NealDebuging/disruptor-demo

getting familiar with disruptor and apply the event graph

1. quick start reference https://www.baeldung.com/java-ring-buffer https://www.baeldung.com/lmax-disruptor-concurrency https://lmax-exchange.github.io/disruptor/user-guide/index.html#_using_the_disruptor

2. read and comprehension what is false sharing? why AtomicLong has this false sharing issue, how to fix it? https://www.baeldung.com/java-false-sharing-contended use padding to avoid false sharing caused by CPU spatial locality

3. run demo

4. try dependency graph

• The ApplicationConsumer depends on the JournalConsumer and ReplicationConsumer.
• stuck at how to use ringBuffer.addGatingSequences();??? go to the github and search in the official repository so Basically wen don't need to use addGatingSequences, since disruptor provide the DSL handleEventWith/then which is basically the same as new BatchEventProcessor(ringBuffer, barrier, eventHandler) processorSequences[i] = batchEventProcessor.getSequence(); return new EventHandlerGroup(this, consumerRepository, processorSequences); then addGatingSequences

5. build event tree [todo]

6. check how does soul use disruptor https://github.com/dromara/soul https://github.com/dromara/soul/tree/master/soul-disruptor well looks like dromara only documented disruptor for hmily on weichat

7. try to analyze disruptor usage in hmily after compare hmily and soul, looks like soul is a refactor versin of hmily's disruptor, much more clear structure and easy to understand, we can use this as cutpoint to learn about those 2 modules.

8. learn hmily and soul's disruptor