{"id":1122,"date":"2014-12-25T22:10:51","date_gmt":"2014-12-25T14:10:51","guid":{"rendered":"http:\/\/coderbee.net\/?p=1122"},"modified":"2014-12-27T21:26:22","modified_gmt":"2014-12-27T13:26:22","slug":"java-%e4%bb%bb%e5%8a%a1%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/java\/20141225\/1122","title":{"rendered":"Java \u4efb\u52a1\u5904\u7406"},"content":{"rendered":"

\u6700\u8fd1\u68b3\u7406\u5176\u4ed6\u540c\u4e8b\u4ee5\u524d\u5199\u7684 job \u540e\u6709\u70b9\u60f3\u6cd5\uff0c\u8bb0\u5f55\u4e0b\u3002<\/p>\n

\u4e00\u3001\u4e1a\u52a1\u573a\u666f<\/h3>\n

\u5728\u5927\u591a\u6570\u7684\u7cfb\u7edf\u90fd\u6709\u7c7b\u4f3c\u8fd9\u6837\u7684\u903b\u8f91\uff0c\u6bd4\u5982\u4e0b\u5355\u4e86\u7ed9\u7528\u6237\u8d60\u9001\u79ef\u5206\uff0c\u7528\u6237\u5728\u8bba\u575b\u4e0a\u53d1\u8868\u4e86\u5e16\u5b50\uff0c\u7ed9\u7528\u6237\u589e\u52a0\u79ef\u5206\u7b49\u7b49\u3002<\/p>\n

\u4e0b\u5355\u8d60\u9001\u79ef\u5206\uff0c\u90a3\u4e48\u4e00\u4e2a\u8ba2\u5355\u80af\u5b9a\u4e0d\u80fd\u91cd\u590d\u8d60\u9001\u79ef\u5206\uff0c\u6240\u4ee5\u9700\u8981\u4e00\u4e9b\u72b6\u6001\u6765\u6bd4\u8f83\u6765\u54ea\u4e9b\u662f\u5df2\u8d60\u9001\u7684\uff0c\u54ea\u4e9b\u662f\u6ca1\u6709\u8d60\u9001\u7684\u3002\u6216\u8bb8\u53ef\u4ee5\u5728\u8ba2\u5355\u8868\u91cc\u52a0\u4e2a\u5b57\u6bb5\u6765\u6807\u8bb0\u662f\u5426\u8d60\u9001\u4e86\u79ef\u5206\u3002<\/p>\n

\u6709\u65f6\u5019\uff0c\u4e1a\u52a1\u4eba\u5458\u51fa\u4e8e\u8425\u9500\u7684\u9700\u8981\uff0c\u53ef\u80fd\u8981\u641e\u4e2a\u67d0\u67d0\u65f6\u95f4\u6bb5\u5185\u4e0b\u5355\u8fd4\u5238\u7684\u6d3b\u52a8\u3002\u96be\u9053\u53c8\u5728\u8ba2\u5355\u8868\u91cc\u52a0\u4e2a\u5b57\u6bb5\uff1f\u80af\u5b9a\u4e0d\u80fd\uff0c\u8c01\u77e5\u9053\u8fd8\u8981\u641e\u591a\u5c11\u6d3b\u52a8\u5462\u3002<\/p>\n

\u4e8c\u3001\u5b9e\u73b0<\/h3>\n

\u4e3a\u4e86\u4f7f\u6838\u5fc3\u7684\u4e1a\u52a1\u6d41\u7a0b\u5c3d\u53ef\u80fd\u7b80\u5355\u9ad8\u6548\uff0c\u8d60\u9001\u79ef\u5206\u3001\u8fd4\u5238\uff08\u540e\u9762\u7b80\u79f0\u4e3atask\uff09\u4e4b\u7c7b\u7684\u903b\u8f91\u5e94\u8be5\u901a\u8fc7\u5f02\u6b65\u7684job\u6765\u5904\u7406\u3002<\/p>\n

