{"id":400,"date":"2013-08-12T21:55:46","date_gmt":"2013-08-12T13:55:46","guid":{"rendered":"http:\/\/coderbee.net\/?p=400"},"modified":"2019-01-06T21:26:25","modified_gmt":"2019-01-06T13:26:25","slug":"disruptor-%e6%ba%90%e7%a0%81%e8%a7%a3%e8%af%bb","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/open-source\/20130812\/400","title":{"rendered":"Disruptor \u6e90\u7801\u9605\u8bfb\u7b14\u8bb0"},"content":{"rendered":"<h2>\u4e00\u3001Disruptor \u662f\u4ec0\u4e48\uff1f<\/h2>\n<p>Disruptor \u662f\u4e00\u4e2a\u9ad8\u6027\u80fd\u5f02\u6b65\u5904\u7406\u6846\u67b6\uff0c\u4e5f\u53ef\u4ee5\u8ba4\u4e3a\u662f\u4e00\u4e2a\u6d88\u606f\u6846\u67b6\uff0c\u5b83\u5b9e\u73b0\u4e86\u89c2\u5bdf\u8005\u6a21\u5f0f\u3002<\/p>\n<p>Disruptor \u6bd4\u4f20\u7edf\u7684\u57fa\u4e8e\u9501\u7684\u6d88\u606f\u6846\u67b6\u7684\u4f18\u52bf\u5728\u4e8e\uff1a\u5b83\u662f\u65e0\u9501\u7684\u3001CPU\u53cb\u597d\uff1b\u5b83\u4e0d\u4f1a\u6e05\u9664\u7f13\u5b58\u4e2d\u7684\u6570\u636e\uff0c\u53ea\u4f1a\u8986\u76d6\uff0c\u964d\u4f4e\u4e86\u5783\u573e\u56de\u6536\u673a\u5236\u542f\u52a8\u7684\u9891\u7387\u3002<\/p>\n<p>\u8fd9\u4e2a\u89e3\u8bfb\u662f\u5728\u6700\u65b0\u7248  3.1.1 \u7684\u6e90\u7801\u4e0a\u8fdb\u884c\u3002<\/p>\n<p>\u5173\u4e8eDisruptor\u7684\u66f4\u591a\u4ecb\u7ecd\u53ef\u89c1\uff1a <a href=\"http:\/\/ifeve.com\/disruptor\/\">http:\/\/ifeve.com\/disruptor\/<\/a><\/p>\n<h2>\u4e8c\u3001Disruptor \u4e3a\u4ec0\u4e48\u5feb<\/h2>\n<ul>\n<li>\u4e0d\u4f7f\u7528\u9501\u3002\u901a\u8fc7\u5185\u5b58\u5c4f\u969c\u548c\u539f\u5b50\u6027\u7684CAS\u64cd\u4f5c\u66ff\u6362\u9501\u3002<\/p>\n<\/li>\n<li>\n<p>\u7f13\u5b58\u57fa\u4e8e\u6570\u7ec4\u800c\u4e0d\u662f\u94fe\u8868\uff0c\u7528\u4f4d\u8fd0\u7b97\u66ff\u4ee3\u6c42\u6a21\u3002\u7f13\u5b58\u7684\u957f\u5ea6\u603b\u662f2\u7684n\u6b21\u65b9\uff0c\u8fd9\u6837\u53ef\u4ee5\u7528\u4f4d\u8fd0\u7b97 <code>i &amp; (length - 1)<\/code> \u66ff\u4ee3 <code>i % length<\/code>\u3002<\/p>\n<\/li>\n<li>\n<p>\u53bb\u9664\u4f2a\u5171\u4eab\u3002CPU\u7684\u7f13\u5b58\u4e00\u822c\u662f\u4ee5\u7f13\u5b58\u884c\u4e3a\u6700\u5c0f\u5355\u4f4d\u7684\uff0c\u5bf9\u5e94\u4e3b\u5b58\u7684\u4e00\u5757\u76f8\u5e94\u5927\u5c0f\u7684\u5355\u5143\uff1b\u5f53\u524d\u7684\u7f13\u5b58\u884c\u5927\u5c0f\u4e00\u822c\u662f64\u5b57\u8282\uff0c\u6bcf\u4e2a\u7f13\u5b58\u884c\u4e00\u6b21\u53ea\u80fd\u88ab\u4e00\u4e2aCPU\u6838\u8bbf\u95ee\uff0c\u5982\u679c\u4e00\u4e2a\u7f13\u5b58\u884c\u88ab\u591a\u4e2aCPU\u6838\u8bbf\u95ee\uff0c\u5c31\u4f1a\u9020\u6210\u7ade\u4e89\uff0c\u5bfc\u81f4\u67d0\u4e2a\u6838\u5fc5\u987b\u7b49\u5176\u4ed6\u6838\u5904\u7406\u5b8c\u4e86\u624d\u80fd\u7ee7\u7eed\u5904\u7406\uff0c\u54cd\u5e94\u6027\u80fd\u3002\u53bb\u9664\u4f2a\u5171\u4eab\u5c31\u662f\u786e\u4fddCPU\u6838\u8bbf\u95ee\u67d0\u4e2a\u7f13\u5b58\u884c\u65f6\u4e0d\u4f1a\u51fa\u73b0\u4e89\u7528\u3002<\/p>\n<\/li>\n<li>\n<p>\u9884\u5206\u914d\u7f13\u5b58\u5bf9\u8c61\uff0c\u901a\u8fc7\u66f4\u65b0\u7f13\u5b58\u91cc\u5bf9\u8c61\u7684\u5c5e\u6027\u800c\u4e0d\u662f\u5220\u9664\u5bf9\u8c61\u6765\u51cf\u5c11\u5783\u573e\u56de\u6536\u3002<\/p>\n<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<h2>\u4e09\u3001Disruptor \u67b6\u6784<\/h2>\n<h3>\u6838\u5fc3\u7c7b\u548c\u63a5\u53e3<\/h3>\n<ul>\n<li><code>EventHandler<\/code>\uff1a\u7528\u6237\u63d0\u4f9b\u5177\u4f53\u7684\u5b9e\u73b0\uff0c\u5728\u91cc\u9762\u5b9e\u73b0\u4e8b\u4ef6\u7684\u5904\u7406\u903b\u8f91\u3002<\/li>\n<li><code>Sequence<\/code>\uff1a\u4ee3\u8868\u4e8b\u4ef6\u5e8f\u53f7\u6216\u4e00\u4e2a\u6307\u5411\u7f13\u5b58\u67d0\u4e2a\u4f4d\u7f6e\u7684\u5e8f\u53f7\u3002<\/li>\n<li><code>WaitStrategy<\/code>\uff1a\u529f\u80fd\u5305\u62ec\uff1a\u5f53\u6ca1\u6709\u53ef\u6d88\u8d39\u7684\u4e8b\u4ef6\u65f6\uff0c\u6839\u636e\u7279\u5b9a\u7684\u5b9e\u73b0\u8fdb\u884c\u7b49\u5f85\uff0c\u6709\u53ef\u6d88\u8d39\u4e8b\u4ef6\u65f6\u8fd4\u56de\u53ef\u4e8b\u4ef6\u5e8f\u53f7\uff1b\u6709\u65b0\u4e8b\u4ef6\u53d1\u5e03\u65f6\u901a\u77e5\u7b49\u5f85\u7684 <code>SequenceBarrier<\/code>\u3002<\/li>\n<li><code>Sequencer<\/code>\uff1a\u751f\u4ea7\u8005\u7528\u4e8e\u8bbf\u95ee\u7f13\u5b58\u7684\u63a7\u5236\u5668\uff0c\u5b83\u6301\u6709\u6d88\u8d39\u8005\u5e8f\u53f7\u7684\u5f15\u7528\uff1b\u65b0\u4e8b\u4ef6\u53d1\u5e03\u540e\u901a\u8fc7 <code>WaitStrategy<\/code> \u901a\u77e5\u6b63\u5728\u7b49\u5f85\u7684<code>SequenceBarrier<\/code>\u3002<\/li>\n<li><code>SequenceBarrier<\/code>\uff1a\u6d88\u8d39\u8005\u5173\u5361\u3002\u6d88\u8d39\u8005\u7528\u4e8e\u8bbf\u95ee\u7f13\u5b58\u7684\u63a7\u5236\u5668\uff0c\u6bcf\u4e2a\u8bbf\u95ee\u63a7\u5236\u5668\u8fd8\u6301\u6709\u524d\u7f6e\u8bbf\u95ee\u63a7\u5236\u5668\u7684\u5f15\u7528\uff0c\u7528\u4e8e\u7ef4\u6301\u6b63\u786e\u7684\u4e8b\u4ef6\u5904\u7406\u987a\u5e8f\uff1b\u901a\u8fc7<code>WaitStrategy<\/code>\u83b7\u53d6\u53ef\u6d88\u8d39\u4e8b\u4ef6\u5e8f\u53f7\u3002<\/li>\n<li><code>EventProcessor<\/code>\uff1a\u4e8b\u4ef6\u5904\u7406\u5668\uff0c\u662f\u53ef\u6267\u884c\u5355\u5143\uff0c\u8fd0\u884c\u5728\u6307\u5b9a\u7684Executor\u91cc\uff1b\u5b83\u4f1a\u4e0d\u65ad\u5730\u901a\u8fc7<code>SequenceBarrier<\/code>\u83b7\u53d6\u53ef\u6d88\u8d39\u4e8b\u4ef6\uff0c\u5f53\u6709\u53ef\u6d88\u8d39\u4e8b\u4ef6\u65f6\u8c03\u7528\u7528\u6237\u63d0\u4f9b\u7684 <code>EventHandler<\/code>\u5b9e\u73b0\u5904\u7406\u4e8b\u4ef6\u3002<\/li>\n<li><code>EventTranslator<\/code>\uff1a\u4e8b\u4ef6\u8f6c\u6362\u5668\uff0c\u7531\u4e8eDisruptor\u53ea\u4f1a\u8986\u76d6\u7f13\u5b58\uff0c\u9700\u8981\u901a\u8fc7\u6b64\u63a5\u53e3\u7684\u5b9e\u73b0\u6765\u66f4\u65b0\u7f13\u5b58\u91cc\u7684\u4e8b\u4ef6\u6765\u8986\u76d6\u65e7\u4e8b\u4ef6\u3002<\/li>\n<li><code>RingBuffer<\/code>\uff1a\u57fa\u4e8e\u6570\u7ec4\u7684\u7f13\u5b58\u5b9e\u73b0\uff0c\u5b83\u5185\u90e8\u6301\u6709\u5bf9<code>Executor<\/code>\u3001<code>WaitStrategy<\/code>\u3001\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005\u8bbf\u95ee\u63a7\u5236\u5668\u7684\u5f15\u7528\u3002<\/li>\n<li><code>Disruptor<\/code>\uff1a\u63d0\u4f9b\u4e86\u5bf9 <code>RingBuffer<\/code> \u7684\u5c01\u88c5\uff0c\u5e76\u63d0\u4f9b\u4e86\u4e00\u4e9bDSL\u98ce\u683c\u7684\u65b9\u6cd5\uff0c\u65b9\u4fbf\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<p>\u6bcf\u4e2a\u4e8b\u4ef6\u5904\u7406\u5668<code>EventProcessor<\/code>\u90fd\u6301\u6709\u4e00\u4e2a\u8868\u793a\u5b83\u6700\u540e\u5904\u7406\u7684\u4e8b\u4ef6\u7684\u5e8f\u53f7\u7684<code>Sequence<\/code>\uff0c\u6240\u4ee5\u53ef\u4ee5\u7528<code>Sequence<\/code>\u6765\u4ee3\u8868\u4e8b\u4ef6\u5904\u7406\u5668\uff1b<\/p>\n<p>\u4e0b\u9762\u662fDisruptor\u91cc\u4e8b\u4ef6\u5904\u7406\u7684\u4e00\u4e2a\u793a\u4f8b\u56fe\uff1a<br \/>\n<a href=\"\/\/coderbee.net\/wp-content\/uploads\/2013\/08\/Disruptor2.png\"><img loading=\"lazy\" decoding=\"async\" src=\"\/\/coderbee.net\/wp-content\/uploads\/2013\/08\/Disruptor2-300x111.png\" alt=\"Disruptor2\" width=\"300\" height=\"111\" class=\"alignnone size-medium wp-image-432\" srcset=\"https:\/\/coderbee.net\/wp-content\/uploads\/2013\/08\/Disruptor2-300x111.png 300w, https:\/\/coderbee.net\/wp-content\/uploads\/2013\/08\/Disruptor2-624x232.png 624w, https:\/\/coderbee.net\/wp-content\/uploads\/2013\/08\/Disruptor2.png 660w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<h2>\u56db\u3001\u5b9e\u73b0<\/h2>\n<h3>Sequence \u7c7b<\/h3>\n<p>Sequence\u7c7b\u8868\u793a\u4e00\u4e2a\u5e8f\u53f7\uff0c\u662f\u5bf9long\u578b\u5b57\u6bb5\u7684\u7ebf\u7a0b\u5b89\u5168\u7684\u5c01\u88c5\uff0c\u7528\u4e8e\u8ddf\u8e2aringBuffer\u7684\u8fdb\u5ea6\u548c\u4e8b\u4ef6\u5904\u7406\u5668\u7684\u8fdb\u5ea6\u3002<\/p>\n<p>\u652f\u6301\u4e00\u4e9b\u5e76\u53d1\u64cd\u4f5c\uff0c\u5305\u62ecCAS\u548c\u6709\u5e8f\u5199\u3002<\/p>\n<p>\u5c1d\u8bd5\u5728volatile\u5b57\u6bb5\u5468\u56f4\u586b\u5145\u5185\u5bb9\u6765\u907f\u514d\u4f2a\u5171\u4eab\uff0c\u53d8\u5f97\u66f4\u9ad8\u6548\u3002<\/p>\n<h4>\u5b9e\u73b0<\/h4>\n<pre>\r\npublic class Sequence {\r\n    static final long INITIAL_VALUE = -1L;\r\n    private static final Unsafe UNSAFE;\r\n    private static final long VALUE_OFFSET;\r\n\r\n    static {\r\n        UNSAFE = Util.getUnsafe();\r\n        final int base = UNSAFE.arrayBaseOffset( long[].class );\r\n        final int scale = UNSAFE.arrayIndexScale( long[].class );\r\n        VALUE_OFFSET = base + (scale * 7);\r\n    }\r\n\r\n    \/\/ 15\u4e2a\u5143\u7d20\uff0c\u4ece0\u5f00\u59cb\uff0c\u6709\u6548\u503c\u5904\u4e8e\u7b2c7\u4e2a\uff0c\u8fd9\u6837\u524d\u540e\u5404\u67097\u4e2along\u5b57\u6bb5\u586b\u5145\uff0c\r\n    \/\/ 8\u4e2along\u578b\u5360\u5171\u752864\u5b57\u8282\uff0c\u800c\u5f53\u524dCPU\u7684\u7f13\u5b58\u884c\u5927\u5c0f\u4e5f\u662f64\u5b57\u8282\uff0c\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u5bf9Sequence\u7684\u8bfb\u5199\u51fa\u73b0\u4f2a\u5171\u4eab\u3002\r\n    private final long [] paddedValue = new long [15];\r\n\r\n    \/\/ \u539f\u5b50\u5730\u8bfb\r\n    public long get() {\r\n        return UNSAFE .getLongVolatile(paddedValue, VALUE_OFFSET);\r\n    }\r\n\r\n    \/\/ \u539f\u5b50\u5730\u5199\r\n    public void set(final long value) {\r\n        UNSAFE.putOrderedLong(paddedValue , VALUE_OFFSET, value);\r\n    }\r\n\r\n    \/\/ CAS\r\n    public boolean compareAndSet(final long expectedValue, final long newValue) {\r\n        return UNSAFE .compareAndSwapLong(paddedValue, VALUE_OFFSET, expectedValue, newValue);\r\n    }\r\n\r\n    public long addAndGet(final long increment) {\r\n        long currentValue;\r\n        long newValue;\r\n\r\n        do {\r\n            currentValue = get();\r\n            newValue = currentValue + increment;\r\n        } while (!compareAndSet(currentValue, newValue));\r\n\r\n        return newValue;\r\n    }\r\n\r\n        \/\/ \u8fd8\u6709\u5176\u4ed6\u4e00\u4e9b\u65b9\u6cd5\uff0c\u90fd\u662f\u501f\u52a9 sun.misc.Unsafe \u7c7b\u6765\u5b9e\u73b0\u7684\u3002\r\n<\/pre>\n<h4>\u4f2a\u5171\u4eab<\/h4>\n<p>\u5173\u4e8e\u4f2a\u5171\u4eab\u53ef\u53c2\u8003\uff1a<\/p>\n<ul>\n<li>\u300a\u5256\u6790Disruptor:\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u4e48\u5feb\uff1f\uff08\u4e8c\uff09\u795e\u5947\u7684\u7f13\u5b58\u884c\u586b\u5145\u300b <a href=\"http:\/\/ifeve.com\/disruptor-cacheline-padding\/\">http:\/\/ifeve.com\/disruptor-cacheline-padding\/<\/a><\/p>\n<\/li>\n<li>\n<p>\u300a\u4f2a\u5171\u4eab(False Sharing)\u300b- <a href=\"http:\/\/ifeve.com\/falsesharing\/\">http:\/\/ifeve.com\/falsesharing\/<\/a><\/p>\n<\/li>\n<\/ul>\n<h3>Disruptor\u7c7b<\/h3>\n<p>Disruptor\u7c7b\u662f\u8fd9\u4e2a\u7c7b\u5e93\u7684\u95e8\u9762\uff0c\u7528DSL\u7684\u5f62\u5f0f\u76f4\u89c2\u5730\u63d0\u4f9b\u4e86\u7ec4\u88c5\u4e8b\u4ef6\u56de\u8c03\u5904\u7406\u7684\u5173\u7cfb\u94fe\u7684\u529f\u80fd\uff0c\u5e76\u63d0\u4f9b\u83b7\u53d6\u4e8b\u4ef6\u3001\u53d1\u5e03\u4e8b\u4ef6\u7684\u65b9\u6cd5\uff0c\u7f13\u5b58\u5bb9\u5668\u751f\u547d\u5468\u671f\u7ba1\u7406\u3002<\/p>\n<h4>\u5c5e\u6027<\/h4>\n<pre>\r\nprivate final RingBuffer<T> ringBuffer ; \/\/ \u6838\u5fc3\uff0c\u7edd\u5927\u591a\u6570\u529f\u80fd\u90fd\u59d4\u6258\u7ed9ringBuffer\u5904\u7406\r\nprivate final Executor executor ;        \/\/ \u7528\u4e8e\u6267\u884c\u4e8b\u4ef6\u5904\u7406\u5668\u7684\u7ebf\u7a0b\u6c60\r\nprivate final ConsumerRepository<T> consumerRepository = new ConsumerRepository<T>();   \/\/ \u4e8b\u4ef6\u5904\u7406\u5668\u4ed3\u5e93\uff0c\u5c31\u662f\u4e8b\u4ef6\u5904\u7406\u5668\u7684\u96c6\u5408\r\nprivate final AtomicBoolean started = new AtomicBoolean( false);     \/\/ \u542f\u52a8\u65f6\u68c0\u67e5\uff0c\u53ea\u80fd\u542f\u52a8\u4e00\u6b21\r\nprivate ExceptionHandler exceptionHandler;  \/\/ \u5f02\u5e38\u5904\u7406\u5668\r\n<\/pre>\n<h4>\u8bbe\u7f6eEventHandler\u4e8b\u4ef6\u5904\u7406\u5668<\/h4>\n<pre>\r\n\/*\r\n * barrierSequences\u662feventHandlers\u7684\u524d\u7f6e\u4e8b\u4ef6\u5904\u7406\u5173\u5361\uff0c\u662f\u7528\u6765\u4fdd\u8bc1\u4e8b\u4ef6\u5904\u7406\u7684\u65f6\u5e8f\u6027\u7684\u5173\u952e\uff1b\r\n * *\/\r\nEventHandlerGroup<T> createEventProcessors( final Sequence[] barrierSequences,\r\n                                           final EventHandler<T>[] eventHandlers) {\r\n    checkNotStarted();  \/\/ \u786e\u4fdd\u5728\u5bb9\u5668\u542f\u52a8\u524d\u8bbe\u7f6e\r\n\r\n    final Sequence[] processorSequences = new Sequence[eventHandlers.length ];   \/\/ \u5b58\u653e\u6e38\u6807\u7684\u6570\u7ec4\r\n    final SequenceBarrier barrier = ringBuffer.newBarrier(barrierSequences);    \/\/ \u83b7\u53d6\u524d\u7f6e\u7684\u5e8f\u53f7\u5173\u5361\r\n\r\n    for ( int i = 0, eventHandlersLength = eventHandlers.length; i < eventHandlersLength; i++) {\r\n        final EventHandler<T> eventHandler = eventHandlers[i];\r\n\r\n        \/\/ \u5c01\u88c5\u4e3a\u6279\u91cf\u4e8b\u4ef6\u5904\u7406\u5668BatchEventProcessor\uff0c\u5176\u5b9e\u73b0\u4e86Runnable\u63a5\u53e3\uff0c\u6240\u4ee5\u53ef\u4ee5\u653e\u5230executor\u53bb\u6267\u884c\u5904\u7406\u903b\u8f91\uff1b\u5904\u7406\u5668\u8fd8\u4f1a\u81ea\u52a8\u5efa\u7acb\u4e00\u4e2a\u5e8f\u53f7Sequence\u3002\r\n        final BatchEventProcessor<T> batchEventProcessor = new BatchEventProcessor<T>(ringBuffer , barrier, eventHandler);\r\n\r\n        if (exceptionHandler != null) { \/\/ \u5982\u679c\u6709\u5219\u8bbe\u7f6e\u5f02\u5e38\u5904\u7406\u5668\r\n            batchEventProcessor.setExceptionHandler( exceptionHandler);\r\n        }\r\n\r\n        \/\/ \u6dfb\u52a0\u5230\u6d88\u8d39\u8005\u4ed3\u5e93\uff0c\u4f1a\u5148\u5c01\u88c5\u4e3aEventProcessorInfo\u5bf9\u8c61\uff08\u8868\u793a\u4e8b\u4ef6\u5904\u7406\u7684\u4e00\u4e2a\u9636\u6bb5\uff09\uff0c\r\n        consumerRepository.add(batchEventProcessor, eventHandler, barrier);\r\n        processorSequences[i] = batchEventProcessor.getSequence();\r\n    }\r\n\r\n    if (processorSequences. length > 0) {\/\/ \u5982\u679c\u6709\u524d\u7f6e\u5173\u5361\uff0c\u5219\u53d6\u6d88\u4e4b\u524d\u7684\u524d\u7f6e\u5173\u5361\u5bf9\u5e94\u7684EventProcessor \u7684 \u94fe\u7684\u7ec8\u70b9\u6807\u8bb0\u3002\r\n        consumerRepository.unMarkEventProcessorsAsEndOfChain(barrierSequences);\r\n    }\r\n\r\n    \/\/ EventHandlerGroup\u662f\u4e00\u7ec4EventProcessor\uff0c\u4f5c\u4e3adisruptor\u7684\u4e00\u90e8\u5206\uff0c\u63d0\u4f9bDSL\u5f62\u5f0f\u7684\u65b9\u6cd5\uff0c\u4f5c\u4e3a\u65b9\u6cd5\u94fe\u7684\u8d77\u70b9\uff0c\u7528\u4e8e\u8bbe\u7f6e\u4e8b\u4ef6\u5904\u7406\u5668\u3002\r\n    return new EventHandlerGroup<T>(this, consumerRepository, processorSequences);\r\n}\r\n<\/pre>\n<p><strong>\u8fd9\u91cc\u8981\u6ce8\u610f\u7684\u662f\uff0cEventHandler\u53ea\u80fd\u5728\u542f\u52a8\u524d\u6dfb\u52a0\u3002<\/strong><\/p>\n<p>\u4ece\u4ee3\u7801\u6765\u770b\uff0cEventHandler\u662f\u7528\u6237\u63d0\u4f9b\u7684\uff0c\u5355\u7eaf\u7684\u7684\u4e8b\u4ef6\u5904\u7406\u903b\u8f91\u7684\u5b9e\u73b0\uff0c\u5728\u88ab\u6dfb\u52a0\u5230\u6d88\u8d39\u8005\u4ed3\u5e93\u4e4b\u524d\uff0c\u5b83\u4f1a\u88ab\u5c01\u88c5\u4e3a\u4e00\u4e2aEventProcessor\u5bf9\u8c61\u3002<\/p>\n<h3>RingBuffer \u7c7b<\/h3>\n<h4>\u5c5e\u6027<\/h4>\n<p>\u9996\u5148\u6765\u770b\u4e0bRingBuffer\u7c7b\u7684\u5c5e\u6027\uff1a<\/p>\n<pre>\r\n\/\/  \u5c5e\u6027\u7684\u521d\u59cb\u5316\u58f0\u660e\r\n    public static final long INITIAL_CURSOR_VALUE = Sequence.INITIAL_VALUE ;\r\n    private final int indexMask ;\r\n    private final Object[] entries ;\r\n    private final int bufferSize ;\r\n    private final Sequencer sequencer ;\r\n\r\n\r\n\/\/  \u5c5e\u6027\u7684\u521d\u59cb\u5316\u4ee3\u7801\r\n    RingBuffer(EventFactory<E> eventFactory,\r\n               Sequencer       sequencer) {\r\n        this.sequencer     = sequencer;\r\n        this.bufferSize    = sequencer.getBufferSize();\r\n\r\n        if (bufferSize < 1) {\r\n            throw new IllegalArgumentException(\"bufferSize must not be less than 1\");\r\n        }\r\n        if (Integer.bitCount( bufferSize) != 1) {\r\n            throw new IllegalArgumentException(\"bufferSize must be a power of 2\");\r\n        }\r\n\r\n        this.indexMask = bufferSize - 1;\r\n        this.entries    = new Object[sequencer.getBufferSize()];\r\n        fill(eventFactory);\r\n    }\r\n<\/pre>\n<p>\u4e0a\u8fd9\u4e9b\u4ee3\u7801\u53ef\u4ee5\u770b\u51fa\uff1a<\/p>\n<ol>\n<li>RingBuffer\u662f\u57fa\u4e8e\u6570\u7ec4\u6784\u5efa\u7684\uff0c\u56e0\u4e3a\u6570\u7ec4\u662f\u7f13\u5b58\u53cb\u597d\u7684\uff0c\u76f8\u90bb\u7684\u5143\u7d20\u4e00\u822c\u5904\u4e8e\u540c\u4e00\u4e2a\u7f13\u5b58\u5757\u3002<\/p>\n<\/li>\n<li>\n<p>\u7f13\u5b58\u7684\u5927\u5c0f\u5fc5\u987b\u662f2\u7684X\u6b21\u65b9\uff0c\u8fd9\u662f\u4e3a\u4e86\u7528\u4f4d\u8fd0\u7b97\u63d0\u9ad8\u6027\u80fd\uff1b\u7531\u4e8e\u6570\u7ec4\u7f13\u5b58\u7684\u5bb9\u91cf\u603b\u662f\u6709\u9650\uff0c\u5f53\u7f13\u5b58\u586b\u6ee1\u540e\uff0c\u53c8\u8981\u4ece \u4e0b\u68070 \u5f00\u59cb\u586b\u5145\uff0c\u5982\u679c\u7f13\u5b58\u5927\u5c0f\u4e0d\u662f2\u7684X\u6b21\u65b9\uff0c\u90a3\u53ea\u80fd\u7528\u6c42\u6a21\u8fd0\u7b97\u6765\u83b7\u5f97\u65b0\u4e0b\u6807\uff0c\u6240\u4ee5\u8fd8\u6709\u4e2aindexMask \u6765\u4fdd\u5b58\u4e0b\u6807\u63a9\u7801\uff1b\u901a\u8fc7\u4e0eindexMask \u8fdb\u884c\u6309\u4f4d\u4e0e\u53ef\u4ee5\u5f97\u5230\u4e00\u4e2a\u5b89\u5168\u7684\u4e0b\u6807\uff0c\u4e0d\u518d\u9700\u8981\u8fdb\u884c\u4e0b\u6807\u68c0\u67e5\uff0c\u5982\uff1a<code>(E)entries[( int)sequence &amp; indexMask ]<\/code>\u3002<\/p>\n<\/li>\n<\/ol>\n<h4>\u4ece\u7f13\u5b58\u83b7\u53d6\u4e8b\u4ef6<\/h4>\n<pre>\r\n\/\/ \u4ece\u7f13\u5b58\u83b7\u53d6\u6307\u5b9a\u5e8f\u53f7\u7684\u4e8b\u4ef6\r\npublic E get(long sequence) {\r\n    \/\/ \u8fd9\u4e2a\u6309\u4f4d\u4e0e\u64cd\u4f5c\u8bf4\u660e\u4e86\u4e3a\u4ec0\u4e48ringBuffer\u7684\u5927\u5c0f\u5fc5\u987b\u662f2\u7684n\u6b21\u65b9\uff1a\u7528\u9ad8\u6548\u7684 \u6309\u4f4d\u4e0e  \u4ee3\u66ff  \u4f4e\u6548\u7684\u6c42\u6a21\u64cd\u4f5c\u3002\r\n    return (E) entries[(int ) sequence & indexMask];\r\n}\r\n<\/pre>\n<h4>\u53d1\u5e03\u4e8b\u4ef6<\/h4>\n<p>\u53d1\u5e03\u4e8b\u4ef6\u67093\u6b65\uff1a\u83b7\u53d6\u65b0\u4e8b\u4ef6\u7684\u5e8f\u53f7\uff0c\u8986\u76d6\u65e7\u4e8b\u4ef6\uff0c\u901a\u77e5\u7b49\u5f85\u7740\u3002\u6700\u7b80\u5355\u7684\u53d1\u5e03\u4e8b\u4ef6\u5f62\u5f0f\uff1a<\/p>\n<pre>\r\npublic void publishEvent(EventTranslator<E> translator) {\r\n    final long sequence = sequencer .next(); \/\/ \u901a\u8fc7\u751f\u4ea7\u8005\u5e8f\u53f7\u63a7\u5236\u5668\u83b7\u53d6\u53ef\u7528\u5e8f\u53f7\r\n    translateAndPublish(translator, sequence);  \/\/ \u8f6c\u6362\u4e8b\u4ef6\u5230\u961f\u5217\u7f13\u5b58\u5e76\u53d1\u5e03\u4e8b\u4ef6\r\n}\r\n\r\nprivate void translateAndPublish(EventTranslator<E> translator, long sequence) {\r\n    try {\r\n        \/\/ \u53d1\u5e03\u4e8b\u4ef6\u524d\u8981\u5148\u83b7\u53d6\u5bf9\u5e94\u4f4d\u7f6e\u4e0a\u7684\u65e7\u4e8b\u4ef6\uff0c\u518d\u7528translator\u628a\u65b0\u4e8b\u4ef6\u7684\u5c5e\u6027\u8f6c\u6362\u5230\u65e7\u4e8b\u4ef6\u7684\u5c5e\u6027\uff0c\u4ece\u800c\u8fbe\u5230\u53d1\u5e03\u7684\u76ee\u7684\u3002\r\n        \/\/ \u8fd9\u5c31\u662f\u8bf4\uff0cDisruptor\u5bf9\u4e8e\u5df2\u6d88\u8d39\u7684\u4e8b\u4ef6\u662f\u4e0d\u5220\u9664\u7684\uff0c\u6709\u65b0\u4e8b\u4ef6\u65f6\u53ea\u662f\u7528\u65b0\u4e8b\u4ef6\u7684\u5c5e\u6027\u53bb\u66ff\u6362\u65e7\u4e8b\u4ef6\u7684\u5c5e\u6027\u3002\r\n        \/\/ \u8fd9\u5e26\u6765\u7684\u4e00\u4e2a\u95ee\u9898\u5c31\u662f\u5185\u5b58\u5360\u7528\r\n        translator.translateTo(get(sequence), sequence);\r\n    } finally {\r\n        sequencer.publish(sequence);     \/\/ \u539f\u5b50\u6027\u5730\u66f4\u65b0\u751f\u4ea7\u8005\u7684\u5e8f\u53f7\uff0c\u5e76\u901a\u77e5\u5728\u7b49\u5f85\u7684\u6d88\u8d39\u8005\u5173\u5361\u3002\r\n    }\r\n}\r\n<\/pre>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u751f\u4ea7\u8005\u5e8f\u53f7\u63a7\u5236\u5668\u4e0e\u6d88\u8d39\u8005\u5173\u5361\u662f\u5171\u7528\u540c\u4e00\u4e2a\u7b49\u5f85\u7b56\u7565\u7684\uff0c\u4e00\u4e2aDisruptor\u5bb9\u5668\u53ea\u6709\u4e00\u4e2a\u7b49\u5f85\u7b56\u7565\u5b9e\u4f8b\u3002<\/p>\n<h3>EventProcessor<\/h3>\n<p>\u4e8b\u4ef6\u5904\u7406\u5668\u7684\u6267\u884c\u5355\u5143\u3002\u6709\u4e24\u4e2a\u5b9e\u73b0\uff1a<code>NoOpEventProcessor<\/code> \u548c <code>BatchEventProcessor<\/code>\uff0c\u5176\u4e2d <code>NoOpEventProcessor<\/code> \u662f\u4e0d\u5904\u7406\u4e8b\u4ef6\u7684\uff0c\u5c31\u4e0d\u5173\u6ce8\u4e86\u3002<\/p>\n<h3>BatchEventProcessor<\/h3>\n<p>Disruptor\u63d0\u4f9b\u7684\u552f\u4e00\u6709\u7528\u7684 <code>EventProcessor<\/code> \u5b9e\u73b0\u7c7b\u3002<\/p>\n<p>Disruptor\u5bb9\u5668\u542f\u52a8\u65f6\uff0c\u4f1a\u8c03\u7528 <code>ConsumerInfo<\/code> \u7684 <code>start<\/code>\u65b9\u6cd5\uff0c\u5982\u679c <code>ConsumerInfo<\/code> \u5c01\u88c5\u7684\u662f\u7528\u6237\u63d0\u4ea4\u7684 <code>EventHandler<\/code> \u5b9e\u4f8b\uff0c\u90a3\u4e48\u4f1a\u5728\u7ebf\u7a0b\u6c60\u91cc\u8fd0\u884c <code>EventProcessor<\/code>\uff0c\u4e5f\u5c31\u662f <code>BatchEventProcessor<\/code> \u5b9e\u4f8b\u7684 <code>run<\/code> \u65b9\u6cd5\u3002<\/p>\n<h4>\u6838\u5fc3run\u65b9\u6cd5<\/h4>\n<p>\u8be5\u65b9\u6cd5\u7684\u6587\u6863\u8bf4\u660e\u63d0\u5230\u8c03\u7528  <code>halt<\/code> \u65b9\u6cd5\u540e\u662f\u53ef\u4ee5\u91cd\u65b0\u6267\u884c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u3002<\/p>\n<pre>\r\npublic void run() {\r\n    \/\/ \u786e\u4fdd\u4e00\u6b21\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c\u6b64\u65b9\u6cd5\uff0c\u8fd9\u6837\u8bbf\u95ee\u81ea\u8eab\u7684\u5e8f\u53f7\u5c31\u4e0d\u8981\u52a0\u9501\r\n    if (! running.compareAndSet(false, true)) {\r\n        throw new IllegalStateException(\"Thread is already running\");\r\n    }\r\n    sequenceBarrier.clearAlert();   \/\/ \u6e05\u9664\u524d\u7f6e\u5e8f\u53f7\u5173\u5361\u7684\u901a\u77e5\u72b6\u6001\r\n\r\n    notifyStart();  \/\/ \u58f0\u660e\u5468\u671f\u901a\u77e5\uff0c\u5f00\u59cb\u524d\u56de\u8c03\r\n\r\n    T event = null;\r\n    long nextSequence = sequence.get() + 1L;    \/\/ sequence\u6307\u5411\u4e0a\u4e00\u4e2a\u5df2\u5904\u7406\u7684\u4e8b\u4ef6\uff0c\u9ed8\u8ba4\u662f-1.