{"id":4141,"date":"2018-10-29T08:14:35","date_gmt":"2018-10-29T00:14:35","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=4141"},"modified":"2018-10-29T08:14:35","modified_gmt":"2018-10-29T00:14:35","slug":"go%e8%af%ad%e8%a8%80%e7%bc%96%e7%a8%8b%e7%bb%83%e4%b9%a01-%e5%ae%9a%e6%97%b6%e5%99%a8timer","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/4141.html","title":{"rendered":"Go\u8bed\u8a00\u7f16\u7a0b\u7ec3\u4e60#1-\u5b9a\u65f6\u5668timer"},"content":{"rendered":"<p>=Start=<\/p>\n<h4 id=\"id-\u6a21\u677f-\u7f18\u7531\uff1a\">\u7f18\u7531\uff1a<\/h4>\n<p>\u6700\u8fd1\u5728\u5b66\u4e60Go \u8bed\u8a00\uff0c\u6240\u4ee5\u4f1a\u5728\u6ca1\u4e8b\u7684\u65f6\u5019\u591a\u7ec3\u4e60\u4e00\u4e0b\u5982\u4f55\u7528Go \u8bed\u8a00\u5b9e\u73b0\u4e00\u4e9b\u5e38\u89c4\u5f00\u53d1\u4efb\u52a1\u4e2d\u7684\u529f\u80fd\uff0c\u65b9\u4fbf\u4ee5\u540e\u9700\u8981\u7684\u65f6\u5019\u5feb\u901f\u53c2\u8003\u3002<\/p>\n<h4 id=\"id-\u6a21\u677f-\u6b63\u6587\uff1a\">\u6b63\u6587\uff1a<\/h4>\n<h5 id=\"id-\u6a21\u677f-\u53c2\u8003\u89e3\u7b54\uff1a\">\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n<p>\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre class=\"lang:default decode:true \">package main\r\n\r\nimport (\r\n    \"log\"\r\n    \"time\"\r\n)\r\n\r\nfunc main() {\r\n    log.Println(\"start\")\r\n    input := make(chan interface{})\r\n\r\n    \/\/ producer - produce the messages to channel\r\n    go func() {\r\n        for i := 0; i &lt; 5; i++ {\r\n            input &lt;- i\r\n        }\r\n        input &lt;- \"hello, world\"\r\n    }()\r\n\r\n    t1 := time.NewTimer(time.Second * 5)\r\n    t2 := time.NewTimer(time.Second * 10)\r\n\r\n    for {\r\n        \/\/ \u5982\u679c\u628a\u4e0b\u9762\u7684 (Timer).Reset \u6ce8\u91ca\u6389\u4e4b\u540e\uff0c\u5728\u6267\u884c\u5230\u7b2c10\u79d2\u7684\u65f6\u5019\u5c31\u4f1a\u62a5\u9519\uff08\u6240\u6709\u7684goroutines\u90fd\u5165\u7761\u4e86\uff09\r\n        select { \/\/ fatal error: all goroutines are asleep - deadlock!\r\n        \/\/ consumer - consume the messages from channel\r\n        case msg := &lt;-input:\r\n            time.Sleep(time.Second)\r\n            log.Println(msg)\r\n\r\n        case &lt;-t1.C:\r\n            log.Println(\"5s timer\")\r\n            t1.Reset(time.Second * 5) \/\/ \u56e0\u4e3a select \u5728\u6b7b\u5faa\u73af\u4e2d\uff0c\u6240\u4ee5\u9700\u8981\u4e0d\u65ad\u7684\u91cd\u7f6e\u5b9a\u65f6\u5668\r\n\r\n        case &lt;-t2.C:\r\n            log.Println(\"10s timer\")\r\n            t2.Reset(time.Second * 10)\r\n        }\r\n    }\r\n}<\/pre>\n<p>&amp;<\/p>\n<pre class=\"lang:default decode:true \">2018\/10\/24 19:41:53 start\r\n2018\/10\/24 19:41:54 0\r\n2018\/10\/24 19:41:55 1\r\n2018\/10\/24 19:41:56 2\r\n2018\/10\/24 19:41:57 3\r\n2018\/10\/24 19:41:58 4\r\n2018\/10\/24 19:41:58 5s timer\r\n2018\/10\/24 19:41:59 hello, world\r\n2018\/10\/24 19:42:03 10s timer\r\n2018\/10\/24 19:42:03 5s timer\r\n2018\/10\/24 