{"id":1163,"date":"2022-11-16T16:41:58","date_gmt":"2022-11-16T08:41:58","guid":{"rendered":"http:\/\/refusea.com\/?p=1163"},"modified":"2022-11-16T16:48:47","modified_gmt":"2022-11-16T08:48:47","slug":"redis-%e5%ae%9e%e7%8e%b0-cas-%e5%8f%8a-redis-%e4%ba%8b%e5%8a%a1%e7%9a%84%e5%9d%91","status":"publish","type":"post","link":"https:\/\/refusea.com\/?p=1163","title":{"rendered":"redis \u5b9e\u73b0 CAS \u53ca redis \u4e8b\u52a1\u7684\u5751"},"content":{"rendered":"

CAS<\/h2>\n

Compare And Swap\uff0c\u5373 CAS\uff0c\u662f\u4e00\u79cd\u4e50\u89c2\u9501\uff0cjava \u7684\u539f\u5b50\u7c7b\u5c31\u662f\u5229\u7528\u7684 CAS \u6765\u5b9e\u73b0\u4e86\u5e76\u53d1\u65f6\u7684\u65e0\u9501\u4fee\u6539<\/p>\n

\u5176\u6838\u5fc3\u8981\u70b9\u5c31\u662f\uff0c\u5f53\u539f\u503c\u548c\u6307\u5b9a\u7684\u503c\u76f8\u7b49\u65f6\uff0c\u624d\u4f1a\u7528\u65b0\u7684\u503c\u53bb\u66ff\u6362\u539f\u503c\uff0c\u5426\u5219\u4e0d\u4f1a\u66ff\u6362\u539f\u503c<\/p>\n

redis \u7684 CAS<\/h2>\n

\u60f3\u4e00\u4e0b\uff0c\u5982\u4e0b\u7684\u9700\u6c42\u8981\u600e\u4e48\u505a<\/p>\n

\n

\u8981\u5220\u9664 redis \u7684\u67d0\u4e2a key\uff0c\u6761\u4ef6\u662f\u8be5 key \u7684\u503c\u662f\u6211\u4eec\u6307\u5b9a\u7684\u503c<\/p>\n<\/blockquote>\n

