Event）丢到RingBuffer中，“编排”好的消费者就开始工作，串行的串行，并行的并行；
注意1：在单生产者单消费者模式下，有几个消费者，在初始化disruptor的时候，用于初始化disruptor的线程池中就得有几个线程；
注意2：多个消费者拿到的Event，是同一个实例；
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import com.lmax.disruptor.BusySpinWaitStrategy;
import com.lmax.disruptor.EventFactory;
import com.lmax.disruptor.RingBuffer;
import com.lmax.disruptor.dsl.Disruptor;
import com.lmax.disruptor.dsl.EventHandlerGroup;
import com.lmax.disruptor.dsl.ProducerType;
public class Main {
@SuppressWarnings("unchecked")
public static void main(String[] args) throws Exception {
//构建一个线程池用于提交任务
ExecutorService es1 = Executors.newFixedThreadPool(1);
ExecutorService es2 = Executors.newFixedThreadPool(5);
//1 构建Disruptor
Disruptor disruptor = new Disruptor(
new EventFactory() {
public Trade newInstance() {
return new Trade();
}
},
1024*1024,
es2,
ProducerType.SINGLE,
new BusySpinWaitStrategy());
//2 把消费者设置到Disruptor中 handleEventsWith
//2.4 六边形操作
Handler1 h1 = new Handler1();
Handler2 h2 = new Handler2();
Handler3 h3 = new Handler3();
Handler4 h4 = new Handler4();
Handler5 h5 = new Handler5();
disruptor.handleEventsWith(h1, h4);
disruptor.after(h1).handleEventsWith(h2);
disruptor.after(h4).handleEventsWith(h5);
disruptor.after(h2, h5).handleEventsWith(h3);
//3 启动disruptor
RingBuffer ringBuffer = disruptor.start();
CountDownLatch latch = new CountDownLatch(1);
long begin = System.currentTimeMillis();
es1.submit(new TradePushlisher(latch, disruptor));
latch.await(); //进行向下
disruptor.shutdown();
es1.shutdown();
es2.shutdown();
System.err.println("总耗时: " + (System.currentTimeMillis() - begin));
}
}
输出：
handler 4 : SET PRICE
handler 1 : SET NAME
handler 2 : SET ID
handler 5 : GET PRICE: 17.0
handler 3 : NAME: H1, ID: c1ab2b33-c032-433e-8715-a8e1713a944e, PRICE: 20.0 INSTANCE : com.bfxy.disruptor.heigh.chain.Trade@1f818572
总耗时: 4659