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BAEL-519 Introduction to LMAX Disruptor (#948) 

* BAL-36 File size api in java and apache commons IO

* BAEL-282 grep in java - fixes after code review

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor library

* BAEL-519 Added support for disruptor

* BAEL-519 Moved all supporting classes to main source

* BAEL-519 Moved all supporting classes to main source

* BAEL-519 Moved asserts and test classes in test folder.

* BAEL-519 moved test related producer and consumer to src.

* BAEL-586 Guide to Guava BiMap.

* BAEL-587 formatted code.

* BAEL-519 LMAX Disruptor

* BAEL-587 resolved merge

* BAEL-587 Resolved merge

* BAEL-519 Removed disruptor link.

* BAEL-519 Reverted Guava changes
This commit is contained in:
Muhammed Almas 2017-01-16 00:18:42 +05:30 committed by Grzegorz Piwowarek
parent d8af6f371b
commit a8d61e77dd
12 changed files with 293 additions and 1 deletions
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2
core-java/README.md
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@ -52,4 +52,4 @@
- [URL Encoding and Decoding in Java](http://www.baeldung.com/java-url-encoding-decoding)
- [Calculate the Size of a File in Java](http://www.baeldung.com/java-file-size)
- [The Basics of Java Generics](http://www.baeldung.com/java-generics)
- [The Traveling Salesman Problem in Java](http://www.baeldung.com/java-simulated-annealing-for-traveling-salesman)
- [The Traveling Salesman Problem in Java](http://www.baeldung.com/java-simulated-annealing-for-traveling-salesman)

7
core-java/pom.xml
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@ -63,6 +63,12 @@
<artifactId>grep4j</artifactId>
<version>${grep4j.version}</version>
</dependency>
<dependency>
<groupId>com.lmax</groupId>
<artifactId>disruptor</artifactId>
<version>${disruptor.version}</version>
</dependency>
<!-- web -->
<!-- marshalling -->
@ -363,6 +369,7 @@
<unix4j.version>0.4</unix4j.version>
<grep4j.version>1.8.7</grep4j.version>
<lombok.version>1.16.12</lombok.version>
<disruptor.version>3.3.6</disruptor.version>
<!-- testing -->
<org.hamcrest.version>1.3</org.hamcrest.version>

34
core-java/src/main/java/com/baeldung/disruptor/DelayedMultiEventProducer.java Normal file
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@ -0,0 +1,34 @@
package com.baeldung.disruptor;
import com.lmax.disruptor.RingBuffer;
public class DelayedMultiEventProducer implements EventProducer {
@Override
public void startProducing(final RingBuffer<ValueEvent> ringBuffer, final int count) {
final Runnable simpleProducer = () -> produce(ringBuffer, count, false);
final Runnable delayedProducer = () -> produce(ringBuffer, count, true);
new Thread(simpleProducer).start();
new Thread(delayedProducer).start();
}
private void produce(final RingBuffer<ValueEvent> ringBuffer, final int count, final boolean addDelay) {
for (int i = 0; i < count; i++) {
final long seq = ringBuffer.next();
final ValueEvent valueEvent = ringBuffer.get(seq);
valueEvent.setValue(i);
ringBuffer.publish(seq);
if (addDelay) {
addDelay();
}
}
}
private void addDelay() {
try {
Thread.sleep(1000);
} catch (InterruptedException interruptedException) {
// No-Op lets swallow it
}
}
}

13
core-java/src/main/java/com/baeldung/disruptor/EventConsumer.java Normal file
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@ -0,0 +1,13 @@
package com.baeldung.disruptor;
import com.lmax.disruptor.EventHandler;
/**
* Consumer that consumes event from ring buffer.
*/
public interface EventConsumer {
/**
* One or more event handler to handle event from ring buffer.
*/
public EventHandler<ValueEvent>[] getEventHandler();
}

15
core-java/src/main/java/com/baeldung/disruptor/EventProducer.java Normal file
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@ -0,0 +1,15 @@
package com.baeldung.disruptor;
import com.lmax.disruptor.RingBuffer;
/**
* Producer that produces event for ring buffer.
*/
public interface EventProducer {
/**
* Start the producer that would start producing the values.
* @param ringBuffer
* @param count
*/
public void startProducing(final RingBuffer<ValueEvent> ringBuffer, final int count);
}

