如何判断这个方法的调用来自dubbo consumer

Posted 2022-11-27 汪小哥

这个是比较好玩的一个问题？ 如何判断呢？

• 1、Thread.name

Thread.currentThread().getName().startsWith("DubboServerHandler")

• 2、org.apache.dubbo.rpc.RpcContext.getContext()

 org.apache.dubbo.common.URL url = org.apache.dubbo.rpc.RpcContext.getContext().getUrl();
if (url !=null &&  RpcContext.getContext().isProviderSide()) 
    System.out.println("this is consumer");

• 3、堆栈判断最后的几个是否存在dubbo的调用

public static boolean isDubboInvoke() 
    StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();

    boolean result = false;
    int count = 0;
    for (int index = stackTrace.length - 1; index >= 0; index--) 
        count++;
        if (stackTrace[index].getClassName().contains("org.apache.dubbo.remoting")) 
            result = true;
            break;
        
        if (count > MAX_LOOP) 
            break;
        
    
    return result;

• 4 sun.reflect.Reflection

https://blog.csdn.net/weixin_34203832/article/details/93609519

 Class<?> callerClass = sun.reflect.Reflection.getCallerClass(1);
 System.out.println(callerClass.getName());

• 5 sun.misc.SharedSecrets.getJavaLangAccess

public static void main(String[] args) 
    JavaLangAccess access = sun.misc.SharedSecrets.getJavaLangAccess();
    Throwable throwable = new Throwable();
    int stackTraceDepth = access.getStackTraceDepth(throwable);
    for (int traceDepth = stackTraceDepth-1; traceDepth >=0; traceDepth--) 
        System.out.println( access.getStackTraceElement(throwable, traceDepth).getClassName());
    
  

https://stackoverflow.com/questions/23808803/sun-reflect-reflection-getcallerclass-alternative

https://stackoverflow.com/questions/421280/how-do-i-find-the-caller-of-a-method-using-stacktrace-or-reflection