Overview and use of Disruptor

Overview

1. Disruptor

Disruptor is a High-performance asynchronous processing framework, a "producer-consumer" model.

2.RingBuffer

RingBuffer is a ring data structure that contains a sequence number pointing to the next slot and can be passed between threads data.

3.Event

In the Disruptor framework, the data produced by the producer is called Event.

2 The basic composition of the Disruptor framework

1.MyEvent: Custom object, acting as data in the "producer-consumer" model.
2.MyEventFactory: Implements the interface of EventFactory and is used to produce data.
3.MyEventProducerWithTranslator: Store data in a custom object and publish it.
4.MyEventHandler: Custom consumer.

三Demo

When I first came into contact with Disruptor, my understanding was superficial, scattered and vague. I will write down a simple example here so that I can go deeper in the future. Research.

1. Customized data class

package com.disruptor.basic;public class LongEvent {private long value;public long getValue() {return value;
    }public void setValue(long value) {this.value = value;
    }

}

2. Data production factory (create Data class object)

package com.disruptor.basic;import com.lmax.disruptor.EventFactory;public class LongEventFactory implements EventFactory<LongEvent> {public LongEvent newInstance() {// TODO Auto-generated method stubreturn new LongEvent();
    }

}

3. Data source (initialize data object and publish)

package com.disruptor.basic;import java.nio.ByteBuffer;import com.lmax.disruptor.EventTranslatorOneArg;import com.lmax.disruptor.RingBuffer;public class LongEventProducerWithTranslator {private final RingBuffer<LongEvent> ringBuffer;public LongEventProducerWithTranslator(RingBuffer<LongEvent> ringBuffer) {this.ringBuffer = ringBuffer;
    }private final EventTranslatorOneArg<LongEvent, ByteBuffer> TRANSLATOR = new EventTranslatorOneArg<LongEvent, ByteBuffer>() {/** * event：包含有消费数据的对象； sequence：分配给目标对象的RingBuffer空间序号；
         * bb：包含有将要被存储到目标对象中的数据的容器         */public void translateTo(LongEvent event, long sequence, ByteBuffer bb) {// TODO Auto-generated method stubevent.setValue(bb.getLong(0));// 将数据存储到目标对象中        }
    };public void onData(ByteBuffer bb) {
        ringBuffer.publishEvent(TRANSLATOR, bb);// 发布，将数据推送给消费者    }

}

4. Consumer

package com.disruptor.basic;import com.lmax.disruptor.EventHandler;public class LongEventHandler implements EventHandler<LongEvent> {public void onEvent(LongEvent event, long sequence, boolean endOfBatch) throws Exception {// TODO Auto-generated method stubSystem.out.println("当前消费的数据="+event.getValue());
    }

}

5. Test class

package com.disruptor.basic;import java.nio.ByteBuffer;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import org.junit.Test;import com.lmax.disruptor.EventFactory;import com.lmax.disruptor.RingBuffer;import com.lmax.disruptor.YieldingWaitStrategy;import com.lmax.disruptor.dsl.Disruptor;import com.lmax.disruptor.dsl.ProducerType;public class LongEventTest {

    @SuppressWarnings({ "unchecked", "deprecation" })
    @Testpublic void test01() throws InterruptedException {
        ExecutorService executor = Executors.newCachedThreadPool();
        EventFactory<LongEvent> factory = new LongEventFactory();int bufferSize = 1024;
        Disruptor<LongEvent> disruptor = new Disruptor<LongEvent>(factory, bufferSize, executor, ProducerType.SINGLE,new YieldingWaitStrategy());
        disruptor.handleEventsWith(new LongEventHandler());
        disruptor.start();

        RingBuffer<LongEvent> ringBuffer = disruptor.getRingBuffer();// LongEventProducer producer = new// LongEventProducer(ringBuffer);LongEventProducerWithTranslator producer = new LongEventProducerWithTranslator(ringBuffer);
        ByteBuffer bb = ByteBuffer.allocate(8);// long startTime = System.currentTimeMillis();for (long a = 0; a < 100; a++) {
            bb.putLong(0, a);
            producer.onData(bb);/*if (a == 99) {
                long endTime = System.currentTimeMillis();
                System.out.println("useTime=" + (endTime - startTime));
            }*/Thread.sleep(100);
        }/*long endTime = System.currentTimeMillis();
        System.out.println("useTime=" + (endTime - startTime));*/disruptor.shutdown();
        executor.shutdown();
    }/*@Test
    public void test02() {
        long startTime = System.currentTimeMillis();
        for (long a = 0; a < 100; a++) {
            System.out.println(a);
        }
        long endTime = System.currentTimeMillis();
        System.out.println("useTime=" + (endTime - startTime));
    }*/}

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