23
core-java/src/main/java/com/baeldung/disruptor/MultiEventPrintConsumer.java Normal file
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@ -0,0 +1,23 @@
package com.baeldung.disruptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.lmax.disruptor.EventHandler;
public class MultiEventPrintConsumer implements EventConsumer {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
@Override
@SuppressWarnings("unchecked")
public EventHandler<ValueEvent>[] getEventHandler() {
final EventHandler<ValueEvent> eventHandler = (event, sequence, endOfBatch) -> print(event.getValue(), sequence);
final EventHandler<ValueEvent> otherEventHandler = (event, sequence, endOfBatch) -> print(event.getValue(), sequence);
return new EventHandler[] { eventHandler, otherEventHandler };
}
private void print(final int id, final long sequenceId) {
logger.info("Id is " + id + " sequence id that was used is " + sequenceId);
}
}

22
core-java/src/main/java/com/baeldung/disruptor/SingleEventPrintConsumer.java Normal file
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@ -0,0 +1,22 @@
package com.baeldung.disruptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.lmax.disruptor.EventHandler;
public class SingleEventPrintConsumer implements EventConsumer {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
@Override
@SuppressWarnings("unchecked")
public EventHandler<ValueEvent>[] getEventHandler() {
final EventHandler<ValueEvent> eventHandler = (event, sequence, endOfBatch) -> print(event.getValue(), sequence);
return new EventHandler[] { eventHandler };
}
private void print(final int id, final long sequenceId) {
logger.info("Id is " + id + " sequence id that was used is " + sequenceId);
}
}

22
core-java/src/main/java/com/baeldung/disruptor/SingleEventProducer.java Normal file
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@ -0,0 +1,22 @@
package com.baeldung.disruptor;
import com.lmax.disruptor.RingBuffer;
public class SingleEventProducer implements EventProducer {
@Override
public void startProducing(RingBuffer<ValueEvent> ringBuffer, int count) {
final Runnable producer = () -> produce(ringBuffer, count);
new Thread(producer).start();
}
private void produce(final RingBuffer<ValueEvent> ringBuffer, final int count) {
for (int i = 0; i < count; i++) {
final long seq = ringBuffer.next();
final ValueEvent valueEvent = ringBuffer.get(seq);
valueEvent.setValue(i);
ringBuffer.publish(seq);
}
}
}

25
core-java/src/main/java/com/baeldung/disruptor/ValueEvent.java Normal file
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@ -0,0 +1,25 @@
package com.baeldung.disruptor;
import org.apache.commons.lang3.builder.ToStringBuilder;
import com.lmax.disruptor.EventFactory;
public final class ValueEvent {
private int value;
public int getValue() {
return value;
}
public void setValue(int value) {
this.value = value;
}
public final static EventFactory<ValueEvent> EVENT_FACTORY = () -> new ValueEvent();
@Override
public String toString() {
return ToStringBuilder.reflectionToString(this);
}
}

