{"id":10007986,"date":"2023-06-25T17:59:36","date_gmt":"2023-06-25T09:59:36","guid":{"rendered":"https:\/\/ityet.com\/?p=10007986"},"modified":"2023-06-25T17:59:36","modified_gmt":"2023-06-25T09:59:36","slug":"jdk-21-%e4%b8%ad%e7%9a%84%e7%bb%93%e6%9e%84%e5%8c%96%e5%b0%86%e5%b8%a6%e6%9d%a5%e5%8f%91%e7%bc%96%e7%a8%8b%e7%9a%84%e4%b8%80%e6%ac%a1%e9%a3%9e%e8%b7%83","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10007986","title":{"rendered":"JDK 21 \u4e2d\u7684\u7ed3\u6784\u5316\u5c06\u5e26\u6765\u53d1\u7f16\u7a0b\u7684\u4e00\u6b21\u98de\u8dc3"},"content":{"rendered":"

\u6700\u8fd1\uff0cJEP 453\uff0c\u7ed3\u6784\u5316\u5e76\u53d1\uff08\u9884\u89c8\uff09<\/a>\u5df2\u7ecf\u4ece JDK 21 \u7684 Targeted \u72b6\u6001\u53d8\u66f4\u4e3a Integrated \u72b6\u6001\u3002\u8fd9\u4e2a\u6700\u521d\u7684\u9884\u89c8\u7279\u6027\u6765\u6e90\u4e8e\u4e00\u4e2a\u5b75\u5316 API\uff0c\u5b83\u6839\u636e\u524d\u4e24\u8f6e\u7684\u5b75\u5316\u7eb3\u5165\u4e86\u4e00\u4e9b\u6539\u8fdb\uff0c\u8fd9\u4e24\u8f6e\u5b75\u5316\u5206\u522b\u662f JDK 19 \u4ea4\u4ed8\u7684JEP 428\uff0c\u7ed3\u6784\u5316\u5e76\u53d1\uff08\u5b75\u5316\uff09<\/a>\u548c JDK 20 \u4ea4\u4ed8\u7684JEP 437<\/a>\uff0c\u7ed3\u6784\u5316\u5e76\u53d1\uff08\u7b2c\u4e8c\u8f6e\u5b75\u5316\uff09\u3002\u5728\u5f53\u524d\u63d0\u6848\u4e2d\uff0c\u552f\u4e00\u7684\u663e\u8457\u53d8\u5316\u662fStructuredTaskScope::fork(…)\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a[Subtask<\/a>]\uff0c\u800c\u4e0d\u662fFuture<\/a>\u3002<\/p>\n

JDK 21 \u4e2d\u7684\u7ed3\u6784\u5316\u5e76\u53d1\u81f4\u529b\u4e8e\u5f15\u5165\u7ed3\u6784\u5316\u5e76\u53d1\u7684 API \u6765\u7b80\u5316\u5e76\u53d1\u7f16\u7a0b\u3002\u8fd9\u79cd\u65b9\u6cd5\u5c06\u5728\u4e0d\u540c\u7ebf\u7a0b\u4e2d\u8fd0\u884c\u7684\u76f8\u5173\u4efb\u52a1\u7ec4\u89c6\u4e3a\u4e00\u4e2a\u5de5\u4f5c\u5355\u5143\uff0c\u4ece\u800c\u7b80\u5316\u4e86\u9519\u8bef\u5904\u7406\u548c\u53d6\u6d88\uff0c\u63d0\u9ad8\u4e86\u53ef\u9760\u6027\uff0c\u5e76\u589e\u5f3a\u4e86\u53ef\u89c2\u6d4b\u6027\u3002\u6211\u4eec\u770b\u4e00\u4e2a\u6837\u4f8b\uff1a<\/p>\n

