interceptorinvoker.java

java1.6众多例子参考

		}
		
		// Only step through the interceptors whose starting points
		// have successfully returned.
		// Unlike the previous loop, this one counts backwards for a 
		// reason - we must execute these in the reverse order of the
		// starting points.
		for( int i = (flowStackIndex - 1); i >= 0; i-- ) {
		    
		    try {
			switch( endingPointCall ) {
			case ClientRequestInfoImpl.CALL_RECEIVE_REPLY:
			    clientInterceptors[i].receive_reply( info );
			    break;
			case ClientRequestInfoImpl.CALL_RECEIVE_EXCEPTION:
			    clientInterceptors[i].receive_exception( info );
			    break;
			case ClientRequestInfoImpl.CALL_RECEIVE_OTHER:
			    clientInterceptors[i].receive_other( info );
			    break;
			}
		    }
		    catch( ForwardRequest e ) {

			// as per PI spec (orbos/99-12-02 sec 5.2.1.), if
			// interception point throws a ForwardException, 
			// ending point call changes to receive_other.
			endingPointCall = 
			    ClientRequestInfoImpl.CALL_RECEIVE_OTHER;
			info.setEndingPointCall( endingPointCall );
			info.setReplyStatus( LOCATION_FORWARD.value );
			info.setForwardRequest( e );
			updateClientRequestDispatcherForward( info );
		    }
		    catch( SystemException e ) {

			// as per PI spec (orbos/99-12-02 sec 5.2.1.), if
			// interception point throws a SystemException, 
			// ending point call changes to receive_exception.
			endingPointCall = 
			    ClientRequestInfoImpl.CALL_RECEIVE_EXCEPTION;
			info.setEndingPointCall( endingPointCall );
			info.setReplyStatus( SYSTEM_EXCEPTION.value );
			info.setException( e );
		    } 
		}
	    }
	    finally {
		// See doc for setPICurrentPushed as to why this is necessary.
		// Check info for null in case errors happen before initiate.
		if (info != null && info.isPICurrentPushed()) {
		    current.popSlotTable( );
		    // After the pop, original client's TSC slot table
		    // remains avaiable via PICurrent.
		}
	    }
        } // end enabled check
    }

    /*
     **********************************************************************
     * Server Interceptor invocation
     **********************************************************************/

    /**
     * Invokes receive_request_service_context interception points.
     */
    void invokeServerInterceptorStartingPoint( ServerRequestInfoImpl info ) {
	// If invocation is not yet enabled, don't do anything.
	if( enabled ) {
	    try {
		// Make a fresh slot table for RSC.
		current.pushSlotTable();
		info.setSlotTable(current.getSlotTable());

		// Make a fresh slot table for TSC in case
		// interceptors need to make out calls.
		current.pushSlotTable( );

		info.setCurrentExecutionPoint( info.EXECUTION_POINT_STARTING );
		
		// Get all ServerRequestInterceptors:
		ServerRequestInterceptor[] serverInterceptors = 
		    (ServerRequestInterceptor[])interceptorList.
		    getInterceptors( InterceptorList.INTERCEPTOR_TYPE_SERVER );
		int size = serverInterceptors.length;

		// We will assume that all interceptors returned successfully,
		// and adjust the flowStackIndex to the appropriate value if
		// we later discover otherwise.
		int flowStackIndex = size;
		boolean continueProcessing = true;
		
		// Currently, there is only one server-side starting point
		// interceptor called receive_request_service_contexts.
		for( int i = 0; continueProcessing && (i < size); i++ ) {
		    
		    try {
			serverInterceptors[i].
			    receive_request_service_contexts( info );
		    }
		    catch( ForwardRequest e ) {
			// as per PI spec (orbos/99-12-02 sec 5.3.1.), if
			// interception point throws a ForwardRequest, 
			// no other Interceptors' starting points are 
			// called and send_other is called.
			flowStackIndex = i;
			info.setForwardRequest( e );
			info.setIntermediatePointCall(
			    ServerRequestInfoImpl.CALL_INTERMEDIATE_NONE );
			info.setEndingPointCall( 
			    ServerRequestInfoImpl.CALL_SEND_OTHER );
			info.setReplyStatus( LOCATION_FORWARD.value );

