/* * 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. */ package org.apache.tuscany.sca.implementation.java.invocation; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.security.AccessController; import java.security.PrivilegedAction; import java.util.ArrayList; import java.util.List; import javax.xml.ws.Holder; import org.apache.tuscany.sca.assembly.EndpointReference; import org.apache.tuscany.sca.assembly.Service; import org.apache.tuscany.sca.core.factory.ObjectCreationException; import org.apache.tuscany.sca.core.invocation.Constants; import org.apache.tuscany.sca.core.scope.Scope; import org.apache.tuscany.sca.core.scope.ScopeContainer; import org.apache.tuscany.sca.core.scope.ScopedRuntimeComponent; import org.apache.tuscany.sca.implementation.java.JavaImplementation; import org.apache.tuscany.sca.implementation.java.context.ReflectiveInstanceWrapper; import org.apache.tuscany.sca.implementation.java.injection.Injector; import org.apache.tuscany.sca.implementation.java.introspect.JavaIntrospectionHelper; import org.apache.tuscany.sca.interfacedef.DataType; import org.apache.tuscany.sca.interfacedef.InterfaceContract; import org.apache.tuscany.sca.interfacedef.Operation; import org.apache.tuscany.sca.interfacedef.ParameterMode; import org.apache.tuscany.sca.interfacedef.java.JavaInterface; import org.apache.tuscany.sca.interfacedef.java.impl.JavaInterfaceUtil; import org.apache.tuscany.sca.invocation.DataExchangeSemantics; import org.apache.tuscany.sca.invocation.Invoker; import org.apache.tuscany.sca.invocation.Message; import org.apache.tuscany.sca.runtime.RuntimeComponent; import org.apache.tuscany.sca.runtime.RuntimeComponentService; import org.oasisopen.sca.ServiceReference; import org.oasisopen.sca.ServiceRuntimeException; /** * Responsible for synchronously dispatching an invocation to a Java component * implementation instance * * @version $Rev$ $Date$ */ public class JavaImplementationInvoker implements Invoker, DataExchangeSemantics { protected Operation operation; protected Method method; protected RuntimeComponentService service; protected boolean allowsPBR; @SuppressWarnings("unchecked") protected final ScopeContainer scopeContainer; private final InterfaceContract interfaze; public JavaImplementationInvoker(Operation operation, Method method, RuntimeComponent component, RuntimeComponentService service) { assert method != null : "Operation method cannot be null"; this.method = method; this.operation = operation; this.scopeContainer = ((ScopedRuntimeComponent)component).getScopeContainer(); this.allowsPBR = ((JavaImplementation)component.getImplementation()).isAllowsPassByReference(method); this.service = service; this.interfaze = service.getInterfaceContract(); } public JavaImplementationInvoker(Operation operation, RuntimeComponent component, RuntimeComponentService service) { // used if the method can't be computed statically in advance this.operation = operation; this.scopeContainer = ((ScopedRuntimeComponent)component).getScopeContainer(); this.service = service; this.interfaze = service.getInterfaceContract(); } @SuppressWarnings("unchecked") 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() { 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 which are should be in holders are placed in Holder. // Only check Holder for remotable interfaces if (imethod != null && op.getInterface().isRemotable()) { Object[] payloadArray = (Object[])payload; List payloadList = new ArrayList(); 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 [] to [Holder] 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 types are returned as part of the message body. Object[] payloadArray = (Object[])payload; ArrayList holderOutputs = new ArrayList(); ArrayList result = new ArrayList(); 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 to . Holder item = (Holder)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; } private void injectCallbacks(ReflectiveInstanceWrapper wrapper, JavaInterface callbackInterface) { for (Injector injector : wrapper.getCallbackInjectors()) { if (injector != null) { try { if (ServiceReference.class.isAssignableFrom(injector.getType())) { Class intf = JavaIntrospectionHelper.getBusinessInterface(injector.getType(), injector.getGenericType()); if ( intf.isAssignableFrom(callbackInterface.getJavaClass())) { injector.inject(wrapper.getInstance()); } } else if (injector.getType().isAssignableFrom(callbackInterface.getJavaClass())) { injector.inject(wrapper.getInstance()); } else { injector.injectNull(wrapper.getInstance()); } } catch (Exception e) { throw new ObjectCreationException("Exception invoking injector - " + e.getMessage(), e); } } } } @Override public boolean allowsPassByReference() { return allowsPBR; } }