Response handle() throws ExecutionException, InterruptedException {\n     try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {\n          Supplier<String>  user  = scope.fork(() ->  findUser());\n          Supplier<Integer> order = scope.fork(() ->  fetchOrder());\n          scope.join()            \/\/ Join both subtasks\n                .throwIfFailed();  \/\/ ... and propagate errors\n          \/\/ Here, both subtasks have succeeded, so compose their results\n          return new Response(user.get(), order.get());\n    }\n    \/\/...\n}<\/code><\/pre>\n
\u8fd9\u6bb5\u4ee3\u7801\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684StructuredTaskScope<\/a>\uff0c\u5e76\u4f7f\u7528\u5b83\u6765\u521b\u5efa\u4e86\u4e24\u4e2a\u5206\u652f\u5b50\u4efb\u52a1\uff0c\u5176\u4e2d\u4e00\u4e2a\u6267\u884cfindUser()\uff0c\u53e6\u4e00\u4e2a\u6267\u884cfetchOrder()\u3002\u5f53\u8fd9\u4e24\u4e2a\u5b50\u4efb\u52a1\u5747\u5b8c\u6210\u65f6\uff0c\u5b83\u4f1a\u4f7f\u7528\u8fd9\u4e24\u4e2a\u5b50\u4efb\u52a1\u7684\u7ed3\u679c\u521b\u5efa\u4e00\u4e2a\u65b0\u7684Response\u3002<\/p>\n
\u7ed3\u6784\u5316\u5e76\u53d1\u662f\u4e00\u4e2a\u9884\u89c8 API\uff0c\u9ed8\u8ba4\u662f\u7981\u7528\u7684\u3002\u8981\u4f7f\u7528StructuredTaskScope API\uff0c\u5f00\u53d1\u4eba\u5458\u5fc5\u987b\u542f\u7528\u9884\u89c8 API \u6765\u7f16\u8bd1\u8be5\u4ee3\u7801\uff0c\u5982\u4e0b\u9762\u7684\u547d\u4ee4\u6240\u793a\uff1a<\/p>\n
javac --release 21 --enable-preview Main.java<\/code><\/pre>\n
\u8fd0\u884c\u8be5\u7a0b\u5e8f\u4e5f\u9700\u8981\u76f8\u540c\u7684\u6807\u8bb0\uff0c\u5982\u4e0b\uff1a<\/p>\n
java --enable-preview Main<\/code><\/pre>\n
\u4f46\u662f\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u6e90\u7801\u542f\u52a8\u5668\uff08source code launcher\uff09<\/a>\u6765\u76f4\u63a5\u8fd0\u884c\u5b83\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u547d\u4ee4\u884c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
java --source 21 --enable-preview Main.java<\/code><\/pre>\n
\u4e0d\u8fc7\uff0c\u4f7f\u7528jshell<\/a>\u65b9\u6848\u4e5f\u662f\u53ef\u4ee5\u7684\uff0c\u4e0d\u8fc7\u4f9d\u7136\u9700\u8981\u542f\u7528\u9884\u89c8\u7279\u6027\uff0c\u547d\u4ee4\u5982\u4e0b\uff1a<\/p>\n
 jshell --enable-preview<\/code><\/pre>\n
\u5728\u5b9e\u8df5\u4e2d\uff0c\u4f7f\u7528StructuredTaskScope\u65f6\uff0c\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u90fd\u4e0d\u4f1a\u76f4\u63a5\u4f7f\u7528StructuredTaskScope\u7c7b\uff0c\u800c\u662f\u4f7f\u7528\u4e24\u4e2a\u5b50\u7c7b\u4e2d\u7684\u67d0\u4e00\u4e2a\uff0c\u8fd9\u4e24\u4e2a\u5b50\u7c7b\u5747\u5b9e\u73b0\u4e86\u5173\u95ed\u7b56\u7565\u3002\u8fd9\u4e24\u4e2a\u5b50\u7c7b\uff0c\u5373ShutdownOnFailure\u548cShutdownOnSuccess\uff0c\u5206\u522b\u652f\u6301\u5728\u7b2c\u4e00\u4e2a\u5b50\u4efb\u52a1\u5931\u8d25\u6216\u6210\u529f\u65f6\u5173\u95ed\u4f5c\u7528\u57df\u7684\u6a21\u5f0f\u3002<\/p>\n
