如何将日志写入btrace中的文件?

问题描述

限时删除！！

我有以下 btrace 脚本.我想记录特定类中函数的进入和退出.

I have following btrace script. I would like to record entry and exit of functions in a specific class.

..
package com.sun.btrace.samples;

import com.sun.btrace.BTraceUtils;
import com.sun.btrace.Profiler;
import com.sun.btrace.annotations.*;
@BTrace class Profiling {
@Property
Profiler swingProfiler = BTraceUtils.Profiling.newProfiler();

@OnMethod(
    clazz="com.pkg.classname",
    method="/.*/")
    void entry(@ProbeMethodName(fqn=true) String probeMethod) {
        BTraceUtils.print("Entry" );
        BTraceUtils.println(BTraceUtils.timestamp() );
        BTraceUtils.println(probeMethod);
    }

@OnMethod(
    clazz="com.pkg.classname",
    location=@Location(value=Kind.RETURN)
    )
    void exit(@ProbeMethodName(fqn=true) String probeMethod, @Duration long duration) {
        BTraceUtils.print("Exit:" );
        BTraceUtils.println(BTraceUtils.timestamp() );
        BTraceUtils.println(probeMethod);
    }

}

这会在控制台上发出声音.如何将结果写入文件? Btrace不允许创建新对象.

This gives outout on the console. How could I write the result to a file? Btrace does not allow to create new objects.

(明显的解决方法是重定向到文件.另一种选择是使用VisualVM btrace插件-输出随后进入visualVM窗口.请注意，它是否可以处理500Mb左右的非常大的输出.)

(Obvious work around is redirect to a file. Another choice is to use VisualVM btrace plugin - the output then goes to visualVM window. Note sure if it an handle very large output 500Mb or so.)

谢谢

推荐答案

您可以使用BTrace代理( http://kenai.com/projects/btrace/pages/UserGuide#btrace-agent ).然后，您可以为代理指定 scriptOutputFile 参数，并且通过调用 println 等生成的所有输出都将转到指定的文件，而不是标准输出.

You can start your application with BTrace agent (http://kenai.com/projects/btrace/pages/UserGuide#btrace-agent). Then you can specify scriptOutputFile argument to the agent and all output generated by calls to println etc. will go to the specified file instead of the stdout.

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