\r\n    try {\r\n        while (true ) {\r\n            try {\r\n                \/\/ \u4ece\u5b83\u7684\u524d\u7f6e\u5e8f\u53f7\u5173\u5361\u83b7\u53d6\u4e0b\u4e00\u4e2a\u53ef\u5904\u7406\u7684\u4e8b\u4ef6\u5e8f\u53f7\u3002\r\n                \/\/ \u5982\u679c\u8fd9\u4e2a\u4e8b\u4ef6\u5904\u7406\u5668\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u7684\u4e8b\u4ef6\u5904\u7406\u5668\uff0c\u5219\u524d\u7f6e\u5173\u5361\u5c31\u662f\u751f\u4ea7\u8005\u5e8f\u53f7\uff1b\r\n                \/\/ \u5982\u679c\u8fd9\u4e2a\u4e8b\u4ef6\u5904\u7406\u5668\u4f9d\u8d56\u4e8e1\u4e2a\u6216\u591a\u4e2a\u4e8b\u4ef6\u5904\u7406\u5668\uff0c\u90a3\u4e48\u8fd9\u4e2a\u524d\u7f6e\u5173\u5361\u5c31\u662f\u8fd9\u4e9b\u524d\u7f6e\u4e8b\u4ef6\u5904\u7406\u5668\u4e2d\u6700\u6162\u7684\u4e00\u4e2a\u3002\r\n                \/\/ \u901a\u8fc7\u8fd9\u6837\uff0c\u53ef\u4ee5\u786e\u4fdd\u4e8b\u4ef6\u5904\u7406\u5668\u4e0d\u4f1a\u8d85\u524d\u5904\u7406\u5730\u4e8b\u4ef6\u3002\r\n                final long availableSequence = sequenceBarrier.waitFor(nextSequence);\r\n\r\n                \/\/ \u5904\u7406\u4e00\u6279\u4e8b\u4ef6\r\n                while (nextSequence <= availableSequence) {\r\n                    event = dataProvider.get(nextSequence);\r\n                    eventHandler.onEvent(event, nextSequence, nextSequence == availableSequence);\r\n                    nextSequence++;\r\n                }\r\n\r\n                \/\/ \u8bbe\u7f6e\u5b83\u81ea\u5df1\u6700\u540e\u5904\u7406\u7684\u4e8b\u4ef6\u5e8f\u53f7\uff0c\u8fd9\u6837\u4f9d\u8d56\u4e8e\u5b83\u7684\u5904\u7406\u5668\u53ef\u4ee5\u5b83\u5904\u7406\u521a\u5904\u7406\u8fc7\u7684\u4e8b\u4ef6\u3002\r\n                sequence.set(availableSequence);\r\n            } catch (final TimeoutException e) {\r\n                \/\/ \u83b7\u53d6\u4e8b\u4ef6\u5e8f\u53f7\u8d85\u65f6\u5904\u7406\r\n                notifyTimeout( sequence.get());\r\n\r\n            } catch (final AlertException ex) {\r\n                \/\/ \u5904\u7406\u901a\u77e5\u4e8b\u4ef6\uff1b\u68c0\u6d4b\u662f\u5426\u8981\u505c\u6b62\uff0c\u5982\u679c\u975e\u5219\u7ee7\u7eed\u5904\u7406\u4e8b\u4ef6\r\n                if (!running .get()) {\r\n                    break;\r\n                }\r\n            } catch (final Throwable ex) {\r\n                \/\/ \u5176\u4ed6\u5f02\u5e38\uff0c\u7528\u4e8b\u4ef6\u5904\u7406\u5668\u5904\u7406\uff1b\u7136\u540e\u7ee7\u7eed\u5904\u7406\u4e0b\u4e00\u4e2a\u4e8b\u4ef6\r\n                exceptionHandler.handleEventException(ex, nextSequence, event);\r\n                sequence.set(nextSequence);\r\n                nextSequence++;\r\n            }\r\n        }\r\n    } finally {\r\n        \/\/ \u58f0\u660e\u5468\u671f\u901a\u77e5\uff0c\u505c\u6b62\u4e8b\u4ef6\u56de\u8c03\uff1b\u590d\u4f4d\u8fd0\u884c\u72b6\u6001\u6807\u5fd7\uff0c\u786e\u4fdd\u53ef\u4ee5\u518d\u6b21\u8fd0\u884c\u6b64\u65b9\u6cd5\u3002\r\n        notifyShutdown();\r\n        running.set(false );\r\n    }\r\n}\r\n<\/pre>\n<p>\u4ece <code>while<\/code> \u5faa\u73af\u53ef\u4ee5\u770b\u51fa\uff0c\u4e8b\u4ef6\u5904\u7406\u53ef\u4ee5\u5206\u4e3a\u4e09\u6b65\uff1a<\/p>\n<ol>\n<li>\u4ece <code>SequenceBarrier<\/code> \u83b7\u53d6\u83b7\u53d6\u53ef\u4ee5\u5904\u7406\u7684\u6700\u5927\u4e8b\u4ef6\u5e8f\u53f7\uff1b<\/li>\n<li>\u5faa\u73af\u5904\u7406\u53ef\u5904\u7406\u4e8b\u4ef6\uff1b<\/li>\n<li>\u66f4\u65b0\u81ea\u8eab\u7684\u5df2\u5904\u7406\u7684\u4e8b\u4ef6\u5e8f\u53f7\uff0c\u8ba9\u4f9d\u8d56\u81ea\u8eab\u7684\u4e8b\u4ef6\u5904\u7406\u5668\u53ef\u4ee5\u7ee7\u7eed\u5904\u7406\u3002<\/li>\n<\/ol>\n<p><code>sequence .set<\/code> \u548c <code>sequence .get<\/code> \u65b9\u6cd5\u90fd\u662f\u539f\u5b50\u6027\u5730\u8bfb\u53d6\u3001\u66f4\u65b0\u5e8f\u53f7\u7684\uff0c\u8fd9\u6837\u5c31\u907f\u514d\u4e86\u52a0\u9501\uff0c\u4ece\u800c\u63d0\u4f9b\u6027\u80fd\u3002<br \/>\n<code>sequenceBarrier .waitFor<\/code> \u6700\u7ec8\u4e5f\u4f1a\u8c03\u7528 <code>sequence .get<\/code> \u65b9\u6cd5\u3002<\/p>\n<h3>SequenceBarrier<\/h3>\n<p>\u534f\u4f5c\u5f0f\u5173\u5361\uff0c\u7528\u4e8e\u8ddf\u8e2a\u751f\u4ea7\u8005\u6e38\u6807\u548c\u4f9d\u8d56\u7684\u4e8b\u4ef6\u5904\u7406\u5668\u7684\u5e8f\u53f7\u7684\u6570\u636e\u7ed3\u6784\u3002\u6709\u4e24\u4e2a\u5b9e\u73b0 <code>DummySequenceBarrier<\/code> \u548c <code>ProcessingSequenceBarrier<\/code>\uff0c\u7c7b\u5982\u5176\u540d\uff0c\u524d\u8005\u662f\u865a\u62df\u7684\uff0c\u53ea\u6709\u7a7a\u65b9\u6cd5\uff1b\u540e\u8005\u662f\u5b9e\u7528\u7684\u3002<\/p>\n<h4>SequenceBarrier\u63a5\u53e3\u5b9a\u4e49<\/h4>\n<pre>\r\npublic interface SequenceBarrier {\r\n          \/\/ \u7b49\u5f85\u6307\u5b9a\u7684\u5e8f\u53f7\u53d8\u5f97\u53ef\u6d88\u8d39\r\n     long waitFor(long