83
core-java/src/test/java/com/baeldung/disruptor/DisruptorTest.java Normal file
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@ -0,0 +1,83 @@
package com.baeldung.disruptor;
import java.util.concurrent.ThreadFactory;
import org.junit.Before;
import org.junit.Test;
import com.lmax.disruptor.BusySpinWaitStrategy;
import com.lmax.disruptor.RingBuffer;
import com.lmax.disruptor.WaitStrategy;
import com.lmax.disruptor.dsl.Disruptor;
import com.lmax.disruptor.dsl.ProducerType;
import com.lmax.disruptor.util.DaemonThreadFactory;
public class DisruptorTest {
private Disruptor<ValueEvent> disruptor;
private WaitStrategy waitStrategy;
@Before
public void setUp() throws Exception {
waitStrategy = new BusySpinWaitStrategy();
}
private void createDisruptor(final ProducerType producerType, final EventConsumer eventConsumer) {
final ThreadFactory threadFactory = DaemonThreadFactory.INSTANCE;
disruptor = new Disruptor<ValueEvent>(ValueEvent.EVENT_FACTORY, 16, threadFactory, producerType, waitStrategy);
disruptor.handleEventsWith(eventConsumer.getEventHandler());
}
private void startProducing(final RingBuffer<ValueEvent> ringBuffer, final int count, final EventProducer eventProducer) {
eventProducer.startProducing(ringBuffer, count);
}
@Test
public void whenMultipleProducerSingleConsumer_thenOutputInFifoOrder() {
final EventConsumer eventConsumer = new SingleEventPrintConsumer();
final EventProducer eventProducer = new DelayedMultiEventProducer();
createDisruptor(ProducerType.MULTI, eventConsumer);
final RingBuffer<ValueEvent> ringBuffer = disruptor.start();
startProducing(ringBuffer, 32, eventProducer);
disruptor.halt();
disruptor.shutdown();
}
@Test
public void whenSingleProducerSingleConsumer_thenOutputInFifoOrder() {
final EventConsumer eventConsumer = new SingleEventConsumer();
final EventProducer eventProducer = new SingleEventProducer();
createDisruptor(ProducerType.SINGLE, eventConsumer);
final RingBuffer<ValueEvent> ringBuffer = disruptor.start();
startProducing(ringBuffer, 32, eventProducer);
disruptor.halt();
disruptor.shutdown();
}
@Test
public void whenSingleProducerMultipleConsumer_thenOutputInFifoOrder() {
final EventConsumer eventConsumer = new MultiEventConsumer();
final EventProducer eventProducer = new SingleEventProducer();
createDisruptor(ProducerType.SINGLE, eventConsumer);
final RingBuffer<ValueEvent> ringBuffer = disruptor.start();
startProducing(ringBuffer, 32, eventProducer);
disruptor.halt();
disruptor.shutdown();
}
@Test
public void whenMultipleProducerMultipleConsumer_thenOutputInFifoOrder() {
final EventConsumer eventConsumer = new MultiEventPrintConsumer();
final EventProducer eventProducer = new DelayedMultiEventProducer();
createDisruptor(ProducerType.MULTI, eventConsumer);
final RingBuffer<ValueEvent> ringBuffer = disruptor.start();
startProducing(ringBuffer, 32, eventProducer);
disruptor.halt();
disruptor.shutdown();
}
}

27
core-java/src/test/java/com/baeldung/disruptor/MultiEventConsumer.java Normal file
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@ -0,0 +1,27 @@
package com.baeldung.disruptor;
import static org.junit.Assert.assertEquals;
import com.lmax.disruptor.EventHandler;
public class MultiEventConsumer implements EventConsumer {
private int expectedValue = -1;
private int otherExpectedValue = -1;
@Override
@SuppressWarnings("unchecked")
public EventHandler<ValueEvent>[] getEventHandler() {
final EventHandler<ValueEvent> eventHandler = (event, sequence, endOfBatch) -> assertExpectedValue(event.getValue());
final EventHandler<ValueEvent> otherEventHandler = (event, sequence, endOfBatch) -> assertOtherExpectedValue(event.getValue());
return new EventHandler[] { eventHandler, otherEventHandler };
}
private void assertExpectedValue(final int id) {
assertEquals(++expectedValue, id);
}
private void assertOtherExpectedValue(final int id) {
assertEquals(++otherExpectedValue, id);
}
}

21
core-java/src/test/java/com/baeldung/disruptor/SingleEventConsumer.java Normal file
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@ -0,0 +1,21 @@
package com.baeldung.disruptor;
import static org.junit.Assert.assertEquals;
import com.lmax.disruptor.EventHandler;
public class SingleEventConsumer implements EventConsumer {
private int expectedValue = -1;
@Override
@SuppressWarnings("unchecked")
public EventHandler<ValueEvent>[] getEventHandler() {
final EventHandler<ValueEvent> eventHandler = (event, sequence, endOfBatch) -> assertExpectedValue(event.getValue());
return new EventHandler[] { eventHandler };
}
private void assertExpectedValue(final int id) {
assertEquals(++expectedValue, id);
}
}