19:42:08 5s timer\r\n2018\/10\/24 19:42:13 10s timer\r\n2018\/10\/24 19:42:13 5s timer\r\n2018\/10\/24 19:42:18 5s timer\r\n2018\/10\/24 19:42:23 10s timer\r\n2018\/10\/24 19:42:23 5s timer\r\n2018\/10\/24 19:42:28 5s timer\r\n2018\/10\/24 19:42:33 10s timer\r\n2018\/10\/24 19:42:33 5s timer\r\n^Csignal: interrupt<\/pre>\n<p>\u521a\u770b\u5230\u8fd9\u6bb5\u4ee3\u7801\u7684\u65f6\u5019\uff0c\u5bf9case\u5b50\u53e5\u4e2d\u7684t1.C\u548ct2.C\u6bd4\u8f83\u597d\u5947\uff0c\u6240\u4ee5\u53bb\u770b\u4e86\u4e00\u4e0b\u6587\u6863\uff1a<\/p>\n<pre class=\"lang:default decode:true \">\/*\r\nThe Timer type represents a single event. When the Timer expires, the current time will be sent on C, unless the Timer was created by AfterFunc. A Timer must be created with NewTimer or AfterFunc.\r\n\r\nTimer\u7c7b\u578b\u8868\u793a\u5355\u4e2a\u4e8b\u4ef6\u3002\u5f53\u8ba1\u65f6\u5668Timer\u8fc7\u671f\u65f6\uff0c\u5f53\u524d\u65f6\u95f4\u5c06\u88ab\u53d1\u9001\u5230\u5b57\u6bb5C\u4e0a\uff0c\u9664\u975e\u8ba1\u65f6\u5668Timer\u662f\u7531AfterFunc\u521b\u5efa\u7684\u3002\u8ba1\u65f6\u5668Timer\u5fc5\u987b\u4f7f\u7528NewTimer\u6216AfterFunc\u521b\u5efa\u3002\r\n*\/\r\ntype Timer struct {\r\n    C &lt;-chan Time\r\n    \/\/ contains filtered or unexported fields\r\n}\r\n\/\/ \u7531Timer\u7684\u7ed3\u6784\u8bf4\u660e\u53ef\u77e5\uff0c\u5b57\u6bb5C\u662f\u4e00\u4e2achannel<\/pre>\n<p>\u518d\u7ed3\u5408\u6700\u521d\u7684\u90a3\u4e2a\u4f8b\u5b50\u6765\u770b\uff0c<span style=\"color: #ff0000;\"><strong>\u5728Go \u8bed\u8a00\u4e2d\u4f7f\u7528Timer\u6765\u5b9e\u73b0\u5b9a\u65f6\u5668\u7684\u601d\u8def\u5c31\u662f\u901a\u8fc7\u00a0channel\u00a0\u7684\u963b\u585e\u6765\u8fbe\u5230\u5b9a\u65f6\u8c03\u7528\u7684\u76ee\u7684\u3002<\/strong>\u5728\u9700\u8981\u5468\u671f\u6267\u884c\u7684\u5730\u65b9\uff0c\u8fdb\u884c channel \u8bfb\u53d6\u64cd\u4f5c\uff0c\u5f53\u9884\u5b9a\u65f6\u95f4\u5230\uff0cchannel \u4e2d\u88ab\u5199\u5165\u503c\uff0c\u963b\u585e\u89e3\u9664\uff0c\u8c03\u7528\u81ea\u5b9a\u4e49\u7684\u51fd\u6570\/\u529f\u80fd\u3002<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>\u518d\u6765\u4e00\u4e2a\u300c\u9ad8\u7ea7\u4e00\u70b9\u300d\u7684\u6837\u4f8b\uff1a<\/p>\n<pre class=\"lang:default decode:true \">package main\r\n\r\nimport (\r\n    \"log\"\r\n    \"reflect\"\r\n    \"time\"\r\n)\r\n\r\n\/*\r\n\u5728 \u8d77\u59cb\u65f6\u95f4-start \u4e14\u540e\u7eed \u6bcf\u9694-interval \u5c31\u6267\u884c \u51fd\u6570-jobFunc \u53c2\u6570\u5217\u8868\u4e3a-jobArgs\r\n*\/\r\n\/\/ sched to start scheduler job at start time by interval duration.\r\nfunc sched(jobFunc interface{}, start, interval string, jobArgs ...interface{}) {\r\n    \/\/ \u5229\u7528\u53cd\u5c04 reflect \u68c0\u67e5\u53c2\u6570 jobFunc \u662f\u5426\u4e3a\u51fd\u6570\u7c7b\u578b\r\n    jobValue := reflect.ValueOf(jobFunc)\r\n    if jobValue.Kind() != reflect.Func {\r\n        log.Panic(\"only function can be schedule.