concurrent programming using the disruptor - copenhagen
DESCRIPTION
The version of my Disruptor talk given at GOTO CopenhagenTRANSCRIPT
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Concurrent Programming Using The Disruptor
Trisha GeeLMAX
Wednesday, 23 May 12
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Concurrent Programming Using The Disruptor
Trisha Gee, Developer at LMAX@trisha_gee
mechanitis.blogspot.com
Wednesday, 23 May 12
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The Disruptor?
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What I’m covering
• Overview of the Disruptor
• Create your own!
• Turn it up to Eleven
• Q&A
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What is it?
• Data structure and work flow with no contention.
• Very fast message passing.
• Allows you to go truly parallel.
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So...?
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The Magic RingBuffer
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The Magic RingBuffer
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The Magic RingBuffer
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The Magic RingBuffer
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The Magic RingBuffer
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The Magic RingBuffer
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The Magic RingBuffer
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Creating a RingBuffer
final RingBuffer<SimpleEvent> ringBuffer = new RingBuffer<SimpleEvent>(SimpleEvent.EVENT_FACTORY, RING_BUFFER_SIZE);
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The Events are Buckets
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Great! I want one!
public class SimpleEvent { public static final EventFactory<SimpleEvent> EVENT_FACTORY = new SimpleEventFactory();
private volatile String value;
private static class SimpleEventFactory implements EventFactory<SimpleEvent> { @Override public SimpleEvent newInstance() { return new SimpleEvent(); } } }
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I’ve got a RingBuffer!
• Erm.... how do I poke things into it?
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The Publisher
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What do I do?
SimpleEventTranslator translator = new SimpleEventTranslator();
EventPublisher<SimpleEvent> publisher = new EventPublisher<SimpleEvent>(ringBuffer);
// poke your translator here// ...and when you’re done...publisher.publishEvent(translator);
public class SimpleEventTranslator implements EventTranslator<SimpleEvent>
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...so now I want to read
• The Disruptor provides nice batching behaviour for free
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...and all you need is...
public class SimpleEventHandler implements EventHandler<SimpleEvent> { @Override public void onEvent(final SimpleEvent event, final long sequence, final boolean endOfBatch) throws Exception { // do stuff } }
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Shiny. So what?
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Let’s go parallel
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And now for something different...
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Remember Henry Ford?
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Complex workflow...
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What on Earth has this got to do with RingBuffers?!
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Don’t wrap the buffer!
ringBuffer.setGatingSequences(finalEventProcessor.getSequence());
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Caveats
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Is that it?
• Wait and claim strategies
• Batch publishing
• Multiple publishers
• Different EventHandlers
• The Wizard
• You don’t even need a RingBuffer...
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You get...
• A framework the encourages you to model your domain
• The ability to run in parallel but single-threaded
• Reliable ordering
• ...and it can be very fast
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More Information
• Google Code Site, including Wikihttp://code.google.com/p/disruptor/
• Blogs, e.g. mine: mechanitis.blogspot.com
• Presentations
• Google Group
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Q&A
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WorkerPool
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AggregateEventHandler
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WaitStrategies
• BlockingWaitStrategy
• BusySpinWaitStrategy
• SleepingWaitStrategy
• YieldingWaitStrategy
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ClaimStrategies
• SingleThreadedClaimStrategy
• MultiThreadedClaimStrategy
• MultiThreadedLowContentionClaimStrategy
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