我正在使用一个线程设置多个线程(服务)的设置,将它们一起运行以模拟系统的运行,然后在最后加入它们并处理终止等。我的测试作为服务之一运行,并通过JMS与其他服务进行通信。对于我的一个测试,我需要访问另一个线程中包含的私有变量。我无法将在其他线程中运行的代码更改为添加访问方法或通过JMS发送变量。由于框架设置的方式,我也没有办法将对希望访问的服务的引用传递到我的测试服务中。跨线程反射
我知道包含我需要访问的类的线程的名称,并且我可以通过枚举正在运行的线程来获取对线程的引用,但我不知道如何从线程一旦我得到它。
有什么方法可以让我使用反射或其他技术来获得对另一个线程中类的引用吗?
编辑:这里是对情况的例子我在:
import java.lang.reflect.Field;
public class Runner
{
/**
* Pretend this is my test class.
*/
public static void main(String[] args)
{
// this is how my test starts up the system and runs the test
runTest(TestService.class);
}
/**
* Instantiate the test service and start up all of the threads in the
* system. Doesn't return until test has completed.
*
* @param testServiceClass
* the class that will run the test
*/
static void runTest(Class<? extends Service> testServiceClass)
{
try
{
// setup the services
Service testService =
testServiceClass.getConstructor(new Class<?>[] { String.class })
.newInstance("test service");
FixedService fixedService = new FixedService("fixed service");
// start the services
testService.start();
fixedService.start();
// wait for testService to signal that it is done
System.out.println("Started threads");
while (!testService.isDone())
{
try
{
Thread.sleep(1000);
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// stop the fixed service
fixedService.stop();
System.out.println("TestService done, fixed service told to shutdown");
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* I cannot modify this class. Handling of thread start is similar to real
* system.
*/
abstract static class Service implements Runnable
{
protected boolean isDone = false;
protected boolean stop = false;
private Thread thisServiceThread;
public Service(String name)
{
thisServiceThread = new Thread(this, name);
}
public boolean isDone()
{
return isDone;
}
public void start()
{
thisServiceThread.start();
}
public void stop()
{
this.stop = true;
}
}
/**
* I can modify this class. This is the class that actually runs my test.
*/
static class TestService extends Service
{
public TestService(String name)
{
super(name);
}
@Override
public void run()
{
System.out.println("TestService: started");
// TODO: How can I access FixedService.getMe from where without
// modifying FixedService?
try
{
Field field = FixedService.class.getDeclaredField("getMe");
field.setAccessible(true);
System.out.println(field.get(null));
}
catch (SecurityException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (NoSuchFieldException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IllegalArgumentException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IllegalAccessException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("TestService: done");
isDone = true;
}
}
/**
* I cannot modify this class. This is part of the system being tested.
*/
static class FixedService extends Service
{
private boolean getMe = false;
public FixedService(String name)
{
super(name);
}
@Override
public void run()
{
System.out.println("FixedService: started");
// don't stop until signaled to do so
while (!stop)
{
try
{
Thread.sleep(1000);
}
catch (InterruptedException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("FixedService: gotMe? " + getMe);
System.out.println("FixedService: done");
isDone = true;
}
}
}
私有变量不属于线程。你能解释更多的小动物吗?你的意思是,Thread的子类的实际实例的成员变量? –
@SteveMcLeod我的意思是一个Runnable类的实例的成员变量。 –