\u56e0\u4e3a task \u7684\u5904\u7406\u72b6\u6001\u4e0d\u80fd\u653e\u5728\u6838\u5fc3\u7684\u4e1a\u52a1\u8868\u91cc\uff0c\u6240\u4ee5\uff0c\u53ef\u4ee5\u53e6\u5916\u5efa\u4e00\u4e2a\u8868\u793a\u5f02\u6b65\u4efb\u52a1\u7684 async_task \u8868\uff0c\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n

-- \u4e1a\u52a1job\u5904\u7406 \u4efb\u52a1\ncreate table async_task (\n  id number(11) primary key,\n  key_work  varchar2(32),  --  \u4e0d\u540c\u4e1a\u52a1\u903b\u8f91\u7684task\u7528\u4e0d\u540c\u7684keyword\n  biz_id char(32),         --  \u4e1a\u52a1\u6570\u636e ID\uff0c\u6bd4\u5982\u8ba2\u5355\u53f7\n  biz_data varchar2(256),  --  \u6838\u5fc3\u7684\u4e1a\u52a1\u6570\u636e\uff0c\u7528\u4e8e\u907f\u514d\u5173\u8054\u4e1a\u52a1\u8868\uff1b\u5177\u4f53\u7ed3\u6784\u53d6\u51b3\u4e8ekeyword\n  status number,           --  \u4efb\u52a1\u7684\u5904\u7406\u72b6\u6001\uff1b -2:\u672a\u5904\u7406, -1:\u5904\u7406\u4e2d, 0:\u5df2\u5904\u7406, \u5927\u4e8e 0 \u7684\u6570\u5b57\u8868\u793a\u5931\u8d25\u6b21\u6570\n  create_tm date,          --  \u4efb\u52a1\u7684\u521b\u5efa\u65f6\u95f4\n  modify_tm date           --  \u4efb\u52a1\u7684\u4fee\u6539\u65f6\u95f4\n);\n<\/code><\/pre>\n
\u5904\u4e8e\u6027\u80fd\u8003\u8651\uff0c\u53ef\u4ee5\u5728 key_work \u5b57\u6bb5\u4e0a\u5efa\u7acb\u5206\u533a\uff0c\u5728 biz_id \u4e0a\u5efa\u7acb\u7d22\u5f15\u3002<\/p>\n
\u5f53\u4e1a\u52a1\u8868\u6709\u9700\u8981\u5904\u7406\u7684\u6570\u636e\u65f6\uff0c\u5c31\u5f80 async_task \u63d2\u5165\u4e00\u6761\u76f8\u5e94\u7684\u8bb0\u5f55\uff08\u53ef\u4ee5\u5f02\u6b65\u63d2\u5165\uff09\uff0c\u5f02\u6b65 job \u518d\u4ece async_task \u8868\u91cc\u53d6\u6570\u636e\u6765\u5904\u7406\u3002<\/p>\n