\u7ed3\u6784\u5316\u5e76\u53d1\u5c06\u5728\u4e0d\u540c\u7ebf\u7a0b\u4e2d\u8fd0\u884c\u7684\u76f8\u5173\u4efb\u52a1\u89c6\u4e3a\u4e00\u4e2a\u5de5\u4f5c\u5355\u5143\u3002\u8fd9\u79cd\u65b9\u5f0f\u7b80\u5316\u4e86\u9519\u8bef\u5904\u7406\u548c\u53d6\u6d88\uff0c\u63d0\u9ad8\u4e86\u53ef\u9760\u6027\uff0c\u5e76\u589e\u5f3a\u4e86\u53ef\u89c2\u6d4b\u6027\u3002\u5f00\u53d1\u8005Ron Pressler<\/a>\u662f\u7532\u9aa8\u6587\u516c\u53f8\u6280\u672f\u5458\u5de5\u7684\u54a8\u8be2\u6210\u5458\uff0c\u5e76\u4e14\u662f OpenJDK \u7684Loom\u9879\u76ee\u7684\u6280\u672f\u8d1f\u8d23\u4eba\uff0cAlan Bateman<\/a>\u662f\u7532\u9aa8\u6587\u516c\u53f8 Java \u5e73\u53f0\u7ec4\u7684\u5de5\u7a0b\u5e08\uff0c\u4ed6\u4eec\u610f\u56fe\u6d88\u9664\u4e0e\u5e76\u53d1\u7f16\u7a0b\u76f8\u5173\u7684\u5e38\u89c1\u98ce\u9669\uff0c\u5982\u7ebf\u7a0b\u6cc4\u9732\u548c\u53d6\u6d88\u5ef6\u8fdf\uff0c\u5e76\u589e\u5f3a\u5e76\u53d1\u4ee3\u7801\u7684\u53ef\u89c2\u6d4b\u6027\u3002<\/p>\n
\u8fd9\u4e2a\u65b0\u7279\u6027\u7684\u76ee\u7684\u5e76\u4e0d\u662f\u8981\u53d6\u4ee3java.util.concurrent<\/a>\u5305\u4e2d\u7684\u4efb\u4f55\u5e76\u53d1\u7ed3\u6784\uff0c\u5982ExecutorService\u548cFuture\u3002\u5b83\u7684\u76ee\u7684\u4e5f\u4e0d\u662f\u4e3a Java \u5e73\u53f0\u5b9a\u4e49\u660e\u786e\u7684\u7ed3\u6784\u5316\u5e76\u53d1 API\uff0c\u6216\u5728\u7ebf\u7a0b\u95f4\u5171\u4eab\u6570\u636e\u6d41\u7684\u65b9\u6cd5\u3002\u5f53\u524d\u7684\u5e76\u53d1\u7f16\u7a0b\u6a21\u578b\uff0c\u5982ExecutorService API\uff0c\u7531\u4e8e\u5176\u4e0d\u53d7\u9650\u5236\u7684\u5e76\u53d1\u6a21\u5f0f\uff0c\u5f15\u5165\u4e86\u590d\u6742\u6027\u548c\u98ce\u9669\u3002\u8fd9\u4e9b\u6a21\u578b\u4e0d\u4f1a\u5f3a\u5236\u8981\u6c42\u6216\u8ddf\u8e2a\u4efb\u52a1\u548c\u5b50\u4efb\u52a1\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u4f7f\u5f97\u5e76\u53d1\u4efb\u52a1\u7684\u7ba1\u7406\u548c\u53ef\u89c2\u6d4b\u6027\u5f88\u5177\u6311\u6218\u6027\u3002<\/p>\n
