{"rsdb":{"rid":"241238","subhead":"","postdate":"0","aid":"166122","fid":"76","uid":"1","topic":"1","content":"<div class=\"entry\"> \n <div class=\"copyright-area\">\n  \u539f\u6587\u51fa\u5904\uff1a \n  <a>\u5e76\u53d1\u7f16\u7a0b\u7f51<\/a>\n <\/div> \n <h2>\u8bd1\u5e8f<\/h2> \n <p>Doug Lea \u5927\u795e\u5173\u4e8eJava 7\u5f15\u5165\u7684\u4ed6\u5199\u7684Fork\/Join\u6846\u67b6\u7684\u8bba\u6587\u3002<\/p> \n <p>\u54cd\u5e94\u5f0f\u7f16\u7a0b\uff08Reactive Programming \/ RP\uff09\u4f5c\u4e3a\u4e00\u79cd\u8303\u5f0f\u5728\u6574\u4e2a\u4e1a\u754c\u6b63\u5728\u9010\u6b65\u53d7\u5230\u8ba4\u53ef\u548c\u843d\u5730\uff0c\u662f\u5bf9\u8fc7\u5f80\u7cfb\u7edf\u7684\u4e1a\u52a1\u9700\u6c42\u7406\u89e3\u68b3\u7406\u4e4b\u540e\u5bf9\u7cfb\u7edf\u6280\u672f\u8bbe\u8ba1\/\u67b6\u6784\u6a21\u5f0f\u7684\u63d0\u5347\u603b\u7ed3\u3002Java\u4f5c\u4e3a\u4e00\u4e2a\u6210\u719f\u5e73\u53f0\uff0c\u5bf9\u4e8e\u8d8b\u52bf\u4e00\u5411\u6709\u4e9b\u7a33\u5065\u7684\u63a5\u7eb3\u548c\u8ddf\u8fdb\u80fd\u529b\uff0c\u6709\u7740\u4ee4\u4eba\u60ca\u53f9\u7684\u751f\u547d\u6d3b\u529b\uff1a<\/p> \n <p>Java 7\u63d0\u4f9b\u4e86ForkJoinPool\uff0c\u652f\u6301\u4e86Java 8\u63d0\u4f9b\u7684Stream\uff08Reactive Stream\u662fRP\u7684\u4e00\u4e2a\u6838\u5fc3\u7ec4\u4ef6\uff09\u3002<br \/> \u53e6\u5916Java 8\u8fd8\u63d0\u4f9b\u4e86Lamda\uff08\u6709\u6548\u5730\u8868\u8fbe\u548c\u4f7f\u7528RP\u9700\u8981FP\u7684\u8bed\u8a00\u6784\u4ef6\u548c\u7406\u5ff5\uff09\u3002<br \/> \u6709\u4e86\u524d\u9762\u7684\u8fd9\u4e9b\u7a33\u5065\u4f46\u4e0d\u5931\u65f6\u673a\u7684\u51c6\u5907\uff0c\u5728Java 9\u4e2d\u63d0\u4f9b\u4e86\u9762\u5411RP\u7684Flow API\uff0c\u4e3aJava\u5708\u5b50\u63d0\u4f9b\u4e86\u5b98\u65b9\u7684RP API\uff0c\u6807\u5fd7\u7740RP\u7531\u96c6\u5e02\u5f0f\u7684\u81ea\u7531\u63a2\u7d22\u9636\u6bb5 \u5411 \u6559\u5802\u5f0f\u7684\u7edf\u4e00\u4f7f\u7528\u7684\u8f6c\u53d8\u3002<\/p> \n <p>\u901a\u8fc7\u4e0a\u9762\u8fd9\u4e9b\u8bf4\u660e\uff0c\u53ef\u4ee5\u770b\u5230ForkJoinPool\u7684\u57fa\u7840\u91cd\u8981\u6027\u3002<\/p> \n <p>\u5bf9\u4e86\uff0c\u53e6\u5916\u63d0\u4e00\u4e0bJava 9\u7684Flow API\u7684@author\u4e5f\u662f