\u6ce8\u610f\uff1a<\/strong>\u5904\u7406 task \u65f6\uff0c\u8981\u4fdd\u8bc1\u6570\u636e\u7684\u4e00\u81f4\u6027\u3002\u6240\u5728\u7684\u9879\u76ee\u7ec4\u66fe\u51fa\u73b0\u8fc7\uff0c\u4e0b\u5355\u8fd4\u5238\u7684\u6d3b\u52a8\u91cc\uff0c\u9001\u5238\u4e0e\u66f4\u65b0\u72b6\u6001\u7684\u64cd\u4f5c\u6ca1\u6709\u653e\u5728\u540c\u4e00\u4e2a\u4e8b\u52a1\u91cc\uff0c\u51fa\u73b0\u5238\u9001\u4e86\uff0c\u72b6\u6001\u6ca1\u66f4\u65b0\uff0c\u91cd\u590d\u9001\u5238\u7684\u95ee\u9898\u3002\u4e00\u5b9a\u8981\u6ce8\u610f\u4e8b\u52a1\u7684\u6b63\u786e\u5904\u7406\u3002<\/strong><\/p>\n
<\/p>\n
\u4e09\u3001\u5355\u7ebf\u7a0b\u3001\u591a\u7ebf\u7a0b\u5904\u7406 task<\/h3>\n
\u4e0d\u7ba1\u662f\u7528\u5355\u7ebf\u7a0b\u8fd8\u662f\u591a\u7ebf\u7a0b\uff0c\u90fd\u8981\u8003\u8651\u6709\u5927\u91cf task \u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u4e0d\u80fd\u4e00\u6b21\u628a\u6240\u6709\u7b26\u5408\u6761\u4ef6\u7684 task \u90fd\u8bfb\u53d6\u5230\u5185\u5b58\u91cc\uff0c\u4e00\u5b9a\u8981\u5206\u9875\u3002<\/p>\n
\u5355\u673a\u5355\u7ebf\u7a0b<\/h4>\n
\u4e0d\u7528\u8003\u8651\u6570\u636e\u88ab\u5176\u4ed6\u7ebf\u7a0b\u91cd\u590d\u5904\u7406\u7684\u60c5\u51b5\uff0c\u987a\u5e8f\u5904\u7406\u5373\u53ef\uff1a\u53d6\u4e00\u6279\u6570\u636e\u5904\u7406\uff0c\u5904\u7406\u5b8c\u4e86\u518d\u53d6\u4e0b\u4e00\u6279\uff0c\u76f4\u5230\u6240\u6709\u7684\u90fd\u5904\u7406\u5b8c\u4e86\u3002<\/p>\n
\u5355\u673a\u591a\u7ebf\u7a0b<\/h4>\n
\u6570\u636e\u91cf\u5927\u4e86\uff0c\u5c31\u4e0d\u80fd\u7528\u5355\u7ebf\u7a0b\u6162\u6162\u5730\u5904\u7406\u4e86\u3002\u53ef\u4ee5\u91c7\u7528\u4e00\u4e2a\u7ebf\u7a0b\u53bb\u8bfb\u53d6\u672a\u5904\u7406\u7684 task\uff0c\u7136\u540e\u63d0\u4ea4\u5230\u7ebf\u7a0b\u6c60\u53bb\u5904\u7406\uff0c\u7b49\u8fd9\u6279 task \u5904\u7406\u5b8c\u540e\u518d\u53bb\u8bfb\u53d6\u4e0b\u4e00\u6279\uff0c\u4e3b\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n

