MethodInterceptor가 HttpInvoker 호출을 다시 시도합니다.

Question

풍부한 클라이언트 GUI에서 Spring Framework HttpInvoker을 사용하고 있습니다. 때로 사람들은 인터넷 연결이 끊어지며 인터넷 연결이 끊어지면 응용 프로그램이 중단됩니다. 포기하기 전에 실패한 방법을 두 번 다시 시도하고 싶습니다.

항상

Object result = methodInvocation.proceed(); 

폭탄 RuntimeException가 NullPointerException 배치와 아웃 :

난의 제 부름이를 달성하는 방법 인터셉터 쓰기 시도.

이 메서드를 methodInvocation.proceed() 번으로 여러 번 호출하거나 트릭 할 수 있습니까?

public class RetryConnectionTool implements MethodInterceptor 
    { 
    private static int FailureCount = 0; 
    static Logger logger = Logger.getLogger(RetryConnectionTool.class); 
    /** 
    * 4 seconds of sleep 
    */ 
    private int SleepTime = 4000; 

    public RetryConnectionTool() 
     { 
     } 

    public Object invoke(MethodInvocation methodInvocation) throws Throwable 
     { 
     return tryInvoke(methodInvocation, new Integer(0)); 
     } 

    private Object tryInvoke(MethodInvocation methodInvocation, Integer tryCount) throws Throwable 
     { 
     try 
      { 
      //if we have failed 10 times in the past or retried 3 times to no success shut it down 
      if (FailureCount >= 10 || (tryCount != null && tryCount >= 3)) 
       { 
       logger.error("internet issue failure " + methodInvocation.getMethod().toGenericString()); 
       System.exit(-1); 
       return null; 

       } 
      if (tryCount != null && tryCount >= 1) 
       { 
       if (tryCount == 0) //increment the failure count on every first retry 
        FailureCount++; 
       tryCount++; 
       Thread.sleep(SleepTime); 
       } 


      Object result = methodInvocation.proceed(); 

      //if we have tried more than once and there is already a record of a failure we try again 
      if (tryCount != null && tryCount > 1 && FailureCount > 1) 
       { 
       String messagePassed = "There seems to be a problem with your internet connection. It the problem persists Iridium Suite will be forced to close.\n" + 
         "Please evaluate your internet connectivity."; 
       JOptionPane.showMessageDialog(null, messagePassed, "WARNING", JOptionPane.WARNING_MESSAGE); 
       } 
      return result; 

      } 
     catch (org.springframework.remoting.RemoteConnectFailureException x) 
      { 
      logger.error("internet issue " + methodInvocation.getMethod().toGenericString(), x); 
      //retry on failure 
      return tryInvoke(methodInvocation, tryCount); 
      } 
     catch (RemoteLookupFailureException x) 
      { 
      logger.error("internet issue " + methodInvocation.getMethod().toGenericString(), x); 
      //retry on failure 
      return tryInvoke(methodInvocation, tryCount); 
      } 
     catch (java.net.ConnectException x) 
      { 
      logger.error("internet issue " + methodInvocation.getMethod().toGenericString(), x); 
      //retry on failure 
      return tryInvoke(methodInvocation, tryCount); 
      } 
     catch (RuntimeException x) 
      { 
      throw x; 
      } 
     catch (Exception x) 
      { 
      throw x; 
      } 
     catch (Throwable x) 
      { 
      throw x; 
      } 

     } 
    } 

Answer 1

은 사용 : ((ProxyMethodInvocation) invocation).invocableClone().proceed();

진행 한 번만 MethodInvocation을 당 호출 할 수 있습니다. the "Invoking proceed() more than once" section of the "Professional Java Development with the Spring Framework" book.