\u7ed3\u6784\u5316\u5e76\u53d1\u63d0\u51fa\uff0c\u4efb\u52a1\u7ed3\u6784\u5e94\u8be5\u53cd\u6620\u4ee3\u7801\u7ed3\u6784\u3002\u5728\u5355\u7ebf\u7a0b\u4ee3\u7801\u4e2d\uff0c\u6267\u884c\u8fc7\u7a0b\u603b\u662f\u4f1a\u5f3a\u5236\u4fdd\u8bc1\u4efb\u52a1\u548c\u5b50\u4efb\u52a1\u7684\u5c42\u6b21\u7ed3\u6784\uff0c\u6bcf\u4e2a\u5b50\u4efb\u52a1\u76f8\u5bf9\u4e8e\u5176\u4ed6\u5b50\u4efb\u52a1\u7684\u751f\u547d\u5468\u671f\u662f\u7531\u4ee3\u7801\u7684\u8bed\u6cd5\u5757\u7ed3\u6784\u6765\u7ba1\u7406\u7684\u3002<\/p>\n
\u65b0\u7684StructuredTaskScope\u4e3aExecutorService\u63d0\u4f9b\u4e86\u4e00\u4e2a\u66f4\u7b80\u5355\u3001\u66f4\u5b89\u5168\u5730\u66ff\u4ee3\u65b9\u6848\u3002\u8fd9\u4e2a API \u5c01\u88c5\u4e86\u4e00\u7ec4\u5e94\u8be5\u4e00\u8d77\u5b8c\u6210\u7684\u76f8\u5173\u4efb\u52a1\uff0c\u4efb\u4f55\u5b50\u4efb\u52a1\u7684\u5931\u8d25\u90fd\u4f1a\u5bfc\u81f4\u5176\u4f59\u5b50\u4efb\u52a1\u7684\u53d6\u6d88\u3002<\/p>\n
\u6709\u5173\u8fd9\u4e9b\u53d8\u66f4\u7684\u66f4\u591a\u7ec6\u8282\uff0c\u5305\u62ec\u4ee3\u7801\u793a\u4f8b\u548c\u5bf9\u8be5\u529f\u80fd\u80cc\u540e\u52a8\u673a\u7684\u5168\u9762\u8ba8\u8bba\uff0c\u8bf7\u53c2\u9605OpenJDK<\/a>\u7684\u7f51\u7ad9\u3002\u8fd9\u4e2a\u65b0\u7684 API \u662f\u4f7f\u5e76\u53d1\u7f16\u7a0b\u66f4\u5bb9\u6613\u3001\u66f4\u53ef\u9760\u548c\u66f4\u5177\u53ef\u89c2\u6d4b\u6027\u7684\u91cd\u8981\u4e00\u6b65\u3002\u9884\u8ba1\u5b83\u5bf9\u6784\u5efa\u53ef\u7ef4\u62a4\u7684\u3001\u53ef\u9760\u7684\u548c\u53ef\u89c2\u6d4b\u7684\u670d\u52a1\u5668\u5e94\u7528\u5c24\u4e3a\u6709\u5229\u3002<\/p>\n
\u539f\u6587\u94fe\u63a5\uff1ahttps:\/\/www.infoq.com\/news\/2023\/06\/structured-concurrency-jdk…<\/a><\/p>\n
https:\/\/segmentfault.com\/a\/1190000043933358<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u6700\u8fd1\uff0cJEP 453\uff0c\u7ed3\u6784\u5316\u5e76\u53d1\uff08\u9884\u89c8\uff09\u5df2\u7ecf\u4ece JDK 21 \u7684 Targeted \u72b6\u6001\u53d8\u66f4\u4e3a Integra […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10007986","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10007986","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10007986"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10007986\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10007986"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10007986"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10007986"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}