\/\/ \u76f4\u63a5\u4f7f\u7528 ThreadPoolExecutor \u662f\u4e3a\u4e86\u4f7f\u7ebf\u7a0b\u6c60\u7684\u7ebf\u7a0b\u6709\u7279\u5b9a\u7684\u540d\u5b57\uff0c\u4efb\u52a1\u961f\u5217\u6709\u8fb9\u754c\u3002\nExecutorService executorService = new ThreadPoolExecutor(0, 10, 5,\n        TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(1000),  \/\/ \u6709\u754c\u961f\u5217\n        new ThreadFactory() {                                      \/\/ \u4f7f\u7528\u5b9a\u5236\u7684\n            private AtomicInteger counter = new AtomicInteger(0);\n\n            @Override\n            public Thread newThread(Runnable r) {\n                Thread thread = new Thread(r);\n                thread.setName(\"task-handler-\"\n                        + counter.incrementAndGet());\n                return null;\n            }\n\n        }, new CallerRunsPolicy());\n\ndo {\n    List<AsyncTask> tasks = getUnhandleTask();\n    if (tasks.isEmpty()) {\n        break;\n    }\n    List<Callable<Object>> callables = convert2callables(tasks);\n\n    executorService.invokeAll(callables);\n\n} while (true);\n\nexecutorService.shutdown();\n<\/code><\/pre>\n
\u7ebf\u7a0b\u6c60\u91c7\u7528 CallerRunsPolicy \u7b56\u7565\u662f\u4e3a\u4e86\u5728\u7ebf\u7a0b\u6c60\u5904\u7406\u4e0d\u5b8c\u4efb\u52a1\uff0c\u7ebf\u7a0b\u6c60\u7684\u4efb\u52a1\u961f\u5217\u6ee1\u7684\u65f6\u5019\uff0c\u8bfb\u53d6 task \u7684\u7ebf\u7a0b\u53ef\u4ee5\u76f4\u63a5\u5904\u7406 task\uff0c\u8fd9\u6837\u65e2\u51cf\u7f13\u4e86 task \u7684\u8bfb\u53d6\u901f\u5ea6\uff0c\u53c8\u53ef\u4ee5\u52a0\u5feb task \u7684\u5904\u7406\u901f\u5ea6\u3002<\/p>\n
\u591a\u673a\u5904\u7406<\/h4>\n
\u6570\u636e\u91cf\u5b9e\u5728\u592a\u591a\uff0c\u4e00\u53f0\u673a\u5668\u5904\u7406\u4e0d\u5b8c\uff0c\u53ef\u4ee5\u7528\u591a\u53f0\u3002<\/p>\n
\u5728\u591a\u673a\u5904\u7406\u7684\u65f6\u5019\uff0c\u4e0a\u9762\u7684\u4ee3\u7801\u5c31\u6709\u95ee\u9898\u4e86\uff0ctask \u53ef\u80fd\u5728\u4e0d\u540c\u7684\u673a\u5668\u4e0a\u88ab\u91cd\u590d\u5904\u7406\u3002<\/p>\n
\u4efb\u52a1\u88ab getUnhandleTask()<\/code> \u65b9\u6cd5\u8bfb\u53d6\u5904\u7406\u540e\u3001\u5904\u7406\u5b8c\u6210\u524d\uff0c\u53e6\u4e00\u53f0\u673a\u5668\u4e0a\u7684\u7ebf\u7a0b\u4e5f\u8bfb\u53d6\u5230\u4e86\u8fd9\u4e2a\u4efb\u52a1\uff0c\u53d1\u73b0\u662f\u672a\u5904\u7406\u7684\uff0c\u5b83\u4e5f\u4f1a\u8fdb\u884c\u5904\u7406\uff0c\u8fd9\u6837\u5c31\u51fa\u73b0\u91cd\u590d\u5904\u7406\u4e86\u3002\u6b63\u786e\u7684\u4e3b\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n
  public class AsyncTask {\n    private long id;\n    private int status;\n\n    public static enum STATUS {\n        UNHANDLE, HANDLING\n    }\n\n    public long getId() {\n        return id;\n    }\n\n    public void setId(long id) {\n        this.id = id;\n    }\n\n    public int getStatus() {\n        return status;\n    }\n\n    public void setStatus(int status) {\n        this.status = status;\n    }\n}\n\npublic class TestTaskHandle {\n\n    private Callable<Object> convert(final AsyncTask task) {\n        return new Callable<Object>() {\n\n            @Override\n            public Object call() throws Exception {\n                return doWithTask(task);\n            }\n        };\n    }\n\n    private Object doWithTask(AsyncTask task) {\n        return null;\n    }\n\n    private List<AsyncTask> getUnhandleTask() {\n        return null;\n    }\n\n    public void multiMachine() {\n\n        ExecutorService executorService = new ThreadPoolExecutor(0, 10, 5,\n                TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(1000),\n                new ThreadFactory() {\n                    private AtomicInteger counter = new AtomicInteger(0);\n\n                    @Override\n                    public Thread newThread(Runnable r) {\n                        Thread thread = new