\u7b80\u5355\u7684\u5199\u4e2a\u65b9\u6cd5\u5982\u4e0b<\/p>\n

public void delete(String key, String value) {\n    if(value.equals(jedis.get(key))) {\n        jedis.del(key);\n    }\n}<\/code><\/pre>\n
\u8fd9\u6837\u7684\u5b9e\u73b0\u662f\u6709\u9690\u60a3\u7684\uff0c\u6211\u4eec\u5148\u8981 get \u5230 value\uff0c\u7136\u540e\u518d del key\uff0c\u95ee\u9898\u662f\u5728\u6211\u4eec get \u4e4b\u540e\uff0cdel \u4e4b\u524d\uff0ckey \u7684 value \u662f\u53ef\u80fd\u88ab\u4fee\u6539\u7684<\/p>\n
\u8003\u8651\u5230 redis \u662f\u5355\u7ebf\u7a0b\u6267\u884c\uff0c\u5982\u679c\u80fd\u786e\u4fdd get \u548c del \u4e4b\u95f4\u4e0d\u4f1a\u6709\u522b\u7684\u547d\u4ee4\u6267\u884c\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u5c31\u662f\u53ef\u884c\u7684\uff0cbut \u8fd9\u4e2a\u5f88\u96be\u4fdd\u8bc1\uff0c\u6211\u60f3\u8fc7\u7528 pipeline\uff0c\u4f46\u662f\u5728 pipeline \u7684\u6267\u884c\u8fc7\u7a0b\u91cc\uff0c\u65e0\u6cd5\u5f97\u5230 get \u7684 value\uff0c\u884c\u4e0d\u901a<\/p>\n
watch<\/h3>\n
\u524d\u9762\u7684\u9700\u6c42\u5c31\u662f\u5f88\u5178\u578b\u7684 CAS\uff0credis \u7684 del \u539f\u751f\u5e76\u672a\u63d0\u4f9b CAS\uff0c\u4e0d\u8fc7 redis \u7684\u4e8b\u52a1\u6709\u4e2a watch \u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u6765\u5b9e\u73b0 CAS<\/p>\n
\u5f53\u6211\u4eec watch \u4e86\u67d0\u4e2a\uff08\u6216\u591a\u4e2a\uff09 key \u4ee5\u540e\uff0c\u5f00\u542f\u4e8b\u52a1\u5bf9 key \u8fdb\u884c\u4fee\u6539\uff0c\u5982\u679c\u8fd9\u4e2a key \u7684\u503c\u5728\u6211\u4eec watch \u4ee5\u540e\u88ab\u4fee\u6539\u8fc7\uff0c\u90a3\u4e48\u4e8b\u52a1\u63d0\u4ea4\u65f6\u5c06\u4e0d\u4f1a\u88ab\u6267\u884c<\/p>\n
\u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5\u5982\u4e0b\u5b9e\u73b0<\/p>\n
public void delete(String key, String value) {\n\n    jedis.watch(key);\n    if (value.equals(jedis.get(key))) {\n        Transaction tx = jedis.multi();\n        tx.del(key);\n        tx.exec();\n    } else {\n        jedis.unwatch();\n    }\n\n}<\/code><\/pre>\n
redis \u4e8b\u52a1\u7684\u4e00\u4e2a\u5c0f\u5751<\/h2>\n
\u8bdd\u8bf4\u4f7f\u7528 watch \u6765\u8fdb\u884c CAS \u7684\u5220\u9664\u540e\u4e00\u76f4\u5f88 OK\uff0c\u67d0\u5929\u56e0\u4e3a\u67d0\u4e2a\u9700\u6c42\uff0c\u6211\u5bf9\u4e0a\u8ff0\u7684\u5220\u9664\u8fdb\u884c\u4e86\u5c0f\u5c0f\u7684\u4fee\u6539\uff0c\u5728\u5220\u9664 key \u7684\u65f6\u5019\uff0c\u987a\u4fbf\u5220\u9664\u4e86\u53e6\u4e00\u4e2a\u5173\u8054\u7684 key\uff0c\u4ee3\u7801\u5982\u4e0b<\/p>\n
public void delete(String key, String value, String key2) {\n\n    jedis.watch(key);\n    if (value.equals(jedis.get(key))) {\n        Transaction tx = jedis.multi();\n        tx.del(key);\n        tx.del(key2);\n        tx.exec();\n    } else {\n        jedis.unwatch();\n    }\n\n}<\/code><\/pre>\n
\u5728\u6d4b\u8bd5\u73af\u5883\u4e00\u5207\u6b63\u5e38\uff0c\u53d1\u5e03\u5230\u751f\u4ea7\u73af\u5883\u540e\uff0c\u629b\u51fa\u5982\u4e0b\u5f02\u5e38<\/p>\n
ERR keys of command in MULTI calls must be in same slot\nredis.clients.jedis.exceptions.JedisDataException: ERR keys of command in MULTI calls must be in same slot\n    at redis.clients.jedis.Protocol.processError(Protocol.java:135)\n    at redis.clients.jedis.Protocol.process(Protocol.java:169)\n    at redis.clients.jedis.Protocol.read(Protocol.java:223)\n    at redis.clients.jedis.Connection.readProtocolWithCheckingBroken(Connection.java:352)\n    at redis.clients.jedis.Connection.getUnflushedObjectMultiBulkReply(Connection.java:314)\n    at redis.clients.jedis.Connection.getObjectMultiBulkReply(Connection.java:319)\n    at redis.clients.jedis.Transaction.exec(Transaction.java:46)<\/code><\/pre>\n
