{"id":47136,"date":"2022-08-02T04:31:53","date_gmt":"2022-08-08T11:08:04","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java-atomiclong%e5%ae%9e%e7%8e%b0%e5%8d%95%e7%ba%bf%e7%a8%8b%e4%bf%9d%e8%af%81%ef%bc%88%e5%8f%82%e8%80%83kafka%ef%bc%89%e3%80%82\/"},"modified":"2024-01-15T12:18:14","modified_gmt":"2024-01-15T04:18:14","slug":"%e4%bd%bf%e7%94%a8java-atomiclong%e5%ae%9e%e7%8e%b0%e5%8d%95%e7%ba%bf%e7%a8%8b%e4%bf%9d%e8%af%81%ef%bc%88%e5%8f%82%e8%80%83kafka%ef%bc%89%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8java-atomiclong%e5%ae%9e%e7%8e%b0%e5%8d%95%e7%ba%bf%e7%a8%8b%e4%bf%9d%e8%af%81%ef%bc%88%e5%8f%82%e8%80%83kafka%ef%bc%89%e3%80%82\/","title":{"rendered":"\u4f7f\u7528Java AtomicLong\u5b9e\u73b0\u5355\u7ebf\u7a0b\u4fdd\u8bc1\uff08\u53c2\u8003kafka\uff09"},"content":{"rendered":"

\u5f53\u67e5\u770b KafkaConsumer \u7c7b\u7684 poll() \u65b9\u6cd5\u9644\u8fd1\u7684\u6e90\u4ee3\u7801\u65f6\uff0c\u6ce8\u610f\u5230\u5b83\u4f7f\u7528 AtomicLong \u6765\u4fdd\u8bc1\u5355\u7ebf\u7a0b\u6267\u884c\u7684\u3002\u7531\u4e8e\u8fd9\u4e2a\u601d\u8def\u975e\u5e38\u7cbe\u5999\uff0c\u56e0\u6b64\u6211\u4e5f\u8bd5\u4e86\u4e00\u4e2a\u81ea\u5df1\u7684\u7248\u672c\u5e76\u9644\u4e0a\u4e86\u3002<\/p>\n

\uff08\u53c2\u8003\uff1aKafka\u6d88\u8d39\u8005\u7684poll()\u65b9\u6cd5\uff09<\/p>\n