Doug Lee \u54e6\uff5e<\/p> \n <p>PS\uff1a\u57fa\u4e8eAlex\/\u8427\u6b22 \u7ffb\u8bd1\u3001\u65b9\u817e\u98de \u6821\u5bf9\u7684\u8bd1\u6587\u7a3f\uff1aJava Fork Join \u6846\u67b6\uff0c\u8865\u8bd1\u300e\u7ed3\u8bba\u300f\u4e4b\u540e3\u8282\uff0c\u8c03\u6574\u4e86\u683c\u5f0f\u548c\u4e00\u4e9b\u7528\u8bcd\uff0c\u6574\u7406\u6210\u5b8c\u6574\u7684\u8bd1\u6587\u3002\u8bd1\u6587\u6e90\u7801\u5728GitHub\u7684\u8fd9\u4e2a\u4ed3\u5e93\u4e2d\uff0c\u53ef\u4ee5\u63d0\u4ea4Issue\/Fork\u540e\u63d0\u4ea4\u4ee3\u7801\u6765\u5efa\u8bae\/\u6307\u6b63\u3002<\/p> \n <h2>0. \u6458\u8981<\/h2> \n <p>\u8fd9\u7bc7\u8bba\u6587\u63cf\u8ff0\u4e86Fork\/Join\u6846\u67b6\u7684\u8bbe\u8ba1\u3001\u5b9e\u73b0\u4ee5\u53ca\u6027\u80fd\uff0c\u8fd9\u4e2a\u6846\u67b6\u901a\u8fc7\uff08\u9012\u5f52\u7684\uff09\u628a\u95ee\u9898\u5212\u5206\u4e3a\u5b50\u4efb\u52a1\uff0c\u7136\u540e\u5e76\u884c\u7684\u6267\u884c\u8fd9\u4e9b\u5b50\u4efb\u52a1\uff0c\u7b49\u6240\u6709\u7684\u5b50\u4efb\u52a1\u90fd\u7ed3\u675f\u7684\u65f6\u5019\uff0c\u518d\u5408\u5e76\u6700\u7ec8\u7ed3\u679c\u7684\u8fd9\u79cd\u65b9\u5f0f\u6765\u652f\u6301\u5e76\u884c\u8ba1\u7b97\u7f16\u7a0b\u3002\u603b\u4f53\u7684\u8bbe\u8ba1\u53c2\u8003\u4e86\u4e3aCilk\u8bbe\u8ba1\u7684work-stealing\u6846\u67b6\u3002\u5c31\u8bbe\u8ba1\u5c42\u9762\u6765\u8bf4\u4e3b\u8981\u662f\u56f4\u7ed5\u5982\u4f55\u9ad8\u6548\u7684\u53bb\u6784\u5efa\u548c\u7ba1\u7406\u4efb\u52a1\u961f\u5217\u4ee5\u53ca\u5de5\u4f5c\u7ebf\u7a0b\u6765\u5c55\u5f00\u7684\u3002\u6027\u80fd\u6d4b\u8bd5\u7684\u6570\u636e\u663e\u793a\u826f\u597d\u7684\u5e76\u884c\u8ba1\u7b97\u7a0b\u5e8f\u5c06\u4f1a\u63d0\u5347\u5927\u90e8\u5206\u5e94\u7528\uff0c\u540c\u65f6\u4e5f\u6697\u793a\u4e86\u4e00\u4e9b\u6f5c\u5728\u7684\u53ef\u4ee5\u63d0\u5347\u7684\u7a7a\u95f4\u3002<\/p> \n <p>\u6821\u6ce81\uff1a Cilk\u662f\u82f1\u7279\u5c14Cilk\u8bed\u8a00\u3002\u82f1\u7279\u5c14<a href=https:\/\/www.cppentry.com\/list.php?fid=49 style=text-decoration:underline;font-size:14px;color:#F70968; target=_blank>C++<\/a>\u7f16\u8f91\u5668\u7684\u65b0\u529f\u80fdCilk\u8bed\u8a00\u6269\u5c55\u6280\u672f\uff0c\u4e3aC\/<a