Thread(r);\n                        thread.setName(\"task-handler-\"\n                                + counter.incrementAndGet());\n                        return null;\n                    }\n\n                }, new CallerRunsPolicy());\n\n        do {\n            List<AsyncTask> tasks = getUnhandleTask();\n            if (tasks.isEmpty()) {\n                break;\n            }\n\n            for (AsyncTask asyncTask : tasks) {\n                \/\/ \u628a RDBMS \u7684 update \u64cd\u4f5c\u5f53\u4f5c\u4e00\u4e2a CAS \u547d\u4ee4\n                boolean isSuccess = updateStatus(asyncTask.getId(),\n                        AsyncTask.STATUS.UNHANDLE, AsyncTask.STATUS.HANDLING);\n                if (isSuccess) {\n                    \/\/ \u628a task \u66f4\u65b0\u4e3a\u5904\u7406\u4e2d\uff0c\u6210\u529f\u8868\u793a\u62a2\u5360\u5230\u4e86\u8fd9\u4e2a\u4efb\u52a1\uff0c\u53ef\u4ee5\u7ee7\u7eed\u5904\u7406\n\n                    executorService.submit(convert(asyncTask));\n\n                } \/\/ else \u88ab\u5176\u4ed6\u7ebf\u7a0b\u5904\u7406\u4e86\n            }\n\n        } while (true);\n\n        executorService.shutdown();\n    }\n\n    public boolean updateStatus(long id, AsyncTask.STATUS oldStatus,\n            AsyncTask.STATUS newStatus) {\n        return true;\n    }\n} \n<\/code><\/pre>\n
\u5728\u4e0a\u9762\u7684\u5b9e\u73b0\u4e2d\uff0c\u6bcf\u4e00\u6761\u8bb0\u5f55\u90fd\u9700\u8981\u901a\u8fc7\u4e00\u4e2a\u6570\u636e\u5e93\u7684 update \u64cd\u4f5c\u6765\u5224\u65ad\u662f\u5426\u53ef\u4ee5\u7ee7\u7eed\u5904\u7406\uff0c\u5f00\u9500\u4e0d\u5c0f\u3002\u4e00\u4e2a\u6539\u8fdb\u7684\u505a\u6cd5\u662f\uff1a\u5728 async_task \u8868\u589e\u52a0\u4e00\u4e2a owner \u5b57\u6bb5\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u4f7f\u7528\u4e00\u4e2a\u552f\u4e00\u7684\u6807\u8bc6 tid\uff08\u6bd4\u5982 UUID\uff09\u3002\u5f53 task \u8bfb\u53d6\u7ebf\u7a0b\u8981\u8bfb\u53d6\u4efb\u52a1\u65f6\uff0c\u5148\u5bf9  async_task \u8868\u91cc\u7684\u672a\u5904\u7406 task \u6267\u884c update\uff0c\u628a\u72b6\u6001\u66f4\u65b0\u4e3a\u5904\u7406\u4e2d\uff0c owner \u66f4\u65b0\u4e3a\u81ea\u5df1\u7684 tid\u3002\u5982\u679c\u8fd9\u4e2a update \u7684\u5f71\u54cd\u884c\u6570\u5927\u4e8e 0\uff0c\u8868\u793a\u62a2\u5360\u5230\u4e86\u4efb\u52a1\uff0c\u7136\u540e\u6839\u636e  tid \u53bb\u8bfb\u53d6\u4efb\u52a1\uff0c\u518d\u5206\u53d1\u7ed9\u7ebf\u7a0b\u6c60\u53bb\u5904\u7406\u3002<\/p>\n
\u5728\u5b58\u5728\u5e76\u53d1\u7ade\u4e89\u7684\u60c5\u666f\u4e0b\uff0c\u5f88\u91cd\u8981\u7684\u5c31\u662f\u501f\u52a9\u6570\u636e\u5e93\u4e8b\u52a1\u7684ACID\u6765\u8fbe\u5230\u4e00\u79cd CAS \u7684\u6548\u679c\uff1b\u6b63\u786e\u5904\u7406\u5e76\u53d1\u95ee\u9898\u603b\u662f\u9700\u8981\u57fa\u7840\u7684 CAS \u64cd\u4f5c\u6216\u9501\u3002<\/p>\n\n
\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: coderbee\u7b14\u8bb0<\/strong>\uff0c\u53ef\u4ee5\u66f4\u53ca\u65f6\u56de\u590d\u4f60\u7684\u8ba8\u8bba\u3002<\/p>\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6700\u8fd1\u68b3\u7406\u5176\u4ed6\u540c\u4e8b\u4ee5\u524d\u5199\u7684 job \u540e\u6709\u70b9\u60f3\u6cd5\uff0c\u8bb0\u5f55\u4e0b\u3002 \u4e00\u3001\u4e1a\u52a1\u573a\u666f \u5728\u5927\u591a\u6570\u7684 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[208,207],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/1122"}],"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=1122"}],"version-history":[{"count":7,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/1122\/revisions"}],"predecessor-version":[{"id":1129,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/1122\/revisions\/1129"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=1122"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=1122"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=1122"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}