			// For some reason, using break here causes the VM on 
			// NT to lose track of the value of flowStackIndex 
			// after exiting the for loop.  I changed this to 
			// check a boolean value instead and it seems to work 
			// fine.
			continueProcessing = false;
		    }
		    catch( SystemException e ) {

			// as per PI spec (orbos/99-12-02 sec 5.3.1.), if
			// interception point throws a SystemException, 
			// no other Interceptors' starting points are 
			// called.
			flowStackIndex = i;
			info.setException( e );
			info.setIntermediatePointCall(
			    ServerRequestInfoImpl.CALL_INTERMEDIATE_NONE );
			info.setEndingPointCall( 
			    ServerRequestInfoImpl.CALL_SEND_EXCEPTION );
			info.setReplyStatus( SYSTEM_EXCEPTION.value );

			// For some reason, using break here causes the VM on 
			// NT to lose track of the value of flowStackIndex 
			// after exiting the for loop.  I changed this to 
			// check a boolean value instead and it seems to 
			// work fine.
			continueProcessing = false;
		    }
	    
		}
		
		// Remember where we left off in the flow stack:
		info.setFlowStackIndex( flowStackIndex );
	    }
	    finally {
		// The remaining points, ServantManager and Servant
		// all run in the same logical thread.
		current.popSlotTable( );
		// Now TSC and RSC are equivalent.
	    }
        } // end enabled check
    }

    /**
     * Invokes receive_request interception points
     */
    void invokeServerInterceptorIntermediatePoint( 
        ServerRequestInfoImpl info ) 
    {
        int intermediatePointCall = info.getIntermediatePointCall();
	// If invocation is not yet enabled, don't do anything.
	if( enabled && ( intermediatePointCall != 
                         ServerRequestInfoImpl.CALL_INTERMEDIATE_NONE ) )
        {
	    // NOTE: do not touch the slotStack.  The RSC and TSC are
	    // equivalent at this point.

            info.setCurrentExecutionPoint( info.EXECUTION_POINT_INTERMEDIATE );
            
            // Get all ServerRequestInterceptors:
            ServerRequestInterceptor[] serverInterceptors = 
                (ServerRequestInterceptor[])
                interceptorList.getInterceptors( 
                InterceptorList.INTERCEPTOR_TYPE_SERVER );
            int size = serverInterceptors.length;

            // Currently, there is only one server-side intermediate point
            // interceptor called receive_request.
            for( int i = 0; i < size; i++ ) {

                try {
                    serverInterceptors[i].receive_request( info );
                }
                catch( ForwardRequest e ) {

                    // as per PI spec (orbos/99-12-02 sec 5.3.1.), if
                    // interception point throws a ForwardRequest, 
                    // no other Interceptors' intermediate points are 
                    // called and send_other is called.
		    info.setForwardRequest( e );
                    info.setEndingPointCall( 
                        ServerRequestInfoImpl.CALL_SEND_OTHER );
                    info.setReplyStatus( LOCATION_FORWARD.value );
                    break;
                }
                catch( SystemException e ) {

                    // as per PI spec (orbos/99-12-02 sec 5.3.1.), if
                    // interception point throws a SystemException, 
                    // no other Interceptors' starting points are 
                    // called.
		    info.setException( e );
                    info.setEndingPointCall( 
                        ServerRequestInfoImpl.CALL_SEND_EXCEPTION );
                    info.setReplyStatus( SYSTEM_EXCEPTION.value );
                    break;
                }
            }
        } // end enabled check
    }

    /**
     * Invokes either send_reply, send_exception, or send_other,
     * depending on the value of info.getEndingPointCall()
     */
    void invokeServerInterceptorEndingPoint( ServerRequestInfoImpl info ) {
	// If invocation is not yet enabled, don't do anything.
	if( enabled ) {
	    try {
		// NOTE: do not touch the slotStack.  The RSC and TSC are
		// equivalent at this point.

