Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ /* * Reflection based RPCMessageReceiver , request will be processed by looking at the method signature * of the invocation method */ package org.apache.axis2.rpc.receivers; import org.apache.axiom.om.OMElement; import org.apache.axiom.om.OMNamespace; import org.apache.axiom.om.OMAbstractFactory; import org.apache.axiom.om.impl.builder.StAXOMBuilder; import org.apache.axiom.soap.SOAPEnvelope; import org.apache.axiom.soap.SOAPFactory; import org.apache.axis2.AxisFault; import org.apache.axis2.util.StreamWrapper; import org.apache.axis2.databinding.utils.BeanUtil; import org.apache.axis2.context.MessageContext; import org.apache.axis2.description.AxisMessage; import org.apache.axis2.description.AxisOperation; import org.apache.axis2.description.AxisService; import org.apache.axis2.description.Parameter; import org.apache.axis2.description.WSDL2Constants; import org.apache.axis2.description.java2wsdl.Java2WSDLConstants; import org.apache.axis2.description.java2wsdl.TypeTable; import org.apache.axis2.receivers.AbstractInOutMessageReceiver; import org.apache.axis2.wsdl.WSDLConstants; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import javax.xml.namespace.QName; import javax.xml.stream.XMLStreamReader; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; public class RPCMessageReceiver extends AbstractInOutMessageReceiver { private static Log log = LogFactory.getLog(RPCMessageReceiver.class); /** * reflect and get the Java method - for each i'th param in the java method - get the first * child's i'th child -if the elem has an xsi:type attr then find the deserializer for it - if * not found, lookup deser for th i'th param (java type) - error if not found - deserialize & * save in an object array - end for * <p/> * - invoke method and get the return value * <p/> * - look up serializer for return value based on the value and type * <p/> * - create response msg and add return value as grand child of <soap:body> * * @param inMessage incoming MessageContext * @param outMessage outgoing MessageContext * @throws AxisFault */ public void invokeBusinessLogic(MessageContext inMessage, MessageContext outMessage) throws AxisFault { Method method = null; try { // get the implementation class for the Web Service Object obj = getTheImplementationObject(inMessage); Class implClass = obj.getClass(); AxisOperation op = inMessage.getOperationContext().getAxisOperation(); method = (Method) (op.getParameterValue("myMethod")); // If the declaring class has changed, then the cached method is invalid, so we need to // reload it. This is to fix AXIS2-3947. if (method != null && method.getDeclaringClass() != implClass) { method = null; } AxisService service = inMessage.getAxisService(); OMElement methodElement = inMessage.getEnvelope().getBody().getFirstElement(); AxisMessage inAxisMessage = op.getMessage(WSDLConstants.MESSAGE_LABEL_IN_VALUE); String messageNameSpace = null; if (method == null) { String methodName = op.getName().getLocalPart(); Method[] methods = implClass.getMethods(); for (Method method1 : methods) { if (method1.isBridge()) { continue; } if (method1.getName().equals(methodName)) { method = method1; op.addParameter("myMethod", method); break; } } if (method == null) { throw new AxisFault("No such method '" + methodName + "' in class " + implClass.getName()); } } Object resObject = null; if (inAxisMessage != null) { resObject = RPCUtil.invokeServiceClass(inAxisMessage, method, obj, messageNameSpace, methodElement, inMessage); } SOAPFactory fac = getSOAPFactory(inMessage); // Handling the response AxisMessage outaxisMessage = op.getMessage(WSDLConstants.MESSAGE_LABEL_OUT_VALUE); if (outaxisMessage != null && outaxisMessage.getElementQName() != null) { messageNameSpace = outaxisMessage.getElementQName().getNamespaceURI(); } else { messageNameSpace = service.getTargetNamespace(); } OMNamespace ns = fac.createOMNamespace(messageNameSpace, service.getSchemaTargetNamespacePrefix()); SOAPEnvelope envelope = fac.getDefaultEnvelope(); OMElement bodyContent = null; if (WSDL2Constants.MEP_URI_ROBUST_IN_ONLY.equals(op.getMessageExchangePattern())) { OMElement bodyChild = fac.createOMElement(outMessage.getAxisMessage().getName(), ns); envelope.getBody().addChild(bodyChild); outMessage.setEnvelope(envelope); return; } Parameter generateBare = service.getParameter(Java2WSDLConstants.DOC_LIT_BARE_PARAMETER); if (generateBare != null && "true".equals(generateBare.getValue())) { RPCUtil.processResonseAsDocLitBare(resObject, service, envelope, fac, ns, bodyContent, outMessage); } else { RPCUtil.processResponseAsDocLitWrapped(resObject, service, method, envelope, fac, ns, bodyContent, outMessage); } outMessage.setEnvelope(envelope); } catch (InvocationTargetException e) { String msg = null; Throwable cause = e.getCause(); if (cause != null) { msg = cause.getMessage(); } if (msg == null) { msg = "Exception occurred while trying to invoke service method " + (method != null ? method.getName() : "null"); } if (cause instanceof AxisFault) { log.debug(msg, cause); throw (AxisFault) cause; } Class[] exceptionTypes = method.getExceptionTypes(); for (Class exceptionType : exceptionTypes) { if (exceptionType.getName().equals(cause.getClass().getName())) { // this is an bussiness logic exception so handle it properly String partQName = inMessage.getAxisService().getName() + getSimpleClassName(exceptionType); TypeTable typeTable = inMessage.getAxisService().getTypeTable(); QName elementQName = typeTable.getQNamefortheType(partQName); SOAPFactory fac = getSOAPFactory(inMessage); OMElement exceptionElement = fac.createOMElement(elementQName); if (exceptionType.getName().equals(Exception.class.getName())) { // this is an exception class. so create a element by hand and add the message OMElement innterExceptionElement = fac.createOMElement(elementQName); OMElement messageElement = fac.createOMElement("Message", inMessage.getAxisService().getTargetNamespace(), null); messageElement.setText(cause.getMessage()); innterExceptionElement.addChild(messageElement); exceptionElement.addChild(innterExceptionElement); } else { // if it is a normal bussiness exception we need to generate the schema assuming it is a pojo QName innerElementQName = new QName(elementQName.getNamespaceURI(), getSimpleClassName(exceptionType)); XMLStreamReader xr = BeanUtil.getPullParser(cause, innerElementQName, typeTable, true, false); StAXOMBuilder stAXOMBuilder = new StAXOMBuilder(OMAbstractFactory.getOMFactory(), new StreamWrapper(xr)); OMElement documentElement = stAXOMBuilder.getDocumentElement(); exceptionElement.addChild(documentElement); } AxisFault axisFault = new AxisFault(cause.getMessage()); axisFault.setDetail(exceptionElement); throw axisFault; } } log.error(msg, e); throw new AxisFault(msg, e); } catch (RuntimeException e) { log.error(e.getMessage(), e); throw AxisFault.makeFault(e); } catch (Exception e) { String msg = "Exception occurred while trying to invoke service method " + (method != null ? method.getName() : "null"); log.error(msg, e); throw AxisFault.makeFault(e); } } private String getSimpleClassName(Class type) { String simpleClassName = type.getName(); int idx = simpleClassName.lastIndexOf('.'); if (idx != -1 && idx < (simpleClassName.length() - 1)) { simpleClassName = simpleClassName.substring(idx + 1); } return simpleClassName.replace('$', '_'); } }