sequence) throws AlertException, InterruptedException, TimeoutException;\r\n\r\n          \/\/ \u8fd4\u56de\u5f53\u524d\u53ef\u8bfb\u7684\u6e38\u6807\uff08\u4e00\u4e2a\u5e8f\u53f7\uff09\r\n     long getCursor();\r\n\r\n         \/\/ \u5f53\u524d\u662f\u5426\u6709\u901a\u77e5\u72b6\u6001\u7ed9\u6b64\u5173\u5361\r\n     boolean isAlerted();\r\n\r\n     \/\/ \u901a\u77e5\u4e8b\u4ef6\u5904\u7406\u5668\u72b6\u6001\u53d1\u751f\u6539\u53d8\uff0c\u5e76\u4fdd\u6301\u8fd9\u4e2a\u72b6\u6001\u76f4\u5230\u88ab\u6e05\u9664\r\n     void alert();\r\n\r\n     \/\/ \u6e05\u9664\u5f53\u524d\u901a\u77e5\u72b6\u6001\r\n     void clearAlert();\r\n\r\n     \/\/ \u68c0\u67e5\u901a\u77e5\u72b6\u6001\uff0c\u5982\u679c\u6709\u5f02\u5e38\u5219\u629b\u51fa\r\n     void checkAlert() throws AlertException;\r\n<\/pre>\n<h4>ProcessingSequenceBarrier<\/h4>\n<h5>\u751f\u6210<\/h5>\n<p>ProcessingSequenceBarrier\u7684\u5b9e\u4f8b\u662f\u7531\u6846\u67b6\u63a7\u5236\u7684\u3002<\/p>\n<pre>\r\n\u9996\u5148\u5728Disruptor\u7c7b\u7684createEventProcessors\u65b9\u6cd5\u5185\uff1a\r\nfinal SequenceBarrier barrier = ringBuffer.newBarrier(barrierSequences);    \/\/ \u83b7\u53d6\u524d\u7f6e\u7684\u5e8f\u53f7\u5173\u5361\r\n\r\nRingBufferd \u7684newBarrier\u65b9\u6cd5\uff1a\r\npublic SequenceBarrier newBarrier(Sequence... sequencesToTrack) {\r\n    return sequencer.newBarrier(sequencesToTrack);     \/\/ \u662f\u901a\u8fc7\u751f\u4ea7\u8005\u5e8f\u53f7\u63a7\u5236\u5668\u751f\u6210\u7684\u3002\r\n}\r\n\r\nAbstractSequencer\u7684newBarrier\u65b9\u6cd5\u3002\r\npublic SequenceBarrier newBarrier(Sequence... sequencesToTrack) {\r\n    return new ProcessingSequenceBarrier(this, waitStrategy, cursor, sequencesToTrack);\r\n}\r\n<\/pre>\n<h5>\u6784\u9020\u51fd\u6570<\/h5>\n<pre>\r\n\/**\r\n * @param sequencer \u751f\u4ea7\u8005\u5e8f\u53f7\u63a7\u5236\u5668\r\n * @param waitStrategy \u7b49\u5f85\u7b56\u7565\r\n * @param cursorSequence \u751f\u4ea7\u8005\u5e8f\u53f7\r\n * @param dependentSequences \u4f9d\u8d56\u7684Sequence\r\n *\/\r\npublic ProcessingSequenceBarrier(final Sequencer sequencer, final WaitStrategy waitStrategy,\r\n                                 final Sequence cursorSequence, final Sequence[] dependentSequences) {\r\n    this. sequencer = sequencer;\r\n    this. waitStrategy = waitStrategy;\r\n    this. cursorSequence = cursorSequence;\r\n\r\n    \/\/ \u5982\u679c\u4e8b\u4ef6\u5904\u7406\u5668\u4e0d\u4f9d\u8d56\u4e8e\u4efb\u4f55\u524d\u7f6e\u5904\u7406\u5668\uff0c\u90a3\u4e48dependentSequence\u4e5f\u6307\u5411\u751f\u4ea7\u8005\u7684\u5e8f\u53f7\u3002\r\n    if (0 == dependentSequences. length) {\r\n        dependentSequence = cursorSequence;\r\n    } else {     \/\/ \u5982\u679c\u6709\u591a\u4e2a\u524d\u7f6e\u5904\u7406\u5668\uff0c\u5219\u5bf9\u5176\u8fdb\u884c\u5c01\u88c5\uff0c\u5b9e\u73b0\u4e86\u7ec4\u5408\u6a21\u5f0f\u3002\r\n        dependentSequence = new FixedSequenceGroup(dependentSequences);\r\n    }\r\n}\r\n<\/pre>\n<h5>\u83b7\u53d6\u5e8f\u53f7\u7684\u65b9\u6cd5<\/h5>\n<pre>\r\n\/**\r\n * \u8be5\u65b9\u6cd5\u4e0d\u4fdd\u8bc1\u603b\u662f\u8fd4\u56de\u672a\u5904\u7406\u7684\u5e8f\u53f7\uff1b\u5982\u679c\u6709\u66f4\u591a\u7684\u53ef\u5904\u7406\u5e8f\u53f7\u65f6\uff0c\u8fd4\u56de\u7684\u5e8f\u53f7\u4e5f\u53ef\u80fd\u662f\u8d85\u8fc7\u6307\u5b9a\u5e8f\u53f7\u7684\u3002\r\n *\/\r\npublic long waitFor(final long sequence) throws AlertException, InterruptedException, TimeoutException {\r\n    \/\/ \u9996\u5148\u68c0\u67e5\u6709\u65e0\u901a\u77e5\r\n    checkAlert();\r\n\r\n    \/\/ \u901a\u8fc7\u7b49\u5f85\u7b56\u7565\u6765\u83b7\u53d6\u53ef\u5904\u7406\u4e8b\u4ef6\u5e8f\u53f7\uff0c\r\n    long availableSequence = waitStrategy.waitFor(sequence, cursorSequence, dependentSequence , this);\r\n\r\n    \/\/ \u8fd9\u4e2a\u65b9\u6cd5\u4e0d\u4fdd\u8bc1\u603b\u662f\u8fd4\u56de\u53ef\u5904\u7406\u7684\u5e8f\u53f7\r\n        return availableSequence;\r\n    if (availableSequence < sequence) {\r\n    }\r\n\r\n    \/\/ \u518d\u901a\u8fc7\u751f\u4ea7\u8005\u5e8f\u53f7\u63a7\u5236\u5668\u8fd4\u56de\u6700\u5927\u7684\u53ef\u5904\u7406\u5e8f\u53f7\r\n    return sequencer.getHighestPublishedSequence(sequence, availableSequence);\r\n}\r\n<\/pre>\n<h3>WaitStrategy<\/h3>\n<p>WaitStrategy\u5b9a\u4e49\u4e86\u4e00\u4e2aEventProcessor\u5728Sequence\u6ca1\u6709\u53ef\u6d88\u8d39\u4e8b\u4ef6\u65f6\u7684\u7b49\u5f85\u7b56\u7565\u3002<\/p>\n<h4>\u63a5\u53e3\u5b9a\u4e49<\/h4>\n<pre>\r\npublic