\r\nimport<\/span> java.util.concurrent.atomic.AtomicLong<\/span>;<\/span>\r\nimport<\/span> java.util.concurrent.atomic.AtomicInteger<\/span>;<\/span>\r\n\r\n\r\npublic<\/span> class<\/span> Main<\/span> {<\/span>\r\n\r\n\r\n    private<\/span> static<\/span> final<\/span> Long<\/span> NO_CURRENT_THREAD<\/span> =<\/span> -<\/span>1L<\/span>;<\/span>\r\n    private<\/span> static<\/span> final<\/span> AtomicLong<\/span> currentThread<\/span> =<\/span> new<\/span> AtomicLong<\/span>(<\/span>NO_CURRENT_THREAD<\/span>);<\/span>\r\n\r\n    private<\/span> static<\/span> final<\/span> AtomicInteger<\/span> refcount<\/span> =<\/span> new<\/span> AtomicInteger<\/span>(<\/span>0<\/span>);<\/span>\r\n\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> throws<\/span> Exception<\/span> {<\/span>\r\n\r\n        refcount<\/span>.<\/span>incrementAndGet<\/span>();<\/span>\r\n\r\n        currentThread<\/span>.<\/span>incrementAndGet<\/span>();<\/span>\r\n\r\n        Thread<\/span>.<\/span>sleep<\/span>(<\/span>199<\/span>);<\/span>\r\n\r\n        release<\/span>();<\/span>\r\n\r\n        Thread<\/span>.<\/span>sleep<\/span>(<\/span>199<\/span>);<\/span>\r\n\r\n        acquire<\/span>();<\/span>    \r\n    }<\/span>\r\n\r\n     public<\/span> static<\/span> void<\/span> acquire<\/span>()<\/span> {<\/span>\r\n        long<\/span> threadId<\/span> =<\/span> Thread<\/span>.<\/span>currentThread<\/span>().<\/span>getId<\/span>();<\/span>\r\n        if<\/span> (<\/span>threadId<\/span> !=<\/span> currentThread<\/span>.<\/span>get<\/span>()<\/span> &&<\/span> !<\/span>currentThread<\/span>.<\/span>compareAndSet<\/span>(<\/span>NO_CURRENT_THREAD<\/span>,<\/span> threadId<\/span>))<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"this is not safe for multi-threaded access\"<\/span>);<\/span>\r\n\r\n        refcount<\/span>.<\/span>incrementAndGet<\/span>();<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>threadId<\/span>);<\/span>\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>currentThread<\/span>);<\/span>\r\n    }<\/span>\r\n\r\n    private<\/span> static<\/span> void<\/span> release<\/span>()<\/span> {<\/span>\r\n\r\n        if<\/span>(<\/span>refcount<\/span>.<\/span>decrementAndGet<\/span>()<\/span> ==<\/span> 0<\/span>)<\/span>\r\n            currentThread<\/span>.<\/span>set<\/span>(<\/span>NO_CURRENT_THREAD<\/span>);<\/span>    \r\n    }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
KafkaConsumer\u7684\u6e90\u4ee3\u7801<\/h1>\n
\r\n\r\n    private<\/span> ConsumerRecords<\/span><<\/span>K<\/span>,<\/span> V<\/span>><\/span> poll<\/span>(<\/span>final<\/span> Timer<\/span> timer<\/span>,<\/span> final<\/span> boolean<\/span> includeMetadataInTimeout<\/span>)<\/span> {<\/span>\r\n        acquireAndEnsureOpen<\/span>();<\/span>\r\n        try<\/span> {<\/span>\r\n            if<\/span> (<\/span>this<\/span>.<\/span>subscriptions<\/span>.<\/span>hasNoSubscriptionOrUserAssignment<\/span>())<\/span> {<\/span>\r\n                throw<\/span> new<\/span> IllegalStateException<\/span>(<\/span>\"Consumer is not subscribed to any topics or assigned any partitions\"<\/span>);<\/span>\r\n            }<\/span>\r\n\r\n            \/\/ poll for new data until the timeout expires<\/span>\r\n            do<\/span> {<\/span>\r\n                client<\/span>.<\/span>maybeTriggerWakeup<\/span>();<\/span>\r\n\r\n                if<\/span> (<\/span>includeMetadataInTimeout<\/span>)<\/span> {<\/span>\r\n                    if<\/span> (!<\/span>updateAssignmentMetadataIfNeeded<\/span>(<\/span>timer<\/span>))<\/span> {<\/span>\r\n                        return<\/span> ConsumerRecords<\/span>.<\/span>empty<\/span>();<\/span>\r\n                    }<\/span>\r\n                }<\/span> else<\/span> {<\/span>\r\n                    while<\/span> (!<\/span>updateAssignmentMetadataIfNeeded<\/span>(<\/span>time<\/span>.<\/span>timer<\/span>(<\/span>Long<\/span>.<\/span>MAX_VALUE<\/span>)))<\/span> {<\/span>\r\n                        log<\/span>.<\/span>warn<\/span>(<\/span>\"Still waiting for metadata\"<\/span>);<\/span>\r\n                    }<\/span>\r\n                }<\/span>\r\n\r\n                final<\/span> Map<\/span><<\/span>TopicPartition<\/span>,<\/span> List<\/span><<\/span>ConsumerRecord<\/span><<\/span>K<\/span>,<\/span> V<\/span>>>><\/span> records<\/span> =<\/span> pollForFetches<\/span>(<\/span>timer<\/span>);<\/span>\r\n                if<\/span> (!<\/span>records<\/span>.<\/span>isEmpty<\/span>())<\/span> {<\/span>\r\n                    \/\/ before returning the fetched records, we can send off the next round of fetches<\/span>\r\n                    \/\/ and avoid block waiting for their responses to enable pipelining while the user<\/span>\r\n                    \/\/ is handling the fetched records.<\/span>\r\n                    \/\/<\/span>\r\n                    \/\/ NOTE: since the consumed position has already been updated, we must not allow<\/span>\r\n                    \/\/ wakeups or any other errors to be triggered prior to returning the fetched records.<\/span>\r\n                    if<\/span> (<\/span>fetcher<\/span>.<\/span>sendFetches<\/span>()<\/span> ><\/span> 0<\/span> ||<\/span> client<\/span>.<\/span>hasPendingRequests<\/span>())<\/span> {<\/span>\r\n                        client<\/span>.<\/span>pollNoWakeup<\/span>();<\/span>\r\n                    }<\/span>\r\n\r\n                    return<\/span> this<\/span>.<\/span>interceptors<\/span>.<\/span>onConsume<\/span>(<\/span>new<\/span> ConsumerRecords<\/span><>(<\/span>records<\/span>));<\/span>\r\n                }<\/span>\r\n            }<\/span> while<\/span> (<\/span>timer<\/span>.<\/span>notExpired<\/span>());<\/span>\r\n\r\n            return<\/span> ConsumerRecords<\/span>.<\/span>empty<\/span>();<\/span>\r\n        }<\/span> finally<\/span> {<\/span>\r\n            release<\/span>();<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u67e5\u770b KafkaConsumer \u7c7b\u7684 poll() \u65b9\u6cd5\u9644\u8fd1\u7684\u6e90\u4ee3\u7801\u65f6\uff0c\u6ce8\u610f\u5230\u5b83\u4f7f\u7528 AtomicLong […]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-47136","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u4f7f\u7528Java AtomicLong\u5b9e\u73b0\u5355\u7ebf\u7a0b\u4fdd\u8bc1\uff08\u53c2\u8003kafka\uff09 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528java-atomiclong\u5b9e\u73b0\u5355\u7ebf\u7a0b\u4fdd\u8bc1\uff08\u53c2\u8003kafka\uff09\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u4f7f\u7528Java AtomicLong\u5b9e\u73b0\u5355\u7ebf\u7a0b\u4fdd\u8bc1\uff08\u53c2\u8003kafka\uff09\" \/>\n<meta property=\"og:description\" content=\"\u5f53\u67e5\u770b KafkaConsumer \u7c7b\u7684 poll() \u65b9\u6cd5\u9644\u8fd1\u7684\u6e90\u4ee3\u7801\u65f6\uff0c\u6ce8\u610f\u5230\u5b83\u4f7f\u7528 AtomicLong […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u4f7f\u7528java-atomiclong\u5b9e\u73b0\u5355\u7ebf\u7a0b\u4fdd\u8bc1\uff08\u53c2\u8003kafka\uff09\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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