我正在使用一個線程設置多個線程(服務)的設置,將它們一起運行以模擬系統的運行,然後在最後加入它們並處理終止等。我的測試作爲服務之一運行,並通過JMS與其他服務進行通信。對於我的一個測試,我需要訪問另一個線程中包含的私有變量。我無法將在其他線程中運行的代碼更改爲添加訪問方法或通過JMS發送變量。由於框架設置的方式,我也沒有辦法將對希望訪問的服務的引用傳遞到我的測試服務中。跨線程反射
我知道包含我需要訪問的類的線程的名稱,並且我可以通過枚舉正在運行的線程來獲取對線程的引用,但我不知道如何從線程一旦我得到它。
有什麼方法可以讓我使用反射或其他技術來獲得對另一個線程中類的引用嗎?
編輯:這裏是對情況的例子我在:
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;
}
}
}
私有變量不屬於線程。你能解釋更多的小動物嗎?你的意思是,Thread的子類的實際實例的成員變量? –
@SteveMcLeod我的意思是一個Runnable類的實例的成員變量。 –