public Message invoke()

in modules/implementation-java-runtime/src/main/java/org/apache/tuscany/sca/implementation/java/invocation/JavaImplementationInvoker.java [90:286]


    public Message invoke(Message msg) {
        
        Operation op = msg.getOperation();
        if (op == null) {
            op = this.operation;
        }
        Object payload = msg.getBody();

        Object contextId = null;

        EndpointReference from = msg.getFrom();

        // store the current thread context classloader
        // as we need to replace it with the class loader
        // used to load the java class as per SCA Spec
        final ClassLoader tccl = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
                public ClassLoader run() {
                    ClassLoader tccl = Thread.currentThread().getContextClassLoader();
                    return tccl;
                 }
            });
        
        // TUSCANY-3946 - If the TCCL has not already been set to the contribution classloader earlier
        // in the wire processing then
        // set it so that the thread context classloader of the thread used to invoke an operation 
        // of a Java POJO component implementation is the class loader of the contribution 
        // used to load the POJO implementation class.
        boolean swapTCCL = (msg.getHeaders().get(Constants.SUPPRESS_TCCL_SWAP) == null);
        
        try {
            // The following call might create a new conversation, as a result, the msg.getConversationID() might 
            // return a new value
            ReflectiveInstanceWrapper wrapper = (ReflectiveInstanceWrapper) scopeContainer.getWrapper(contextId);
            
            // If there is a callback interface and the implementation is stateless, we need to
            // inject callbacks at invocation time. For Composite scope, this has already been done. 
            if (( interfaze.getCallbackInterface() != null )  && (scopeContainer.getScope().equals(Scope.STATELESS))){
                // TUSCANY-4000 - injectCallbacks needs the Java callback interface so get it 
                //                from the component type just in case the user has specified a
                //                WSDL interface and hence interfaze is WSDL
            	injectCallbacks(wrapper, (JavaInterface)service.getService().getInterfaceContract().getCallbackInterface());
            }
            
            final Object instance = wrapper.getInstance();

            // If the method couldn't be computed statically, or the instance being
            // invoked is a user-specified callback object that doesn't implement
            // the service interface from which the reflective method was obtained,
            // compute the method object dynamically for this invocation.
            Method imethod = method;
            if (imethod == null || !imethod.getDeclaringClass().isInstance(instance)) {
                try {
                    imethod = JavaInterfaceUtil.findMethod(instance.getClass(), operation);
                } catch (NoSuchMethodException e) {
                    throw new IllegalArgumentException("Callback object does not provide method " + e.getMessage());
                }
            }
            
            if (swapTCCL){
                AccessController.doPrivileged(new PrivilegedAction() {
                    public Object run() {
                        Thread.currentThread().setContextClassLoader(instance.getClass().getClassLoader());
                        return null;
                     }
                });
            }
            
            int argumentHolderCount = 0;

            // Holder pattern. Any payload parameters <T> which are should be in holders are placed in Holder<T>.
            // Only check Holder for remotable interfaces
            if (imethod != null && op.getInterface().isRemotable()) {
                Object[] payloadArray = (Object[])payload;
                List<Object> payloadList = new ArrayList<Object>();
                int nextIndex = 0;
                for (ParameterMode mode : op.getParameterModes()) {                    
                    if (mode.equals(ParameterMode.IN)) {
                        payloadList.add(payloadArray[nextIndex++]);
                    } else if (mode.equals(ParameterMode.INOUT)) {
                        // Promote array params from [<T>] to [Holder<T>]                  
                        Object item = payloadArray[nextIndex++];                           
                        Holder itemHolder = new Holder(item);
                        payloadList.add(itemHolder);
                        argumentHolderCount++;
                    } else {
                        // Create an empty Holder since we should not pass values for OUT parameters
                        payloadList.add(new Holder());
                        argumentHolderCount++;
                    }                        
                }
                
                // Maybe a bit odd to do but this way I don't have to worry about how the invoke if/else
                // immediately following might need to be changed.
                payload = payloadList.toArray();
            }

            Object ret;
            if (payload != null && !payload.getClass().isArray()) {
                ret = imethod.invoke(instance, payload);
            } else {
                ret = imethod.invoke(instance, (Object[])payload);
            }

            scopeContainer.returnWrapper(wrapper, contextId);
            
                        
            if (argumentHolderCount > 0) {
            	
                // Holder pattern. Any payload Holder<T> types are returned as part of the message body.
            	Object[] payloadArray = (Object[])payload;
            	
            	ArrayList<Object> holderOutputs = new ArrayList<Object>();
            	ArrayList<Object> result = new ArrayList<Object>();
                if (imethod != null) {                	
                    
                    for (int i = 0, size = op.getParameterModes().size(); i < size; i++) {                       
                        if (ParameterMode.IN != op.getParameterModes().get(i)) {                        	
                        	// Demote array params from Holder<T> to <T>.                                                   
                        	Holder<Object> item = (Holder<Object>)payloadArray[i];
                        	payloadArray[i] = item.value;
                        	holderOutputs.add(payloadArray[i]);                        	                      
                        }
                    }
                    
                    //
                    // Now we account for the fact that we may have a null because of a void return type,
                    // which is not part of the output DataType, and so should not be returned with the array
                    // of outputs, or we may have a null as value returned
                    // from a method with signature with return type other than void, which should be returned 
                    // in the output array.
                    // 
                    // The logic here is if we already have as many outputs in holders as we have outputs
                    // altogether, then we don't worry about the return value (which should be null).  Might
                    // be simpler to just check for void, but the code in the Java introspector has a lot
                    // of quirks for handling parameterized types, and this seems simpler for now.
                    //
                    int holderOutputSize = holderOutputs.size();
                    int numberOperationOutputs = op.getOutputType().getLogical().size();
                    if (holderOutputSize == numberOperationOutputs) {
                        if (ret != null) {
                            throw new IllegalStateException("Number of holder outputs equal to number of operations outputs." +
                                                            "\nNum = " + holderOutputSize + ", but non-null return value seen: " + ret);
                        }
                        result = holderOutputs;
                    } else if (holderOutputSize == numberOperationOutputs - 1) {
                        result.add(ret);
                        result.addAll(1, holderOutputs);
                    } else {
                        throw new IllegalStateException("Number of holder outputs seen: " + holderOutputSize +  
                                                        "\nNumber of operation outputs: " + numberOperationOutputs);
                    }
                }

                msg.setBody(result.toArray());

            } else {
                msg.setBody(ret);
            }
        } catch (InvocationTargetException e) {
            Throwable cause = e.getTargetException();
            boolean isChecked = false;
            for (DataType<?> d : operation.getFaultTypes()) {
                if (d.getPhysical().isInstance(cause)) {
                    isChecked = true;
                    msg.setFaultBody(cause);
                    break;
                }
            }
            if (!isChecked) {
                if (cause instanceof RuntimeException) {
                    throw (RuntimeException)cause;
                }
                if (cause instanceof Error) {
                    throw (Error)cause;
                } else {
                    throw new ServiceRuntimeException(cause.getMessage(), cause);
                }
            }            
                
        } catch (ObjectCreationException e) {
            throw new ServiceRuntimeException(e.getMessage(), e);
        } catch (Exception e) {
            msg.setFaultBody(e);           
        } finally {
            // reset the tccl if it was replaced above
            // with the contribution classloader
            if (swapTCCL){
                AccessController.doPrivileged(new PrivilegedAction() {
                    public Object run() {
                        Thread.currentThread().setContextClassLoader(tccl);
                        return null;
                     }
                });
            }
        }
        return msg;
    }