如何重新抛出异常在AspectJ周围的建议 [英] How to re-throw exception in AspectJ around advise

问题描述

我有一些方法会抛出一些异常，我想使用AspectJ来计算执行时间，并且抛出一些异常并登录错误日志，并通过重新抛出异常来继续流。 p>

我尝试通过以下方式实现这一点，但eclipse表示未处理的异常类型。

代码对谁aspectj是使用： -

  public interface Iface {
 public void reload（）throws TException; 
 
 public TUser getUserFromUserId（int userId，String serverId）throws ResumeNotFoundException，TException; 
 
 public TUser getUserFromUsername（String username，String serverId）throws ResumeNotFoundException，TException; 
 
 public TResume getPartialActiveProfileFromUserId（int userId，int sectionsBitField，String serverId）throws ResumeNotFoundException，UserNotFoundException; 
 
 public TResume getPartialActiveProfileFromUsername（String username，int sectionsBitField，String serverId）throws ResumeNotFoundException，UserNotFoundException，TException; 
} 
  

代码aspectj： -

公共方面AspectServerLog {

public static final Logger ERR_LOG = LoggerFactory.getLogger（error）;

  
 
 Object around（）：call（* com.abc.Iface。*（..））{
 Object ret; 
 Throwable ex = null; 
 
 StopWatch watch = new Slf4JStopWatch（）; 
 
 try {
 ret = proceed（）; 
} catch（UserNotFoundException e）{
 ex = e; 
 throw e; 
} catch（ResumeNotFoundException e）{
 ex = e; 
 throw e; 
} catch（Throwable e）{
 ex = e; 
抛出新的RuntimeException（e）; 
} finally {
 
 watch.stop（thisJoinPoint.toShortString（））; 
 
 if（ex！= null）{
 StringBuilder mesg = new StringBuilder（Exception in）; 
 mesg.append（thisJoinPoint.toShortString（））。append（'（'）; 
 for（Object o：thisJoinPoint.getArgs（））{
 mesg.append（o）.append （'，'）; 
} 
 mesg.append（'）'）; 
 
 ERR_LOG.error（mesg.toString（），ex）; 
 numEx ++; 
} 
 
} 
 return ret; 
} 
} 
  

请帮助为什么这个AspectJ不工作。 p>

解决方案

您可以避免捕获异常，只需使用try / finally块即可。
如果你真的需要记录异常，你可以使用一个抛出后的建议，如下所示：

  public aspect AspectServerLog {
 
 public static final Logger ERR_LOG = LoggerFactory.getLogger（error）; 
 
 Object around（）：call（* com.abc.Iface。*（..））{
 
 StopWatch watch = new Slf4JStopWatch（）; 
 
 try {
 return proceed（）; 
} finally {
 watch.stop（thisJoinPoint.toShortString（））; 
} 
} 
 
 after（）throwing（Exception ex）：call（* com.abc.Iface。*（..））{
 StringBuilder mesg =新的StringBuilder（Exception in）; 
 mesg.append（thisJoinPoint.toShortString（））。append（'（'）; 
 for（Object o：thisJoinPoint.getArgs（））{
 mesg.append（o）.append （'，'）; 
} 
 mesg.append（'）'）; 
 
 ERR_LOG.error（mesg.toString（），ex）; 
} 
 
} 
  

I have some methods which throws some exception, and I want to use AspectJ around advise to calculate the execution time and if some exception is thrown and to log into error log and continue the flow by re-throwing the exception.

I tried to achieve this by following but eclipse says "Unhandled Exception type".

Code-against whom aspectj is to used :-

public interface Iface {
    public void reload() throws TException;

    public TUser getUserFromUserId(int userId, String serverId) throws ResumeNotFoundException, TException;

    public TUser getUserFromUsername(String username, String serverId) throws  ResumeNotFoundException, TException;

    public TResume getPartialActiveProfileFromUserId(int userId, int sectionsBitField, String serverId) throws ResumeNotFoundException, UserNotFoundException;

    public TResume getPartialActiveProfileFromUsername(String username, int sectionsBitField, String serverId) throws ResumeNotFoundException, UserNotFoundException, TException;
}

Code aspectj :-

public aspect AspectServerLog {

public static final Logger ERR_LOG = LoggerFactory.getLogger("error");

Object around() : call (* com.abc.Iface.* (..)) {
    Object ret;
    Throwable ex = null;

    StopWatch watch = new Slf4JStopWatch();

    try {
    ret = proceed();
    }catch (UserNotFoundException e) {
    ex = e ;
     throw e ;
    } catch (ResumeNotFoundException e) {
    ex = e ;
    throw e ;
    } catch (Throwable e) {
    ex = e ;
    throw new RuntimeException(e);
    }finally{

    watch.stop(thisJoinPoint.toShortString());

    if(ex!=null){
        StringBuilder mesg = new StringBuilder("Exception in ");
        mesg.append(thisJoinPoint.toShortString()).append('(');
        for(Object o : thisJoinPoint.getArgs()) {
        mesg.append(o).append(',');
        }
        mesg.append(')');

        ERR_LOG.error(mesg.toString(), ex);
        numEx++;
    }

   }
return ret;
}
}

Please help why this AspectJ is not working.

解决方案

you can avoid catching the exceptions and just use a try/finally block without the catch. And if you really need to log the exception you can use an after throwing advice, like this:

public aspect AspectServerLog {

    public static final Logger ERR_LOG = LoggerFactory.getLogger("error");

    Object around() : call (* com.abc.Iface.* (..)) {

        StopWatch watch = new Slf4JStopWatch();

        try {
            return proceed();
        } finally {
            watch.stop(thisJoinPoint.toShortString());
        }
    }

    after() throwing (Exception ex) : call (* com.abc.Iface.* (..)) {
        StringBuilder mesg = new StringBuilder("Exception in ");
        mesg.append(thisJoinPoint.toShortString()).append('(');
        for (Object o : thisJoinPoint.getArgs()) {
            mesg.append(o).append(',');
        }
        mesg.append(')');

        ERR_LOG.error(mesg.toString(), ex);
    }

}

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