{"id":1523,"date":"2017-05-14T18:11:30","date_gmt":"2017-05-14T10:11:30","guid":{"rendered":"http:\/\/coderbee.net\/?p=1523"},"modified":"2017-05-14T18:11:30","modified_gmt":"2017-05-14T10:11:30","slug":"btrace-demo","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/jvm\/20170514\/1523","title":{"rendered":"BTrace demo"},"content":{"rendered":"<p>\u4e0d\u4e86\u89e3\u7684 <a href=\"https:\/\/github.com\/btraceio\/btrace\">BTrace<\/a> \u7684\u53ef\u4ee5\u5148\u770b <a href=\"http:\/\/coderbee.net\/index.php\/jvm\/20170514\/1519\">BTrace \u7528\u6237\u6307\u5357<\/a> \u3002<\/p>\n<h1>\u88ab\u8ddf\u8e2a\u7684\u7a0b\u5e8f<\/h1>\n<pre><code class=\"java\">package net.coderbee.btrace;\n\nimport java.util.concurrent.ExecutorService;\nimport java.util.concurrent.Executors;\nimport java.util.concurrent.atomic.AtomicInteger;\n\n\/**\n * @author coderbee 2017\u5e745\u67089\u65e5 \u4e0b\u53489:50:18\n *\n *\/\npublic class BtraceObservable {\n    private AtomicInteger counter = new AtomicInteger();\n\n    public String targetMethod(int i) {\n        try {\n            Thread.sleep(2000);\n\n            if (i % 10 == 0) {\n                throw new IllegalStateException(\"\u6d4b\u8bd5\u629b\u5f02\u5e38\u72b6\u6001\u3002\");\n            }\n        } catch (Exception e) {\n            e.printStackTrace();\n        }\n\n        return Thread.currentThread().getName() + \"--\" + i + \" returned.\";\n    }\n\n    private int tcount() {\n        return counter.incrementAndGet();\n    }\n\n    \/**\n     * @param args\n     *\/\n    public static void main(String[] args) {\n        BtraceObservable observable = new BtraceObservable();\n        System.err.println(observable);\n\n        ExecutorService service = Executors.newFixedThreadPool(2);\n        service.submit(new Runnable() {\n            @Override\n            public void run() {\n                for (int i = 0; i &lt; 10000; i++) {\n                    int count = observable.tcount();\n                    String string = observable.targetMethod(count);\n                    System.out.println(string);\n                }\n            }\n        });\n\n        service.shutdown();\n    }\n\n}\n\n<\/code><\/pre>\n<h1>\u8ddf\u8e2a\u811a\u672c<\/h1>\n<pre><code class=\"java\">package net.coderbee.btrace;\n\nimport com.sun.btrace.BTraceUtils;\nimport com.sun.btrace.annotations.BTrace;\nimport com.sun.btrace.annotations.Kind;\nimport com.sun.btrace.annotations.Location;\nimport com.sun.btrace.annotations.OnMethod;\nimport com.sun.btrace.annotations.ProbeClassName;\nimport com.sun.btrace.annotations.ProbeMethodName;\nimport com.sun.btrace.annotations.Return;\nimport com.sun.btrace.annotations.Self;\nimport com.sun.btrace.annotations.TargetInstance;\nimport com.sun.btrace.annotations.TargetMethodOrField;\n\n@BTrace\npublic class BtraceScript {\n\n    \/**\n     * \u53ef\u4ee5\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u5339\u914d\u591a\u4e2a\u7c7b\u3001\u591a\u4e2a\u65b9\u6cd5\uff0c\u7136\u540e\u7528\u6ce8\u89e3 @ProbeClassName \u83b7\u5f97\u88ab\u8c03\u7528\u7684\u7c7b\uff0c @ProbeMethodName\n     * \u83b7\u5f97\u88ab\u8c03\u7528\u7684\u65b9\u6cd5\u3002\n     * \n     * \u6ce8\u610f\u6b63\u5219\u8868\u8fbe\u5f0f\u5b9a\u4e49\n     *\/\n    \/\/ \/java\\\\.io\\\\..*Input.*\/\n    @OnMethod(\n            clazz = \"net.coderbee.btrace.BtraceObservable\",\n            method = \"\/t.*\/\")\n    public static void func(@ProbeClassName String className,\n            @ProbeMethodName String methodName) {\n        BTraceUtils.println(\"ProbeClassName:\" + className + \", ProbeMethodName:\"\n                + methodName);\n    }\n\n    \/**\n     * \u7528 @Return \u83b7\u53d6\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\n     *\/\n    @OnMethod(\n            clazz = \"net.coderbee.btrace.BtraceObservable\",\n            method = \"targetMethod\",\n            location = @Location(Kind.RETURN) )\n    public static void retVal(@Return String retVal) {\n        BTraceUtils.println(\"target method return:\" + retVal);\n    }\n\n    \/**\n     * \u83b7\u53d6\u8c03\u7528\u5bf9\u8c61\u3001\u88ab\u8c03\u7528\u5bf9\u8c61\u3001\u8c03\u7528\u65b9\u6cd5\u7684\u4fe1\u606f\n     *\/\n    @OnMethod(clazz = \"net.coderbee.btrace.BtraceObservable\",\n            method = \"tcount\",\n            location = @Location(value = Kind.CALL, clazz = \"\/.*\/\",\n                    method = \"\/.*\/\") )\n    public static void call(@Self Object self, @TargetInstance Object target,\n            @TargetMethodOrField String method) {\n        BTraceUtils.println(\"on call, self:\" + self + \"\\ntarget:\" + target\n                + \", method:\" + method);\n    }\n\n    \/**\n     * \u8ddf\u8e2a\u5f02\u5e38\u7c7b\u7684\u521d\u59cb\u5316\u3002\u5982\u679c \u7c7b\u6709\u591a\u4e2a\u6784\u9020\u51fd\u6570\uff0c\u53ef\u4ee5\u91cd\u8f7d\u5bf9\u5e94\u7684\u65b9\u6cd5\u3002\n     * \n     * @param self\n     *            \u65b0\u521b\u5efa\u7684\u5f02\u5e38\n     *\/\n    @OnMethod(\n            clazz = \"java.lang.Throwable\",\n            method = \"&lt;init&gt;\")\n    public static void onthrow(@Self Throwable self) {\n        BTraceUtils.println(self);\n    }\n}\n\n<\/code><\/pre>\n<hr\/>\n<p>\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: <strong>coderbee\u7b14\u8bb0<\/strong>\uff0c\u53ef\u4ee5\u66f4\u53ca\u65f6\u56de\u590d\u4f60\u7684\u8ba8\u8bba\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"258\" height=\"258\" src=\"https:\/\/coderbee.net\/wp-content\/uploads\/2019\/01\/coderbee-note.jpg\" class=\"alignnone size-full wp-image-1707\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0d\u4e86\u89e3\u7684 BTrace \u7684\u53ef\u4ee5\u5148\u770b BTrace \u7528\u6237\u6307\u5357 \u3002 \u88ab\u8ddf\u8e2a\u7684\u7a0b\u5e8f p &hellip; <a href=\"https:\/\/coderbee.net\/index.php\/jvm\/20170514\/1523\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/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":[96],"tags":[273],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/1523"}],"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=1523"}],"version-history":[{"count":2,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/1523\/revisions"}],"predecessor-version":[{"id":1526,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/1523\/revisions\/1526"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=1523"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=1523"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=1523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}