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| LMAX Disruptor | ||
| ============== | ||
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| A High Performance Inter-Thread Messaging Library | ||
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| Maintainer | ||
| ========== | ||
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| Michael Barker <[email protected]> | ||
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| Changelog | ||
| ========== | ||
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| ### 2.10.3 Released (22-Aug-2012) | ||
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| - Bug fix, race condition in SequenceGroup when removing Sequences and getting current value | ||
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| ### 2.10.2 Released (21-Aug-2012) | ||
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| - Bug fix, potential race condition in BlockingWaitStrategy. | ||
| - Bug fix set initial SequenceGroup value to -1 (Issue #27). | ||
| - Deprecate timeout methods that will be removed in version 3. | ||
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| ### 2.10.1 (6-June-2012) | ||
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| - Bug fix, correct OSGI metadata. | ||
| - Remove unnecessary code in wait strategies. | ||
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| ## 2.10 (13-May-2012) | ||
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| - Remove deprecated timeout methods. | ||
| - Added OSGI metadata to jar file. | ||
| - Removed PaddedAtomicLong and use Sequence in all places. | ||
| - Fix various generics warnings. | ||
| - Change Sequence implementation to work around IBM JDK bug and improve performance by ~10%. | ||
| - Add a remainingCapacity() call to the Sequencer class. | ||
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| ## 2.9 (8-Apr-2012) | ||
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| - Deprecate timeout methods for publishing. | ||
| - Add tryNext and tryPublishEvent for events that shouldn't block during delivery. | ||
| - Small performance enhancement for MultithreadClaimStrategy. | ||
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| ## 2.8 (6-Feb-2012) | ||
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| - Create new MultithreadClaimStrategy that works between when threads are highly contended. Previous implementation is now called MultithreadLowContentionClaimStrategy | ||
| - Fix for bug where EventProcessors weren't being added as gating sequences to the ring buffer. | ||
| - Fix range tracking bug in Histogram | ||
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| ### 2.7.1 (21-Dec-2011) | ||
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| - Artefacts made available via maven central repository. (groupId:com.googlecode.disruptor, artifactId:disruptor) See UsingDisruptorInYourProject for details. | ||
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| ## 2.7 (12-Nov-2011) | ||
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| - Changed construction API to allow user supplied claim and wait strategies | ||
| - Added AggregateEventHandler to support multiple EventHandlers from a single BatchEventProcessor | ||
| - Support exception handling from LifecycleAware | ||
| - Added timeout API calls for claiming a sequence when publishing | ||
| - Use LockSupport.parkNanos() instead of Thread.sleep() to reduce latency | ||
| - Reworked performance tests to better support profiling and use LinkedBlockingQueue for comparison because it performs better on the latest processors | ||
| - Minor bugfixes | ||
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| ## 2.6 | ||
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| - Introduced WorkerPool to allow the one time consumption of events by a worker in a pool of EventProcessors. | ||
| - New internal implementation of SequenceGroup which is lock free at all times and garbage free for get and set operations. | ||
| - SequenceBarrier now checks alert status on every call whether it is blocking or not. | ||
| - Added scripts in preparation for publishing binaries to maven repository. | ||
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| ### 2.5.1 | ||
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| - Bugfix for supporting SequenceReportingEventHandler from DSL. ([issue 9](https://github.com/LMAX-Exchange/disruptor/issues#issue/9)) | ||
| - Bugfix for multi-threaded publishing to multiple ring buffers ([issue 10](https://github.com/LMAX-Exchange/disruptor/issues#issue/10)) | ||
| - Change SequenceBarrier to always check alert status before entering waitFor cycle. Previously this was only checked when the requested sequence was not available. | ||
| - Change ClaimStrategy to not spin when the buffer has no available capacity, instead go straight to yielding to allow event processors to catch up. | ||
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| ## 2.5 | ||
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| - Changed RingBuffer and publisher API so any mutable object can be placed in the RingBuffer without having to extend AbstractEvent | ||