\")\r\n    }\r\n\r\n    \/\/ \u68c0\u67e5\u4f20\u5165 jobArgs \u4e2a\u6570\u548c jobFunc \u53c2\u6570\u4e2a\u6570\u662f\u5426\u76f8\u540c\r\n    if len(jobArgs) != jobValue.Type().NumIn() {\r\n        log.Panic(\"The number of args valid.\")\r\n    }\r\n    \/\/ Get job function args.\r\n    in := make([]reflect.Value, len(jobArgs))\r\n    for i, arg := range jobArgs {\r\n        in[i] = reflect.ValueOf(arg)\r\n    }\r\n\r\n    \/\/ \u89e3\u6790\u4f20\u5165\u7684 interval \u95f4\u9694\r\n    d, err := time.ParseDuration(interval)\r\n    if err != nil {\r\n        log.Panic(err)\r\n    }\r\n    location, err := time.LoadLocation(\"Asia\/Shanghai\")\r\n    if err != nil {\r\n        log.Panic(err)\r\n    }\r\n    t, err := time.ParseInLocation(\"15:04:05\", start, location)\r\n    if err != nil {\r\n        log.Panic(err)\r\n    }\r\n    now := time.Now()\r\n\r\n    \/\/ Start time.\r\n    t = time.Date(now.Year(), now.Month(), now.Day(), t.Hour(), t.Minute(), t.Second(), 0, location)\r\n\r\n    if now.After(t) {\r\n        t = t.Add((now.Sub(t)\/d + 1) * d)\r\n    }\r\n\r\n    \/\/ \u6839\u636e\u4f20\u5165\u7684 \u8ba1\u5212\u6267\u884c\u65f6\u95f4-start \u548c \u5f53\u524d\u65f6\u95f4-now \u4f5c\u6bd4\u8f83\u51b3\u5b9a\u662f\u5426\u9700\u8981 Sleep \u540e\u518d\u8fdb\u884c\u7b2c\u4e00\u6b21\u8c03\u7528\r\n    log.Println(t.Sub(now))\r\n    time.Sleep(t.Sub(now)) \/\/ \u5982\u679c\u542f\u52a8\u65f6\u95f4 start \u8bbe\u7f6e\u7684\u6bd4\u5f53\u524d\u65f6\u95f4\u8981\u65e9\uff0c\u5219\u4e0d Sleep \uff0c\u4f46\u662f\u5b9a\u65f6\u4efb\u52a1\u8fd8\u662f\u4f1a\u7b49\u5230\u4e0b\u4e00\u4e2a\u6574\u9664 interval \u7684\u65f6\u95f4\u70b9\u624d\u4f1a\u6267\u884c\r\n    go jobValue.Call(in)\r\n    \/\/ log.Printf(\"go jobValue.Call(in) =&gt; %T.call(%T)\", jobValue, in)\r\n    \/\/ log.Printf(\"go jobValue.Call(in) =&gt; %q.call(%q)\", jobValue, in)\r\n    \/\/ log.Printf(\"go jobValue.Call(in) =&gt; %v.call(%d)\", jobValue, in)\r\n    \/\/ \u7136\u540e\u518d\u65b0\u5efa\u4e00\u4e2a Ticker \u7528\u4e8e\u5b9a\u65f6\u8c03\u7528\r\n    ticker := time.NewTicker(d)\r\n    go func() {\r\n        for _ = range ticker.C {\r\n            \/\/ log.Println(ticker)\r\n            \/\/ time.Sleep(time.Second)\r\n            go jobValue.Call(in)\r\n        }\r\n    }()\r\n}\r\n\r\n\/\/ \u53ef\u9009\u53c2\u6570\r\nfunc foo(params ...int) {\r\n    log.Println(params)\r\n}\r\n\r\n\/\/ \u56fa\u5b9a\u53c2\u6570\r\nfunc foo2(params int) {\r\n    time.Sleep(time.Duration(200) * time.Millisecond)\r\n    log.Println(params)\r\n}\r\n\r\n\/\/ \u56fa\u5b9a\u53c2\u6570\r\nfunc foo3(year, day, hour int) {\r\n    \/\/ time.Sleep(time.Second)\r\n    log.Println(year, day, hour)\r\n}\r\n\r\nfunc main() {\r\n    now := time.Now()\r\n    aChan := make(chan int, 1)\r\n    \/\/\r\n    \/\/ sched(foo, \"21:05:35\", \"5s\", now.Year())\r\n    \/\/ sched(foo, \"21:05:35\", \"5s\", now.Year(), now.Month(), now.Day()) \/\/ panic: The number of args valid.