href=https:\/\/www.cppentry.com\/list.php?fid=49 style=text-decoration:underline;font-size:14px;color:#F70968; target=_blank>C++<\/a>\u8bed\u8a00\u589e\u52a0\u4e86\u7ec6\u7c92\u5ea6\u4efb\u52a1\u652f\u6301\uff0c\u4f7f\u5176\u4e3a\u65b0\u7684\u548c\u73b0\u6709\u7684\u8f6f\u4ef6\u589e\u52a0\u5e76\u884c\u6027\u6765\u5145\u5206\u53d1\u6398\u591a\u5904\u7406\u5668\u80fd\u529b\u53d8\u5f97\u66f4\u52a0\u5bb9\u6613\u3002<\/p> \n <h2>1. \u7b80\u4ecb<\/h2> \n <p>Fork\/Join\u5e76\u884c\u65b9\u5f0f\u662f\u83b7\u53d6\u826f\u597d\u7684\u5e76\u884c\u8ba1\u7b97\u6027\u80fd\u7684\u4e00\u79cd\u6700\u7b80\u5355\u540c\u65f6\u4e5f\u662f\u6700\u6709\u6548\u7684\u8bbe\u8ba1\u6280\u672f\u3002Fork\/Join\u5e76\u884c\u7b97\u6cd5\u662f\u6211\u4eec\u6240\u719f\u6089\u7684\u5206\u6cbb\u7b97\u6cd5\u7684\u5e76\u884c\u7248\u672c\uff0c\u5178\u578b\u7684\u7528\u6cd5\u5982\u4e0b\uff1a<\/p> \n <pre class=\"brush: java; gutter: true\">Result solve(Problem problem) {\r\n\r\n    if (problem is small) {\r\n\r\n        directly solve problem\r\n\r\n    } else {\r\n\r\n        split problem into independent parts\r\n        fork new subtasks to solve each part\r\n        join all subtasks\r\n        compose result from subresults\r\n    }\r\n}<\/pre> \n <p>fork\u64cd\u4f5c\u5c06\u4f1a\u542f\u52a8\u4e00\u4e2a\u65b0\u7684\u5e76\u884cFork\/Join\u5b50\u4efb\u52a1\u3002join\u64cd\u4f5c\u4f1a\u4e00\u76f4\u7b49\u5f85\u76f4\u5230\u6240\u6709\u7684\u5b50\u4efb\u52a1\u90fd\u7ed3\u675f\u3002Fork\/Join\u7b97\u6cd5\uff0c\u5982\u540c\u5176\u4ed6\u5206\u6cbb\u7b97\u6cd5\u4e00\u6837\uff0c\u603b\u662f\u4f1a\u9012\u5f52\u7684\u3001\u53cd\u590d\u7684\u5212\u5206\u5b50\u4efb\u52a1\uff0c\u76f4\u5230\u8fd9\u4e9b\u5b50\u4efb\u52a1\u53ef\u4ee5\u7528\u8db3\u591f\u7b80\u5355\u7684\u3001\u77ed\u5c0f\u7684\u987a\u5e8f\u65b9\u6cd5\u6765\u6267\u884c\u3002<\/p> \n <p>\u4e00\u4e9b\u76f8\u5173\u7684\u7f16\u7a0b\u6280\u672f\u548c\u5b9e\u4f8b\u5728\u300aJava\u5e76\u53d1\u7f16\u7a0b \u2014\u2014 \u8bbe\u8ba1\u539f\u5219\u4e0e\u6a21\u5f0f \u7b2c\u4e8c\u7248\u300b[7] 4.4\u7ae0\u8282\u4e2d\u5df2\u7ecf\u8ba8\u8bba\u8fc7\u3002\u8fd9\u7bc7\u8bba\u6587\u5c06\u8ba8\u8bbaFJTask\u7684\u8bbe\u8ba1\uff08\u7b2c2\u8282\uff09\u3001\u5b9e\u73b0\uff08\u7b2c3\u8282\uff09\u4ee5\u53ca\u6027\u80fd\uff08\u7b2c4\u8282\uff09\uff0c\u5b83\u662f\u4e00\u4e2a\u652f\u6301\u5e76\u884c\u7f16\u7a0b\u65b9\u5f0f\u7684Java?