| - Added EventPublisher implementation to allow the publishing steps to be combined into one action | ||
| - DisruptorWizard has been renamed to Disruptor with added support for any subtype of EventProcessor | ||
| - Introduced a new Sequencer class that allows the Disruptor to be applied to other data structures such as multiple arrays. This can be a very useful pattern when multiple event processors work on the same event and you want to avoid false sharing. The Diamond for FizzBuzz is a good example of the issue. It is also higher performance by avoiding the pointer indirection when arrays of primitives are used. | ||
| - Further increased performance and scalability by reducing false sharing. | ||
| - Added progressive backoff strategy to the MultiThreadedClaimStrategy to prevent publisher getting into the claim cycle when the buffer is full because of a slow EventProcessor. | ||
| - Significantly improved performance to WaitStrategy.Option.BLOCKING | ||
| - Introduced SequenceGroup to allow dynamic registration of EventProcessors. | ||
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| ### 2.0.2 | ||
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| - Rework of "False Sharing" prevention which makes the performance much more predictable across all platforms. Special thanks to Jeff Hain for helping focus in on a solution. | ||
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| ### 2.0.1 | ||
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| - Renaming mistake for publishEventAtSequence should have been claimEventAtSequence | ||
| - Fixed bug in YieldingStrategy that was busy spinning more than yielding and introduced SleepingStrategy | ||
| - Removed code duplication in Unicast perf tests for expected result | ||
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| ## 2.0.0 | ||
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| - New API to reflect naming changes | ||
| - Producer -> Publisher | ||
| - Entry -> Event | ||
| - Consumer -> EventProcessor | ||
| - ConsumerBarrier -> DependencyBarrier | ||
| - ProducerBarrier has been incorporated into the RingBuffer for ease of use | ||
| - DisruptorWizard integrated for fluent API dependency graph construction | ||
| - Rework of sequence tracking to avoid false sharing on Java 7, plus avoid mega-morphic calls to make better use of the instruction cache | ||
| - Reduced usage of memory barriers where possible | ||
| - WaitStrategy.YIELDING initially spins for a short period to reduce latency | ||
| - Major performance improvement giving more than a 2X increase for throughput across most use cases. | ||
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| ### 1.2.2 | ||
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| - ProducerBarrier change to yield after busy spinning for a while. This may help the situation when the the number of producers exceeds the number of cores. | ||
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| ### 1.2.1 | ||
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| - Bug fix for setting the sequence in the ForceFillProducerBarrier. | ||
| - Code syntax tidy up. | ||
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| ## 1.2.0 | ||
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| - Bug fix for regression introduced inlining multi-thread producer commit tracking code. This was a critical bug for the multi-threaded producer scenario. | ||
| - Added new ProducerBarrier method for claiming a batch of sequences. This feature can give a significant throughput increase. | ||
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| ## 1.1.0 | ||
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| - Off by one regression bug in ProducerBarrier introduced in 1.0.9. | ||
| - Clarified the algorithm for initial cursor value in the ClaimStrategy. | ||
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| ### 1.0.9 | ||
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| - Added Apache 2.0 licence and comments. | ||
| - Small performance improvements to producers barriers and BatchConsumer. | ||
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| ### 1.0.8 | ||
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| - Bugfix for BatchConsumer sequence update when using SequenceTrackingHandler to ensure sequence is always updated at the end of a batch regardless. | ||
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| ### 1.0.7 | ||
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| - Factored out LifecycleAware interface to allowing consumers handlers to be notified when their thread starts and shuts down. | ||
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| ### 1.0.6 | ||
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| - Cache minimum consumer sequence in producer barriers. This helps make the performance more predictable on Nehalem processors and greater on earlier Core 2 processors. | ||
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| ### 1.0.5 | ||
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| - Removed Entry interface. All Entries must now extend AbstractEntry. | ||
| - Made setSequence package private on AbstractEntry for encapsulation. |