interface WaitStrategy {\r\n    \/**\r\n          * \u5982\u679c\u4e8b\u4ef6\u5904\u7406\u5668\u4e0d\u4f9d\u8d56\u4e8e\u4efb\u4f55\u524d\u7f6e\u5904\u7406\u5668\uff0c\u90a3\u4e48cursor\u4e0edependentSequence\u90fd\u5c06\u6307\u5411\u751f\u4ea7\u8005\u7684\u5e8f\u53f7\u3002\r\n          * \r\n     * sequence\uff1a\u8981\u83b7\u53d6\u7684\u5e8f\u53f7\r\n     * cursor\uff1a\u6307\u5411\u4e86\u751f\u4ea7\u8005\u7684Sequence\r\n     * dependentSequence\uff1a\u8c03\u7528\u8005\u4f9d\u8d56\u7684\u524d\u7f6e\u5173\u5361\r\n     * barrier\uff1a\u8c03\u7528\u8005\u81ea\u8eab\uff0c\u901a\u8fc7\u8c03\u7528barrier.checkAlert\u53ef\u4ee5\u53ca\u65f6\u54cd\u5e94\u901a\u77e5\r\n     *\/\r\n    long waitFor( long sequence, Sequence cursor, Sequence dependentSequence, SequenceBarrier barrier)\r\n        throws AlertException, InterruptedException, TimeoutException;\r\n\r\n     \/\/ \u5f53\u6e38\u6807\u524d\u8fdb\u7684\u65f6\u5019\uff08\u6709\u53ef\u5904\u7406\u7684\u4e8b\u4ef6\uff09\u901a\u77e5EventProcessor\r\n    void signalAllWhenBlocking();\r\n}\r\n<\/pre>\n<h4>\u5b9e\u73b0<\/h4>\n<p>BlockingWaitStrategy\uff1a\u6ca1\u6709\u53ef\u6d88\u8d39\u4e8b\u4ef6\u65f6\u963b\u585e\u7b49\u5f85\u751f\u4ea7\u8005\u5524\u9192\u3002<\/p>\n<p>BusySpinWaitStrategy\uff1a\u5fd9\u7b49\u7b56\u7565\u3002<\/p>\n<p>PhasedBackoffWaitStrategy\uff1a<\/p>\n<p>TimeoutBlockingWaitStrategy\uff1a<\/p>\n<p>YieldingWaitStrategy\uff1a\u901a\u8fc7\u8c03\u7528<code>Thread.yield<\/code>\u65b9\u6cd5\u6765\u8ba9\u51faCPU\uff0c\u8fbe\u5230\u7b49\u5f85\u7684\u76ee\u7684\uff0c\u7b49\u5f85\u65f6\u957f\u6ca1\u4fdd\u8bc1\uff0c\u53d6\u51b3\u4e8e\u7ebf\u7a0b\u7684\u8c03\u5ea6\u7cfb\u7edf\u3002<\/p>\n<h2>\u5c0f\u7ed3<\/h2>\n<p>\u901a\u8fc7\u7f13\u51b2\u884c\u586b\u5145\u548c\u9002\u5f53\u7684\u5c01\u88c5\uff0cDisruptor\u63d0\u4f9b\u4e86\u4e00\u4e2aCPU\u53cb\u597d\u3001\u7ebf\u7a0b\u5b89\u5168\u7684\u5e8f\u53f7\u8868\u793a\u3002<\/p>\n<p>\u901a\u8fc7\u6bcf\u4e2a\u6d88\u8d39\u8005\u6301\u6709\u81ea\u5df1\u7684\u4e8b\u4ef6\u5e8f\u53f7\uff0c\u6ca1\u6709\u76f8\u4e92\u4f9d\u8d56\u7684\u6d88\u8d39\u8005\u53ef\u4ee5\u5e76\u884c\u5730\u5904\u7406\u4e8b\u4ef6\u3002\u5728\u6d88\u8d39\u8005\u4e4b\u95f4\u5f15\u5165\u6d88\u8d39\u8005\u5173\u5361\uff0c\u8f7b\u6613\u5730\u5b9e\u73b0\u4e86\u6d88\u8d39\u8005\u4e4b\u95f4\u7684\u524d\u540e\u4f9d\u8d56\u5173\u7cfb\u3002<\/p>\n<p>\u5bf9\u4e8e\u751f\u4ea7\u8005\uff0c\u5373\u4f7f\u6709\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\uff0c\u7531\u4e8e\u4ed6\u4eec\u90fd\u901a\u8fc7\u5e8f\u53f7\u5668Sequencer\u8bbf\u95eeringBuffer\uff0cDisruptor\u6846\u67b6\u901a\u8fc7CAS\u53d6\u4ee3\u4e86\u52a0\u9501\u548c\u540c\u6b65\u5757\uff0c\u8fd9\u4e5f\u662f\u5e76\u53d1\u7f16\u7a0b\u7684\u4e00\u4e2a\u6307\u5bfc\u539f\u5219\uff1a\u628a\u540c\u6b65\u5757\u6700\u5c0f\u5316\u5230\u4e00\u4e2a\u53d8\u91cf\u4e0a\u3002<\/p>\n<p>\u901a\u8fc7\u539f\u5b50\u8bfb\u5199\u5e8f\u53f7\u3001CAS\u64cd\u4f5c\u6d88\u9664\u4e86\u5bf9\u9501\u7684\u4f7f\u7528\uff0c\u63d0\u9ad8\u4e86\u6027\u80fd\u3002<\/p>\n<p>Distuptor\u7684\u4e00\u4e2a\u7f3a\u70b9\u662f\u5185\u5b58\u5360\u7528\uff1a\u56e0\u4e3a\u5b83\u4e0d\u6e05\u9664\u65e7\u4e8b\u4ef6\u6570\u636e\u3002<\/p>\n<hr\/>\n<p>\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: <strong>coderbee\u7b14\u8bb0<\/strong>\uff0c\u53ef\u4ee5\u66f4\u53ca\u65f6\u56de\u590d\u4f60\u7684\u8ba8\u8bba\u3002<br \/>\n<img loading=\"lazy\" decoding=\"async\" width=\"258\" height=\"258\" src=\"https:\/\/coderbee.net\/wp-content\/uploads\/2019\/01\/coderbee-note.jpg\" class=\"alignnone size-full wp-image-1707\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001Disruptor \u662f\u4ec0\u4e48\uff1f Disruptor \u662f\u4e00\u4e2a\u9ad8\u6027\u80fd\u5f02\u6b65\u5904\u7406\u6846\u67b6\uff0c &hellip; <a href=\"https:\/\/coderbee.net\/index.php\/open-source\/20130812\/400\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77],"tags":[79,78],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/400"}],"collection":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/comments?post=400"}],"version-history":[{"count":10,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/400\/revisions"}],"predecessor-version":[{"id":401,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/400\/revisions\/401"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=400"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=400"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}