TestNG中的IInvokedMethodListener和IMethodInterceptor有什么区别?

问题描述

在Java中，侦听器和侦听器之间的基本区别是什么?如果我同时添加两者，哪个会先被调用?

Whats the basic difference between Interceptor and Listener in java? If i add both, which will be invoked first?

推荐答案

1)IMethodInterceptor允许用户修改要执行的方法(或Test)的列表.2)IInvokedMethodListener允许用户在执行方法之前/之后执行某些操作.诸如清理或设置之类的东西.3)首先调用IMethodInterceptor，以便如果用户希望修改要执行的方法列表，则用户可以对其进行更改并将其传递给TestRunner.请参见下面的示例代码:

1) IMethodInterceptor allows user to modify the list of methods (or Test) to be executed.2) IInvokedMethodListener allows user to perform certain action before/after a method has been executed. something like clean up or setup.3) First IMethodInterceptor is called so that if user wishes to modify the list of method to be executed then a user can change it and pass it to TestRunner.Please see below example code:

    package practise;

import org.testng.IInvokedMethod;
import org.testng.IInvokedMethodListener2;
import org.testng.ITestContext;
import org.testng.ITestResult;

public class InvokedMethodListener implements IInvokedMethodListener2
{
    @Override
    public void afterInvocation(IInvokedMethod arg0, ITestResult arg1)
    {
        System.out.println(Thread.currentThread().getStackTrace()[0].getMethodName());
    }

    @Override
    public void beforeInvocation(IInvokedMethod arg0, ITestResult arg1)
    {
        System.out.println(Thread.currentThread().getStackTrace()[0].getMethodName());
    }

    @Override
    public void afterInvocation(IInvokedMethod arg0, ITestResult arg1, ITestContext arg2)
    {
        System.out.println(Thread.currentThread().getStackTrace()[1].getMethodName());
    }

    @Override
    public void beforeInvocation(IInvokedMethod arg0, ITestResult arg1, ITestContext arg2)
    {
        System.out.println(Thread.currentThread().getStackTrace()[1].getMethodName());
    }

}


    package practise;

import java.util.List;

import org.testng.IMethodInstance;
import org.testng.IMethodInterceptor;
import org.testng.ITestContext;

public class MethodInterceptor implements IMethodInterceptor
{

    @Override
    public List<IMethodInstance> intercept(List<IMethodInstance> arg0, ITestContext arg1)
    {
        System.out.println(Thread.currentThread().getStackTrace()[1].getMethodName());
        return arg0;
    }

}

    package practise;

import org.testng.annotations.Listeners;

@Listeners(value={MethodInterceptor.class,InvokedMethodListener.class})
public class Test
{
    @org.testng.annotations.Test
    public void first()
    {
        System.out.println(Thread.currentThread().getStackTrace()[1].getMethodName());
    }

    @org.testng.annotations.Test
    public void second()
    {
        System.out.println(Thread.currentThread().getStackTrace()[1].getMethodName());
    }
}

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