		// REVISIT: This is moved out to PIHandlerImpl until dispatch
		// path is rearchitected.  It must be there so that
		// it always gets executed so if an interceptor raises
		// an exception any service contexts added in earlier points
		// this point get put in the exception reply (via the SC Q).
		//info.setCurrentExecutionPoint( info.EXECUTION_POINT_ENDING );
		
		// Get all ServerRequestInterceptors:
		ServerRequestInterceptor[] serverInterceptors = 
		    (ServerRequestInterceptor[])interceptorList.
		    getInterceptors( InterceptorList.INTERCEPTOR_TYPE_SERVER );
		int flowStackIndex = info.getFlowStackIndex();
		
		// Determine whether we are calling 
		// send_exception, or send_other:
		int endingPointCall = info.getEndingPointCall();
		
		// Only step through the interceptors whose starting points
		// have successfully returned.
		for( int i = (flowStackIndex - 1); i >= 0; i-- ) {
		    try {
			switch( endingPointCall ) {
			case ServerRequestInfoImpl.CALL_SEND_REPLY:
			    serverInterceptors[i].send_reply( info );
			    break;
			case ServerRequestInfoImpl.CALL_SEND_EXCEPTION:
			    serverInterceptors[i].send_exception( info );
			    break;
			case ServerRequestInfoImpl.CALL_SEND_OTHER:
			    serverInterceptors[i].send_other( info );
			    break;
			}
		    }
		    catch( ForwardRequest e ) {
			// as per PI spec (orbos/99-12-02 sec 5.3.1.), if
			// interception point throws a ForwardException, 
			// ending point call changes to receive_other.
			endingPointCall = 
			    ServerRequestInfoImpl.CALL_SEND_OTHER;
			info.setEndingPointCall( endingPointCall );
			info.setForwardRequest( e );
			info.setReplyStatus( LOCATION_FORWARD.value );
			info.setForwardRequestRaisedInEnding();
		    }
		    catch( SystemException e ) {
			// as per PI spec (orbos/99-12-02 sec 5.3.1.), if
			// interception point throws a SystemException, 
			// ending point call changes to send_exception.
			endingPointCall = 
			    ServerRequestInfoImpl.CALL_SEND_EXCEPTION;
			info.setEndingPointCall( endingPointCall );
			info.setException( e );
			info.setReplyStatus( SYSTEM_EXCEPTION.value );
		    }
		}
		
		// Remember that all interceptors' starting and ending points
		// have already been executed so we need not do anything.
		info.setAlreadyExecuted( true );
	    }
            finally {
		// Get rid of the Server side RSC.
		current.popSlotTable();
	    }
        } // end enabled check
    }
    
    /*
     **********************************************************************
     * Private utility methods
     **********************************************************************/
    
    /**
     * Update the client delegate in the event of a ForwardRequest, given the 
     * information in the passed-in info object.
     */
    private void updateClientRequestDispatcherForward( 
        ClientRequestInfoImpl info ) 
    {
        ForwardRequest forwardRequest = info.getForwardRequestException();
        
        // ForwardRequest may be null if the forwarded IOR is set internal
        // to the ClientRequestDispatcher rather than explicitly through Portable
        // Interceptors.  In this case, we need not update the client 
        // delegate ForwardRequest object.
        if( forwardRequest != null ) {
            org.omg.CORBA.Object object = forwardRequest.forward;

            // Convert the forward object into an IOR:
	    IOR ior = ORBUtility.getIOR( object ) ;
	    info.setLocatedIOR( ior );
        }
    }
    
}