\u6846\u67b6\u3002FJTask \u4f5c\u4e3autil.concurrent\u8f6f\u4ef6\u5305\u7684\u4e00\u90e8\u5206\uff0c\u76ee\u524d\u53ef\u4ee5\u5728 http:\/\/gee.cs.oswego.edu\/ \u83b7\u53d6\u5230\u3002<\/p> \n <h2>2. \u8bbe\u8ba1<\/h2> \n <p>Fork\/Join\u7a0b\u5e8f\u53ef\u4ee5\u5728\u4efb\u4f55\u652f\u6301\u4ee5\u4e0b\u7279\u6027\u7684\u6846\u67b6\u4e4b\u4e0a\u8fd0\u884c\uff1a\u6846\u67b6\u80fd\u591f\u8ba9\u6784\u5efa\u7684\u5b50\u4efb\u52a1\u5e76\u884c\u6267\u884c\uff0c\u5e76\u4e14\u62e5\u6709\u4e00\u79cd\u7b49\u5f85\u5b50\u4efb\u52a1\u8fd0\u884c\u7ed3\u675f\u7684\u673a\u5236\u3002\u7136\u800c\uff0c<a href=https:\/\/www.cppentry.com style=text-decoration:underline;font-size:14px;color:#F70968; target=_blank>java<\/a>.lang.Thread\u7c7b\uff08\u540c\u65f6\u4e5f\u5305\u62ecPOSIX pthread\uff0c\u8fd9\u4e9b\u4e5f\u662fJava\u7ebf\u7a0b\u6240\u57fa\u4e8e\u7684\u57fa\u7840\uff09\u5bf9Fork\/Join\u7a0b\u5e8f\u6765\u8bf4\u5e76\u4e0d\u662f\u6700\u4f18\u7684\u9009\u62e9\uff1a<\/p> \n <p>Fork\/Join\u4efb\u52a1\u5bf9\u540c\u6b65\u548c\u7ba1\u7406\u6709\u7b80\u5355\u7684\u548c\u5e38\u89c4\u7684\u9700\u6c42\u3002\u76f8\u5bf9\u4e8e\u5e38\u89c4\u7684\u7ebf\u7a0b\u6765\u8bf4\uff0cFork\/Join\u4efb\u52a1\u6240\u5c55\u793a\u7684\u8ba1\u7b97\u5e03\u5c40\u5c06\u4f1a\u5e26\u6765\u66f4\u52a0\u7075\u6d3b\u7684\u8c03\u5ea6\u7b56\u7565\u3002\u4f8b\u5982\uff0cFork\/Join\u4efb\u52a1\u9664\u4e86\u7b49\u5f85\u5b50\u4efb\u52a1\u5916\uff0c\u5176\u4ed6\u60c5\u51b5\u4e0b\u662f\u4e0d\u9700\u8981\u963b\u585e\u7684\u3002\u56e0\u6b64\u4f20\u7edf\u7684\u7528\u4e8e\u8ddf\u8e2a\u8bb0\u5f55\u963b\u585e\u7ebf\u7a0b\u7684\u4ee3\u4ef7\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5b9e\u9645\u4e0a\u662f\u4e00\u79cd\u6d6a\u8d39\u3002<br \/> \u5bf9\u4e8e\u4e00\u4e2a\u5408\u7406\u7684\u57fa\u7840\u4efb\u52a1\u7c92\u5ea6\u6765\u8bf4\uff0c\u6784\u5efa\u548c\u7ba1\u7406\u4e00\u4e2a\u7ebf\u7a0b\u7684\u4ee3\u4ef7\u751a\u81f3\u53ef\u4ee5\u6bd4\u4efb\u52a1\u6267\u884c\u672c\u8eab\u6240\u82b1\u8d39\u7684\u4ee3\u4ef7\u66f4\u5927\u3002\u5c3d\u7ba1\u7c92\u5ea6\u662f\u5e94\u8be5\u968f\u7740\u5e94\u7528\u7a0b\u5e8f\u5728\u4e0d\u540c\u7279\u5b9a\u5e73\u53f0\u4e0a\u8fd0\u884c\u800c\u505a\u51fa\u76f8\u5e94\u8c03\u6574\u7684\u3002\u4f46\u662f\u8d85\u8fc7\u7ebf\u7a0b\u5f00\u9500\u7684\u6781\u7aef\u7c97\u7c92\u5ea6\u4f1a\u9650\u5236\u5e76\u884c\u7684\u53d1\u6325\u3002<br \/> \u7b80\u800c\u8a00\u4e4b\uff0cJava\u6807\u51c6\u7684\u7ebf\u7a0b\u6846\u67b6\u5bf9Fork\/Join\u7a0b\u5e8f\u800c\u8a00\u592a\u7b28\u91cd\u4e86\u3002\u4f46\u662f\u65e2\u7136\u7ebf\u7a0b\u6784\u6210\u4e86\u5f88\u591a\u5176\u4ed6\u7684\u5e76\u53d1\u548c\u5e76\u884c\u7f16\u7a0b\u7684\u57fa\u7840\uff0c\u5b8c\u5168\u6d88\u9664\u8fd9\u79cd\u4ee3\u4ef7\u6216\u8005\u4e3a\u4e86\u8fd9\u79cd\u65b9\u5f0f\u800c\u8c03\u6574\u7ebf\u7a0b\u8c03\u5ea6\u662f\u4e0d\u53ef\u80fd\uff08\u6216\u8005\u8bf4\u4e0d\u5207\u5b9e\u9645\u7684\uff09\u3002<\/p> \n <p>\u5c3d\u7ba1\u8fd9\u79cd\u601d\u60f3\u5df2\u7ecf\u5b58\u5728\u4e86\u5f88\u957f\u65f6\u95f4\u4e86\uff0c\u4f46\u662f\u7b2c\u4e00\u4e2a\u53d1\u5e03\u7684\u80fd\u7cfb\u7edf\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u7684\u6846\u67b6\u662fCilk[5]\u3002Cilk\u548c\u5176\u4ed6\u8f7b\u91cf\u7ea7\u7684\u6846\u67b6\u662f\u57fa\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u7684\u57fa\u672c\u7684\u7ebf\u7a0b\u548c\u8fdb\u7a0b\u673a\u5236\u6765\u652f\u6301\u7279\u6b8a\u7528\u9014\u7684Fork\/Join\u7a0b\u5e8f\u3002\u8fd9\u79cd\u7b56\u7565\u540c\u6837\u9002\u7528\u4e8eJava\uff0c\u5c3d\u7ba1Java\u7ebf\u7a0b\u662f\u57fa\u4e8e\u4f4e\u7ea7\u522b\u7684\u64cd\u4f5c\u7cfb\u7edf\u7684\u80fd\u529b\u6765\u5b9e\u73b0\u7684\u3002\u521b\u9020\u8fd9\u6837\u4e00\u4e2a\u8f7b\u91cf\u7ea7\u7684\u6267\u884c\u6846\u67b6\u7684\u4e3b\u8981\u4f18\u52bf\u662f\u80fd\u591f\u8ba9Fork\/Join\u7a0b\u5e8f\u4ee5\u4e00\u79cd\u66f4\u76f4\u89c2\u7684\u65b9\u5f0f\u7f16\u5199\uff0c\u8fdb\u800c\u80fd\u591f\u5728\u5404\u79cd\u652f\u6301JVM\u7684\u7cfb\u7edf\u4e0a\u8fd0\u884c\u3002<\/p> 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