高性能的异步处理框架Disruptor(五)——Disruptor2.0的应用

朱雀 2023-06-08 12:59 231阅读 0赞

前文讲了那么多理论，原理。现在通过实际的代码，来看看Disruptor2.0的几种实际应用代码。

<dependency>
                <groupId>com.lmax</groupId>
                <artifactId>disruptor</artifactId>
                <version>3.4.0</version>
                <scope>test</scope>
            </dependency>

Event事件定义：

/**
     * Event，RingBuffer的数据 
     * @author wangxi
     * @date 2019-10-16 16:31
     */
    @Slf4j
    public class DisruptorEvent implements Serializable {
    
        Integer param;
    
        public void setParam(Integer i){
            this.param = param;
        }
    
        public void say(){
            log.info("i===>{},nowTime===>{}, nowThreadId===>{}", param, System.currentTimeMillis()+"", Thread.currentThread().getId()+"");
        }
    
    }

Event事件工厂

/**
     * @author wangxi
     * @date 2019-10-16 16:42
     */
    public class DisruptorEventFactory implements EventFactory<DisruptorEvent> {
    
        @Override
        public DisruptorEvent newInstance() {
            return new DisruptorEvent();
    
        }
    }

消费者EventHandler定义：

/**
     * 消费者
     * @author wangxi
     * @date 2019-10-16 16:55
     */
    public class DisruptorEventHandler implements WorkHandler<DisruptorEvent> {
    
        @Override
        public void onEvent(DisruptorEvent disruptorEvent) throws Exception {
    
            disruptorEvent.say();
        }
    }

Publisher 生产者和Disruptor的启动

public class DisruptorPublisher {
    
        private static final AtomicLong INDEX = new AtomicLong(1);
        private Disruptor<DisruptorEvent> disruptor;
    
        //开启
        public void start(final int bufferSize, final int threadSize){
    
            ThreadFactory threadFactory = runnable ->
                new Thread(new ThreadGroup("disruptor"), runnable,
                        "disruptor-thread-" + INDEX.getAndIncrement());
    
            //ProducerType.MULTI 多生产者
            disruptor = new Disruptor<>(new DisruptorEventFactory(), bufferSize, threadFactory, ProducerType.MULTI, new BlockingWaitStrategy());
    
    
            DisruptorEventHandler[] consumers = new DisruptorEventHandler[threadSize];
            for (int i = 0; i < threadSize; i++) {
                consumers[i] = new DisruptorEventHandler();
            }
    
            disruptor.handleEventsWithWorkerPool(consumers);
       /**
         如上是仅存在单个DisruptorEventHandler 的情况，如果存在一个如前文所属的菱形结构。存在DisruptorEventHandler[] a，DisruptorEventHandler[] b, DisruptorEventHandler[] c。c依赖a和b
       则如下的结构：
      disruptor.handleEventsWithWorkerPool(a).handleEventsWithWorkerPool(b).thenHandleEventsWithWorkerPool(consumerThree);
    如果 c 依赖 b，b依赖a
    disruptor.handleEventsWithWorkerPool(a).thenhandleEventsWithWorkerPool(b).thenHandleEventsWithWorkerPool(consumerThree);
    **/
            
            disruptor.setDefaultExceptionHandler(new IgnoreExceptionHandler());
            disruptor.start();
        }
    
        public static void main(String[] args){
    
            DisruptorPublisher disruptorPublisher = new DisruptorPublisher();
            disruptorPublisher.start(2*2*2*2*2, 10);
    
            RingBuffer<DisruptorEvent> ringBuffer = disruptorPublisher.disruptor.getRingBuffer();
    
            for(int i =0;i<100;i++) {
    
                ringBuffer.publishEvent(new EventTranslatorOneArg<DisruptorEvent, Integer>() {
    
                    /**
                     * 该回调运行于主线程
                     * @param o 由DisruptorEventFactory产生的
                     * @param l 统计，记录回掉的第几个Event
                     * @param o2 publishEvent 第二个参数回填这里
                     */
                    @Override
                    public void translateTo(DisruptorEvent o, long l, Integer o2) {
                        //设置Event的参数
                        o.setParam(o2);
                    }
                }, i);
    
            }
    
        }
    }

对于菱形的依赖结构的实现如下：

DisruptorEventHandlerOne[] consumerOne = new DisruptorEventHandlerOne[threadSize];
            DisruptorEventHandlerTwo[] consumerTwo = new DisruptorEventHandlerTwo[threadSize];
            DisruptorEventHandlerThree[] consumerThree = new DisruptorEventHandlerThree[threadSize];
    
            for (int i = 0; i < threadSize; i++) {
    
                consumerOne[i] = new DisruptorEventHandlerOne();
                consumerTwo[i] = new DisruptorEventHandlerTwo();
                consumerThree[i] = new DisruptorEventHandlerThree();
            }
            
    disruptor.handleEventsWithWorkerPool(consumerOne).handleEventsWithWorkerPool(consumerTwo).thenHandleEventsWithWorkerPool(consumerThree);