\u8fd9\u4e2a\u5f02\u5e38\u662f\u7b2c\u4e00\u6b21\u9047\u5230\uff0c\u5728\u7f51\u4e0a\u641c\u7d22\u4e00\u756a\uff0c\u539f\u56e0\u662f\u5728\u4e8b\u52a1\u91cc\u64cd\u4f5c\u7684\u591a\u4e2a key\uff0c\u4e0d\u5728\u540c\u4e00\u4e2a\u8282\u70b9\u4e0a<\/p>\n
\u4e3a\u4ec0\u4e48\u6d4b\u8bd5\u73af\u5883\u4ece\u6765\u6ca1\u6709\u9047\u5230\u95ee\u9898\u5462\uff1f\u56e0\u4e3a\u6211\u4eec\u6d4b\u8bd5\u73af\u5883\u662f\u5355\u8282\u70b9 redis\uff0c\u800c\u751f\u4ea7\u73af\u5883\u662f 8 \u8282\u70b9\u7684 redis \u96c6\u7fa4<\/p>\n
\u89e3\u51b3\u529e\u6cd5\uff1a\u5728\u8981 CAS \u5220\u9664\u7684 key \u88ab\u5220\u9664\u4ee5\u540e\uff0c\u5728\u4e8b\u52a1\u4e4b\u5916\u5220\u9664\u5173\u8054\u7684 key\uff0c\u8fd9\u4e5f\u8981\u6c42\u6211\u4eec\u80fd\u6b63\u786e\u5224\u65ad\u51fa CAS \u5220\u9664\u662f\u5426\u6210\u529f\uff0c\u4ee3\u7801\u5982\u4e0b<\/p>\n
public void delete(String key, String value, String key2) {\n\n    boolean result = false;\n\n    jedis.watch(key);\n    if (value.equals(jedis.get(key))) {\n        Transaction tx = jedis.multi();\n        tx.del(key);\n        result = tx.exec() != null;\n    } else {\n        jedis.unwatch();\n    }\n\n    if (result) {\n        jedis.del(key2);\n    }\n\n}<\/code><\/pre>\n
\u5982\u679c\u88ab watch \u7684 key \u53d1\u751f\u4e86\u53d8\u5316\uff0c exec \u65f6\u4e8b\u52a1\u4f1a\u653e\u5f03\u6267\u884c\u5e76\u8fd4\u56de null<\/p>\n","protected":false},"excerpt":{"rendered":"
CAS Compare And Swap\uff0c\u5373 CAS\uff0c\u662f\u4e00\u79cd\u4e50\u89c2\u9501\uff0cjava \u7684\u539f\u5b50\u7c7b\u5c31\u662f\u5229\u7528\u7684 CAS \u6765\u5b9e […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[30],"class_list":["post-1163","post","type-post","status-publish","format-standard","hentry","category-java","tag-redis"],"yoast_head":"\nredis \u5b9e\u73b0 CAS \u53ca redis \u4e8b\u52a1\u7684\u5751 - \u62d2\u6d77\u7a7a\u95f4<\/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:\/\/refusea.com\/?p=1163\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"refusea.com\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/refusea.com\/?p=1163#article\",\"isPartOf\":{\"@id\":\"https:\/\/refusea.com\/?p=1163\"},\"author\":{\"name\":\"refusea.com\",\"@id\":\"https:\/\/refusea.com\/#\/schema\/person\/b5393cc8b15717000d19424552aae0df\"},\"headline\":\"redis \u5b9e\u73b0 CAS \u53ca redis \u4e8b\u52a1\u7684\u5751\",\"datePublished\":\"2022-11-16T08:41:58+00:00\",\"dateModified\":\"2022-11-16T08:48:47+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/refusea.com\/?p=1163\"},\"wordCount\":61,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\/\/refusea.com\/#\/schema\/person\/b5393cc8b15717000d19424552aae0df\"},\"keywords\":[\"redis\"],\"articleSection\":[\"Java\"],\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/refusea.com\/?p=1163#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/refusea.com\/?p=1163\",\"url\":\"https:\/\/refusea.com\/?p=1163\",\"name\":\"redis \u5b9e\u73b0 CAS \u53ca redis \u4e8b\u52a1\u7684\u5751 - 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