\r\n    \/\/ sched(foo2, \"21:05:35\", \"5s\", now.Year())\r\n    sched(foo3, \"21:21:51\", \"3s\", now.Year(), now.Day(), now.Hour())\r\n    \/\/ sched(now, \"20:53:05\", \"5s\", now.Year())\r\n    \/\/\r\n    \/\/ \u963b\u585e\u4e3b\u7ebf\u7a0b\uff0c\u5426\u5219\u4e3b\u7ebf\u7a0b\u6267\u884c\u5b8c\u5c31\u9000\u51fa\u4e86\uff0c\u5b9a\u65f6\u4efb\u52a1\u5c31\u65e0\u6cd5\u6267\u884c\r\n    &lt;-aChan\r\n}\r\n<\/pre>\n<p>&nbsp;<\/p>\n<h5 id=\"id-\u6a21\u677f-\u53c2\u8003\u94fe\u63a5\uff1a\">\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n<ul>\n<li><a href=\"https:\/\/my.oschina.net\/lwl1989\/blog\/1817024\">\u5982\u4f55\u7528golang\u5b9e\u73b0\u4e00\u4e2a\u5b9a\u65f6\u5668\u4efb\u52a1\u961f\u5217<\/a>#<span style=\"color: #ff0000;\">nice<\/span><\/li>\n<li><a href=\"https:\/\/www.cnblogs.com\/unqiang\/p\/6775617.html\">go\u7684timer\u5b9a\u65f6\u5668\u5b9e\u73b0<\/a><\/li>\n<li><a href=\"https:\/\/www.jianshu.com\/p\/dd0536797a8e\">Golang \u5b9e\u73b0\u7b80\u5355\u7684\u5b9a\u65f6\u5668<\/a>\u00a0#<span style=\"color: #ff0000;\"><strong>nice<\/strong><\/span><\/li>\n<li><a href=\"https:\/\/blog.csdn.net\/cabing2005\/article\/details\/67636336\">golang\u7684\u5b9a\u65f6\u5668<\/a><\/li>\n<li><a href=\"https:\/\/tonybai.com\/2016\/12\/21\/how-to-use-timer-reset-in-golang-correctly\/\">\u8bbagolang Timer Reset\u65b9\u6cd5\u4f7f\u7528\u7684\u6b63\u786e\u59ff\u52bf<\/a><\/li>\n<li><a href=\"https:\/\/www.cnblogs.com\/zhangym\/p\/5760324.html\">golang \u5b9a\u65f6\u5668<\/a><\/li>\n<li><a href=\"http:\/\/blog.studygolang.com\/2014\/02\/go_crontab\/\">Go\u8bed\u8a00\u7248crontab<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/robfig\/cron\">a cron library for go<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/jakecoffman\/cron\">a cron library for go, updated to have removable jobs<\/a><\/li>\n<\/ul>\n<p>=END=<\/p>\n","protected":false},"excerpt":{"rendered":"<p>=Start= \u7f18\u7531\uff1a \u6700\u8fd1\u5728\u5b66\u4e60Go \u8bed\u8a00\uff0c\u6240\u4ee5\u4f1a\u5728\u6ca1\u4e8b\u7684\u65f6\u5019\u591a\u7ec3\u4e60\u4e00\u4e0b\u5982\u4f55\u7528Go \u8bed\u8a00\u5b9e\u73b0\u4e00\u4e9b\u5e38\u89c4\u5f00\u53d1\u4efb\u52a1 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,7],"tags":[1241,564,1240,1239],"class_list":["post-4141","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-programing","tag-cron","tag-golang","tag-ticker","tag-timer"],"views":3153,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4141","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=4141"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4141\/revisions"}],"predecessor-version":[{"id":4142,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4141\/revisions\/4142"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=4141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=4141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=4141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}